If you had NYC income reported on a W2, your NYS and 1040 return will suffice. If you have a separate income source not reported on a W2 - for instance, an unincorporated business or partnership - you need to file a separate NYC return for that. TurboTax will do some of the work for you based on your 1040 and NYS return but you must complete the NYC 202S or similar return manually, print it out, and mail it.
