The DC capital gains tax works differently from the federal system: the District treats every capital gain as ordinary income, with no preferential rate for assets held longer than a year. Rates run from 4% to 10.75% depending on your total taxable income, and that bill sits on top of whatever you owe the IRS.
What You Actually Pay
DC draws no line between short-term and long-term gains. Whether you held the asset for six months or sixteen years, the profit lands on your return as ordinary income and runs through the District’s progressive brackets.1Office of Tax and Revenue. DC Individual and Fiduciary Income Tax Rates
For tax years beginning after December 31, 2021, the brackets are:
- 4% on taxable income up to $10,000
- 6% on income from $10,001 to $40,000
- 6.5% on income from $40,001 to $60,000
- 8.5% on income from $60,001 to $250,000
- 9.25% on income from $250,001 to $500,000
- 9.75% on income from $500,001 to $1,000,000
- 10.75% on income above $1,000,000
Because the gain stacks on top of your wages and other income, even a moderate sale can push the top slice of your income into a higher bracket than you’re used to.1Office of Tax and Revenue. DC Individual and Fiduciary Income Tax Rates
Adding Federal Tax on Top
DC residents owe federal capital gains tax and DC income tax on the same gain. At the federal level, long-term gains carry preferential rates of 0%, 15%, or 20% depending on income, while short-term gains are taxed at ordinary federal rates. High earners also owe the 3.8% Net Investment Income Tax.
DC then adds its own layer at ordinary rates. For a high-income resident with a substantial long-term gain, the combined marginal rate on the top slice can exceed 34%: 20% federal, plus 3.8% NIIT, plus 10.75% DC. That stacking is where the absence of a DC preferential rate hits hardest, because a state with lower investment-income rates would take a much smaller cut of the same gain.
How the Gain Is Calculated
Your capital gain equals the sale price, minus selling expenses, minus your adjusted basis. Basis starts with what you paid, including transaction costs like broker commissions or closing fees. For real estate, you add capital improvements and subtract depreciation claimed on a rental.
DC uses the same basis rules as the IRS. You compute the gain on your federal return and transfer the result to your DC return.2Office of Tax and Revenue. District of Columbia D-40 Individual Income Tax Forms and Instructions
Inherited property gets a stepped-up basis equal to the fair market value on the date of the prior owner’s death. If a parent bought stock for $20,000 and it was worth $200,000 when they died, your basis is $200,000, and you owe tax only on appreciation above that. DC recognizes the federal step-up.
Selling Your Home
DC follows the federal Section 121 exclusion. A single filer can exclude up to $250,000 of gain on a primary residence; a married couple filing jointly can exclude up to $500,000.3Office of the Law Revision Counsel. 26 U.S. Code 121 – Exclusion of Gain from Sale of Principal Residence You qualify if you owned and lived in the home as your main residence for at least two of the five years before the sale.
The exclusion applies on both federal and DC returns. Given DC real estate prices, many homeowners will fall entirely within it. Only gain above the threshold is taxable, so a married couple with $650,000 in appreciation would owe DC tax on $150,000.3Office of the Law Revision Counsel. 26 U.S. Code 121 – Exclusion of Gain from Sale of Principal Residence
Deferring the Tax on Investment Property
For investment or business real estate, a Section 1031 like-kind exchange lets you defer gain by swapping into a similar property. You must identify replacement property within 45 days and close within 180 days.4Office of the Law Revision Counsel. 26 U.S. Code 1031 – Exchange of Real Property Held for Productive Use or Investment Since the 2017 federal tax changes, this applies only to real property, not stocks or equipment. Because DC starts with your federal adjusted gross income, a properly structured 1031 defers the gain for DC too; the gain carries into the lower basis of the replacement property.
DC also layers its own Opportunity Zone incentive on top of the federal program under D.C. Act 23-407, for investments in Mayor-approved Qualified Opportunity Funds in designated DC zones.5DC Opportunity Zone Marketplace. District Qualified Opportunity Fund The federal deferral window is closing: any deferred gain is recognized no later than December 31, 2026, regardless of whether you’ve sold the QOF investment.6Internal Revenue Service. Opportunity Zones Frequently Asked Questions The five- and seven-year basis step-ups can no longer be met before that deadline for new investments. What remains intact is the permanent exclusion of appreciation on the QOF investment itself: hold the interest at least ten years, and growth inside the fund is excluded from capital gains tax at both the federal and DC levels.7Office of the Deputy Mayor for Planning and Economic Development. Opportunity Zones in Washington, DC
When Losses Exceed Gains
If your capital losses for the year exceed your gains, DC follows the federal rule: you can deduct up to $3,000 of the net loss against other income, or $1,500 if married filing separately.2Office of Tax and Revenue. District of Columbia D-40 Individual Income Tax Forms and Instructions Any unused loss carries forward indefinitely, keeps its original short-term or long-term character, and offsets future gains dollar-for-dollar. Once gains are exhausted, the $3,000 annual deduction against ordinary income still applies.
Filing and Estimated Payments
Residents report capital gains on Form D-40, due April 15.8Office of Tax and Revenue. Individual Income Tax Forms There is no separate DC schedule for calculating gains. You compute the gain or loss on federal Schedule D and enter the result on Line c of the D-40.2Office of Tax and Revenue. District of Columbia D-40 Individual Income Tax Forms and Instructions Adjustments for differences between federal and DC law, such as DC-level Opportunity Zone benefits, go on Schedule I.
Estimated payments matter if you sell a large asset mid-year. If you expect your DC tax liability to exceed $100 after withholding, you must make quarterly estimated payments using Form D-40ES. Due dates are April 15, June 15, September 15, and January 15.9Office of Tax and Revenue. Underpayment of Estimated Tax Interest Your employer’s payroll withholding won’t cover the gain, so skipping the estimated payment means penalties at filing time.
Penalties for Paying Late
DC charges interest at 10% per year, compounded daily, on any tax not paid by the due date. A 5% per month penalty applies to unpaid balances for each month or partial month the tax remains outstanding.10DC Office of Tax and Revenue. FR-127 Extension of Time to File a DC Income Tax Return Worksheet An extension gives you more time to file the return but does not extend the payment deadline. On a significant gain, waiting until April to deal with it can add several percentage points to your effective rate.