When you were preparing your return you should have prepared a return as a non-resident of DC. There are a couple of steps where you fill out the D-40B and verify your state of residency. Then, when you have reached the end and have filed your federal return you will be able to print the DC form and save it to your computer as a pdf. It should be separate from your federal return as a completely different file. Then you can print it, sign it and mail it to the address that TurboTax includes in the pdf.
@Tmye
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