To read a pay stub accurately, divide the document into three distinct structural sections: Gross Earnings (the total hourly wages or base salary earned during the pay period), Deductions (statutory federal, state, and payroll taxes plus voluntary pre-tax and post-tax employee benefit withholdings), and Net Pay (the final “take-home” dollar amount deposited into your checking account). Decoding unfamiliar acronyms—such as OASDI (Social Security), FED MED/EE (Medicare), and pre-tax insurance shields—enables you to verify payroll accuracy, spot costly withholding errors, and optimize your annual tax liability.
Key Takeaways
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The Three Master Sections: Gross Pay (total income) minus Deductions (taxes & benefits) equals Net Take-Home Pay. -
Mandatory FICA Taxes: Social Security (OASDI at 6.2% up to the 2026 cap of $176,100) and Medicare (1.45% plus 0.9% high-earner surtax). -
Pre-Tax vs. Post-Tax Advantage: Pre-tax deductions (Traditional 401k, HSA, health insurance premiums) lower taxable gross income; post-tax deductions (Roth 401k, garnishments) do not. -
Year-to-Date (YTD) Auditing: Tracking cumulative YTD figures helps verify that your payroll servicer halts Social Security withholding once the annual wage limit is reached.
The Anatomy of a Pay Stub: 3 Core Sections
Whether your employer utilizes ADP, Workday, Paychex, or Gusto, every earnings statement conforms to three universal accounting segments:
1. Earnings (Gross Pay)
This section documents all compensation generated during the pay period prior to any withholdings. It breaks out:
- Regular Hours & Rate: The total standard hours logged (e.g., 80.0 hours on a bi-weekly cycle) multiplied by your contractual base wage.
- Overtime Pay: Hours worked beyond 40 per week, typically compensated at 1.5 times your standard hourly rate (“time-and-a-half”).
- Paid Time Off (PTO / Vacation / Sick): Compensated leave hours accrued or redeemed during the cycle.
- Supplemental Pay: Performance bonuses, commissions, tips, shift differentials, or stipends.
2. Deductions & Withholdings
The deductions module contains statutory government obligations and voluntary employee benefits. It is divided into:
- Tax Withholdings (Mandatory): Federal income tax, state income tax, local municipal taxes, and FICA payroll taxes.
- Pre-Tax Benefit Deductions (Voluntary): Employer-sponsored healthcare, dental, vision, Health Savings Accounts (HSA), Flexible Spending Accounts (FSA), and traditional pre-tax retirement plan contributions.
- Post-Tax Deductions (Voluntary or Mandated): Roth 401(k) contributions, disability insurance, union dues, charitable workplace giving, and court-mandated wage garnishments.
3. Net Pay
Net Pay is the bottom line: your total Gross Earnings minus all statutory taxes and voluntary deductions. This is the exact amount transferred via direct deposit to your bank account or printed on your physical payroll check.
Mandatory Payroll Taxes Explained: What Everyone Sees
Every American W-2 wage earner sees four primary statutory tax deductions on their pay stub:
| Stub Label / Acronym | Official Name | 2026 Statutory Rate | 2026 Annual Wage Base Cap |
|---|---|---|---|
| FIT / FED TAX | Federal Income Tax | Progressive (10% to 37%) based on Form W-4 | No wage cap |
| OASDI / SS / SOC SEC | Social Security (Old-Age, Survivors, and Disability Insurance) | 6.20% flat employee rate (matched by employer) | $176,100 (tax halts above this threshold) |
| FED MED / EE / MEDICARE | Medicare Hospital Insurance | 1.45% flat employee rate (matched by employer) | No wage cap |
| ADD MED / MED2 | Additional Medicare Surtax | 0.90% surtax (employee-only, no match) | Applies on wages exceeding $200,000 (Single) / $250,000 (MFJ) |
| SIT / STATE TAX | State Income Tax | 0% (in TX, FL, WA, etc.) to 13.3% top marginal (in CA) | Varies by state statute |
Pre-Tax vs. Post-Tax Deductions: The Tax Shield Difference
Understanding whether a deduction is pre-tax or post-tax is essential for maximizing your take-home pay:
- Pre-Tax Deductions: These funds are subtracted from your gross earnings before income taxes are calculated. For example, if you earn $3,000 gross and contribute $300 to a Traditional 401(k), your federal taxable income drops to $2,700. In a 22% tax bracket, that $300 contribution saves you $66 in immediate income taxes. Pre-tax items include medical/dental insurance premiums (Section 125 cafeteria plans), 401(k)/403(b) contributions, and HSA deposits.
- Post-Tax Deductions: These items are withheld after all taxes have been computed on your full gross earnings. Examples include Roth 401(k) contributions (which grow tax-free and are withdrawn tax-free in retirement), voluntary supplemental life insurance, and child support or tax levy garnishments.
Audit Your Net Paycheck Withholding
Simulate how pre-tax 401(k) contributions, HSA deductions, and filing status changes impact your take-home pay.
Deduction Code Glossary: ADP, Workday, and Paychex Decoded
Payroll platforms rely on standardized abbreviations. Use this comprehensive reference table to decipher cryptic codes on your pay stub:
| Pay Stub Code | Full Description | Tax Category | Typical Provider / System |
|---|---|---|---|
| FIT / FED TAX | Federal Income Tax Withholding | Mandatory Tax | Universal (ADP, Workday, Gusto) |
| FICA OASDI | Federal Insurance Contributions Act – Social Security | Mandatory Tax (6.2%) | ADP / Paychex |
| FED MED/EE | Federal Medicare Employee Contribution | Mandatory Tax (1.45%) | ADP / Workday |
| SIT / SWT | State Income Tax / State Withholding Tax | Mandatory Tax | Universal |
| SUI / SDI | State Unemployment Insurance / State Disability Insurance | State Payroll Tax (CA, NY, NJ, etc.) | State specific |
| 401(k) / K401 / RET | Traditional Pre-Tax Retirement Contribution | Pre-Tax Voluntary | ADP / Paychex |
| ROTH / ROTH401 | Roth Post-Tax Retirement Contribution | Post-Tax Voluntary | Workday / ADP |
| HSA / HSAPRE | Health Savings Account Contribution | Pre-Tax Voluntary (Triple Tax Advantage) | Universal |
| FSA MED / FSA DEP | Flexible Spending Account (Healthcare / Dependent Care) | Pre-Tax Voluntary | Universal |
| MED PRE / HLTH | Employer Health Insurance Employee Share | Pre-Tax Cafeteria Plan | ADP / Workday |
| GTL / IMP TAX | Group Term Life Insurance (Imputed Income over $50k) | Taxable Fringe Benefit | Workday / ADP |
| GARN / LEVY | Court-Ordered Wage Garnishment (Debt/Support) | Post-Tax Involuntary | Universal |
Auditing Your YTD Totals: Spotting Common Payroll Errors
The Year-to-Date (YTD) column on your pay stub tracks your cumulative earnings and withholdings from January 1st through the current pay cycle. Reviewing your YTD figures protects you against two frequent payroll glitches:
- Social Security Cap Overage: Once your cumulative earnings exceed $176,100 (in 2026), your payroll system must cease deducting the 6.2% OASDI tax. If you switch jobs mid-year, both employers will withhold Social Security without knowing your prior earnings; you can claim the excess withholding as a credit on your annual Form 1040.
- Incorrect W-4 Withholding Status: If your federal withholding feels unusually low or high, verify your filing status and allowances listed on the stub header. If an employer accidentally inputs you as “Married Filing Jointly” when you are single, you will severely under-withhold and face an unexpected penalty at tax time.
Frequently Asked Questions
To understand deductions, separate them into two buckets: mandatory statutory taxes (Federal Income Tax, Social Security at 6.2%, Medicare at 1.45%, and State Income Tax) and voluntary employer benefits (health insurance, 401k retirement contributions, and HSA/FSA plans). Subtracting all deductions from your Gross Pay yields your final Net Take-Home Pay.
Pay stub codes are standardized accounting abbreviations: FIT stands for Federal Income Tax, OASDI stands for Old-Age, Survivors, and Disability Insurance (Social Security), FED MED/EE stands for Medicare employee share, SIT stands for State Income Tax, and 401(k) or RET represents retirement savings contributions.
Every US wage earner sees FICA mandatory deductions: Social Security (6.2% up to $176,100 in 2026) and Medicare (1.45% on all earnings). Almost all workers also see Federal Income Tax (FIT). Workers in states with income taxes will also see State Income Tax (SIT) and local disability or unemployment assessments.
A legitimate pay stub should feature a clear header with employer name, employee name, pay period dates, pay date, and tax filing status. It must clearly outline hours worked and pay rates, itemize each statutory tax deduction, list voluntary benefit withholdings, and display both current period totals and Year-to-Date (YTD) cumulative amounts.