This will be my 1st time submitting a DC form D-30 (for unincorporated business franchise tax) for a client.  I imagine I can e-file the D-30 simultaneously with the client's 1040 and DC form D-40 income tax returns.  But in an accounting office where I worked, I believe some tax preparers made two e-filings: one for the D-30 and a separate e-filing for the 1040 and D-40.  Is there a reason for making two e-filings or am I missing something?  (My client's D-30 will be for a 1040 Schedule C business.)  Thanks.