FICA Tax: The Complete Guide

For 2026, Social Security tax is 6.2 percent for the employee and 6.2 percent for the employer on covered wages up to $184,500. Medicare tax is 1.45 percent for each side on covered wages without a wage cap. Employers also withhold 0.9 percent Additional Medicare Tax after wages they pay to one employee exceed $200,000 in the calendar year; the employer does not match that additional amount. FICA depends on worker status, taxable wage definitions, annual accumulators, deposit schedules, employment returns, and W-2 reconciliation.

This guide is part of Steady’s Business Taxes & the IRS library. It explains the federal workflow in practical terms, but the correct result still depends on the payment year, entity, worker relationship, filing method, and state rules.

The answer in context

Social Security has a wage base

Stop regular Social Security withholding for one employer after covered 2026 wages reach $184,500.

Medicare has no wage cap

The regular 1.45 percent employee and employer portions continue on covered wages.

Additional Medicare is employee-only

Withhold 0.9 percent after the employer pays the employee more than $200,000 during the year.

Federal income tax is separate

FICA rates do not determine Form W-4 income-tax withholding.

FUTA is separate

Federal unemployment tax is an employer tax with its own Form 940 rules.

Taxable wage bases can differ

Benefits, retirement deductions, tips, sick pay, and fringe benefits can affect income-tax, Social Security, and Medicare wages differently.

Each employer applies its own wage base

An employee with multiple employers may exceed the combined Social Security base and address excess withholding on the individual return.

Deposits include withheld and employer amounts

Deposit timing follows the employer’s assigned schedule and special next-day rule.

Form 941 reports both sides

Quarterly totals should reconcile to payroll registers, deposits, the general ledger, and W-2/W-3.

State payroll taxes remain

FICA does not replace state unemployment, withholding, paid leave, disability, or local taxes.

Step-by-step workflow

1. Confirm employee status. Do not calculate FICA for a contractor without first resolving classification.
2. Configure current-year rates. Load 2026 Social Security, Medicare, Additional Medicare, and wage-base settings.
3. Map wage treatment. Document how every earning, deduction, reimbursement, and benefit affects each federal tax base.
4. Calculate each payroll. Apply employee withholding, employer match, annual accumulators, and Additional Medicare threshold.
5. Review threshold crossings. Test employees approaching $184,500 and $200,000 before releasing payroll.
6. Post liabilities. Record gross wages, employee taxes, employer taxes, deductions, cash, and liability accounts.
7. Deposit on schedule. Use the correct EIN, form, period, amount, and electronic confirmation.
8. File Form 941 or 944. Use the return assigned by the IRS and reconcile it to deposits and payroll.
9. Prepare W-2 and W-3. Tie Social Security and Medicare boxes to annual payroll and employment returns.
10. Correct the full chain. Update employee pay, payroll, deposits, returns, W-2, accounting, and states as applicable.

Worked example

An employee earns $190,000 from one employer in 2026. Social Security tax applies only through $184,500, producing $11,439 of employee withholding and the same employer amount. Regular Medicare tax applies to all $190,000, producing $2,755 for each side. Additional Medicare withholding has not begun because wages from that employer have not exceeded $200,000. The employer reconciles these totals to payroll, Form 941, deposits, and W-2 boxes rather than applying 7.65 percent to every dollar.

The example is intentionally a workflow illustration, not a conclusion for every taxpayer. A strong file connects each number on the return to a source report and records why an exception, exclusion, or classification was applied.

Records to keep

Keep the source form or worksheet, contracts or engagement records, payer and recipient identity support, the detailed payment or payroll ledger, bank and processor reconciliation, calculations, correspondence about corrections, filed copies, recipient-delivery evidence, and federal and state acceptance confirmations. Store the records by tax year and keep superseded versions when they explain a correction.

A reviewer should be able to begin with the final reported amount and trace it back to transactions without rebuilding the year. Add a short review memo for judgments such as worker status, corporate exemption, payment-method exclusion, state filing, or unusual timing. That memo is often more useful than another unlabeled spreadsheet.

Common mistakes

• Using 7.65 percent on all wages. Social Security stops at its wage base while Medicare continues.
• Matching Additional Medicare. The employer does not match the additional 0.9 percent.
• Combining employees for the threshold. Apply wage bases and Additional Medicare to each employee.
• Treating pretax as one category. A deduction can have different treatment for income tax and FICA.
• Confusing deposits with returns. Complete both and reconcile.
• Using net pay for Form 941. Report tax bases and taxes from gross payroll detail.
• Ignoring third-party sick pay. Coordinate reporting responsibility and W-2 treatment.

Final review before filing

Confirm the form and revision year, taxpayer identities, dollar fields, payment categories, withholding, filing channel, recipient statement, state obligations, due dates, and approval. Compare the final output with the source reconciliation rather than reviewing the form in isolation. If software recalculates an amount after an edit, rerun the tie-out.

Keep preparation, filing, and acceptance as three separate statuses. A draft can be complete but unfiled; a transmission can be sent but rejected; a federal return can be accepted while a state return is still missing. This status discipline prevents a polished PDF from being mistaken for finished compliance work.

How to handle a discrepancy

When a source form, ledger, payroll report, or software preview disagrees with another record, stop before filing and identify which amount represents the underlying transactions. Trace the difference by vendor or employee, date, invoice or payroll run, payment channel, and account. Common causes include a payment posted to the wrong year, a void recorded after a report was generated, a card payment included with checks, a duplicate import, an incorrect taxpayer name, or a late adjustment. Record the explanation and the correcting entry or form request.

Do not erase the trail by overwriting the original report. Save the first version, the reconciliation, the corrected version, and the approval. If a third party supplied an incorrect information return, request a formal correction and retain the correspondence. If a return was already transmitted, use the current correction procedure for that form and channel. A corrected recipient copy without a corresponding agency correction can leave the records inconsistent.

Federal filing is only one layer

Federal acceptance does not settle state or local obligations. A state may use a different threshold, worker test, filing portal, account number, transmittal, or due date. Some states receive eligible information through a combined program, while others require a direct submission. Verify the jurisdictions connected with the payer, recipient, employee, work location, withholding, and business activity. Save state confirmations separately so they are not hidden behind the federal acceptance.

Make next year easier

Turn the year-end work into a monthly control. Collect identity forms during onboarding, code payment methods consistently, reconcile payroll and vendor activity each month, and flag vendors or income streams that need special treatment. Schedule a fall review of missing forms, classification questions, state registrations, and electronic-filing access. By year-end, the team should be validating a maintained file instead of reconstructing twelve months of transactions under a deadline.

Practical implementation notes

Rate table

Record rate, base, source, effective date, software update, and test payroll.

Accumulator report

Review employees near wage and benefit thresholds.

Quarterly tie-out

Reconcile registers, deposits, Form 941, books, and agency accounts.

Year-end tie-out

Compare four quarters with W-2/W-3 employee and employer control totals.

Deeper planning points

Taxable benefits

Add benefits early enough for withholding. Review personal vehicle use, group-term life, awards, moving costs, and other fringe benefits before the last payroll.

Pretax deductions

Document treatment by tax base. A cafeteria-plan item, retirement deferral, HSA contribution, or other deduction may reduce some wage boxes but not others.

Tips

Allocated and reported tips have special payroll steps. Coordinate employee tip reports, withholding capacity, uncollected tax, employer credit analysis, Forms 941, and W-2 boxes.

Sick pay

Determine employer and third-party responsibilities. Reconcile payer statements, tax withholding, employer match, Form 941 reporting, and W-2 responsibility.

Corrections

Fix payroll before forms. Identify employee and employer amounts, repayment or collection, quarter, amended return, W-2c, state effect, and accounting entry.

Multiple payroll systems

Combine annual accumulators deliberately. A midyear conversion must carry employee-level Social Security and Medicare wages and taxes so bases do not restart.

Owner-employees

Entity rules affect compensation. Corporate officers who perform services are generally employees, subject to limited exceptions and reasonable-compensation considerations.

Notices

Match agency periods to payroll evidence. Reconcile the notice, return, deposits, amendments, and IRS account before paying or changing a future payroll.

Wage-base crossing

Test the payroll where an employee reaches the annual limit. Recalculate year-to-date Social Security wages before the run, apply tax only to remaining covered wages, and confirm the next payroll stops regular Social Security while Medicare continues. Review imported prior wages and manual checks.

Additional Medicare threshold

Withholding begins only after wages from that employer exceed $200,000. Do not adjust the payroll threshold for filing status, spouse wages, or an employee request. The employee reconciles the final liability on the individual return; the employer applies the statutory withholding trigger.

Deposit schedule

Payroll frequency does not determine federal deposit frequency. Document the lookback-period calculation, monthly or semiweekly status, the $100,000 next-day rule, new-employer treatment, and bank settlement. Keep EFTPS confirmation and trace every deposit to payroll liability.

Form 941 reconciliation

Compare tax bases, not only the balance due. Tie federal withholding, Social Security wages and tax, Medicare wages and tax, Additional Medicare withholding, adjustments, deposits, and prior-period corrections to payroll and the general ledger.

Form W-2 mapping

Employee tax boxes should explain the annual return totals. Reconcile boxes 3 and 4 for Social Security, boxes 5 and 6 for Medicare, box 1 federal wages, box 2 withholding, benefit codes, and state fields. Investigate differences instead of forcing W-3 totals.

Midyear conversion

Carry employee-level accumulators into the new system. Load quarter-to-date and year-to-date wages and taxes, including Social Security and Medicare bases, taxable benefits, voids, and off-cycle checks. Run a parallel calculation before relying on the first live payroll.

Overwithholding and underwithholding

Correct payroll promptly using current procedures. Determine whether repayment or collection is permitted, which quarter is affected, whether Form 941-X or W-2c is needed, and how employee consent, state tax, accounting, and provider records must change.

Record retention

Preserve the source behind every FICA number. Keep employee setup, earnings, time, benefits, deduction taxability, payroll registers, deposits, returns, amendments, W-2 files, acceptance, notices, and review evidence under the applicable federal and state retention schedule.

Successor employers

An acquisition can affect wage-base treatment and reporting. Review the transaction structure, effective date, predecessor and successor EINs, employee transfers, payroll-return allocation, and W-2 responsibility. Do not combine wages merely because a payroll system can import them.

Multiple work states

FICA remains federal, but the full paycheck needs jurisdiction control. Track physical work locations, residence, reciprocity, unemployment state, local taxes, paid leave, and effective dates. Reconcile federal FICA independently from state wage bases and deductions.

Household and agricultural workers

Special thresholds and return workflows can apply. Review Schedule H, Form 943, cash-wage thresholds, worker categories, and state rules rather than forcing every payment into ordinary Form 941 payroll or contractor reporting.

Payroll service oversight

Automation does not remove employer responsibility. Verify rate updates, prior wages, tax debits, filed returns, agency acceptance, notices, and year-end forms. Maintain agency access and downloaded records so the employer can prove compliance if the provider relationship ends.

Cash forecasting

FICA liabilities should never be treated as available operating cash. Forecast net pay, employee withholding, employer match, benefit funding, unemployment taxes, and deposit dates for every payroll. Reconcile the liability account after each deposit and investigate stale balances.

Annual control memo

Document the rules and evidence used for the year. Record the Social Security wage base, rates, Additional Medicare trigger, deposit status, return assignment, software version, test payroll, reviewer, and official-source dates. Attach the memo to the first-quarter setup and year-end reconciliation so another payroll specialist can reproduce the configuration and understand every exception without making unsupported assumptions later independently.

For the next layer of context, see this related guide, the companion reporting article, and the connected workflow.

If the form, books, and filing status do not agree, Steady can help reconcile the source data and prepare a clean filing package through its specialist service.