Impuestos sobre nómina en Estados Unidos: payroll taxes explained (FICA, federal withholding, and real numbers)

If you’ve ever looked at your pay stub and thought, “Where did my money go?” — you’re not alone. US payroll can feel like a magic trick: you work 40 hours, you do the math in your head, and then your deposit is way smaller.

This guide breaks down impuestos sobre nómina en Estados Unidos (payroll taxes in the US) in plain English, with real percentages and a real example so you can sanity-check your paycheck.

Quick Summary: what “payroll taxes” usually means

On most US pay stubs, the money that comes out of your gross pay falls into three buckets:

• Income tax withholding (federal, and sometimes state/local)
• FICA taxes (Social Security + Medicare) — these show up even if your federal withholding is $0
• Other deductions (health insurance, 401(k), HSA, etc.) — not taxes, but they reduce your net pay

What counts as “payroll taxes” (and what doesn’t)

Here’s a clean way to read your pay stub:

The key idea: taxes and deductions both reduce net pay, but they behave differently. Taxes depend on rules and your W-4. Deductions depend on what you signed up for.

FICA explained: Social Security + Medicare (with exact rates)

FICA is the most predictable part of your paycheck because the rates are mostly fixed.

Social Security (6.2% up to a wage cap)

Social Security withholding is 6.2% of your wages until you hit the annual wage base cap. After you cross the cap, the Social Security line usually drops to $0 for the rest of the year.

Medicare (1.45% with no cap, plus an extra 0.9% at higher income)

Medicare withholding is 1.45% of wages with no wage cap. There’s also an Additional Medicare Tax of 0.9% that kicks in at higher income thresholds (your employer starts withholding it after you pass the threshold during the year).

Federal withholding: why your paycheck tax is an estimate

Federal income tax on your paycheck is withholding — money your employer sends to the IRS to prepay what you’ll owe on your tax return.

Two important truths:

• Withholding is an estimate. It’s based on your W-4, pay frequency, and IRS tables. It’s trying to land you close to $0 owed / $0 refund at tax time.
• Your actual tax depends on your whole year. Credits, deductions, second jobs, spouse income, side income, and bonuses all change the final number.

This is why people can have two coworkers earning the same hourly rate and still see different federal withholding. One might have a different filing status, dependents, or extra withholding on their W-4.

State and local taxes: why Texas vs California feels so different

State rules can change your take-home a lot.

• Some states have no state income tax (that’s why Texas paychecks often feel bigger).
• Some states have state income tax withholding plus special payroll programs (for example, California can include items like SDI depending on your situation).

If you’re comparing offers in different states, don’t guess. Run both states through USAPaycheck: Texas vs California. The difference can be thousands per year on the same salary.

A real example: $52,000 salary (single) — where the money goes

Let’s use a clean example: $52,000/year (about $1,000/week gross) for a single filer, paid biweekly (26 paychecks). We’ll keep it simple: no kids, no extra withholding, and no pre-tax benefits.

Gross per paycheck: $52,000 ÷ 26 = $2,000.00

Now the predictable part — FICA:

• Social Security (6.2%): $2,000 × 0.062 = $124.00
• Medicare (1.45%): $2,000 × 0.0145 = $29.00
• Total FICA: $153.00 per paycheck

Federal withholding varies by W-4 and tables, but for a middle-income single worker with no special settings, a common ballpark might be roughly $150–$220 per biweekly paycheck (this is not a promise — it’s a sanity-check range).

If you live in a state with income tax, your net pay will be lower. If you have pre-tax deductions (health insurance, 401(k)), your net pay might be lower — but your federal withholding might also be lower.

Why your paycheck changes (even if your salary didn’t)

These are the most common reasons your net pay jumps around:

• Bonus or overtime: payroll software can withhold differently on supplemental wages
• New year changes: withholding tables update, benefit premiums change, and you might reset caps/limits
• You updated your W-4: a single checkbox can change withholding a lot
• Pre-tax deductions changed: joining a health plan or increasing your 401(k) changes taxable wages

How to Put This to Work (3 steps)

Step 1: Match your pay stub math. Take one paycheck and verify FICA: gross wages × 7.65% (roughly). If it’s close, you’ve ruled out a big category of errors.

Step 2: Run your state estimate. Use your state calculator (start with Texas or California as examples) and compare the estimate to your net pay. If the estimate is consistently higher/lower, your W-4 or benefits are the likely reason.

Step 3: Decide what you want: bigger paychecks or a bigger refund. If you always get a huge refund, you might be over-withholding. If you owe every year, you might be under-withholding. Adjusting a W-4 can fix that — but do it carefully, and track the next 2–3 paychecks.