Even with $0 New Hampshire state wage income tax withholding, your net pay may be lower than your gross pay because of federal income tax, Social Security, Medicare, health insurance, traditional 401(k), HSA, FSA, or other pre-tax deductions.
Roth contributions, garnishments, and some insurance or benefit deductions may be post-tax. Post-tax deductions generally do not reduce taxable wages, but they still reduce your final take-home pay.
Tips, reported tip income, overtime, bonuses, commissions, shift differentials, irregular pay periods, payroll software, federal W-4 settings, work location, employer timing, benefits, and deductions can make actual New Hampshire paychecks differ from this estimate.