To claim the OBBBA overtime deduction you need to substantiate the qualifying overtime premium — your pay stubs and W-2 should separate overtime, and employers are expected to report it.
Keep your year-end stub and any employer statement; if overtime isn't broken out, you may need to reconstruct the premium portion from your hours and base rate.
Estimate the deduction from your real overtime hours before filing so the number on your return matches your records.
Try it: NoOvertimeTax on recordkeeping overtime tax deduction.