I have a client who is a business owner that operates out of Washington, DC but is a GA resident. DC OTR informed me that I need to file a Form D-30 Unincorporated Business Franchise Tax Return for Wash DC.  I also need to file a GA500 individual tax return for GA state, however my client should get an other state credit from DC, as he did not earn his income in GA.  My question is, do I use the income and income tax from the D-30, and report that as the state tax credit on the GA state return?

Please advise and thanks!