Estimated Taxes and Instalments: Paying Two Countries Through the Year Without Overpaying Either

Short version: Canadian Tax Instalments Explained for Individuals

Both countries expect tax to be paid as income is earned, and both charge interest (and in the US, a penalty) when it is not. Employees are covered by withholding. Self-employed people, investors, landlords, and anyone with income from the other country that is not withheld at source must pay through the year: quarterly estimated payments in the US, quarterly instalments in Canada. A cross-border filer can be required to pay both, and the foreign tax credit that eliminates the double tax on the return does not eliminate the double payment during the year unless the payments are planned together.

Key takeaways

• Canada: instalments are required if net tax owing (after withholding) exceeds $3,000 ($1,800 for Quebec residents) in the current year and in either of the two previous years. The CRA sends instalment reminders based on prior years; payments are due March 15, June 15, September 15, and December 15. Interest applies to shortfalls; there is no separate penalty unless interest exceeds $1,000.
• US: estimated payments are required if you expect to owe $1,000 or more after withholding and credits. Payments are due April 15, June 15, September 15, and January 15. The safe harbor: pay 100% of the prior year's tax (110% if prior-year AGI exceeded $150,000) or 90% of the current year's tax, whichever is less, to avoid the underpayment penalty.
• Non-residents owe instalments or estimates on source-country income that is not fully withheld: a Canadian with US rental income under the section 871(d) election owes US estimates; a US person with Canadian rental income under section 216 owes Canadian instalments on the net rent (the NR6 withholding usually covers it).
• Withholding in one country counts only in that country. Canadian tax withheld from salary does not reduce the US estimated payment requirement, though the foreign tax credit it produces reduces the US tax that the estimate targets.
• Plan the estimates on the after-credit tax, not the gross tax, or you will overpay one country and wait a year for the refund.

The Canadian instalment system

The CRA calculates instalment reminders using the no-calculation option (based on the two prior years' net tax owing) and sends them in February and August. Taxpayers can instead pay based on the prior year's actual tax or the current year's estimated tax; interest applies only if the option chosen results in a shortfall. Instalments are required only when net tax owing exceeds the threshold in the current year and one of the two prior years, so a first year of unwithheld income does not trigger them, but the second does.

For a Canadian resident with US-source income (rental income, US self-employment income, US investment income), the Canadian tax on that income net of the foreign tax credit is what drives the instalment requirement. If the US tax is paid through US estimates, the Canadian credit reduces the Canadian net tax owing and can bring it under the threshold.

The US estimated tax system

Form 1040-ES payments are due quarterly. The underpayment penalty is computed on Form 2210 and is avoided by meeting the safe harbor. Taxpayers abroad with no US withholding on their income (a US citizen in Canada with only Canadian salary) often owe nothing after the foreign tax credit and can skip estimates, but those with US-source investment income, a residual US tax after the credit, or the net investment income tax (which the credit cannot offset) owe estimates on that residual.

Non-resident aliens with US-source income not subject to withholding (rental income under the 871(d) election, effectively connected business income) file Form 1040-ES (NR) on the same schedule.

Coordinating the two

The overlap is in the year's timing, not in the final tax. A Canadian resident with $40,000 of net US rental income owes US estimates on the US tax (roughly $5,000) and Canadian instalments on the Canadian tax net of the credit (roughly $16,000 at Ontario rates less $5,000). Paying US estimates of $5,000 and Canadian instalments of $21,000 overpays Canada by $5,000 until the T1 is filed. The instalment calculation should anticipate the credit.

The reverse: a US citizen in Canada with Canadian salary (withheld) and $30,000 of US dividends. Canadian withholding covers the Canadian tax on salary; Canadian instalments may be required for the Canadian tax on the dividends. US estimates are required only for the residual US tax after the foreign tax credit, which on qualified dividends is often small, plus the NIIT.

Departure and arrival years

In the year of a move, both countries' payment systems apply to their respective periods. A Canadian who leaves on June 30 owes Canadian instalments for the resident period (the CRA's reminders will be based on prior full years and overstate the requirement; pay based on the current year) and US estimates for the resident period from July. The departure tax itself is due with the final T1 by April 30 of the following year, or can be deferred with security.

Worked example

An Ontario resident owns a Florida rental producing $30,000 of net income after depreciation and has no other unwithheld income.

• US. Section 871(d) election; US tax roughly $3,500. Estimated payments of about $875 per quarter on Form 1040-ES (NR); no Florida tax.
• Canada. Net rental income $36,000 CAD before CCA; Canadian tax roughly $19,000 at her marginal rate; foreign tax credit roughly $4,800 CAD; net Canadian tax about $14,000. Instalments required (net tax owing exceeds $3,000 this year and last); pay about $3,500 per quarter based on the current-year estimate rather than the CRA's reminder, which does not anticipate the credit.
• Result. Both countries paid through the year; the T1 and 1040-NR reconcile with small balances; no interest in either country.

Official sources

"You may have to pay tax instalments for next year's taxes, if your net tax owing is more than $3,000 (for Quebec $1,800) for 2026 and in either 2025 or 2024. Tax instalment payments are due by the following dates (except farmers and fishers who have one due date on December 31): March 15, June 15, September 15, December 15." — Canada Revenue Agency, Paying your income tax by instalments, https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/making-payments-individuals/paying-your-income-tax-instalments.html

"Individuals, including sole proprietors, partners, and S corporation shareholders, generally have to make estimated tax payments if they expect to owe tax of $1,000 or more when their return is filed." — Internal Revenue Service, Estimated Taxes, https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes

Practitioner note

The instalment reminder the CRA sends does not know about the US tax credit, and the client who pays it in full overpays Canada by the amount of the credit every year. We compute both countries' payments on the after-credit tax and tell the client which option to use on the Canadian side so the shortfall interest does not apply.

See also: Planning a move? Start with the Canada-to-US tax checklist and browse every corridor by city, province, and state.

Next step

Fairlight prepares the annual estimated payment and instalment plan for both countries, coordinated with the foreign tax credit, and the returns that reconcile them. See cross-border pricing or book a call.