FICA & Social Security Calculator (2026)

What FICA actually is

FICA stands for Federal Insurance Contributions Act—the payroll taxes that fund Social Security and Medicare. On a typical W-2 paycheck you see two employee lines: Social Security at 6.2% and Medicare at 1.45%. Your employer pays matching amounts on the same wages (except Additional Medicare Tax, which is employee-only above statutory thresholds).

FICA is not income tax. Brackets, standard deductions, and credits do not apply to these lines. That is why a household can owe little federal income tax and still see meaningful FICA on every stub until Social Security wages hit the annual cap.

This calculator isolates employee FICA on wages you enter. Pair it with the paycheck calculator when you want net pay, or the federal income tax calculator when you want ordinary income tax on AGI.

2026 FICA rates and limits

• Social Security employee rate: 6.2% on wages up to $184,500 (SSA 2026 wage base)
• Medicare employee rate: 1.45% on all covered wages—no cap
• Additional Medicare Tax: 0.9% on wages above $200,000 single / $250,000 joint / $125,000 MFS
• Combined employee rate before the wage base maxes out: 7.65% (6.2% + 1.45%)

The $184,500 figure comes from SSA’s 2026 contribution and benefit base announcement. It moves most years with national average wage indexing. Income tax brackets for 2026 come separately from IRS Rev. Proc. 2025-32—the two systems do not share the same inflation math.

How the wage base changes paycheck math

Social Security tax applies only until cumulative wages reach the base. Example: you earn $8,000 per biweekly check and have $170,000 year-to-date Social Security wages. Only $14,500 of base remains before the 6.2% slice drops off on later checks. Medicare keeps withholding at 1.45% on the full check.

High earners who ignore year-to-date often overstate FICA in DIY spreadsheets by dividing annual salary by 26 and multiplying by 7.65% all year. Enter YTD wages when you model November or December paychecks.

Additional Medicare Tax in practice

Employers must withhold Additional Medicare Tax at 0.9% once an employee’s wages exceed $200,000 in a calendar year—even if you will file married filing jointly and the return threshold is $250,000. That can mean extra withholding that you recover or owe when you reconcile on Form 8959.

If you are married filing jointly and each spouse earns $140,000, neither job may withhold Additional Medicare Tax at the employer level, but combined wages exceed $250,000 and you may owe the tax on the return. Planning requires looking at household wages, not one W-2 in isolation.

Employer vs employee: what you do not see on the stub

Employers match 6.2% Social Security and 1.45% Medicare on the same wages (until the Social Security base). That employer share is not deducted from your net pay—it is a cost of hiring you. Self-employed people pay both halves through self-employment tax instead.

Pre-tax cafeteria deductions—traditional 401(k), health premiums, FSA, HSA via payroll—generally reduce wages subject to FICA when the plan is structured correctly. Roth 401(k) deferrals do not reduce FICA wages. The 401(k) calculator shows how deferrals interact with taxable wages.

Worked example (single, $95,000 salary, 2026)

Assume $95,000 of Social Security and Medicare wages, single filer, no YTD yet:

• Social Security: 6.2% × $95,000 = $5,890
• Medicare: 1.45% × $95,000 = $1,377.50
• Additional Medicare Tax: $0 (wages below $200,000)
• Total employee FICA: $7,267.50

At $220,000 wages, Social Security still caps at $184,500 × 6.2% = $11,439. Medicare is 1.45% on all $220,000 = $3,190. Additional Medicare Tax is 0.9% × ($220,000 − $200,000) = $180. Run your numbers in the form above for cent-level output.

FICA vs self-employment tax

W-2 employees split FICA with employers. Schedule C profit triggers self-employment tax on net earnings—roughly 15.3% up to the Social Security base, then 2.9% Medicare with Additional Medicare Tax rules on combined W-2 and SE income. The self-employment tax calculator covers that path.

Side gigs on 1099-NEC add SE tax even when your day job already maxed Social Security. The wage base applies once per person across all covered earnings, but W-2 withholding and SE tax interact at filing time in ways a single-job FICA estimate will miss.

Common mistakes

• Treating FICA as deductible against income tax on Form 1040 (employee FICA is not an above-the-line deduction)
• Applying 7.65% to gross salary without subtracting pre-tax deferrals that reduce FICA wages
• Forgetting that Social Security stops at $184,500 while Medicare does not
• Assuming Additional Medicare withholding on one W-2 equals final household liability
• Confusing FICA with federal income tax withheld in W-2 box 2

Planning moves that touch FICA

Traditional 401(k) deferrals up to the 2026 limit of $24,500 reduce both income tax and FICA wages when made through payroll. HSA contributions via cafeteria plan reduce FICA too—see the HSA calculator for the 2026 limits ($4,400 self-only, $8,750 family, plus $1,000 catch-up at 55+).

Income tax planning—Roth conversions, bonus timing, estimated payments—does not change FICA on W-2 wages except indirectly through deferral choices. Use the W-4 withholding calculator for income tax gaps; use this tool for payroll tax on wages.

Multiple jobs and the wage base

Each employer withholds Social Security until your wages with that employer hit the base—or until your combined wages across all jobs exceed $184,500 and you have overpaid Social Security. Form 1040 Schedule 3 can credit excess Social Security tax withheld when two jobs pushed combined wages over the cap. Keep W-2s to document that reconciliation.

Related tools

Model full take-home with the paycheck calculator. Compare bonus withholding with the bonus tax calculator. Freelancers should pair this with the quarterly estimated tax calculator when SE tax enters the picture.

Reading your W-2 FICA boxes

Form W-2 box 3 shows Social Security wages (capped at $184,500 in 2026). Box 4 shows Social Security tax withheld—should equal 6.2% of box 3 unless your employer corrected mid-year. Box 5 shows Medicare wages (usually uncapped). Box 6 shows Medicare tax withheld at 1.45% of box 5 plus any Additional Medicare Tax withheld above $200,000 of wages. When boxes look wrong, compare against this calculator before calling payroll.

Box 1 (taxable wages for income tax) can differ from box 3 when you have pre-tax items that reduce income tax but not FICA, or the reverse in rare plan designs. That mismatch confuses people who expect one “wages” number everywhere.

Tip income and other wage types

Cash tips reported to your employer count as wages for FICA. Employers withhold and match on reported tips. Large tip income can push you through the Social Security base earlier in the year than salary alone suggests. Gig platforms that treat workers as employees follow the same FICA rules; true independent contractors pay SE tax instead.

Sources and methodology

Social Security wage base and rates follow SSA’s 2026 contribution and benefit base ($184,500). Medicare and Additional Medicare Tax rates are statutory (IRC §§3101, 3102, 3111, 3401). Results are educational estimates in integer cents with a visible calculation trace—not payroll advice or a substitute for your employer’s Publication 15-T withholding tables.