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paycheck-calculator

A paycheck calculator estimates take-home pay (net pay) from gross wages by subtracting federal / state income tax, payroll taxes (Social Security + Medicare in the US, National Insurance in the UK, comparable in other countries), and pre-tax deductions (401(k), health-insurance premium, HSA / FSA contributions). The ZTools Paycheck Calculator runs in the browser, supports both salaried and hourly inputs, lets you toggle pay frequency (weekly, biweekly, semi-monthly, monthly), and is an educational estimator only — actual pay depends on local tax rules, filing status, dependants, and many edge cases; verify any number with your employer's payroll provider before making financial decisions.

Use cases​

Job-offer evaluation​

A $90K offer in California vs $85K in Texas — federal tax is similar, but California state tax + cost-of-living shifts the real take-home meaningfully.

Side-gig take-home check​

A consultant invoices $5K/month — what lands in the bank after self-employment tax and quarterly estimates? Calculator approximates.

401(k) contribution planning​

Increasing 401(k) from 5% to 10% — what is the actual take-home reduction? Often less than expected due to tax savings.

Hourly-to-annual translation​

$25/hour at 40 hours/week — net annual after taxes? Calculator shows both before and after deductions.

How it works​

  1. Pick pay type and frequency — Salaried (annual amount) or hourly (rate + hours). Pay frequency: weekly, biweekly, semi-monthly, monthly.
  2. Enter gross pay per period — For salaried, the calculator divides annual into per-period.
  3. Enter pre-tax deductions — 401(k) %, health-insurance premium, HSA/FSA, commuter benefits — anything pre-tax.
  4. Apply taxes — Federal tax via brackets, state tax via flat % or local schedule, FICA / NI / equivalent payroll tax.
  5. Show net pay — Gross − pre-tax deductions − taxes = take-home. Annualised view also shown.

Examples​

Input: Salary $80,000, US, single, 5% 401(k), no state tax

Output: Gross/biweekly $3,077 · 401(k) $154 · Federal $290 · FICA $223 · Net ~$2,410

Input: Hourly $25 × 40 hr/week, US single, 0% 401(k)

Output: Gross/biweekly $2,000 · Net ~$1,580

Input: UK £50,000 salaried, default personal allowance

Output: Gross/month £4,167 · Income tax £616 · NI £375 · Net ~£3,176

Frequently asked questions​

Why is my actual paycheck different from the calculator?

Many reasons: pre-tax deductions you did not enter (insurance, HSA), additional withholdings (e.g., supplemental income), state-specific items, post-tax deductions (Roth 401(k)), bonuses. Treat as a ballpark.

How is FICA calculated?

US Social Security: 6.2% on wages up to the annual wage base. Medicare: 1.45% on all wages, plus 0.9% additional Medicare tax above thresholds. Total: 7.65% for most workers, employer matches.

Does pre-tax deduction reduce my take-home dollar-for-dollar?

No — it reduces taxable income too. So $100 pre-tax 401(k) reduces take-home by ~$70–80 depending on bracket. Effective "cost" of saving is less than the amount saved.

Should I use Roth or traditional 401(k)?

Depends on your tax bracket now vs in retirement. The calculator can model traditional (pre-tax) easily; Roth (post-tax) reduces take-home but produces tax-free retirement withdrawals.

Are bonuses taxed differently?

In the US, supplemental wages are withheld at flat 22% for the first $1M. Actual tax owed at year-end matches your normal bracket — overwithholding is refunded.

Will it tell me if my employer is withholding correctly?

It is an estimate. For real verification, check your year-end pay stubs vs filed taxes; significant mismatches warrant a payroll inquiry.

Tips​

  • Treat the result as a ballpark — actual paycheck has many fine-grained inputs.
  • For job-offer comparisons, use the same calculator for both offers — apples to apples.
  • Pre-tax retirement savings cost less than they save — the tax break makes contributions more affordable than they look.
  • Verify state / local tax rates for your specific jurisdiction.
  • After a major tax-law change, recompute — withholding tables shift annually.

Try it now​

The full paycheck-calculator runs in your browser at https://ztools.zaions.com/paycheck-calculator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub