Salary Breakdown Calculator
Enter your salary to see a full breakdown of federal income tax, FICA, and your real take-home pay.
On an $80,000 US salary (single filer) you take home approximately $5,102/month after federal income tax and FICA — an effective rate of 23.5%.
$12,953
average federal income tax on an $80,000 salary (single filer, 2024)
7.65%
combined FICA rate — 6.2% Social Security + 1.45% Medicare employee share
22%
marginal federal rate on income between $47,150 and $100,525 (2024 single filer)
How salary tax is calculated
Both the UK and US use progressive tax systems — you pay a higher rate only on the income above each threshold, not on your whole salary. The calculation has three stages:
Deduct pre-tax contributions
Pension (UK) or 401(k) (US) contributions reduce the income that tax is calculated on.
Apply income tax brackets
Each slice of your income is taxed at the rate for that band. Higher income means a higher rate on the top slice only.
Add payroll levies
National Insurance (UK) or FICA — Social Security + Medicare (US) — is calculated separately on top of income tax.
US federal tax brackets and FICA (2024)
Federal income tax is progressive. FICA (Social Security + Medicare) is applied separately as a flat percentage. State income tax is not included — rates vary from 0% (Texas, Florida) to over 13% (California).
Federal Tax (Single filer)
FICA
Employers match FICA contributions — the employee only pays half the total 15.3%.
How pension and 401(k) contributions reduce your tax
Contributing to a pension (UK) or traditional 401(k) (US) reduces the income that tax is calculated on — so every pound or dollar you save also saves you tax at your marginal rate.
UK — Pension
On a £60,000 salary, a 10% pension contribution (£6,000/yr) brings taxable income below the higher-rate threshold. Instead of paying 40% on that £6,000, you pay nothing. Saving £2,400 in tax.
US — 401(k)
On an $80,000 salary, contributing 10% to a 401(k) ($8,000/yr) reduces federal taxable income to $72,000. At a 22% marginal rate, that saves approximately $1,760 in federal tax.
What this means for you
Three things most people misunderstand about how US federal tax actually works.
Your marginal rate ≠ your real rate
On an $80,000 salary your marginal rate is 22%, but your effective federal rate is around 15.8%. Only income above $47,150 is taxed at 22% — everything below is taxed at lower rates.
Social Security has a ceiling
The 6.2% Social Security tax only applies to wages up to $168,600 in 2024. Above that cap you stop paying SS — though Medicare (1.45%) has no ceiling and applies to all wages.
Every 401(k) dollar saves tax now
A traditional 401(k) contribution reduces your federal taxable income dollar-for-dollar. At a 22% marginal rate, $1,000 into your 401(k) saves $220 in federal tax — immediately, before any investment growth.
What you can do next
Practical steps to legally reduce your federal tax bill.
Check your W-4 withholding
If your employer is withholding too much or too little, you'll get a large refund — or owe at filing time. Update your W-4 after a pay rise, marriage, or new dependant to stay accurate throughout the year.
Max your 401(k) first
The 2024 limit is $23,000 ($30,500 if 50+). Every dollar goes in pre-tax, reducing taxable income at your marginal rate. If your employer matches contributions, that's an instant 50–100% return before any investment gains.
Compare single vs married filing
Filing jointly gives wider brackets and a higher standard deduction. Use this calculator to model both statuses and see which produces the lower effective rate — especially useful in the year you get married.
Frequently asked questions
How much federal income tax do I pay on an $80,000 salary?
On an $80,000 salary with no 401(k) contributions, you pay $12,653 in federal income tax using 2024 single-filer brackets (10%, 12%, and 22% on the relevant slices). FICA adds another $6,120, giving a combined effective rate of about 23.5%.
What is FICA and how much do I pay?
FICA covers Social Security (6.2% on wages up to $168,600) and Medicare (1.45% on all wages) — a combined 7.65% employee share. Your employer matches the same amount on top.
Does a 401(k) contribution reduce my Social Security tax?
No. Traditional 401(k) contributions reduce your federal income tax but not FICA. Social Security and Medicare are calculated on your gross wages before the 401(k) deduction.
What is the difference between single and married filing status?
Married filing jointly uses wider tax brackets. On the same total household income, a married couple typically pays less federal tax than two single filers. The calculator supports both status options.
What is the difference between my marginal and effective tax rate?
Your marginal rate is the rate on your top slice of income. Your effective rate is the average across all your income — always lower, because lower bands are taxed at lower rates. On an $80,000 salary, your marginal federal rate is 22% but your effective rate is around 15.8%.
Why doesn't this calculator include state income tax?
State income tax rates vary from 0% (Texas, Florida, Nevada) to over 13% (California) and require a separate calculation. This tool focuses on federal tax and FICA for a clean universal US estimate. For state-specific results, use the Take Home Pay Calculator.
Disclaimer
This calculator provides estimates based on 2024 US federal tax rates and is intended for general planning purposes only. It does not include state income tax, local taxes, itemised deductions, or other personal circumstances. Always verify with a qualified tax adviser before making financial decisions.