Nope, this was Intuit/TurboTax's error. The SS#s were not in error, no one else submitted my tax return before I did (really? using our DOBs, two IRS security PINS, etc). Nope, this was an Intuit e-file bug, pure and simple.
When I first tried to e-file, three items were selected to e-file: my Federal form, MN State form, and the MN Property Tax Refund. Ok, fine. I went ahead and tried to file all three at once. Nope.
Apparently that was the mistake which caused the bogus "Duplicate Social Security Number: A tax return with the same SS# has already been submitted..." error being shown twice. Yup, the full error message was shown twice. Quite odd.
Later, after sifting through these mostly-unhelpful responses and blind-alley referrals to blank Intuit search boxes, I decided to just try it again. This time the MN State Property Tax Refund was shown as already e-filed. Really? I thought all three failed to file. Good.
When I submitted the Fed and MN State returns, it filed in about 20 seconds with "Transmission Confirmation" even though I had not changed anything else on my tax returns. So, not my problem.
