Inflation adjustments are typically released by the IRS in October/November.
This assumes no changes to tax laws.
That is what I was asking about I guess. The tax rate reductions are set to expire for 2026, making the new 22% bracket 25%, so I would want to roth convert up to the 24% limit by end of 2025.
When would we know? Is there a deadline by which they can't change 2026 taxes?
There is no legal deadline.
There is a constitutional prohibition to ex post facto laws, but my understanding is that only applies to criminal statutes.
In fact, I think during one of the COVID years there was a law passed in the spring which affected the prior year taxes. It was a beneficial change, but it was a hassle to manage because it was in the middle of filing season.
I expect Congress to pass a tax bill sometime this year, and if they do it will be all over the news and all over sites like this one. What that tax bill will look like I have no clue. Personally I think reverting back to the 2016 environment is unlikely.
Tactically speaking, I agree with what a previous poster said - try to wait if you can. Roth conversions can be done any time during the calendar year, so mid-December is fine for those.