Texas has no state income tax. Roth conversions cost only federal tax, making this one of the most favorable states for large conversions. A $250K conversion at the 22% federal bracket costs $55,000 in total tax with no state component.
The break-even calculation is simpler in Texas: if your future federal marginal rate at retirement exceeds your current rate, converting now wins. If you expect to be in a lower bracket at 73 (RMD age), traditional may outperform. Most HNW investors with $1M+ in tax-deferred accounts benefit from partial conversions during low-income years.