Skip to content

Paycheck calculator and FICA split

A paycheck is gross pay minus FICA and whatever income tax is withheld. FICA is 6.2 percent Social Security plus 1.45 percent Medicare. On a $2,000 weekly check with 12 percent federal withholding and no state tax, FICA is $153 and take-home is $1,607.

Take-home this check

$1,607.00

80.35% of gross. FICA is $153.00.

Gross
$2,000.00
Social Security (6.2%)
$124.00
Medicare (1.45%)
$29.00
Federal withholding
$240.00
State withholding
$0.00
Take-home
$1,607.00
$
%

A rate you type, not a bracket table. Use the percent on a pay stub or a guess.

%
$

The annual wages Social Security still taxes. The statutory figure is reset each year.

The formula

Net=G−0.062min⁡(G,B/n)−0.0145G−fG−sG\text{Net} = G - 0.062\min(G, B/n) - 0.0145 G - fG - sG

GG is gross pay this check, nn the number of checks a year, BB the Social Security wage base, ff federal withholding as a decimal, and ss state withholding as a decimal. The min term spreads the annual Social Security cap evenly across the year's checks.

What FICA actually takes

FICA is two statutory rates, not a guess and not a bracket. Social Security is 6.2 percent of wages up to an annual wage base. Medicare is 1.45 percent of this check with no cap in the ordinary case. On a $2,000 check that is still under the base, Social Security is $124 and Medicare is $29, so FICA is $153.

Income tax is the other slice, and it is not FICA. Federal withholding depends on filing status, the W-4, and the IRS percentage method. This calculator does not run that table. You type a federal percent and, if you want, a state percent, which is what a stub already printed or what a class wants to hold still while FICA moves.

The wage base is an input because the statutory figure is reset each year. The default here is $168,600. Put the figure your stub or your course is using.

Equal checks, not a January spike

A real payroll file charges 6.2 percent on every dollar until year-to-date wages hit the base, then Social Security on later checks is zero. This calculator does not ask for year-to-date. It takes the annual 6.2 percent of wages up to the base and spreads that cost evenly across the year's checks, so the number you see is the average check in a year of equal pay.

On $2,000 a week, 52 checks, annual wages are $104,000, which sits under $168,600, so the even spread and the January-to-December file print the same Social Security: $124 a check. The two methods part once annual wages clear the base. A $4,000 weekly check annualises to $208,000. The even spread charges $201.02 of Social Security on every check. A real file would charge 6.2 percent of $4,000 until the base was used up, then nothing. If you are reading a December stub, type the Social Security line off the stub rather than using this average.

Withholding is not the tax bill

Federal withholding is an estimate sent in during the year. The marginal tax rate is the rate on the next dollar of taxable income. The effective tax rate is total tax over total income. None of those three has to equal the percent you type here.

A 12 percent withholding on $2,000 is $240 this check. That can be close to the eventual federal bill, or not, depending on deductions, credits, and whether pay is even across the year. Treat the federal and state sliders as a way to see how take-home moves when withholding moves, not as a filing.

Take-home on the first worked example is $1,607, which is 80.35 percent of gross. Adding 5 percent state withholding takes another $100 and leaves $1,507, or 75.35 percent. FICA did not change. The state line did.

What this page is not doing

It is not a W-4 engine, not a state-tax table, and not the additional 0.9 percent Medicare surtax that applies to high earned income. It does not pretax a 401(k) deferral before FICA: in the United States, FICA is charged on wages before that deferral, which is why a match and a paycheck are different objects. The employer match calculator is the next page if the question is how much of pay the plan will copy.

For the household plan that the leftover money has to live inside, see how budgeting works. This is educational material, not financial advice, and it is not a substitute for a payroll system or a tax return.

Worked examples

A \$2,000 weekly check, 12 percent federal, no state

Gross pay is $2,000 a week, 52 checks a year. Federal withholding is 12 percent, state is 0, and the Social Security wage base is $168,600. What is FICA, and what is take-home?

  1. Annual wages: 2000×52=1040002000 \times 52 = 104000, so $104,000, which is under the $168,600 base.
  2. Social Security this check: 0.062×2000=1240.062 \times 2000 = 124, so $124.
  3. Medicare: 0.0145×2000=290.0145 \times 2000 = 29, so $29. FICA is $124 + $29 = $153.
  4. Federal withholding: 0.12×2000=2400.12 \times 2000 = 240, so $240. State is $0.
  5. Take-home: 2000−153−240=16072000 - 153 - 240 = 1607, so $1,607, which is 80.35 percent of gross.

FICA is $153. Take-home is $1,607, or 80.35 percent of the $2,000 check. Annual gross is $104,000.

The same check with 5 percent state tax

Keep the $2,000 weekly check, 12 percent federal, and the $168,600 wage base. Add 5 percent state withholding. What happens to take-home?

  1. FICA is unchanged: $153, because Social Security and Medicare do not look at the state line.
  2. Federal withholding is still $240.
  3. State withholding: 0.05×2000=1000.05 \times 2000 = 100, so $100.
  4. Take-home: 2000−153−240−100=15072000 - 153 - 240 - 100 = 1507, so $1,507, which is 75.35 percent of gross.

Take-home falls to $1,507. The $100 gap is the state line. FICA is still $153.

A \$4,000 weekly check that clears the wage base

Gross pay is $4,000 a week, 52 checks, 22 percent federal, no state, wage base still $168,600. What is Social Security on the average check?

  1. Annual wages: 4000×52=2080004000 \times 52 = 208000, so $208,000, which is above the $168,600 base.
  2. Annual Social Security is 6.2 percent of the base: 0.062×168600=10453.200.062 \times 168600 = 10453.20, so $10,453.20 a year.
  3. Spread across 52 checks: 10453.20/52=201.02310453.20 / 52 = 201.023, which prints as $201.02.
  4. Without the cap, Social Security on this check would be 0.062×4000=2480.062 \times 4000 = 248, so $248.
  5. Medicare has no cap here: 0.0145×4000=580.0145 \times 4000 = 58, so $58. Federal withholding is $880.
  6. Take-home: 4000−201.02−58−880=2860.984000 - 201.02 - 58 - 880 = 2860.98, so $2,860.98, which is 71.52 percent of gross.

Social Security on the average check is $201.02, not 6.2 percent of $4,000. Take-home is $2,860.98. Annual gross is $208,000.

The mistake that costs the most

Calling FICA the tax bill, or charging 6.2 percent Social Security on a check after the wage base is already used up.

FICA is two payroll taxes with their own bases. Federal income tax is a different statute. Adding them up and calling the pile 'tax' hides that one of them stops and the other does not.

On the $4,000 weekly check, 6.2 percent of $4,000 is $248. The average-check Social Security is $201.02 because the annual cap has already done part of the work. Using $248 every week overstates the year's Social Security by thousands.

Common questions

Is this how my actual stub is calculated?

FICA rates, yes, while this check is still under the Social Security wage base. Federal and state withholding, no: those come from a W-4 and a percentage method this page does not run. Type the percents off a stub if you want this check to match that stub.

Does a 401(k) deferral change FICA?

In the United States, employee FICA is charged on wages before a 401(k) deferral. Lowering federal taxable wages does not lower the Social Security or Medicare lines on this calculator. The match is a different object, on the employer match calculator.

Why is the wage base an input?

The statutory Social Security wage base is reset each year. Baking one year's figure into the formula would make every later stub look wrong. Put the base your course or your stub is using. The default is $168,600.

Keep reading

This page is educational material, not financial advice. The figures come from the formula shown and assume the inputs you enter hold for the whole term. Your own rate, fees, taxes and timing will differ, so treat the output as arithmetic to check a decision against, not as a recommendation.