Paystub Deductions Guide for New U.S. Workers

Your offer letter says $90,000, but your first deposit is much smaller than the number you used to plan rent, remittances, and savings. That gap is not necessarily a payroll mistake. This paystub deductions guide explains where the money goes, which deductions are required, and which ones you may be able to change.

A paystub is the record attached to each paycheck. It shows your earnings for the pay period, taxes withheld, benefit costs, other deductions, and your net pay - the amount that reaches your bank account. For workers new to the U.S., it is also an early warning system. A wrong tax setup, an unwanted benefit election, or a missing work authorization update can affect every paycheck until you correct it.

Start with gross pay, not net pay

Your gross pay is your pay before deductions. If you are paid a salary, it is usually your annual salary divided by the number of pay periods. Biweekly payroll means 26 checks per year, while semimonthly payroll means 24 checks. Those schedules can produce different gross-pay amounts even when the annual salary is identical.

Hourly workers should check the hours, hourly rate, overtime rate, shift differential, bonuses, and commissions shown on the stub. Keep in mind that a sign-on bonus or relocation payment may be taxed through payroll, so the deposited amount can look surprisingly low.

Your net pay is gross pay minus all deductions. It is the number to use for your monthly cash-flow plan, not your annual salary divided by 12. If you are building a U.S. budget for the first time, use two or three actual paystubs before deciding what you can safely commit to for housing or loan payments.

Paystub deductions guide: the required taxes

Most employees see several tax lines. The labels vary by payroll provider, but the underlying categories are usually the same.

Federal income tax withholding

Federal income tax withholding may appear as “Federal Withholding,” “FIT,” or “Federal Income Tax.” Your employer sends this money to the IRS as a prepayment toward your federal income tax bill.

The amount depends largely on the Form W-4 you gave your employer, your pay frequency, and taxable wages for that paycheck. It is not a flat percentage of your salary. A bonus, overtime payment, or stock-related payment can change withholding for one period.

Withholding also is not your final tax calculation. When you file a federal tax return, you compare the total tax you owe with the amount already withheld. You may receive a refund or owe additional tax.

Immigration status can matter here. For example, some F-1 and J-1 workers who are nonresident aliens for tax purposes have special Form W-4 instructions. A tax treaty claim, where available, can also affect payroll treatment, but it must be properly documented. Do not assume that holding an F-1, J-1, H-1B, or TN visa automatically gives you a treaty benefit. Tax residency, country of residence, income type, and documentation all matter.

Social Security and Medicare taxes

These deductions are often grouped as FICA, short for the Federal Insurance Contributions Act. They generally include Social Security tax and Medicare tax. Unlike federal income tax withholding, these taxes are usually calculated as a set percentage of eligible wages, subject to annual rules and limits.

Most employees in the U.S. pay FICA taxes, including many H-1B, L-1, TN, E-2, and green-card holders. Your employer generally pays a matching share separately, which will not reduce the gross pay shown on your stub.

There is an exception that often matters to international students and exchange visitors. Certain F-1, J-1, M-1, and Q-1 workers who remain nonresident aliens for tax purposes may be exempt from Social Security and Medicare taxes on qualifying employment. This is not a permanent visa-based exemption. Once tax residency changes, or if the work does not qualify, FICA may apply.

If you believe FICA was withheld incorrectly, raise the issue with payroll promptly. Employers can often correct an error more easily within the same calendar year. Save your paystubs, visa documents, I-94 history, and any communication with payroll.

State and local income taxes

Many states collect income tax, and some cities or counties do too. On your paystub, you may see labels such as “CA SIT,” “NY State Tax,” or “Local Tax.” Other states have no broad wage-based income tax, but that does not mean there are no payroll deductions.

Your work location matters. Remote work can create confusing results when you live in one state and work for an employer based in another. If you moved during the year, check that payroll has your current home and work address. A mismatch can lead to incorrect state withholding and a more complicated tax return.

Benefits and voluntary deductions

Not every deduction is a tax. Many are tied to benefit choices you made during onboarding or open enrollment.

Health, dental, and vision insurance premiums are common examples. The amount may be deducted pre-tax, meaning it reduces wages used for certain taxes, or after-tax, meaning it does not. The distinction affects your taxable income and can explain why two employees with similar salaries have different take-home pay.

Retirement contributions are another frequent line item. A traditional 401(k) contribution usually reduces current federal taxable wages, while a Roth 401(k) contribution is generally made after federal income tax. Both can be valuable, but the right choice depends on your current income, future plans, and whether you expect to stay in the U.S. long term. Your visa status does not automatically prevent you from participating if your employer offers the plan, although plan-specific eligibility rules apply.

Other possible deductions include health savings account contributions, flexible spending accounts, commuter benefits, life insurance, disability coverage, union dues, charitable giving, parking, and repayment of an employer advance. Read unfamiliar labels rather than assuming they are mandatory. Some benefits renew automatically unless you actively change your election.

Pre-tax versus after-tax deductions

This distinction is one of the most useful parts of a paystub to understand.

A pre-tax deduction is taken out before one or more taxes are calculated. Depending on the benefit and applicable law, it may reduce federal income-tax wages, state taxable wages, Social Security wages, Medicare wages, or some combination. Health-plan premiums and traditional 401(k) contributions are common examples, but the treatment is not identical for every benefit.

An after-tax deduction comes out after taxes are calculated. Roth 401(k) contributions and some insurance or voluntary benefits may be after-tax. After-tax does not mean bad. It simply means the contribution does not reduce taxes now.

Look for wage boxes or year-to-date figures on the stub. If gross pay is $4,000 but federal taxable wages are lower, a pre-tax benefit may be the reason. Payroll software can make these calculations hard to follow, but the math should be internally consistent.

Read the year-to-date column

The current-pay-period column tells you what happened this check. The year-to-date, or YTD, column tells you what has happened since January 1. Both matter.

Use YTD figures to check whether retirement contributions are tracking toward the amount you intended to save and whether your insurance deductions started on the correct date. It also helps you notice a deduction that continued after it should have stopped.

Near the end of the year, compare your final paystub with your Form W-2 when it arrives. Gross pay, taxable wages, and deductions do not always match one-for-one because of pre-tax benefits and other payroll rules. But major unexplained differences deserve a question to payroll.

What to do when something looks wrong

Do not wait until tax filing season. First, compare the paystub with your offer letter, benefit elections, time records, and prior paystub. A one-time difference may be a bonus, a benefit start date, or a payroll correction. A repeated difference is more likely to be a setup problem.

Contact your employer’s payroll or HR team in writing. State the pay date, deduction name, amount, and why you believe it is incorrect. Ask what document or system setting produced the deduction and whether a correction will appear on the next payroll.

For tax questions connected to nonresident status, treaty claims, or the student and exchange visitor FICA exception, payroll staff may need support from their tax department. Provide accurate immigration and arrival-history information, but remember that payroll can correct withholding only under applicable rules. A payroll correction does not replace the need to file the right tax return.

Finally, keep every paystub, especially in your first year in the U.S. They are more than proof of income for an apartment application or credit card review. They show how your job, benefits, tax status, and financial choices are working together. Once you can read them confidently, each paycheck becomes a clearer tool for building the life you came here to create.