Pay Stub Abbreviations: Complete Glossary of FED, FICA, OASDI, SUI, and More

Why Pay Stub Abbreviations Are Cryptic

Pay stubs are dense with three- and four-letter abbreviations: FED, FICA, OASDI, SUI, SUTA, FUTA, HSA, FSA, 401K. The shorthand isn't there to confuse anyone. Legacy payroll systems built in the 1980s and 1990s used fixed-width fields and printed on 3-inch dot-matrix receipts that physically couldn't fit "Federal Income Tax Withholding." So the major payroll vendors locked in on three- and four-letter codes, and the IRS, SSA, and DOL embedded the same codes in their guidance, which kept everything aligned across employers. Modern systems have all the space in the world; the abbreviations stuck anyway because every payroll department in the country already reads them at a glance.

Different vendors use slightly different labels for the same thing. One employer's stub says "SS," another says "SSOC," a third spells out "Social Security." All three mean the OASDI tax withheld at 6.2%. Once you can read the standard codes, ADP, Gusto, Paychex, QuickBooks, and Workday stubs all become legible.

Federal and State Income Tax Abbreviations

Federal income tax shows up as FED, FIT, or FITW depending on the payroll vendor. It's the amount withheld each pay period based on your W-4 entries and the IRS Publication 15-T withholding tables, scaled to your gross pay. For 2026, the single-filer standard deduction is $16,100 and the 10% and 12% brackets cover most middle-income wages (10% up to $12,400 of taxable income, 12% up to $50,400, then 22% up to $105,700).

State income tax appears as ST or SIT, often qualified with state codes such as CA or NY. Nine states impose no individual income tax of any kind: Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming, and New Hampshire. New Hampshire's Interest & Dividends Tax was fully repealed effective January 1, 2025, so NH wages haven't been subject to any state income tax since then. A $0 state line in those states is correct. A $0 line in California or New York usually means a payroll setup error worth catching early.

Local income tax shows as LOC or LOCAL. Philadelphia residents pay 3.74% effective July 1, 2025 (non-residents 3.43%). Columbus, Ohio is 2.5% on residents and earners. New York City has its own resident tax. If you work in a city with a local wage tax and don't see a corresponding line on the stub, that's worth surfacing to HR before April.

FICA, Social Security, and Medicare Abbreviations

FICA (Federal Insurance Contributions Act) is the statute that authorizes Social Security and Medicare withholding. You rarely see "FICA" as a single line on a stub; the two taxes appear separately and together total 7.65% of gross (6.2% Social Security plus 1.45% Medicare). Social Security in formal SSA terminology is OASDI (Old-Age, Survivors, and Disability Insurance); Medicare in formal CMS terminology is HI (Hospital Insurance).

Social Security tax appears as SS, SSOC, SOCSEC, or spelled out. The 2026 wage base is $184,500: a worker earning $200,000 pays Social Security on $184,500 only, with $15,500 of wages free of OASDI for the year. Mid-year job changes complicate the cap because each employer counts its own wages independently. If you worked at one employer earning $130,000 through August and a second earning $80,000 from September on, neither employer's payroll system reaches the $184,500 cap on its own, but your combined wages do. The mechanism for recovering the over-withheld portion is Schedule 3, Line 11 on the federal return ("Excess Social Security and tier 1 RRTA tax withheld"); each employer continues withholding through the end of the year because they can't legally coordinate.

Medicare tax appears as MED, MEDI, HI, or MEDICARE. There's no wage cap; 1.45% applies to every dollar. High earners (over $200,000 single, $250,000 MFJ) see an additional 0.9% line labeled MEDI ADD or ADD MEDI. The surtax is employee-only and has no employer match. HI is the official program name and covers inpatient hospital stays, skilled nursing, and hospice.

Unemployment and Employer-Related Abbreviations

SUTA (State Unemployment Tax Act) and FUTA are employer unemployment taxes. In most states, employer unemployment tax should not appear as an employee deduction. The confusing part is that a few states also require employee-funded unemployment or disability-style contributions, and some payroll systems label those lines with SUI-like abbreviations. If you see SUI as a deduction in a state such as Alaska, New Jersey, or Pennsylvania, ask payroll whether it is the employee unemployment contribution rather than an employer tax shifted to you. If the line is truly employer SUTA/FUTA passed through to the worker, that is a payroll problem worth escalating.

FUTA (Federal Unemployment Tax Act) is employer-only. The rate runs 6% on the first $7,000 per employee per year, but employers get credits for state unemployment taxes paid, which lowers their effective federal bill. This incentivizes proper state unemployment payment.

SDI (State Disability Insurance) appears in CA, HI, NJ, NY, and RI. It's employee-funded—unlike FUTA and SUTA, it comes out of your check. California's 2026 rate is 1.3% (up from 1.2% in 2025), and as of January 2024 there is no wage cap on California SDI — every dollar of wages is subject. SDI covers short-term disability for non-work-related illness or injury.

Retirement Plan Abbreviations

401K (or 401(k)) is a pre-tax retirement plan. Named after Section 401(k) of the Internal Revenue Code, contributions reduce your current taxable income. Typical allocations run 3–6% of gross pay; the 2026 annual cap is $24,500 for workers under 50.

ROTH (or RTH) means Roth 401(k) or Roth IRA. Unlike traditional 401(k)s, Roth is post-tax—no current deduction, but tax-free withdrawals later. Many employers offer both; you'll see separate lines if you fund both types.

IRA (or TRAD IRA) shows up if you fund an IRA outside your employer plan. Individual Retirement Account contributions can be pre-tax or post-tax depending on income and plan access.

Health, Dependent Care, and Flexible Spending Abbreviations

HSA (Health Savings Account) pairs with a qualifying high-deductible health plan and is triple-tax-advantaged: contributions go in pre-tax, earnings grow tax-free, and withdrawals for qualified medical expenses come out tax-free. 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage, with a $1,000 catch-up at age 55. Balances roll over indefinitely.

FSA (Flexible Spending Account, also called health FSA) covers out-of-pocket medical costs, copays, and deductibles on a pre-tax basis. Unlike an HSA, the FSA is use-it-or-lose-it by the plan year deadline, though plans can allow a carryover (up to $680 for 2026 under Rev. Proc. 2025-32). The 2026 contribution limit is $3,400, up from $3,300 in 2025.

DCFSA (Dependent Care Flexible Spending Account) is the pre-tax account for child care, elder care, daycare, preschool, adult day care, and in-home nanny costs. The One Big Beautiful Bill Act raised the annual DCFSA limit to $7,500 effective January 1, 2026 (up from $5,000, where the cap had sat for nearly forty years). MFS filers are limited to half that amount. Employers must amend their Section 125 plan documents to adopt the higher cap, so it's worth confirming with benefits before assuming the new limit is in effect at your plan.

HC and DEN mean health care (medical) and dental. "HC PRE" or "DEN PRE" are Section 125 pre-tax premiums; they reduce federal taxable wages, FICA wages, and (in most states) state taxable wages. "HC POST" or "DEN POST" are after-tax premiums; they cut take-home but don't reduce tax.

Life Insurance and Voluntary Benefit Abbreviations

GTL (Group Term Life Insurance): if coverage exceeds $50,000, the excess counts as imputed income. The IRS calculates this via published tables and adds it to your taxable wages. It's not a deduction—it's a taxable addition, so it lives outside the deductions section.

STD (Short-Term Disability) and LTD (Long-Term Disability) are voluntary insurance. Most employers charge post-tax premiums (union plans sometimes allow pre-tax). If you claim benefits: post-tax premium = tax-free benefit; employer-paid premium = taxable benefit.

VSP, MetLife, Principal, and similar vendor names show up as deductions for voluntary life insurance, accidental death/dismemberment, or critical illness. These are optional and appear only if you enrolled.

ADD (Accidental Death and Dismemberment) pays a benefit if you're killed or seriously injured in an accident.

Other Common Abbreviations

OASDI (Old-Age, Survivors, and Disability Insurance) is the formal SSA name for Social Security. Older stubs and government documents tend to use it; modern systems usually just say "SS." OASDI WB CAP refers to the wage base cap, set at $184,500 for 2026. The cap applies per worker, but each employer withholds independently up to that ceiling, which is why workers with two or more jobs in the same year often end up over-withheld and recover the excess via Schedule 3, Line 11.

IMPUTED INC (or "IMPUTED") is non-cash benefits the IRS treats as taxable wages. Beyond GTL, this covers company car personal use, domestic partner health benefits, or other fringe perks. It increases your W-2 taxable wages but doesn't show up as spendable cash.

FICA EE and FICA ER mean FICA Employee and Employer. Most workers see only FICA EE (the 7.65% employee share). Some stubs show FICA ER informational—the employer's matching 7.65% contribution.

GRO (or GROSS) = pay before deductions. NET = your actual take-home. HOURS or HRS = hours worked. RATE = hourly wage. REG = regular time, OT = overtime (1.5x), DOUBLE = double time (2x).

CHK (or CK) = check number. DD = Direct Deposit. ACH = Automated Clearing House, the network handling direct deposits.

What to Do if You See an Abbreviation You Don't Recognize

Stub systems vary—vendors sometimes use non-standard codes. Don't recognize a line item? Email HR: "What does GTM mean on my current stub?" Quick answer, usually. Your employer must provide clear pay stub info; unexplained abbreviations are worth flagging.

Cross-reference with your W-2. Box 1 = total wages, Box 2 = federal tax, Box 3 = Social Security wages, Box 4 = SS tax, Box 5 = Medicare wages, Box 6 = Medicare tax. Your YTD figures should match the W-2 boxes, confirming abbreviations are being used consistently.

Different platforms label items differently. ADP leans toward plain-text labels; QuickBooks Payroll uses more codes. Reading your stub line by line lets you spot errors and verify deductions match the math. Creating stubs for your own business? Stick to industry-standard abbreviations. Landlords and lenders see hundreds of stubs; unfamiliar shorthand raises red flags.

Summary: Key Abbreviations at a Glance

Quick reference. Federal and state income tax show up as FED, FIT, or FITW for federal and SIT or ST for state, with LOCAL or city codes (PHL, NYC, CMH) for local wage taxes. FICA breaks into SS (or OASDI) for Social Security and MED or HI for Medicare, with ADD MEDI for the high-earner surtax. FUTA and employer SUTA should not be passed through as employee deductions, though a few states have separate employee unemployment or disability contributions that may use similar labels. SDI (CA, HI, NJ, NY, RI) is employee-funded and does appear on stubs. Retirement shows as 401K, ROTH, and sometimes IRA. Health and dependent-care accounts show as HSA, FSA, and DCFSA. Insurance lines appear as GTL (Group Term Life, imputed over $50,000 in coverage), STD, LTD, and ADD. Pay elements are GRO or GROSS, NET, HOURS, RATE, REG, OT. Payment method is CHK, DD, or ACH.

The fastest way to keep these straight is to verify your stub against your W-2 once a year and reconcile any code that looks unfamiliar with HR. The next time you see a paycheck with a new label, you'll know whether it's pre-tax, post-tax, or imputed without having to ask. (And if you're creating stubs for your own business, sticking to the standard codes is what makes a stub look legitimate to a landlord or lender.)