ACA Subsidy Cliff Calculator
2026 Tax Year — 0% Bracket: $49,450 Single / $98,900 Married

Capital Gains Bump Zone Calculator

Find out how much you can harvest at the 0% capital gains rate, identify the bump zone where rates jump from 0% to 15%, and plan tax-efficient gain harvesting.

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Wages, pensions, IRA/401(k) withdrawals, Social Security, and other non-investment income.

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Gains from selling assets held longer than 1 year.

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Qualified dividends are taxed at the same preferential rates as long-term gains.

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Gains from assets held 1 year or less — taxed as ordinary income.

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Considering selling additional assets? Enter the gains to see the tax impact.

What Is the 0% Capital Gains Bracket?

Long-term capital gains (assets held over 1 year) and qualified dividends are taxed at preferential rates: 0%, 15%, or 20%, depending on your total taxable income. For 2026, the 0% rate applies to taxable income up to $49,450 (single) or $98,900 (married filing jointly).

The critical insight is that ordinary income fills this bracket first. Your wages, pensions, IRA withdrawals, and Social Security all count. Only the remaining space is available for long-term gains at 0%. This is why the same gains can be tax-free in one year and taxed at 15% in another.

The Bump Zone: Where Rates Jump

The “bump zone” occurs when your gains straddle the 0%/15% boundary. Below the boundary, each dollar of gains is tax-free. Above it, each dollar is taxed at 15%. When combined with the Social Security tax torpedo, the effective marginal rate in the bump zone can reach 27% or higher — far above what most retirees expect.

Tax-Gain Harvesting: The Retirement Opportunity

Tax-gain harvesting is the strategy of intentionally selling appreciated assets when you have room in the 0% bracket, then repurchasing immediately. Unlike tax-loss harvesting (which defers taxes), tax-gain harvesting at 0% permanently eliminates the tax on those gains by resetting your cost basis. The best window is during retirement gap years — after leaving work but before Social Security and RMDs begin.

Watch for interactions:Capital gains count toward provisional income (affecting Social Security taxation), MAGI (affecting IRMAA Medicare surcharges), and ACA subsidy eligibility. A gain harvested at “0%” could still cost you thousands in lost subsidies or higher Medicare premiums.

2026 Capital Gains Rate Thresholds

Filing Status0% Rate15% Rate20% Rate
SingleUp to $49,450$49,451 – $545,500Above $545,500
Married (MFJ)Up to $98,900$98,901 – $613,700Above $613,700
Head of HouseholdUp to $66,250$66,251 – $576,600Above $576,600

Related Retirement Tax Tools

SS Tax Torpedo Calculator

Capital gains increase provisional income, triggering Social Security taxation.

IRMAA Medicare Planner

Capital gains count toward MAGI for Medicare surcharge brackets.

ACA Subsidy Cliff Calculator

Gains affect MAGI for ACA health insurance subsidies — a $1 mistake can cost $10,000+.

NIIT Calculator

Capital gains may also trigger the 3.8% Net Investment Income Tax above $200K/$250K.

Frequently Asked Questions

What is the capital gains bump zone?

The bump zone is the income range where your long-term capital gains transition from the 0% rate to the 15% rate. When your gains straddle this boundary, the effective marginal rate on additional gains jumps from 0% to 15% — a hidden cliff. For single filers in 2026, this happens at $49,450 of taxable income; for married filing jointly, at $98,900.

How does the 0% capital gains bracket work?

Long-term capital gains and qualified dividends are taxed at 0% up to certain thresholds based on your total taxable income. Importantly, ordinary income fills this bracket first — so your wages, pensions, and IRA withdrawals reduce the space available for gains at 0%. Only the remaining room in the bracket can hold gains tax-free.

What is tax-gain harvesting?

Tax-gain harvesting is the strategy of intentionally selling appreciated assets when you're in the 0% capital gains bracket, then immediately repurchasing them. This resets your cost basis higher, eliminating future tax on those gains — legally and permanently. It's most valuable during retirement gap years when income is low.

How do capital gains interact with Social Security taxation?

Capital gains increase your provisional income, which can push more of your Social Security benefits into taxation (the 'tax torpedo' effect). They also count toward MAGI for IRMAA Medicare surcharges and ACA subsidy eligibility. This means the true cost of realizing gains can be much higher than the stated capital gains rate.

How accurate is this calculator?

This calculator uses official 2026 capital gains brackets from IRS inflation adjustments (OBBBA-amended) and standard deductions. It provides a simplified estimate focused on the 0%/15%/20% rate structure. Actual taxes may also include the 3.8% Net Investment Income Tax (NIIT), state taxes, and AMT. Consult a tax professional for a complete analysis.