DC Tax Residency Rules 2026: 183-Day Rule & Commuter Exemption

Who needs to read this

The District taxes its residents at up to 10.75% (higher than Maryland or Virginia at almost every income level) while federal law forbids it from taxing nonresident commuters at all. That combination makes residency the entire ballgame. This guide matters if:

• You moved into or out of DC this year; the DMV area's constant churn makes split years routine
• You keep a pied-à-terre in the District while your main home is elsewhere
• You're a congressional staffer, appointee, or fellow here "temporarily" for a posting
• You commute in from Maryland or Virginia and want to confirm you owe DC nothing
• You're a high earner weighing a DC address against a suburb across the line

How DC defines residency

Under D.C. Code §47-1801.04(42), you are a DC resident if either of these is true:

1. Domicile: you are domiciled in the District at any time during the taxable year, or
2. Statutory residency: you maintain a place of abode within the District for an aggregate of 183 days or more during the taxable year, whether or not you are domiciled in DC.

Read the second prong carefully: it is written around maintaining a place of abode for 183 days, not spending 183 days physically present. In practice OTR's filing guidance frames the test as living in the District for 183 days or more, but practitioners have flagged that the statutory text can be read to reach people who keep a DC apartment most of the year while sleeping elsewhere. If you maintain a year-round DC home, assume the prong is in play.

The definition also excludes elected federal officials and certain presidential appointees and congressional staff who are in DC solely because of their federal service, unless they are actually domiciled in the District. That carve-out is why a senator can rent in DC for decades and remain a resident of their home state; it does not extend to ordinary federal employees.

Counting the days

The DC count is aggregate rather than consecutive: any part of a day in the District counts, and "183 days or more" means 183 itself is enough, unlike states that require more than 183.

• Because the statutory prong keys off maintaining an abode, the lease term and the days you were present both matter: track when the apartment existed and when you were actually in DC.
• The person who needs records is the one near the line. A contemporaneous day log (iReside automates this) plus lease dates, badge records, and travel history is what settles a dispute in your favor.

Domicile: the stickier test

Domicile is your permanent home: the place you intend to return to. Because the domicile prong catches you if DC was your domicile at any time in the year, the timing of a move matters as much as the fact of it. The factors are the classic ones:

• Where your household actually lives, and which home is principal rather than kept-for-work
• Driver's license, voter and vehicle registration, and the address on your federal return
• Where your job, business interests, and professionals are
• The intended length and purpose of a DC stay: a genuinely time-limited posting points away from domicile; an open-ended life in the District points toward it

DC's transient professional class is exactly where this bites: a "two-year fellowship" that turns into six years of DC apartments, DC employers, and DC weekends looks like domicile no matter what your parents' address says. Conversely, leaving DC requires actually establishing the new home; a storage unit and a forwarding address don't end a DC domicile.

Part-year residents and nonresidents

Part-year residents file Form D-40 for the resident portion of the year; nonresidents file nothing at all.

• Full-year residents file Form D-40.
• Part-year residents also file Form D-40 for the resident portion of the year, prorating the standard deduction and applicable credits for the months of DC residency.
• Nonresidents file nothing: under the federal Home Rule Act, DC cannot tax nonresidents' income, no matter where it's earned. There is no DC nonresident return. If DC tax was withheld anyway, Form D-40B (Nonresident Request for Refund) recovers it.

The flip side: DC residents owe DC tax on everything, including wages earned in Maryland or Virginia. The DMV states don't tax each other's commuting residents, so most people around the line simply pay their home jurisdiction.

Resident rates run from 4% to 10.75% across seven brackets (post-2021 structure): 4% to $10,000, 6% to $40,000, 6.5% to $60,000, 8.5% to $250,000, 9.25% to $500,000, 9.75% to $1 million, and 10.75% above that.

Changing your residency status

Ending DC residency means ending the DC abode and moving the center of your life across the line; because a few Metro stops can change your top rate by multiple points, these moves get real scrutiny. To make one stick:

• End the DC abode: sell, or terminate the lease. Keeping a DC apartment "for late nights" is precisely what the 183-day abode prong is written for
• Establish the new home and move the center of your life to it: household, car, weekend patterns
• Re-register everything (license, voter registration, vehicle) in the new jurisdiction promptly, and update your employer so withholding follows
• File the part-year D-40 with a clear, documented move date
• Keep counting days for any year you retain a DC dwelling

Moving into DC works the same in reverse: residency starts when the DC home and the intent (or the 183 days of abode) arrive, and your prior state will want its part-year return too.

How DC enforces its rules

OTR's leverage is data matching: W-2 and 1099 addresses, DC withholding, driver's license and voter records, and lease and property records checked against filed returns.

• The classic audit letters go to people with DC-sourced W-2s claiming Maryland or Virginia residency, and to filers who stopped filing D-40s without an obvious departure
• Refund claims on Form D-40B require showing you were not a DC resident; expect to substantiate where you actually lived
• Penalties and interest run from the original due date; for an unfiled resident year, the exposure is the full 4%–10.75% schedule on all income, not just DC-sourced amounts

Common mistakes

• Believing commuter folklore in reverse. Nonresident commuters truly owe DC nothing, but residents owe DC tax on all income everywhere, and moving in without updating withholding creates an April surprise.
• Keeping the DC apartment after "moving." The statutory prong runs on maintaining an abode 183+ days; the cheap lease you kept is the government's whole case.
• Assuming the congressional exemption covers you. It's for elected officials and specified appointees and staff, not agency employees, contractors, or fellows.
• Sloppy split years. DC's domicile prong catches you if DC was home at any time during the year; an undocumented move date invites OTR to pick one for you.
• Forgetting 183 means 183. DC's threshold is "183 days or more," one day earlier than the "more than 183" states; cutting it that fine without records is a losing plan.
• Treating the District like a state with reciprocity paperwork. There's no certificate to file, just the hard question of where you actually resided.