Working graveyard hours or weekend shifts usually comes with a financial bonus: night shift differentials or premium shift pay. But how does the IRS treat these differential payments come tax season?
IRS Treatment: Gross Earnings vs. Supplemental Tax
A common myth among shift workers is that differential pay is taxed at a separate, higher rate. In reality, the IRS considers shift differentials, night premiums, and weekend extra pay as standard gross earned income.
They are subject to ordinary federal income tax rates, state income taxes, and FICA (7.65% for Social Security & Medicare).
The FLSA Regular Rate Calculation Trap
Under federal law, shift differentials must be included in your regular rate of pay before calculating overtime multiplier rates.
Example: If your base pay is $30/hr and you earn a $4/hr night shift differential, your base regular rate for night overtime is $34/hr. Your overtime rate must be calculated as $34 × 1.5 = $51/hr (not $45/hr + $4).
Why Your Paycheck Withholding Might Seem Higher
If your payroll software processes differential pay as a lump-sum adjustment or separate line item, employer payroll systems may apply standard supplemental tax withholding rates (22% federal flat rate). However, at year-end on your W-2, all earned wages are aggregated into Box 1.
The 2025-2028 federal overtime deduction
For tax years 2025 through 2028, federal law lets eligible workers deduct qualified overtime compensation: only the "half" of time-and-a-half that the FLSA requires, not the whole overtime paycheck. The deduction is capped at $12,500 ($25,000 on a joint return) and phases out above $150,000 of modified adjusted gross income ($300,000 joint). The overtime pay itself stays taxable wages; you claim the deduction on your return, and exempt employees generally do not qualify.
Example: at a regular rate of $34.00/hr, the FLSA premium on each overtime hour is $17.00. Fifty overtime hours in a year create $850 of qualified overtime compensation. Because the regular rate includes shift differentials, the premium is calculated on the blended rate, not on base pay alone. Overtime premiums that only a state law, a union contract or your employer adds above the FLSA amount do not qualify. Starting with 2026, employers must report qualified overtime separately on the W-2; for 2025 you use your pay records.
This is general information, not tax advice. See the IRS guidance for the overtime deduction (Notices 2025-62 and 2025-69) or ask a tax professional.