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Tax season in the United States demands planning, organization, and careful reading of IRS rules. For Brazilians who recently arrived, long-time residents, Green Card holders, and temporary workers, understanding the American tax system is not just a legal requirement — it is a decisive financial planning step that can determine the size of your refund or tax bill at year’s end. This guide consolidates everything you need to know about filing for tax year 2025, whose regular deadline was April 15, 2026.
Who must file a tax return
The requirement to file a federal return depends on four main variables: filing status, annual gross income, age, and tax residency status. The IRS publishes the minimum income thresholds that trigger the filing obligation each year.
Tax year 2025 income thresholds
- Single filers under 65: gross income of $15,000 or more.
- Married filing jointly (both under 65): gross income of $30,000 or more.
- Married filing separately: $5 or more.
- Head of household: $22,500 or more.
- Qualifying widow(er): $30,000 or more.
For those 65 or older, these thresholds are higher. The IRS offers the Interactive Tax Assistant tool to check filing obligations on a case-by-case basis.
Tax residents and nonresidents
Tax residency in the US is not the same as immigration status. You are treated as a tax resident if you hold a Green Card or if you meet the Substantial Presence Test, which considers the weighted sum of days present in the United States over the past three years. Tax residents report worldwide income, with the option to credit taxes paid abroad. Nonresidents report only US-source income, using a separate form (Form 1040-NR).
Self-employed workers
Those who operate as freelancers, independent consultants, or small business owners must file if net profit from the activity exceeds $400 in the year. This threshold triggers not only the filing obligation, but also the self-employment tax, which covers Social Security and Medicare at a combined rate of 15.3%.
The American tax structure
Taxpayers face three layers: federal income tax, state income tax, and, in some cities, local income tax. Each has its own rates, rules, and forms.
Federal income tax
Applied by the IRS on taxable income, it is progressive, with seven brackets ranging from 10% to 37% for tax year 2025. Taxable income is calculated by subtracting either the standard deduction or itemized deductions from gross income, along with specific adjustments.
State and local tax
About 41 states levy a state income tax, with rates ranging from less than 1% to over 13%. States such as Florida, Texas, Nevada, Tennessee, South Dakota, Wyoming, Alaska, and New Hampshire do not tax wages. Cities like New York, Philadelphia, and some Ohio localities add a municipal income tax.
Payroll taxes (FICA)
Employees pay 6.2% for Social Security and 1.45% for Medicare, totaling 7.65%. Employers contribute an equivalent amount. Self-employed individuals pay both sides, totaling 15.3% on net profit. The Social Security wage base has an annual inflation-adjusted cap; Medicare has no cap.
Capital gains and dividends
Sales of stocks, funds, real estate, and other assets generate capital gains or losses. Assets held for more than one year are taxed as long-term capital gains, with preferential rates of 0%, 15%, or 20%, depending on the income bracket. Short-term gains are taxed at ordinary income rates. Qualified dividends follow the same favorable treatment as long-term capital gains.
Alternative Minimum Tax
The AMT is a parallel calculation that limits excessive tax reduction through deductions and exemptions. It applies mainly to high-income taxpayers with complex tax profiles. It is worth calculating both amounts and paying the higher one.
Other taxes
- Property tax, levied by counties and municipalities on real estate.
- Sales tax, with state and local rates combined ranging from 0% to over 10%.
- Federal estate and gift tax, with rates up to 40% above the lifetime exemption threshold.
Essential documentation
Document organization determines the speed and accuracy of your return. Collect income records, deductible expense receipts, and tax identification information for all dependents throughout the year.
Income records
- Form W-2, issued by each formal employer.
- Forms 1099 (NEC, MISC, K, INT, DIV, R, B), depending on the type of payment received.
- Form SSA-1099, for Social Security benefits.
- Forms 1098 and 1098-T, for mortgage interest and educational expenses.
- Brokerage statements showing capital gains and losses.
Identification documents
Have the Social Security Number (SSN) or ITIN of the filer, spouse, and all dependents on hand. For recent immigrants, the ITIN is requested via Form W-7, attached to the return itself.
Deduction records
- Receipts for donations to qualified organizations (501(c)(3)).
- Bills and statements for significant medical expenses.
- Student loan interest statements (Form 1098-E).
- Child care expenses for the Child and Dependent Care Credit.
- Mileage logs and expense records for self-employed workers.
Deadlines and extensions
The regular deadline to file the federal return for tax year 2025 was April 15, 2026. Those who needed more time could request an automatic six-month extension via Form 4868, pushing the final filing deadline to October 15, 2026. The extension provides additional time only to file the form, not to pay. Any tax owed remains due on April 15, subject to penalties and interest.
Estimated tax payments must be made in four quarterly installments by self-employed individuals, partnership members, S-corporation shareholders, and other taxpayers without sufficient withholding.
Refunds: how to receive yours faster
The IRS processes most refunds for electronically filed returns within 21 days. Three practices are key to speeding up receipt:
- File electronically rather than on paper.
- Opt for direct deposit into a US checking account.
- Double-check names, SSNs, and bank information before submitting, to avoid rejections.
Refund status can be tracked using the Where’s My Refund? tool on the IRS website, which updates daily after 24 hours from submission.
Deductions and credits that reduce your bill
The difference between a deduction and a credit is fundamental. A deduction reduces taxable income; a credit reduces the tax owed dollar for dollar. Credits have a greater financial impact.
Standard deduction and itemized deductions
For tax year 2025, the standard deduction is $15,000 for single filers, $30,000 for married filing jointly, and $22,500 for heads of household. Taxpayers should compare this amount with the sum of itemized deductions (mortgage interest, charitable contributions, state and local taxes capped at $10,000, and medical expenses exceeding 7.5% of adjusted gross income) and choose the more advantageous option.
Key credits
- Child Tax Credit, up to $2,000 per qualifying child under 17, with a refundable portion.
- American Opportunity Credit, for expenses during the first four years of higher education.
- Lifetime Learning Credit, for continuing education and graduate studies.
- Earned Income Tax Credit (EITC), for low- and moderate-income workers.
- Saver’s Credit, for contributions to retirement accounts such as 401(k) and IRA.
- Foreign Tax Credit, for immigrants who paid income tax in other countries on the same income base.
Common mistakes that cost money
Recent immigrants often make mistakes when choosing their tax residency status, by failing to disclose foreign bank accounts (FBAR and Form 8938), by being double-taxed on Brazilian income, or by incorrectly claiming the standard deduction — which nonresidents are not entitled to. Consulting an Enrolled Agent or CPA with international experience prevents late corrections and accumulated penalties. The IRS offers the VITA program, staffed by certified volunteers, for low-income taxpayers, seniors, and individuals with limited English proficiency.
Year-round tax planning
Tax season does not start in January: it starts with the first paycheck. Adjusting Form W-4 with your employer, contributing to a 401(k) and traditional IRA, keeping digital records of deductible expenses, and reviewing your tax position quarterly are habits that transform filing from a race against the clock into a simple confirmation exercise. For self-employed workers, setting aside 25% to 30% of each payment in a separate account covers federal, state, and self-employment taxes without any surprises.
Understanding the American tax system is part of the life plan for anyone who chooses to live and work in the US. Each correctly completed form protects your immigration record, strengthens your credit profile, and opens the door to benefits that depend on tax compliance, such as naturalization and family sponsorship.
Victoria Harper
Editor-in-Chief
Leading journalism and editorial content at Visto n’ Visa, Victoria helps make immigration topics clear, trustworthy, and easy to understand. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.
