Taxation in Macroeconomics

Primary Purpose of Taxes

Taxes are a fundamental tool for governments to fund public goods and services, and to influence economic activity.

• Public Services: Taxes provide funding for education, public safety, infrastructure, and other services that benefit society as a whole.

• Main Purpose: The main purpose of taxes is to fund public goods and services that benefit society as a whole.

How Taxes Create Market Inefficiencies

Taxes can distort market outcomes by affecting prices and quantities exchanged.

• Equilibrium Quantity: Taxes reduce the equilibrium quantity exchanged in a market.

• Important Explanation: Taxes increase prices buyers pay and decrease prices sellers receive, reducing the quantity traded below the efficient market equilibrium.

Impact on Market Equilibrium When a Tax is Imposed

• Price: Price increases for buyers and decreases for sellers.

• Quantity: Quantity exchanged decreases.

Sources of Government Funding

Governments fund their activities through several sources:

• Fees: Fees for government services or user charges.

• Taxes: Compulsory payments by individuals and businesses.

• Borrowing: Issuing government bonds or taking loans.

Government Budget Constraint

The government budget constraint limits spending and transfer payments to the amount that can be funded by taxes.

• Every dollar spent by the government must be funded by taxes or borrowing.

Tax Base and Tax Rate

• Tax Base: The value of goods, services, wealth, or incomes subject to taxation.

• Tax Rate: The proportion of a tax base that must be paid to the government as taxes.

Marginal and Average Tax Rates

• Marginal Tax Rate: The change in tax payment divided by the change in income.

• Average Tax Rate: The total tax payment divided by total income.

Types of Taxation Systems

• Proportional Taxation: All income levels pay the same percentage of their income as taxes.

• Progressive Taxation: As income increases, a higher percentage of additional income is paid as taxes.

• Regressive Taxation: As income increases, a lower percentage of income is paid as taxes.

Federal Taxes and Their Importance

Federal Personal Income Tax

• Accounts for 50% of all federal revenue.

• All U.S. citizens, resident aliens, and most others (including those earning income abroad) are required to pay this tax.

• Tax paid rises as income increases.

Capital Gains and Losses

• Capital Gain: Positive difference between the purchase price and sale price of an asset. Example: Buy a share for $5, sell for $15, capital gain is $10.

• Capital Loss: Negative difference between purchase and sale price of an asset.

Corporate Income Tax

• Accounts for 7% of federal tax revenue.

• Applied to the income of corporations.

• Corporations are taxed on the difference between total revenues and expenses.

Tax Incidence

Tax incidence refers to the distribution of tax burdens among various groups in society.

• Consumers, stockholders, and employees may all bear part of the tax burden.

• Who pays the corporate income tax? Ultimately, people (consumers, workers, stockholders) pay all taxes.

Elasticity and Tax Incidence

• If demand is more elastic than supply, producers bear a larger share of the tax burden.

Social Security and Unemployment Insurance Taxes

• Social Security Taxes: Imposed on earnings up to about $176,100. Contributions are 6.2% for employers and 6.2% for employees.

• Unemployment Insurance Taxes: Paid by employers. The rate is 0.9% on the first $7,000 of wages per employee per year. States may levy additional taxes up to 3% based on employer record.

Tax Rates and Tax Revenues

States and Local Governments

• Taxes imposed on goods and services yield more revenue than income taxes.

• Key issue: How to set tax rates to extract the largest possible payments.

Ad Valorem Taxation

• Tax rate is equal to a fraction of the market price of each unit purchased.

Evaluating Tax Rate Changes

There are two main approaches to evaluating how changes in tax rates affect government tax collections:

• Static Tax Analysis: Assumes changes in tax rates leave the tax base unaffected.

• Dynamic Tax Analysis: Recognizes that higher tax rates may shrink the tax base; tax revenues may eventually decline if the tax rate is raised sufficiently.

Maximizing Tax Revenues

• Dynamic tax analysis predicts that ever-higher tax rates bring about declines in the tax base.

• At sufficiently high rates, government tax revenues begin to fall off.

Taxation from the Point of View of Producers and Consumers

Excise Tax

• A tax levied on purchases of a particular good or service.

Effects of Taxes on Demand and Supply Curves

Tax Imposed on Buyers

• Shifts the demand curve to the left by the amount of the tax.

• Buyers are less willing to purchase goods at every price, causing a decrease in demand.

Tax Imposed on Sellers

• Shifts the supply curve to the left (upward) by the amount of the tax.

• Sellers require a higher price to supply the same quantity.

Market Equilibrium Effects

• Reduction in Equilibrium Quantity: Imposing a tax reduces the equilibrium quantity exchanged.

• Price Effects: Price paid by buyers increases, price received by sellers decreases.

Unit Tax

• A constant tax assessed on each unit of a good that consumers purchase.

• Applied to each unit exchanged in a market transaction.

• Excise taxes on gasoline are examples.

• Shifts the supply curve up and left by the amount of the unit tax.

• Equilibrium price of gasoline rises, equilibrium quantity declines.

Who Pays the Tax?

• Consumers pay part of the excise tax, producers absorb the remainder.

• Example: If the price paid by consumers is $10 and the tax is $3 per unit, the price received by suppliers is $7 ($10 - $3).

Summary Table: Types of Taxation

Summary Table: Tax Incidence Distribution

Key Formulas

Additional info: Some explanations and examples have been expanded for clarity and completeness.