TFSA and US Taxes, Explained

~7 min read·Updated September 2026

Tool:PFIC Risk Checker: see whether what's inside your TFSA makes this worse.

A Tax-Free Savings Account is tax-free under exactly one tax system: Canada's. The moment you become a US person, the account keeps its Canadian name and contribution room, but every one of the US tax advantages you'd expect from something called "tax-free" simply isn't there. This trips up more people than the RRSP question does, precisely because the RRSP problem is well known and the TFSA problem usually isn't.

The RRSP shelter doesn't extend to the TFSA

The Canada-US tax treaty specifically recognizes RRSPs and RRIFs as tax-deferred retirement arrangements, which is why the IRS lets their growth compound without annual US tax (see RRSP Withholding Tax for US Residents). The TFSA has no equivalent article. It didn't exist when the treaty was last substantively amended on this point, and nothing since has added it. From the IRS's point of view, a TFSA is just a regular taxable brokerage or savings account that happens to sit at a Canadian institution and happens to be tax-free back in Canada.

⚠️"Tax-free" is doing no work on your US return

Interest, dividends, and realized capital gains inside a TFSA are generally taxable on your US return every year they occur, exactly as if the account weren't registered at all. The label "tax-free savings account" describes its Canadian treatment only; it has no bearing on what you owe the IRS.

What's actually inside it usually matters more than the account itself

The annual-taxation problem above is the baseline case, and it's a real cost but a manageable one: it's the same treatment a normal brokerage account gets. The much bigger issue shows up if the TFSA holds Canadian-domiciled mutual funds or ETFs, because those are commonly PFICs (Passive Foreign Investment Companies) from the IRS's perspective, and a TFSA wrapper does nothing to shield a PFIC held inside it. Each PFIC fund can require its own Form 8621, and the default "excess distribution" tax regime is punitive: back-dated interest charges and top-bracket rates applied retroactively, regardless of your actual bracket. See PFICs and Canadian ETFs, Explained for exactly how that calculation works. A TFSA holding only cash, a GIC, or individual US-listed stocks avoids the PFIC problem entirely; a TFSA holding a Canadian robo-advisor's diversified ETF portfolio is often the single worst structure a new US person can have.

ℹ️Usually not its own foreign trust, unlike an RESP

A TFSA is typically treated in practice as an ordinary custodial account rather than a separate foreign trust arrangement, so it doesn't usually raise the Form 3520/3520-A question the same way an RESP does (see below). This distinction depends on how your specific TFSA is structured; confirm it with a cross-border specialist rather than assuming it applies to your account.

The reporting obligations are unaffected by any of this

Whether or not the TFSA holds a PFIC, its balance still counts toward both the FBAR aggregate-$10,000 test and the FATCA Form 8938 thresholds, the same as an RRSP or an ordinary Canadian bank account. See FBAR and FATCA for Canadians in the US, Explained for the exact thresholds and the penalties for missing either filing. None of the annual-taxation or PFIC exposure above changes those reporting rules, and none of those reporting rules reduce the annual-taxation or PFIC exposure either: these are three separate questions that happen to share one account.

What people commonly do about it

There's no single right answer here, and it depends on whether you're already a US person with an existing TFSA or still deciding whether to open one. Options people actually weigh: keep contributing but hold only cash or US-listed securities inside it to avoid the PFIC layer while accepting the annual US tax on any growth; stop contributing (Canadian contribution room keeps accruing while you're a non-resident of Canada for TFSA purposes, so nothing is permanently lost by pausing); or wind the account down before you become a US person, similar to the PFIC-avoidance timing move described in the PFIC guide. Which makes sense depends on your specific balance, holdings, and how long you expect to be a US person.

📋Don't open a new TFSA after becoming a US person without checking this first

The contribution room is real and the account is easy to open, which is exactly why people do it without realizing what they've created. Run whatever you're planning to hold in it through the PFIC Risk Checker before funding it, and budget for annual US tax on any growth regardless of what you decide to hold.

Not tax, legal, or immigration advice: TFSA treatment depends on your specific holdings, balances, and residency history; confirm your own situation with a cross-border tax specialist. See the methodology page for the underlying PFIC and reporting-threshold citations, and the Moving Back to Canada guide for what changes if you're heading the other direction.