What Is FICA on My Paycheck?

FICA commonly appears as separate Social Security and Medicare withholding lines. Those lines are calculated from program-specific taxable wages, which can differ from cash gross pay and from each other.

This page explains the inputs a paycheck estimate needs. It does not publish certified 2026 rates or thresholds because the certification archive does not yet contain the required current federal source family. Verify the current figures and special employer rules in official IRS and Social Security guidance.

Social Security and Medicare use different wage rules

Social Security withholding uses Social Security-taxable wages and an annual wage base. Medicare withholding uses Medicare-taxable wages and has separate regular and additional withholding rules. Noncash taxable compensation and qualifying payroll deductions can make either taxable-wage amount differ from the cash deposited to you.

A pay-stub label such as gross pay or year-to-date earnings is therefore not automatically the correct input for both programs. Use the explicit program wage lines from the employer record when they are available.

Use employer-specific year-to-date wages

For a Social Security wage-base calculation, enter Social Security-taxable YTD wages for the employer scope that applies to the paycheck. For Additional Medicare withholding, enter Medicare-taxable YTD wages paid by that employer. The current paycheck may cross a threshold, so only part of the current wages may receive a particular treatment.

Keep each Work Source's YTD inputs separate unless current official guidance establishes a different payroll scope. TakeHome IQ does not resolve employer aggregation, predecessor, successor, or related-employer status.

Employer withholding is not final Additional Medicare liability

TakeHome IQ's Additional Medicare result is a current-paycheck withholding estimate based on the employer-specific Medicare-taxable YTD wages you enter. It is not a calculation of final federal return liability. Verify current federal guidance for the applicable withholding trigger, return threshold, and any combined-income rule.

Deduction labels are not enough

A deduction reduces Social Security or Medicare taxable wages only when the deduction and payroll-plan treatment support that result. Traditional and Roth retirement deductions, HSA or FSA payments, health premiums, and custom deductions should not be assigned a FICA treatment from the display name alone.

Confirm the treatment from the plan and payroll record. State income-tax treatment is a separate question and should not be inferred from FICA treatment.

How TakeHome IQ estimates FICA withholding

TakeHome IQ shows separate Social Security, Medicare, and Additional Medicare result lines from the configured paycheck inputs. For the strongest current-period estimate, enter employer-specific Social Security-taxable and Medicare-taxable YTD wages. Without those explicit fields, a wage-base or threshold result may be incomplete.

The app calculates the current paycheck. It does not forecast the future paycheck on which a cap will be reached, resolve a special employer-aggregation rule, or calculate final federal return liability.

What to verify before relying on the estimate

• Current federal Social Security and Medicare rates and thresholds.
• Current-period Social Security- and Medicare-taxable wages.
• Employer-specific taxable YTD wages and any special employer aggregation rule.
• Qualifying payroll-plan treatment for each deduction.
• Whether the question is paycheck withholding or final return liability.

Frequently asked questions