Can I File a Joint US Return with My Non-Resident Canadian Spouse?

If you are a US citizen or resident alien married to a Canadian who is not a US person, you can elect to file a joint US return by treating your spouse as a US resident under IRC 6013(g). The election gives you the married filing jointly (MFJ) brackets, which are wider than the married filing separately (MFS) brackets, and the higher MFJ standard deduction. The trade-off is that your Canadian spouse’s worldwide income becomes reportable (and potentially taxable) on the US return.

Whether the election saves or costs money depends on the numbers: your income, your spouse’s income, and how much of your spouse’s Canadian tax generates usable FTCs on the joint return.

How does the election work?

You attach a statement to your joint return (Form 1040) for the first year of the election. The statement identifies both spouses, states that you are electing to treat the non-resident spouse as a US resident under IRC 6013(g), and is signed by both spouses. There is no separate form.

Once made, the election applies for that year and all subsequent years until it is revoked or terminated. It is not a year-by-year choice (unlike some other elections). You are locked in until one of the termination events occurs.

Termination events (IRC 6013(g)(4)):

• Either spouse revokes the election (by attaching a revocation statement to that year’s return)
• The couple divorces or legally separates
• The US-citizen spouse dies

A revocation is permanent. If you revoke the election, you can never make it again for the same spouse (IRC 6013(g)(4)(B)). This means the decision to revoke should be made carefully. If your spouse’s income situation changes and the election becomes unfavorable, you can revoke, but you lose the option permanently.

When does the election save money?

The election saves money when the tax benefit of MFJ brackets and credits exceeds the incremental US tax on the Canadian spouse’s worldwide income. The clearest win is a one-earner couple where the Canadian spouse has no income, because MFJ brackets and the higher standard deduction ($32,200 vs $16,100 for MFS) save $5,000 to $10,000+ with nothing on the other side. Two-earner couples often still benefit because the FTC for Canadian tax usually offsets the US tax on the spouse’s income.

• One-earner couple: The US person earns $120,000, the Canadian spouse has no income. The wider MFJ brackets and higher standard deduction reduce US tax by $5,000 to $10,000+ because there is no Canadian income to add.
• Two-earner couple, high Canadian income: The US person earns $100,000, the Canadian spouse earns $90,000 CAD. The spouse’s Canadian tax generates an FTC that usually offsets the US tax on the Canadian income, and the wider brackets on the US person’s income still produce a net savings, though smaller than the one-earner scenario.
• Two-earner couple, very high income: The US person earns $80,000, the Canadian spouse earns $250,000 CAD. The FTC limitation under IRC 904(a) may prevent full credit use in the current year (excess credits carry forward). The election may still save money, but the analysis requires a full calculation of both filing statuses.

When does the election cost money?

The election costs money in a narrow set of circumstances where the additional US tax exposure or compliance burden exceeds the MFJ bracket benefit. The risk increases as the Canadian spouse’s income grows, particularly when FTC limitation issues prevent full use of the Canadian tax credits or when the combined MAGI triggers additional taxes.

• High Canadian income with FTC limitation issues. If the Canadian spouse’s income is high enough to push the combined income into the highest US brackets, and the FTC limitation prevents full use of the Canadian tax credits, the election adds US tax that exceeds the MFJ bracket benefit.
• NIIT exposure. The 3.8% NIIT applies to the combined MAGI on a joint return. If the Canadian spouse has investment income, adding it to the joint return may push the combined MAGI over the $250,000 MFJ threshold, triggering NIIT that would not apply on an MFS return (MFS threshold is $125,000, but the US person’s income alone may already exceed that, so the comparison is not always straightforward).
• Loss of MFS-specific benefits. Some planning strategies work better with MFS (e.g., income-driven student loan repayment plans that use only one spouse’s income). The election eliminates MFS as an option for the duration of the election.

FBAR, Form 8938, and foreign account reporting

The election treats the Canadian spouse as a US resident for income tax purposes. This means the Canadian spouse’s financial accounts become reportable:

• FBAR (FinCEN 114): the Canadian spouse must file an FBAR reporting all non-US financial accounts with an aggregate balance exceeding $10,000 at any point during the year. For a Canadian resident, this includes every Canadian bank account, investment account, RRSP, TFSA, and RESP.
• Form 8938: the Canadian spouse must file Form 8938 (FATCA) if the foreign financial assets exceed the applicable threshold (higher thresholds apply for joint filers living abroad, but if the US person lives in the US and the Canadian spouse lives in Canada, the threshold analysis is based on the US person’s residence, not the Canadian spouse’s).
• PFIC reporting: if the Canadian spouse holds Canadian mutual funds or Canadian-listed ETFs, those are PFICs, and Form 8621 is required for each one. This is one of the most significant compliance costs of the election: the Canadian spouse’s Canadian investment portfolio suddenly has US PFIC reporting obligations.

The reporting burden is the hidden cost of the election. The tax savings may be $5,000 to $10,000, but the compliance cost (preparing the additional forms, gathering Canadian account information, PFIC calculations) adds to the annual filing cost. For a simple Canadian financial picture (one bank account, one RRSP), the burden is manageable. For a complex one (multiple accounts, investment portfolio, TFSA, RESP), the burden is significant.

Can I make the election retroactively?

No. The election is made on a timely filed return (including extensions) for the first year it applies. You cannot amend a prior year’s MFS return to add the election retroactively. If you missed the election in a prior year, you can make it on the current year’s return going forward, but you cannot go back.

What if my spouse becomes a US resident later?

If the Canadian spouse becomes a US resident (through immigration, green card, or substantial presence), the election becomes moot: they are a US resident by their own status, and MFJ is available without the election. The election can be left in place (it has no effect when both spouses are US residents) or revoked (but remember, revocation is permanent).

If the spouse later leaves the US and becomes a non-resident alien again, the election (if not revoked) continues to apply. If it was revoked when the spouse was a US resident, it cannot be reinstated.

What should I do next?

If you are filing MFS because your spouse is a non-resident alien, calculate what MFJ would look like using the 6013(g) election. Include the FTC for your spouse’s Canadian tax, the FBAR and Form 8938 obligations, and any PFIC exposure from your spouse’s Canadian investments. If the net savings are meaningful after compliance costs, make the election. If the compliance costs are close to the tax savings, MFS may be the better choice despite the higher tax rate.

• How to apply for an ITIN as a Canadian, because your non-resident spouse needs an ITIN before you can file the joint return
• The 3.8% NIIT for US citizens in Canada, because the election affects MAGI and NIIT exposure
• What can I invest in without PFIC problems?, because the spouse’s Canadian investments create PFIC exposure on the joint return
• Form 8938 vs FBAR: do I file both?, because the election triggers both for the Canadian spouse
• Is a TFSA a foreign trust?, relevant if the Canadian spouse has a TFSA
• Streamlined filing for married couples, when both spouses need to catch up on unfiled returns through the streamlined program
• Income splitting: Canada vs US, pension splitting, spousal RRSP, and how joint filing fits the broader picture
• Alimony and spousal support cross-border, the tax treatment if the marriage ends and support crosses the border
• Getting married cross-border, the full picture of what changes on both returns when a Canadian marries a US person

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.