> 2025 software mostly uses the 2024 numbers until AT LEAST the mid-December update
What gave you that idea? What numbers are you talking about? The 2025 tax brackets, deductions, even much of the OBBB changes (including the extended senior deduction) were in the initial public release around the first of November.
When I first move estimates into TT, I compare with Dinkytown (where I do estimates prior to TT release) and did not find any discrepancy.
I've been using TT for end of the year estimates since the 1990s.
While it is certainly true that the forms aren't finalized or approved by the IRS, and there are certain areas (such as handling complex qualified distributions) that aren't fully functional yet, and of course a few bugs, the assertion that "the numbers" are from 2024 is just wrong. For the most common numbers such as tax brackets and things indexed to inflation, the TY2025 numbers were finalized by the IRS over a year ago.
