If you expect to have a balance due when you file your D-40, submit an extension of time to file request (Form FR-127 ) on or before May 17, 2021 in order to avoid penalties and interest.
Remember that any tax due must be paid in full with the extension request. Penalties and interest will be calculated on any tax outstanding from the time that the return is due until the tax is paid, even if an extension is granted (In other words, there is no extension for payments that you owe, just for the actual filing of your return).
If you do not expect to have a balance due when you file your D-40, a copy of the federal extension request is acceptable for requesting an extension of time for filing a DC return. If you do not expect to have a balance due and you have not filed a federal extension, you should submit a Form FR-127 if you would like to request an extension for your DC income tax return.
By filing a timely Form FR-127, plus any payment due (or a federal extension if no payment is due), you will have a 5-month extension to file your return. The return will then be due on October 15, 2021.
If you are living or traveling outside of the U.S., you may receive another 6-month extension, but you must file for the first 5-month extension by May 17, 2021 before applying for the additional extension of time to file. The tax due must still be paid in full with the first extension request.
The Office of Tax and Revenue will grant members of the US Armed Forces who serve in designated Combat Zones an extension of up to an additional 6 months to file their District income taxes, as well as pay any amounts that are due.
During this period of extension, assessment and collection deadlines are extended and no penalty and interest will be charged. The extension also applies to spouses, whether they file joint or separate returns.