The DC D-40 tax form is the District of Columbia’s individual income tax return, filed with the Office of Tax and Revenue (OTR) to report your annual income, calculate what you owe or are owed back, and claim local credits like the DC Earned Income Tax Credit. For tax year 2025, the D-40 is due April 15, 2026, and most people file it electronically through MyTax.DC.gov.
Who Has to File a D-40
You need to file a D-40 if any of these describe you for the tax year:
- You were domiciled in DC for the entire year and were required to file a federal return.
- Your permanent home was in DC for any portion of the year (part-year resident).
- You lived in DC for 183 days or more during the year, even if you consider your permanent home to be somewhere else.
- You’re a member of the armed forces and your home of record was DC for part or all of the year.
The 183-day rule catches people who don’t think of themselves as DC residents. If you maintain a place of abode in the District for a total of 183 days or more in a tax year, you count as a resident for income tax purposes regardless of where you’re domiciled.1Office of Tax and Revenue. Individual Income Tax Filing
Even if you owe nothing after deductions and credits, filing may still be worth your time. The D-40 is the only way to claim refundable credits like the DC EITC or the Schedule H property tax credit. Skip the return and you forfeit those benefits.
The Deadline and How to Get More Time
The D-40 for tax year 2025 is due April 15, 2026. If you need more time, file Form FR-127 by that same date for an automatic six-month extension, moving your filing deadline to October 15, 2026. Taxpayers living or traveling outside the United States can request an additional six months on top of that, but only if they first file the initial extension by the original due date.2MyTax DC. Instructions for Form FR-127
Here’s where people get tripped up. An extension gives you more time to file, not more time to pay. You still need to estimate what you owe and send payment with the FR-127 by April 15. Underpay and interest and penalties start accumulating from the original due date.
What You’ll Owe: Rates and Deduction
DC uses a graduated rate structure with seven brackets. The bottom rate is 4% on taxable income up to $10,000, climbing through 6%, 6.5%, 8.5%, 9.25%, and 9.75% at higher brackets, and topping out at 10.75% on income above $1,000,000.3Office of Tax and Revenue. DC Individual and Fiduciary Income Tax Rates Those rates apply to taxable income after your standard deduction and exemptions.
For tax year 2025, DC’s standard deduction is:
- $15,000 if you’re single, a dependent, or married filing separately
- $22,500 for head of household
- $30,000 for married filing jointly or qualifying widow(er)
If your itemized deductions exceed the standard amount, you can itemize on DC Schedule A instead.4Office of the Chief Financial Officer. District of Columbia Individual Income Tax Forms and Instructions
Credits That Can Make Filing Worthwhile
DC Earned Income Tax Credit
For tax year 2025, the DC EITC equals 100% of your federal Earned Income Tax Credit. If you qualify for the federal credit, you generally qualify for the DC version, effectively doubling the benefit. One unusual feature: if your DC EITC refund is $1,200 or more, you can opt to receive it in 12 equal monthly payments instead of a lump sum.5Office of Tax and Revenue. DC EITC
Schedule H Property Tax Credit
DC renters and homeowners with lower incomes can claim the Schedule H credit. For tax year 2025, the maximum is $1,425. You’re eligible if your federal adjusted gross income is $68,000 or less, or $90,000 or less if you’re 70 or older. Renters calculate their credit based on 20% of annual rent paid, treating that portion as equivalent to property taxes.6Office of the Chief Financial Officer. District of Columbia Schedule H
What to Gather Before You Start
Pull these together before opening the form:
- Social Security numbers for yourself, your spouse (if filing jointly), and all dependents
- Your federal adjusted gross income from Line 11 of Form 1040, which is the starting point for the DC return7Internal Revenue Service. Adjusted Gross Income
- All W-2s and 1099s, and confirmation that withholding matches what your employers reported to DC
- Exact move-in or move-out dates if you were a part-year resident, since credits and deductions get prorated
The D-40 includes Schedule I for adjustments to federal AGI. Some items get subtracted from DC taxable income, such as Social Security benefits and interest from certain government bonds. Others get added back, like interest from out-of-state municipal bonds. Schedule I is where most of the complexity lives if your income goes beyond a regular paycheck.
How to Submit the Return
Electronic filing through MyTax.DC.gov is the fastest route, and you’ll get a confirmation number on submission.8Office of Tax and Revenue. Individual Income Tax Forms If you’re taking direct deposit on a refund, check your routing and account numbers twice before you submit.
If you file on paper, the mailing address depends on whether you’re including payment:
- With payment: Office of Tax and Revenue, PO Box 96169, Washington, DC 20090-6169
- Refund or zero balance: Office of Tax and Revenue, PO Box 96145, Washington, DC 20090-6145
Sending a return to the wrong PO Box won’t void your filing, but it can delay processing.9Office of the Chief Financial Officer. Mailing Addresses for D.C. Tax Returns
Penalties for Filing or Paying Late
Missing the deadline costs real money, and DC imposes two separate penalties that can stack:
- Failure to file: 5% of the unpaid tax for each month or partial month the return is late, capped at 25%
- Failure to pay: 5% of the unpaid tax for each month payment is late, also capped at 25%
When both apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount for that month, so a single late month doesn’t cost a full 10%. On top of the penalties, interest accrues at 10% per year, compounded daily, from the original due date until the balance is paid.10D.C. Law Library. DC Code 47-4213 – Failure to File Return or to Pay Tax You can avoid penalties by showing reasonable cause, but “I forgot” doesn’t qualify. Filing a timely extension and paying your estimated balance by April 15 is the clean way to stay clear of all of this.
After You File
Track your refund with the “Where’s My Refund?” tool at MyTax.DC.gov. You’ll need your Social Security number and the exact refund amount from your return.11Office of Tax and Revenue. Check Your Tax Refund Status OTR’s enhanced security screening means some returns take longer than others, and the office estimates that processing certain returns can take up to eight weeks, particularly those flagged by fraud-prevention measures.12Office of Tax and Revenue. Refund FAQs Electronic filing is generally faster than paper, but OTR doesn’t publish a guaranteed turnaround.
You may receive a notice from OTR asking for more documentation or flagging a discrepancy. These are usually triggered by a mismatch between what you reported and what your employer submitted. Keep copies of your filed return, W-2s, 1099s, and supporting documents for at least three years from the filing date. The IRS recommends the same three-year retention as a baseline, with longer periods if you underreported income by more than 25% (six years) or didn’t file at all (indefinitely).13Internal Revenue Service. How Long Should I Keep Records