Thanks for looking into this further. I was quite sure that the license said "household" in some version/revision, but perhaps not.
The 5 federal E-filings limit appears to be an IRS restriction. It says so in the TT license, but see also https://ttlc.intuit.com/community/taxes/discussion/i-need-to-efile-more-than-federal-returns-for-fam....
