Filing Taxes in Miami: ITIN, SSN & CPA Guide

If you just arrived in Miami or haven't been in the United States long, taxes can feel overwhelming. The good news is that Florida does not charge a state income tax on personal earnings: residents don't file a state income tax return on their salary, which simplifies things considerably compared with other states. What does exist is the federal return filed with the IRS (Internal Revenue Service), and understanding it on time saves you from penalties, interest, and headaches. In this guide I walk you through, in clear steps, what newcomers living in Miami should know about filing taxes, without unnecessary jargon.

Do You Need to File? The Tax Residency Test

Not everyone living in the United States is a "resident" in the eyes of the IRS. Your filing obligation depends on your immigration status and your physical presence in the country. The IRS uses two main tests to decide whether you're a tax resident:

The green card test

If you're a lawful permanent resident (you hold a green card, Form I-551 issued by USCIS), you're a tax resident even if you spend little time in the country. This status continues until you officially give it up in writing, or until USCIS or a court terminates it administratively or judicially.

The substantial presence test

If you don't have a green card, you can still be considered a tax resident if you're physically present in the U.S. for at least:

• 31 days in the current year.
• 183 days over a three-year period that includes the current year and the two prior years, counting every day of the current year, 1/3 of the days in the first prior year, and 1/6 of the days in the second prior year.

There are exceptions: days when you're an "exempt individual" (for example, students or teachers on F, J, M, or Q visas who meet the visa requirements) don't count toward this test. If you exclude days as an exempt individual or due to a medical condition, you must file Form 8843 with your return, or even without a return, before the deadline. There's also a "closer connection" exception that in certain cases lets you avoid being treated as a resident even if you meet the test, as long as you have closer ties to another country. Practical bottom line: most immigrants with a green card or a long residence in Miami are tax residents and report their worldwide income on Form 1040.

Your Taxpayer ID Number: SSN or ITIN

To file, you need a taxpayer identification number (TIN). Two of them matter to you:

Social Security Number (SSN)

It's issued by the Social Security Administration (SSA), not the IRS. You apply with Form SS-5, providing evidence of identity, age, and your immigration status. It's free and processed at a local SSA office or by phone. If you're eligible for an SSN (for example, with certain immigration statuses or a green card), that's the number you'll use.

ITIN (Individual Taxpayer Identification Number)

If you can't get an SSN, the IRS issues you an ITIN. It's a 9-digit number that always begins with "9", in the same format as an SSN (NNN-NN-NNNN). You apply with Form W-7 (also available in Spanish as W-7(SP)), and it requires documentation proving your foreign status and identity. Key points about the ITIN:

• You generally must attach a federal tax return to Form W-7 (unless a documented exception applies).
• You can file by mail, in person at IRS service offices, or through an Acceptance Agent (IRS-authorized agents such as accountants, banks, or educational institutions) who review your documents and handle the application for you.
• You can't claim the Earned Income Tax Credit (EITC) using an ITIN. This matters to many families, so if you think you might qualify for that credit, talk to an accountant about whether your situation lets you get an SSN.

Filing as a Nonresident: Form 1040-NR

If you're a nonresident alien, the correct return is generally Form 1040-NR (U.S. Nonresident Alien Income Tax Return). In general terms you must file it if:

• You're engaged in, or considered to be engaged in, a trade or business in the U.S.
• You have U.S. income on which tax wasn't withheld at the source, and you want to claim a refund or certain credits and deductions.

Students, teachers, researchers, and exchange visitors on F, J, M, or Q visas are generally considered to be engaged in a U.S. activity and must file Form 1040-NR if they have taxable income (wages, tips, taxable scholarships, dividends, and so on). Golden rule: if your income is subject to U.S. federal tax, don't assume "it doesn't apply to me." Confirming whether you're a resident or nonresident determines which form you use and what income you report, and a mistake here is the most common cause of IRS problems.

Key Dates and What Happens If You Miss Them

For tax year 2025, the filing deadline was April 15, 2026. If you miss that date, you can file Form 4868 to request an automatic extension of time to file, usually until October 15, but note: the extension only gives you more time to file, not to pay. If you owe taxes, the sooner you pay (or set up a payment plan with the IRS), the less interest and penalties you'll accrue.

Do You Need an Accountant or CPA in Miami?

Not everyone needs a professional, but it's worth considering one in these cases:

• You were self-employed (freelancer, rideshare driver, own business, rentals): calculating deductions and estimated payments gets complicated.
• You're not a tax resident or your status changes mid-year: dual-status or nonresident returns are easy to get wrong.
• You have an ITIN and rely on credits and deductions: handling the W-7 and the forms must be precise, and it directly affects how much of a refund you get or how much you owe.
• You had a major life change during the year: marriage, children, buying a home, moving from another country.

When choosing an accountant or CPA in Miami, prefer professionals with a PTIN (the number every paid tax preparer must have), ask for references, and be wary of anyone who promises impossible refunds or asks you to sign a blank return. For immigration matters, an accountant doesn't replace a lawyer: they're different things. If your immigration status drives the forms you file, our guide on choosing an immigration lawyer in Miami will help.

Common Mistakes When Filing in Florida

1. Confusing SSN with ITIN and using or applying for the wrong number.
2. Not filing Form 8843 when excluding days as an exempt individual.
3. Choosing the wrong form (1040 vs 1040-NR) based on your actual residency status.
4. Assuming that because it's "Florida" you don't owe anything: Florida has no state income tax, but federal tax still applies.
5. Signing a return without understanding it: once signed, you're responsible to the IRS for what it contains.

Start early, gather your documents (W-2, 1099, W-7, receipts), and if the situation calls for it, consult a professional. Filing correctly and on time is the simplest way to keep your U.S. record clean and avoid overpaying in interest and penalties.