Pre-Tax Deductions
Enter your payroll details, then click reconcile.
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What This Calculator Does
This payroll reconciliation calculator helps accountants, bookkeepers, payroll specialists, and business owners verify gross-to-net payroll calculations. It computes Social Security and Medicare (FICA) withholding using 2026 rates and wage bases, applies federal and state income tax withholding, and accounts for pre-tax and post-tax deductions including 401(k), health insurance, HSA, and FSA contributions. The tool also calculates employer-side payroll costs and tracks the Social Security wage base ($184,500 for 2026) to determine when withholding stops.
The Formula
Gross-to-net payroll follows a specific calculation order. Pre-tax deductions (401(k), health insurance, HSA) reduce taxable income before income tax withholding but do not reduce Social Security or Medicare wages (except for Section 125 cafeteria plan deductions). Social Security tax applies at 6.2% on wages up to the 2026 wage base of $184,500. Medicare applies at 1.45% with no wage limit. An additional 0.9% Medicare tax applies to wages over $200,000. The employer matches Social Security and Medicare but does not pay the additional Medicare tax.
Step-by-Step Example
Start with gross pay
Biweekly gross pay: $3,846.15 (annualized: $100,000).
Calculate FICA
Social Security: $3,846.15 x 6.2% = $238.46. Medicare: $3,846.15 x 1.45% = $55.77. YTD gross is $76,923 (under $184,500 wage base).
Apply withholding and deductions
Federal: $520. State: $180. 401(k): $288. Health: $150. HSA: $85. Total deductions: $1,517.23.
Calculate net pay
Net pay: $3,846.15 - $1,517.23 = $2,328.92. Effective deduction rate: 39.4%. Employer cost: $4,140.38.
Real-World Use Cases
Payroll Verification
Compare calculator results against payroll software output to identify discrepancies in tax withholding, deduction amounts, or net pay.
New Hire Paycheck Estimates
Provide employees with accurate take-home pay estimates during onboarding so they can plan their finances before their first paycheck.
Year-End Reconciliation
Verify that cumulative withholding matches expected amounts, especially for employees who crossed the Social Security wage base during the year.
Common Mistakes to Avoid
Forgetting that Social Security tax stops at the wage base. For 2026, withholding stops once cumulative wages reach $184,500. Paychecks after that threshold have higher net pay.
Not distinguishing between pre-tax and post-tax deductions. Pre-tax deductions (traditional 401(k), health insurance) reduce federal and state taxable income. Post-tax deductions (Roth 401(k), garnishments) do not reduce tax withholding.
Applying the additional Medicare tax to all employees. The 0.9% additional Medicare tax only applies to wages over $200,000. It is an employee-only tax; the employer does not match it.
Using the wrong pay frequency multiplier. Weekly: 52 periods. Biweekly: 26. Semi-monthly: 24. Monthly: 12. Using the wrong multiplier causes incorrect annualized income calculations.
Forgetting employer-side FICA costs. The employer pays matching Social Security (6.2%) and Medicare (1.45%) on top of gross pay. This increases the true cost of employment by approximately 7.65%.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides gross-to-net payroll estimates using 2026 federal FICA rates and wage bases. Actual payroll calculations depend on W-4 elections, state and local tax rules, benefit plan specifics, and employer policies. This tool is for verification and estimation purposes. Consult your payroll provider or tax professional for binding payroll calculations.
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