The idea that tax cuts increase tax revenues is a highly debated and controversial topic in economics. While a short-term boost in revenues can sometimes occur under specific conditions, most evidence and economic consensus show that large, unpaid-for tax cuts reduce total government revenue in the long run.
The concept is a central pillar of "supply-side economics," sometimes referred to as "trickle-down economics".
The Laffer Curve: The theoretical argument
The claim is rooted in the Laffer Curve, a bell-shaped theory popularized by economist Arthur Laffer in the 1970s.
- It suggests that at a 0% tax rate, the government collects no revenue. At a 100% tax rate, the government also collects no revenue, as there is no incentive to work.
- The curve posits a theoretical "sweet spot" at an intermediate tax rate where government revenue is maximized.
- Following this logic, if tax rates are currently on the high, downward-sloping side of the curve, a tax cut would theoretically move the rate closer to the optimal point, increasing economic activity and ultimately boosting tax receipts.
Why the theory is rarely observed in practice
The idea that tax cuts will pay for themselves by stimulating enough economic growth to offset the lower rates has not generally been borne out by recent experience in the U.S..
- Behavioral effects are small: Economic analysis has shown that the effect of tax cuts on individual behavior, such as increased work or investment, is generally modest and not enough to overcome the initial revenue loss.
- Crowding out: Unpaid-for tax cuts increase budget deficits, which can be financed through borrowing. This increases the demand for capital and can lead to higher interest rates, which "crowds out" private investment and harms long-run economic growth.
- Uncertain peak: The Laffer Curve's optimal tax rate is theoretical, and no one can know with certainty what that rate is. Most economists believe U.S. tax rates are not on the high side of the curve, meaning rate reductions would not significantly increase revenue.
The case of the 2017 Tax Cuts and Jobs Act (TCJA)
The TCJA provides a recent, real-world example of how tax cuts have impacted government revenue.
- Significant revenue reduction: The TCJA was projected to significantly reduce federal revenue, and this has occurred. By 2019, federal revenues were $545 billion (7.4%) lower than pre-TCJA projections.
- Corporate tax revenue decline: The corporate tax rate was lowered from 35% to 21%. In 2018, corporate tax revenue was nearly 40% lower than projected before the law was passed.
- Temporary provisions distort the picture: Some proponents of the TCJA point to periods where revenues have increased. However, these increases were often driven by temporary factors, like the post-pandemic economic recovery, and do not show a sustained reversal of revenue trends.
Conclusion
Tax cuts do not reliably increase government tax revenues. While the theoretical Laffer Curve is an influential model in economic discourse, historical evidence suggests that major tax cuts, particularly those that increase deficits, typically reduce total government revenue in the long run.
- Exploring the Laffer Curve: Tax Rates and Revenue Explained
Aug 8, 2025 — What Is the Laffer Curve? The Laffer Curve showcases the intricate relationship between tax rates and government revenue, a concept popularized by economist Art...
Investopedia
- Supply Side Economics - NYU Stern
Consider the evidence on each of these two effects. * 1. The labor supply effect: 1.1. The maximum income tax bracket was reduced from 91% to 70% during the Ken...
NYU Stern
- Supply-Side Economics: What You Need to Know - Investopedia
Nov 18, 2024 — What Is Supply-Side Economics? The theory of supply-side economics maintains that increasing the supply of goods and services is the engine of economic growth. ...
The idea that tax cuts increase tax revenues is a highly debated and controversial topic in economics. While a short-term boost in revenues can sometimes occur under specific conditions, most evidence and economic consensus show that large, unpaid-for tax cuts reduce total government revenue in the long run.
The concept is a central pillar of "supply-side economics," sometimes referred to as "trickle-down economics".
The Laffer Curve: The theoretical argument
The claim is rooted in the Laffer Curve, a bell-shaped theory popularized by economist Arthur Laffer in the 1970s.
- It suggests that at a 0% tax rate, the government collects no revenue. At a 100% tax rate, the government also collects no revenue, as there is no incentive to work.
- The curve posits a theoretical "sweet spot" at an intermediate tax rate where government revenue is maximized.
- Following this logic, if tax rates are currently on the high, downward-sloping side of the curve, a tax cut would theoretically move the rate closer to the optimal point, increasing economic activity and ultimately boosting tax receipts.
Why the theory is rarely observed in practice
The idea that tax cuts will pay for themselves by stimulating enough economic growth to offset the lower rates has not generally been borne out by recent experience in the U.S..
- Behavioral effects are small: Economic analysis has shown that the effect of tax cuts on individual behavior, such as increased work or investment, is generally modest and not enough to overcome the initial revenue loss.
- Crowding out: Unpaid-for tax cuts increase budget deficits, which can be financed through borrowing. This increases the demand for capital and can lead to higher interest rates, which "crowds out" private investment and harms long-run economic growth.
- Uncertain peak: The Laffer Curve's optimal tax rate is theoretical, and no one can know with certainty what that rate is. Most economists believe U.S. tax rates are not on the high side of the curve, meaning rate reductions would not significantly increase revenue.
The case of the 2017 Tax Cuts and Jobs Act (TCJA)
The TCJA provides a recent, real-world example of how tax cuts have impacted government revenue.
- Significant revenue reduction: The TCJA was projected to significantly reduce federal revenue, and this has occurred. By 2019, federal revenues were $545 billion (7.4%) lower than pre-TCJA projections.
- Corporate tax revenue decline: The corporate tax rate was lowered from 35% to 21%. In 2018, corporate tax revenue was nearly 40% lower than projected before the law was passed.
- Temporary provisions distort the picture: Some proponents of the TCJA point to periods where revenues have increased. However, these increases were often driven by temporary factors, like the post-pandemic economic recovery, and do not show a sustained reversal of revenue trends.
Conclusion
Tax cuts do not reliably increase government tax revenues. While the theoretical Laffer Curve is an influential model in economic discourse, historical evidence suggests that major tax cuts, particularly those that increase deficits, typically reduce total government revenue in the long run.
- Exploring the Laffer Curve: Tax Rates and Revenue Explained
Aug 8, 2025 — What Is the Laffer Curve? The Laffer Curve showcases the intricate relationship between tax rates and government revenue, a concept popularized by economist Art...
Investopedia
- Supply Side Economics - NYU Stern
Consider the evidence on each of these two effects. * 1. The labor supply effect: 1.1. The maximum income tax bracket was reduced from 91% to 70% during the Ken...
NYU Stern
- Supply-Side Economics: What You Need to Know - Investopedia
Nov 18, 2024 — What Is Supply-Side Economics? The theory of supply-side economics maintains that increasing the supply of goods and services is the engine of economic growth. ...