Turbotax caused the issue - actually two issues. These are very concerning - it's hard to trust software that has these types of errors so close to the filing deadline. Why haven't these been addressed?
1) I had overridden a field, then reverted the override. My taxes were saved before the software was updated, but somehow the overrides showed up again after the update. I caught the issue myself by reviewing the 1040 form and seeing the old entry. I almost filed without fixing this - would have cost me $4k.
2) Form 8801 doesn't correctly compute - for the issue and solution, see https://ttlc.intuit.com/community/taxes/discussion/i-noticed-turbotax-form-8801-does-not-calculate-p.... This is SUPER bad because it was discovered and a workaround posted on forums a month ago! Another $8k that I almost overpaid. Thankfully I did some google searching for the issue, but no thanks to Turbotax (other than to provide servers for a great community forum)
