Interesting. It would be nice for TurboTax to potentially ask about the grace period specifically. In 2024, it just asks how much was paid "in 2024". TurboTax says not to include "expenses incurred in 2023, 2025 expenses you prepaid in 2024, or expenses you paid in 2025, even if they were for 2024". That last line is very ambiguous. I could be if you paid for the last week of December in January, do not include it. Or if you paid for expenses in 2025 during the grace period for 2024, do not include it.
2025 turbotax explicitly asked about carryover from 2024 and says this includes the amount used during the grace period.
