Form 8840 guides

Plain answers for Canadian snowbirds about IRS Form 8840, in the order you’ll need them.

Free toolUS day calculator for snowbirdsEnter three yearly totals and see your IRS day count and whether you need to file.Open the calculator

1Do I need to file?

Do I need Form 8840?The 183-day formula, with examples, and when Form 8840 is the right form.How to count your US daysPart days, trips over New Year’s, layovers, cruises.How to find your US travel datesThe free US I-94 history, your CBSA report, and your own records.Form 8840 vs 1040-NR: which do I need?When Form 8840 is enough, and when you also need a US return.

2Filling it out

Form 8840, line by lineEvery line explained, and how a typical snowbird answers it.Form 8840 for couplesEach person files their own form. What can match, and how to mail two.Form 8840 for 2026When the 2026 form comes out, and the June 15, 2027 deadline.

3Sending it

Where to mail Form 8840 from CanadaThe IRS address in Austin, postage from Canada, and a checklist.Can I file Form 8840 online?Why it has to be mailed, and the quickest way to get it done.

4Every year and special cases

Do I file every year?One form per year, and years you can skip.I missed June 15What a late form means, and when to get help.I own a US homeYes, if Canada is your main home. Line 15, renting and selling.Provincial health limitsHow long you can be away and keep your provincial plan.

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Onward is an independent Canadian service, not the IRS. This page explains the rules in plain terms; it isn't tax or legal advice. If your situation is unusual, speak with a cross-border tax professional.