Tax Withholding Calculator USA (Estimate W4 & Paycheck Deductions)

Federal tax withholding is the amount your employer deducts from each paycheck and sends directly to the IRS. It acts as a prepayment of your annual income tax liability. The amount is based on your gross wages, pay frequency, filing status, and your Form W-4 elections. When you file your tax return in April, the IRS compares what was withheld to what you actually owe and issues a refund or sends you a bill for the difference.

For 2026, employers use the percentage method from IRS Publication 15-T. The process involves: annualizing your per-period wages, subtracting pre-tax deductions, adding any W-4 Step 4a income, subtracting any W-4 Step 4b deductions, applying the 2026 tax brackets to get the annual federal tax, subtracting W-4 Step 3 credits, then dividing the result by pay periods to get the per-paycheck amount. Any extra withholding from W-4 Step 4c is added on top.

The IRS increased the 2026 standard deductions due to inflation. Single filers and married individuals filing separately can deduct $16,100. Married couples filing jointly can deduct $32,200. Heads of household can deduct $24,150. These are up from $15,000, $30,000, and $22,500 respectively in 2025.

FICA (Federal Insurance Contributions Act) covers Social Security and Medicare taxes. In 2026, Social Security is withheld at 6.2% on wages up to the $176,100 wage base. Medicare is withheld at 1.45% on all wages, with an additional 0.9% withheld on wages above $200,000 for single filers ($250,000 for married filing jointly). Your employer matches the 6.2% and 1.45% portions but not the extra 0.9%.

You can reduce withholding by updating your W-4 with your employer. The main options are: adding qualifying dependents in Step 3 (reduces withholding by the credit amount), entering expected itemized deductions above the standard deduction in Step 4b, or if you have a working spouse, using the IRS multiple jobs worksheet. Be careful not to under-withhold significantly or you may face a penalty at tax time. Use the W-4 Calculator for a guided approach.

No. Nine states have no state income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. If you live and work in one of these states, your withholding only includes federal income tax and FICA. Note that Washington state has a capital gains tax but no general income tax on wages. If you live in one state and work in another, the rules vary and you may owe taxes in both states.

The Social Security wage base for 2026 is $176,100. This means Social Security tax (6.2%) is only applied to the first $176,100 of your wages for the year. Once you reach that amount, no more Social Security tax is withheld for the rest of the year. Medicare tax has no wage cap and is withheld on all wages at 1.45%, plus 0.9% on the amount above $200,000.

Withholding is what your employer removes from your paycheck throughout the year as a pre-payment toward your tax bill. Your actual tax liability is calculated when you file your return in April based on your full-year income, deductions, and credits. If your withholding was too high, you get a refund. If it was too low, you owe the balance. The goal is to get withholding close to your actual liability to avoid large refunds (essentially interest-free loans to the IRS) or unexpected tax bills.