How to Calculate Payroll Withholdings Manually (2026)
Updated April 2026 · 12 min read
Quick Summary: To calculate an employee's net pay: Start with gross pay, subtract pre-tax deductions (401k, health insurance), then calculate and subtract federal income tax, FICA (7.65%), and state tax. The remainder is take-home pay. Use our payroll calculator to verify your manual calculations.
Step 1: Calculate Gross Pay
For Salaried Employees
Formula: Gross Pay per Period = Annual Salary ÷ Number of Pay Periods
Example: $60,000 ÷ 26 (bi-weekly) = $2,307.69 per paycheck
Example: $60,000 ÷ 26 (bi-weekly) = $2,307.69 per paycheck
| Pay Frequency | Pay Periods/Year | $60K Salary Per Period |
|---|---|---|
| Weekly | 52 | $1,153.85 |
| Bi-weekly | 26 | $2,307.69 |
| Semi-monthly | 24 | $2,500.00 |
| Monthly | 12 | $5,000.00 |
For Hourly Employees
Formula: Gross Pay = (Regular Hours × Rate) + (Overtime Hours × Rate × 1.5)
Example: (40 hrs × $25) + (5 hrs × $25 × 1.5) = $1,000 + $187.50 = $1,187.50
Example: (40 hrs × $25) + (5 hrs × $25 × 1.5) = $1,000 + $187.50 = $1,187.50
Step 2: Subtract Pre-Tax Deductions
Pre-tax deductions reduce your taxable income, lowering your tax burden:
| Deduction Type | 2026 Limit (Annual) | Tax Treatment |
|---|---|---|
| Traditional 401(k) | $23,500 | Exempt from federal + state income tax, NOT exempt from FICA |
| 401(k) Catch-up (50+) | +$7,500 | Same as 401(k) |
| Health Insurance (Section 125) | Varies | Exempt from federal, state, AND FICA |
| HSA (Self-only) | $4,300 | Exempt from federal, state, AND FICA |
| HSA (Family) | $8,550 | Same as HSA |
| FSA (Dependent Care) | $5,000 | Exempt from federal, state, AND FICA |
⚠️ Key Difference: 401(k) contributions reduce income tax but NOT FICA. Section 125 (health insurance) reduces BOTH income tax and FICA. This distinction matters for manual calculations.
Step 3: Calculate Federal Income Tax Source: IRS Pub 15-T
Use the IRS Percentage Method tables from Publication 15-T:
A. Determine Adjusted Wages
Formula: Adjusted Wages = Gross Pay - Pre-Tax Deductions - (Standard Deduction ÷ Pay Periods)
For single filer: $2,307.69 - $192.31 (6% of $60K 401k bi-weekly) - $604.17 ($16,100 ÷ 26) = $1,511.21
For single filer: $2,307.69 - $192.31 (6% of $60K 401k bi-weekly) - $604.17 ($16,100 ÷ 26) = $1,511.21
B. Apply 2026 Tax Brackets (Single Filer, Bi-Weekly)
| Bracket | Rate | Bi-Weekly Range |
|---|---|---|
| First $458 | 10% | $0 – $458 |
| $458 – $1,533 | 12% | $458 – $1,533 |
| $1,533 – $3,858 | 22% | $1,533 – $3,858 |
| $3,858 – $7,750 | 24% | $3,858 – $7,750 |
| $7,750 – $9,662 | 32% | $7,750 – $9,662 |
| $9,662 – $24,135 | 35% | $9,662 – $24,135 |
| Over $24,135 | 37% | $24,135+ |
Step 4: Calculate FICA Taxes
FICA Formula:
Social Security = Gross Pay × 6.2% (up to $184,500 annual wage base)
Medicare = Gross Pay × 1.45% (no wage cap)
Additional Medicare = 0.9% on wages over $200,000/year
Social Security = Gross Pay × 6.2% (up to $184,500 annual wage base)
Medicare = Gross Pay × 1.45% (no wage cap)
Additional Medicare = 0.9% on wages over $200,000/year
Example: $2,307.69 Bi-Weekly Pay
| Tax | Rate | Amount |
|---|---|---|
| Social Security | 6.2% | $143.08 |
| Medicare | 1.45% | $33.46 |
| Total FICA | 7.65% | $176.54 |
Step 5: Calculate State Income Tax
Each state has different rules. Common approaches include:
- Flat rate states (IL, PA, etc.) — Simply multiply by the flat percentage
- Progressive bracket states (CA, NY, etc.) — Use state-specific bracket tables
- No income tax states (TX, FL, WA, etc.) — Skip this step entirely
Step 6: Calculate Net Pay
Net Pay Formula:
Net Pay = Gross Pay - Pre-Tax Deductions - Federal Tax - FICA - State Tax - Post-Tax Deductions
Net Pay = Gross Pay - Pre-Tax Deductions - Federal Tax - FICA - State Tax - Post-Tax Deductions
Complete Example: $60,000/year, Single, Bi-Weekly, California
| Item | Amount |
|---|---|
| Gross Pay (bi-weekly) | $2,307.69 |
| 401(k) (6%) | -$138.46 |
| Federal Income Tax | -$171.69 |
| Social Security (6.2%) | -$143.08 |
| Medicare (1.45%) | -$33.46 |
| California State Tax (~4%) | -$86.84 |
| CA SDI (1.1%) | -$25.38 |
| Net Take-Home Pay | $1,708.78 |
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