Payroll Tax vs Capital Gains Tax
Payroll Tax and Capital Gains Tax are two Public Finance & Taxation concepts in AP Economics that students often mix up. A payroll tax is a tax on wages and salaries, usually split between employer and employee, that funds social insurance programs. A capital gains tax is a tax on the profit from selling an asset for more than you paid, owed only when the gain is realized through a sale. Here is how they compare side by side.
A payroll tax applies to earnings from work rather than to all income, so wages are taxed but interest, dividends and capital gains are not. The statutory burden is often split, with half withheld from the worker's check and half paid by the employer, but because labor supply is relatively inelastic, workers bear most of the true burden either way. Many payroll taxes apply only up to an annual earnings cap, so a worker earning far above the cap pays the same dollar amount as one right at it and therefore a smaller share of total income. That cap is why the payroll tax is regressive at the top, while an income tax with rising marginal rates is progressive.
A capital gain is the sale price of an asset minus its purchase price, or basis, and the tax applies to that difference rather than to the whole sale price. Gains are normally taxed only when realized, so an investor who holds an appreciating asset owes nothing until she sells; that delay is valuable because untaxed money keeps compounding. Many systems tax long-held assets at a lower rate than wages, on the argument that the gain partly reflects inflation and that the underlying corporate profits were already taxed once. Critics reply that the gap rewards income from wealth over income from work. A capital gain is not the same as dividend income, which is a payout from ongoing profits rather than a change in the asset's price.
Payroll Tax vs Capital Gains Tax: Taxing Work and Taxing Ownership
| Payroll Tax | Capital Gains Tax | |
|---|---|---|
| What is taxed | Wages and salaries, as they are earned | The realized gain when an asset sells for more than it cost |
| When it is owed | Every pay period, before the wage reaches the worker | Only on sale, so an asset that rises in value but is held is untaxed |
| Who hands the money over | The employer, who withholds the worker's share and adds its own | The seller, who reports the sale on a return |
| Who bears it in economic terms | Mostly the worker, since labour supply responds weakly to the wage | The owner, who at least picks the year the bill falls due |
| Ceiling on the base | Often, for part of the tax, so wages above a threshold escape it | None on the size of a gain, though losses can usually offset gains |
| Effect on behaviour | Raises the cost of employing someone and lowers take-home pay | Encourages holding assets longer, since selling is what triggers the bill |
| Effect on measured progressivity | Regressive above any wage ceiling, and wages are a smaller share of high incomes | Concentrated on asset owners, though a lower rate on gains than on wages cuts their average rate |
A ceiling on the wage base is what makes a payroll tax regressive at the top
Payroll taxes are usually flat on the wage, which sounds neutral until you notice two things. Many systems stop taxing wages above a ceiling, and high incomes contain less wage in the first place. Use illustrative numbers. Suppose the employee share is 6 percent of wages up to a ceiling of 100,000. A worker earning 60,000 pays 6 percent of 60,000, which is 3,600, and the employer matches it with another 3,600. A worker earning 200,000 pays 6 percent of the first 100,000, which is 6,000, and nothing on the rest. Compare the average rates. The first worker pays 3,600 out of 60,000, or 6 percent. The second pays 6,000 out of 200,000, or 3 percent. The rate falls as income rises, which is what regressive means. That result comes from the ceiling alone, before allowing for the fact that a higher earner is more likely to have income that is not a wage at all and therefore never meets this tax. No figure here is a real rate or a real ceiling; all of them are illustrative. Work out your own at /calculate/effective-tax-rate.
A gain is not taxed until you sell, and that timing is the whole difference
The capital gains tax has a feature the payroll tax cannot have. The taxpayer chooses when it falls due. Suppose an illustrative investor buys shares for 40,000 and they are worth 100,000 some years later. On paper the gain is 60,000, and nothing is owed. Sell, and the gain is realized, so at an illustrative rate of 15 percent the bill is 9,000. Hold instead, and the whole 60,000 keeps compounding, including the 9,000 that would otherwise have gone to the government. Two consequences follow. The first is lock-in. An investor may keep an asset they would rather be rid of, because selling triggers the tax, so capital sits where it is instead of moving to a better use. The second is that deferral is worth money by itself, since a tax paid later costs less in present value than the same tax paid now. Neither effect exists for a payroll tax, which is withheld the moment a wage is earned, with no choice about timing and no way to postpone it. This is one reason wage income and asset income can face very different burdens even when the stated rates look similar. See /glossary/average-tax-rate for the measure that shows it.
Frequently asked questions
What is the difference between payroll tax and capital gains tax?
A payroll tax is charged on wages as they are earned and is withheld by the employer, while a capital gains tax is charged on the profit from selling an asset and is paid by the seller after the sale. One is continuous and automatic for anyone with a job, and the other is triggered only when an owner decides to sell.
Why is the payroll tax called regressive?
Because where a ceiling applies, wages above it are untaxed, so the average rate falls as income rises. It also starts at the first dollar of wages, and wage income makes up a smaller share of income for high earners, so both features push in the same direction.
Do you pay capital gains tax on an asset you have not sold?
No, most systems tax a gain only once it is realized through a sale. An asset that doubles in value creates no bill while it is held, which is why the timing of a sale is a decision with tax consequences attached to it.
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