Archive for the ‘Marginal Tax Rate’ Category

In some cases, politicians actually understand the economics of tax policy.

It’s quite common, for instance, to hear them urging higher taxes on tobacco because they want to discourage smoking.

I don’t think it’s their job to tell people how to live their lives, but I agree with their economic analysis. The more you tax something, the less you get of it.

One of my many frustrations is that those politicians then conveniently forget that lesson when it comes to taxing things that are good, such as work, saving, production, and investment.

And some countries are more punitive than others. There’s some new research from the European Policy Information Center, Timbro, and the Tax Foundation, that estimates the “effective marginal tax rate” for successful taxpayers for 41 major countries.

And they don’t simply look at the top income tax rates. They quite properly include other taxes that contribute to “deadweight loss” by driving a wedge between pre-tax income and post-tax consumption.

The political discussion around taxing high-earners usually revolves around the income tax, but in order to get a complete picture of the tax burden high-income earners face, it is important to consider effective marginal tax rates. The effective marginal tax rate answers the question, “If a worker gets a raise such that the total cost to the employer increases by one dollar, how much of that is appropriated by the government in the form of income tax, social security contributions, and consumption taxes?” …all taxes that affect the return to work should be taken into account. …Combining data mainly from international accounting firms, the OECD, and the European Commission, we are able to calculate marginal tax rates in the 41 members of the OECD and/or EU.

The main message of this research is that you don’t want to live in Sweden, where you only keep 24 percent of any additional income you produce.

And you should also avoid Slovenia, Belgium, Portugal, Finland, France, etc.

Congratulations to Bulgaria for being the anti-class warfare nation. That’s a smart strategy for a nation trying to recover from decades of communist deprivation.

American readers will be happy to see that the United States looks reasonably good, though New Zealand is the best of the rich nations, followed by Switzerland.

Speaking of which, we need a caveat for nations with federalist systems, such as the U.S., Switzerland, and Canada. In these cases, the top income tax rate is calculated by adding the central government’s top rate with the average top rate for sub-national governments.

So successful entrepreneurs in those countries actually have the ability to reduce their tax burdens if they make wise decisions on where to live (such as Texas or Florida in the case of the United States).

Let’s now shift to some economic analysis. The report makes (what should be) an obvious point that high tax rates have negative economic effects.

Countries should be cautious about placing excessive tax burdens on high-income earners, for several reasons. In the short run, high marginal tax rates induce tax avoidance and tax evasion, and can cause high-income earners to reduce their work effort or hours.

I would add another adverse consequence. Successful taxpayers can move.

That’s especially true in Europe, where cross-border tax migration is much easier than it is in the United States.

But even though there are odious exit taxes for people leaving the United States, we’ll see an exodus if we wind up with some of the crazy tax policies being advocated by Bernie Sanders and Elizabeth Warren.

P.S. Today’s column looks at how nations rank based on the taxation of labor income. For taxation of capital income, the rankings look quite different. For instance, because of pervasive double taxation, the United States gets poor scores for over-taxing dividends, capital gains, and businesses.

P.P.S. If you want to see tax rates on middle-income workers (though it omits value-added taxes), here is some OECD data.

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In addition to being a contest over expanding the burden of government spending, the Democratic primary also is a contest to see who wants the biggest tax increases.

Bernie Sanders and Elizabeth Warren have made class-warfare taxation an integral part of their campaigns, but even some of the supposedly reasonable Democrats are pushing big increases in tax rates.

James Pethokoukis of the American Enterprise Institute opines about the anti-growth effect of these proposed tax hikes, particularly with regard to entrepreneurship and successful new firms.

The Democratic presidential candidates have plenty of ideas about taxes. Wealth taxes. Wall Street taxes. Inequality taxes. And probably more to come. So lots of creative thinking about wealth redistribution. Wealth creation? Not so much. …one way to look at boosting GDP growth is thinking about specific policies to boost labor force and productivity growth. But there’s another way of approaching the issue: How many fast-growing growing new firms would need to be generated each year to lift the economy-wide growth rate each year by one percent? …a rough calculation by analyst Robert Litan figures there about 15 billion-dollar (in sales) companies formed every year. But what if the American entrepreneurial ecosystem were so vibrant that it produced 60 such companies annually? …The big point here is that the American private sector is key to growth. No other large economy is as proficient as the US in creating high-impact startups. But it doesn’t appear that the Democratic enthusiasm for big and bold tax plans is matched by concern about unwanted trade-offs.

If you want a substantive economic critique of class-warfare tax policy, Alan Reynolds has a must-read article on the topic.

He starts by explaining why it’s important to measure how sensitive taxpayers are (the “elasticity of taxable income”) to changes in tax rates.

Elasticity of taxable income estimates are simply a relatively new summary statistic used to illustrate observed behavioral responses to past variations in marginal tax rates. They do so by examining what happened to the amount of income reported on individual tax returns, in total and at different levels of income, before and after major tax changes. …For example, if a reduced marginal tax rate produces a substantial increase in the amount of taxable income reported to the IRS, the elasticity of taxable income is high. If not, the elasticity is low. ETI incorporates effects of tax avoidance as well as effects on incentives for productive activity such as work effort, research, new business start-ups, and investment in physical and human capital.

Alan then looks at some of the ETI estimates and what they imply for tax rates, though he notes that the revenue-maximizing rate is not the optimal rate.

Diamond and Saez claim that, if the relevant ETI is 0.25, then the revenue-maximizing top tax rate is 73 percent. Such estimates, however, do not refer to the top federal income tax rate, …but to the combined marginal rate on income, payrolls, and sales at the federal, state, and local level. …with empirically credible changes in parameters, the Diamond-Saez formula can more easily be used to show that top U.S. federal, state, and local tax rates are already too high rather than too low. By also incorporating dynamic effects — such as incentives to invest in human capital and new ideas — more recent models estimate that the long-term revenue-maximizing top tax rate is between 22 and 49 percent… Elasticity of taxable, or perhaps gross income…can be “a sufficient statistic to approximate the deadweight loss” from tax disincentives and distortions. Although recent studies define revenue-maximization as “optimal,” Goolsbee…rightly emphasizes, “The fact that efficiency costs rise with the square of the tax rate are likely to make the optimal rate well below the revenue-maximizing rate.”

These excerpts only scratch the surface.

Alan’s article extensively discusses how high-income taxpayers are especially sensitive to high tax rates, in part because they have considerable control over the timing, level, and composition of their income.

He also reviews the empirical evidence from major shifts in tax rates last century.

All told, his article is a devastating take-down of the left-of-center economists who have tried to justify extortionary tax rates. Simply stated, high tax rates hinder the economy, create deadweight loss, and don’t produce revenue windfalls.

That being said, I wonder whether his article will have any impact. As Kevin Williamson points out is a column for National Review, the left isn’t primarily motivated by a desire for more tax money.

Perhaps the strangest utterance of Barack Obama’s career in public office…was his 2008 claim that raising taxes on the wealthy is a moral imperative, even if the tax increase in question ended up reducing overall federal revenue. Which is to say, Obama argued that it did not matter whether a tax increase hurt the Treasury, so long as it also hurt, at least in theory and on paper, certain wealthy people. …ideally, you want a tax system with low transaction costs (meaning a low cost of compliance) and one that doesn’t distort a lot of economic activity. You want to get enough money to fund your government programs with as little disruption to life as possible. …Punitive taxes aren’t about the taxes — they’re about the punishment. That taxation should have been converted from a technical question into a moral crusade speaks to the basic failure of the progressive enterprise in the United States…the progressive demand for a Scandinavian welfare state at no cost to anybody they care about…ends up being a very difficult equation to balance, probably an impossible one. And when the numbers don’t work, there’s always cheap moralistic histrionics.

So what leads our friends on the left to pursue such misguided policies? What drives their support for punitive taxation?

Is is that they’re overflowing with compassion and concern for the poor?


Writing for the Federalist, Emily Ekins shares some in-depth polling data that discovers that envy is the real motive.

Supporters often contend their motivation is compassion for the dispossessed… In a new study, I examine…competing explanations and ask whether envy and resentment of the successful or compassion for the needy better explain support for socialism, raising taxes on the rich, redistribution, and the like. …Statistical tests reveal resentment of the successful has about twice the effect of compassion in predicting support for increasing top marginal tax rates, wealth redistribution, hostility to capitalism, and believing billionaires should not exist. …people who agree that “very successful people sometimes need to be brought down a peg or two even if they’ve done nothing wrong” were more likely to want to raise taxes on the rich than people who agree that “I suffer from others’ sorrows.” …I ran another series of statistical tests to investigate the motivations behind the following beliefs: 1) It’s immoral for our system to allow the creation of billionaires, 2) billionaires threaten democracy, and 3) the distribution of wealth in the United States is “unjust.” Again, the statistical tests find that resentment against successful people is more influential than compassion in predicting each of these three beliefs. In fact, not only is resentment more impactful, but compassionate people are significantly less likely to agree that it’s immoral for our system to allow people to become billionaires.

Here’s one of her charts, showing that resentment is far and away the biggest driver of support for class-warfare proposals.

These numbers are quite depressing.

They suggest that no amount of factual analysis or hard data will have any effect on the debate.

And there is polling data to back up Emily’s statistical analysis. Heck, some folks on the left openly assert that envy should be the basis for tax policy.

In other words, Deroy Murdock and Margaret Thatcher weren’t creating imaginary enemies.

P.S. If you think Kevin Williamson was somehow mischaracterizing or exaggerating Obama’s spiteful position on tax policy, just watch this video.

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The New York Times is going overboard with disingenuous columns.

A few days ago, I pointed out the many errors in David Leonhardt’s column extolling the wealth tax.

I also explained back in August how Steven Greenhouse butchered the data when he condemned the American economy.

And Paul Krugman is infamous for his creative writing.

But Mr. Leonhardt is on a roll. He has a new column promoting class warfare tax policy.

Almost a decade ago, Warren Buffett made a claim that would become famous. He said that he paid a lower tax rate than his secretary, thanks to the many loopholes and deductions that benefit the wealthy.oct-8-19-nyt …“Is it the norm?” the fact-checking outfit Politifact asked. “No.” Time for an update: It’s the norm now. …the 400 wealthiest Americans last year paid a lower total tax rate — spanning federal, state and local taxes — than any other income group, according to newly released data. …That’s a sharp change from the 1950s and 1960s, when the wealthy paid vastly higher tax rates than the middle class or poor.

Here’s the supposed proof for Leonhardt’s claim, which is based on a new book from two professors at the University of California at Berkeley, Emmanuel Saez and Gabriel Zucman.

Here are the tax rates from 1950.


And here are the tax rates from last year, showing the combined effect of the Kennedy tax cut, the Reagan tax cuts, the Bush tax cuts, and the Trump tax cut (as well as the Nixon tax increase, the Clinton tax increase, and the Obama tax increase).


So is Leonhardt (channeling Saez and Zucman) correct?

Are these charts evidence of a horrid and unfair system?

Nope, not in the slightest.

But this data is evidence of dodgy analysis by Leonhardt and the people he cites.

First and foremost, the charts conveniently omit the fact that dividends and capital gains earned by high-income taxpayers also are subject to the corporate income tax.

Even the left-leaning Organization for Economic Cooperation and Development acknowledges that both layers of tax should be included when measuring the effective tax rate on households.

Indeed, this is why Warren Buffett was grossly wrong when claiming he paid a lower tax rate than his secretary.

But there’s also another big problem. There’s a huge difference between high tax rates and high tax revenues.

feb-4-19-perrySimply stated, the rich didn’t pay a lot of tax when rates were extortionary because they can choose not to earn and declare much income.

Indeed, there were only eight taxpayers in 1960 who paid the top tax rates of 91 percent.

Today, by contrast, upper-income taxpayers are paying an overwhelming share of the tax burden.

It’s especially worth noting that tax collections from the rich skyrocketed when Reagan slashed the top tax rate in the 1980s.

Let’s close by pointing out that Saez and Zucman are promoting a very radical tax agenda.

Saez and Zucman sketch out a modern progressive tax code. The overall tax rate on the richest 1 percent would roughly double, to about 60 percent. The tax increases would bring in about $750 billion a year, or 4 percent of G.D.P…. One crucial part of the agenda is a minimum global corporate tax of at least 25 percent. …Saez and Zucman also favor a wealth tax

Punitive income tax rates, higher corporate tax rates, and a confiscatory wealth tax.

Does anybody think copying France is a recipe for success?

P.S. I pointed out that Zucman and Saez make some untenable assumptions when trying to justify how a wealth tax won’t hurt the economy.

P.P.S. It’s also worth remembering that the income of rich taxpayers will be subject to the death tax as well, which means Leonhardt’s charts are doubly misleading.

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At the risk of over-simplifying, the difference between “supply-side economics” and “demand-side economics” is that the former is based on microeconomics (incentives, price theory) while the latter is based on macroeconomics (aggregate demand, Keynesianism).

When discussing the incentive-driven supply-side approach, I often focus on two key points.

  • Marginal tax rates matter more than average tax rates because the incentive to earn additional income (rather than enjoying leisure) is determined by whether the government grabs a small, medium, or large share of any extra earnings.
  • Some taxpayers such as investors, entrepreneurs, and business owners are especially sensitive to changes in marginal tax rates because they have considerable control over the timing, level, and composition of their income.

Today, let’s review some new research from Spain’s central bank confirms these supply-side insights.

Here’s what the authors investigated.

The impact of personal income taxes on the economic decisions of individuals is a key empirical question with important implications for the optimal design of tax policy. …the modern public finance literature has devoted significant efforts to study behavioral responses to changes in taxes on reported taxable income… Most of this work focuses on the elasticity of taxable income (ETI), which captures a broad set of real and reporting behavioral responses to taxation. Indeed, reported taxable income reflects not only individuals’ decisions on hours worked, but also work effort and career choices as well as the results of investment and entrepreneurship activities. Besides these real responses, the ETI also captures tax evasion and avoidance decisions of individuals to reduce their tax bill.

By the way, “elasticity” is econ-speak for sensitivity. In other words, if there’s high elasticity, it means taxpayers are very responsive to a change in tax rates.

Anyhow, here’s how authors designed their study.

In this paper, we estimate the elasticity of taxable income in Spain, an interesting country to study because during the last two decades it has implemented several major personal income tax reforms… In the empirical analysis, we use an administrative panel dataset of income tax returns… We calculate the MTR as a weighted average of the MTR applicable to each income source (labor, financial capital, real-estate capital, business income and capital gains).

You can see in Figure 1 that the 2003 reform was good for taxpayers and the 2012 reform was bad for taxpayers.

If nothing else, though, these changes created the opportunity for scholars to measure how taxpayers respond.

And here are the results.

We obtain estimates of the ETI around 0.35 using the Gruberand Saez (2002) estimation method, 0.54 using Kleven and Schultz (2014)’s method and 0.64 using Weber (2014)’s method. …In addition to the average estimates of the ETI, we analyze heterogeneous responses across groups of taxpayers and sources of income. …As expected, stronger responses are documented for groups of taxpayers with higher ability to respond. In particular, self-employed taxpayers have a higher ETI than wage employees, while real-estate capital and business income respond more strongly than labor income. …we find large responses on the tax deductions margin, especially private pension contributions.

In other words, taxpayers do respond to changes in tax policy.

And some taxpayers are very sensitive (high elasticity) to those changes.

Here’s Table 6 from the study. Much of it will be incomprehensible if you’re not familiar with econometrics. But all that matters is that I circled (in red) the measures of how elasticities vary based on the type of income (larger numbers mean more sensitive).

I’ll close with a very relevant observation about American fiscal policy.

Currently, upper-income taxpayers finance the vast majority of America’s medium-sized welfare state.

But what if the United States had a large-sized welfare state, like the ones that burden many European nations?

If you review the data, those large-sized welfare states are financed with stifling tax burdens on lower-income and middle-class taxpayers. Politicians in Europe learned that they couldn’t squeeze enough money out of the rich (in large part because of high elasticities).

Indeed, I wrote early this year about how taxes are confiscating the lion’s share of the income earned by ordinary workers in Spain.

And if we adopt the expanded welfare state envisioned by Bernie Sanders, Alexandria Ocasio-Cortez, and Kamala Harris, the same thing will happen to American workers.

P.S. I admire how Spanish taxpayers have figured out ways of escaping the tax net.

P.P.S. There’s also evidence about the impact of Spain’s corporate tax.

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Assuming the goal is faster growth and higher living standards, there are three core principles of good tax policy.

You could call this list the Holy Trinity of supply-side economics. Simply stated, incentives matter, so it makes no sense for government to discourage the things that make a nation more prosperous.

Regarding low marginal tax rates, my left-leaning friends sometimes dismiss the importance of this principle by pointing out that they don’t pay much attention to their marginal tax rates.

I can sympathize with their skepticism. When I was first learning about public finance and studying supply-and-demand curves showing deadweight loss, I also wondered about the supply-side claim that marginal tax rates mattered. Even after I started working, I had doubts. Would I somehow work harder if my tax rate fell? Or goof off if my tax rate went up? It didn’t make much sense.

What I didn’t recognize, however, is that I was looking at the issue from the perspective of someone working a standard, 9-to-5 job with a modest income. And it is true that such workers are not very responsive (especially in the short run) to changes in tax rates.

In the real world, though, there are lots of people who don’t fit that profile. They have jobs that give them substantial control over the timing, level, and composition of their income.

And these people – such as business owners, professionals, second earners, investors, and entrepreneurs – often are very responsive to changes in marginal tax rates.

We have a new example of this phenomenon. Check out these excerpts from a story in the U.K.-based Times.

About three quarters of GPs and hospital consultants have cut or are planning to cut their hours… About 42 per cent of family doctors and 30 per cent of consultants have reduced their working times already, claiming that they are being financially penalised the more they work. A further 34 per cent and 40 per cent respectively have confirmed that they plan to reduce their hours in the coming months… The government has launched an urgent consultation over the issue, which is the result of changes to pension rules limiting the amount that those earning £110,000 or more can pay into their pensions before they are hit with a large tax bill.

In other words, high tax rates have made leisure more attractive than work. Why work long hours, after all, if the tax authority is the biggest beneficiary?

There are also indirect victims of these high tax rates.

Last month figures from NHS Providers, which represents hospitals, showed that waiting lists had climbed by up to 50 per cent since April as doctors stopped taking on extra shifts to avoid the financial penalties. Richard Vautrey, chairman of the BMA GPs’ committee, said: “These results show the extent to which GPs are being forced to reduce their hours or indeed leave the profession altogether because of pension taxes. …swift and decisive action is needed from the government to end this shambolic situation and to limit the damage that a punitive pensions taxation system is inflicting on doctors, their patients and across the NHS as a whole.”

The U.K.’s government-run health system already has plenty of problems, including long wait times and denial of care. The last thing it needs is for doctors and other professionals to cut back their hours because politicians are too greedy.

The moral of the story is that tax rates matter. Depending on the type of person, they can matter a lot.

This doesn’t mean tax rates need to be zero (though I like that idea).

It simply means that taxes impose costs, and those costs become increasingly apparent as tax rates climb.

P.S. If you want a horror story about marginal tax rates, check out what happened to Cam Newton, the quarterback of the Carolina Panthers.

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I’m not a big fan of the current tax system. I’m also not supportive of America’s bankrupt Social Security system.

The country would be much better off with fundamental reform of both the tax system and Social Security.

Some groups will be reap especially large rewards if that happens.

For instance, a new report from the National Bureau of Economic Research examines the impact of taxes and Social Security on female labor supply.

…we ask to what extent the fact that taxes and old age Social Security benefits depend on one’s marital status discourages female labor supply and affect welfare. …as couples file taxes jointly, the secondary earner in the married couple faces a higher marginal tax rate, which tends to discourage their labor supply. …reduced labor supply does not necessarily imply lower Social Security benefits. Since women have historically been the secondary earners, both provisions tend to discourage female labor supply… to what extent are these disincentives holding it back? …We estimate our dynamic structural model using…data from the Panel Study of Income Dynamics (PSID) and from the Health and Retirement Study (HRS) for the cohort born in 1941-1945 (the “1945” cohort). …we also estimate our model for the 1951-1955 cohort (the “1955” cohort),

This chart from the study shows that married women face a tax penalty – i.e., higher marginal tax rates – compared to single women.

The main takeaway is that this marriage penalty, combined with discriminatory features of Social Security, discourages women from working.

How big is the effect?

The report, authored by Margherita Borella, Mariacristina De Nardi, and Fang Yang, finds that government policies have a significant adverse impact on labor-force participation.

For the 1945 cohort, we find that Social Security spousal and survivor benefits and the current structure of joint income taxation provide strong disincentives to work to married women and single women who expect to get married… For instance, the elimination of all of these marriage-based rules raises participation at age 25 by over 20 percentage points for married women and by five percentage points for single women. At age 45, participation for these groups is, respectively, still 15 and 3 percentage point higher without these marital benefits provisions. In addition, these marriage-based rules reduce the participation of married men starting at age 55, resulting in a participation that is 8 percentage points lower by age 65. Finally, for these cohorts, these marital provisions decrease the savings of married couples by 20.3% at age 66.1 In terms of welfare, abolishing these marital provisions would benefit…over ninety percent of the people in this cohort. …We find that the effects for the 1955 cohort on participation, wages, earnings, and savings are large and similar to those in the 1945 cohort, thus indicating that the effects of marriage-related provisions are large also for cohorts in which the labor participation of married women is higher.

What if these discriminatory policies were fixed?

It depends, of course, on how the problems are addressed.

The report finds that a budget-neutral approach (i.e., returning any budgetary windfall to taxpayers) would be a significant net plus.

…there would also be large aggregate gains from removing marriage related provisions and reducing the income tax… Overall our policy experiments thus indicate that removing marriage related taxes and Social Security benefits would increase female labor supply and the welfare of the majority of the populations.

Here are a couple of charts from the study, showing both an increase in labor supply and an increase in labor income.

I’ll close with a final point about family structure.

Some people will argue that the current penalties in the tax code and Social Security system are desirable because they don’t punish stay-at-home moms as much as working women.

That’s a very strange argument. Sort of like the folks on the left, including the IMF, who advocate policies that hurt the poor if rich people suffer even more.

P.S. If there’s reform, older people also will enjoy significant gains.

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A couple of weeks ago, I used a story about a local tax issue in Washington, DC, to make an important point about how new tax increases cause more damage than previous tax increases because “deadweight losses” increase geometrically rather than arithmetically.

Simply stated, if a tax of X does Y amount of damage, then a tax of 2X will do a lot more damage than 2Y.

This is the core economic reason why even left-leaning international bureaucracies agree that class-warfare taxes are so destructive. When you take a high tax rate and make it even higher, the damage grows exponentially.

As such, I was very interested to see a new study on this topic from the World Bank. It starts by noting that higher tax rates are the wrong way to address fiscal shortfalls.

…studies have used the narrative approach for individual or multi-country analyses (in all cases, focusing solely on industrial economies, and mostly on industrial European countries). These studies find large negative tax multipliers, ranging between 2 and 5. This recent consensus pointing to large negative tax multipliers, especially in industrial European countries, naturally entails important policy prescriptions. For example, as part of a more comprehensive series of papers focusing on spending and tax multipliers, Alesina, Favero, and Giavazzi (2015) point that policies based upon spending cuts are much less costly in terms of short run output losses than tax based adjustments.

The four authors used data on value-added taxes to investigate whether higher tax rates did more damage or less damage in developing nations.

A natural question is whether large negative tax multipliers are a robust empirical regularity… In order to answer this highly relevant academic and policy question, one would ideally need to conduct a study using a more global sample including industrial and, particularly, developing countries. …This paper takes on this challenge by focusing on 51 countries (21 industrial and 30 developing) for the period 1970-2014. …we focus our efforts on building a new series for quarterly standard value-added tax rates (henceforth VAT rates). …We identify a total of 96 VAT rate changes in 35 countries (18 industrial and 17 developing).

The economists found that VAT increases did the most damage in developing nations.

…when splitting the sample into industrial European economies and the rest of countries, we find tax multipliers of 3:6 and 1:2, respectively. While the tax multiplier in industrial European economies is quite negative and statistically significant (in line with recent studies), it is about 3 times smaller (in absolute value) and borderline statistically significant for the rest of countries.

Here’s a chart showing the comparison.

Now here’s the part that merits close attention.

The study confirms that the deadweight loss of VAT hikes is higher in developed nations because the initial tax burden is higher.

Based on different types of macroeconomic models (which in turn rely on different mechanisms), the output effect of tax changes is expected to be small at low initial levels of taxation but exponentially larger when initial tax levels are high. Therefore, the distortions and disincentives imposed by taxation on economic activity are directly, and non-linearly, related to the level of tax rates. By the same token, for a given level of initial tax rates, larger tax rate changes have larger tax multipliers. …In line with theoretical distortionary and disincentive-based arguments, we find, using our novel worldwide narrative, that the effect of tax changes on output is indeed highly non-linear. Our empirical findings show that the tax multiplier is essentially zero under relatively low/moderate initial tax rate levels and more negative as the initial tax rate and the size of the change in the tax rate increase. …This evidence strongly supports distortionary and disincentive-based arguments regarding a nonlinear effect of tax rate changes on economic activity…the economy will inevitably suffer when taxes are increased at higher initial tax rate levels.

What makes these finding especially powerful is that value-added taxes are less destructive than income taxes on a per-dollar-raised basis.

So if taking a high VAT rate and making it even higher causes a disproportionate amount of economic damage, then imagine how destructive it is to increase top income tax rates.

P.S. The fact that a VAT is less destructive than an income tax is definitely not an argument for enacting a VAT. That would be akin to arguing that it would be fun to break your wrist because that wouldn’t hurt as much as the broken leg you already have.

I’ve even dealt with people who actually argue that a VAT isn’t economically destructive because it imposes the same tax on current consumption and future consumption. I agree with them that it is a good idea to avoid double taxation of saving and investment, but that doesn’t change the fact that a VAT increases the wedge between pre-tax income and post-tax consumption.

And that means less incentive to earn income in the first place.

Which is confirmed by the study.

Panels A and B in Figure 18 show the relationship between the VAT rate a and the perceived effect of taxes on incentives to work and invest, respectively, for a sample of 123 countries for the year 2014. Supporting our previous findings, the relationship is highly non-linear. While the perceived effect of taxes on the incentives to work and invest barely changes as VAT rates increase at low/moderate levels (approximately until the VAT rate reaches 14 percent), it falls rapidly for high levels of VAT rates.

Here’s the relevant chart from the report.

The moral of the story is that all tax increases are misguided, but class-warfare taxes wreak the most economic havoc.

P.S. Not everyone understands this common-sense observation. For instance, the bureaucrats at the Congressional Budget Office basically argued back in 2010 that a 100 percent tax rate was the way to maximize growth.

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