How a New Hampshire paycheck works
New Hampshire has never taxed wages. The state did levy a tax on interest and dividends, but that was repealed for taxable periods beginning in 2025, so residents now have no personal income tax of any kind. There is also no general sales tax; the state funds itself largely through business taxes and property tax. For an employee this means a payslip with federal deductions only: income tax under Form W-4, Social Security and Medicare.
Federal income tax withholding
The employer annualises the wage, subtracts the standard deduction for the filing status marked in Step 1 of Form W-4, runs the remainder through the progressive schedule for that status, and subtracts any dependent credit claimed in Step 3. This calculator reproduces that annual computation for a W-4 with Steps 2 and 4 left blank: one job, no spouse income, no other income and no extra withholding. Single filers and married-filing-separately share a schedule; married filing jointly and head of household each have their own.
The dependent credit is claimed in full while income stays under the statutory limit for the status. Past that limit it shrinks by a fixed amount for each thousand dollars of excess, and the calculator applies the reduction gradually so the estimate does not jump at the threshold.
Social Security and Medicare
Social Security is withheld at a flat rate on wages up to an annual wage base that is re-indexed every year; earnings above the base are exempt, which is why the effective rate of a large salary levels off. Medicare has no wage base. Once calendar-year wages pass a fixed threshold the employer must also withhold the Additional Medicare tax on the excess, regardless of filing status, and the employer does not match that piece.
What the employer pays on top
The employer matches Social Security and Medicare and pays federal unemployment tax. New Hampshire unemployment insurance is an employer contribution set from the company's own experience rating, so it is not a payslip deduction. The state's Business Profits Tax and Business Enterprise Tax fall on the business, and although the enterprise tax has a wage base, it is never withheld from an employee.
What this calculator assumes
The figure models a salaried employee paid evenly across the year on a standard Form W-4 with no pre-tax deductions. It leaves out:
- Pre-tax contributions such as a 401(k), health premiums, HSA or a flexible spending account, which lower the wages subject to income tax and often to FICA.
- Extra withholding requested on the W-4, and the Step 2 and Step 4 adjustments for a second job, a working spouse or other income.
- Bonuses and other supplemental wages, which employers may withhold at a flat supplemental rate instead.
- Employer-side state unemployment insurance, which is priced per employer, and any federal unemployment credit reduction.
- Employees outside the normal Social Security system, such as some public-sector staff and certain visa holders.
Withholding versus your final tax bill
Withholding is a prepayment, not the tax itself. The annual return replaces the standard assumptions with your real situation: itemised deductions when they beat the standard one, investment or freelance income, and credits the payroll system knows nothing about. Employees with one job usually see a refund; two jobs, a working spouse or significant investment income often produce a balance due. Use this page for monthly budgeting and a full return estimate for the year.