Who We Help · Private Mortgage Lenders & MICs · Cross-Border Tax
Private mortgage lender cross-border tax: US investors and US-secured loans
A mortgage investment corporation that pays a US resident investor is not paying interest for withholding purposes. That is true even though that same payment is treated as interest for a resident shareholder’s own tax return. Legally it is still a dividend from the corporation’s shares, and Canada withholds tax on dividends paid to non-residents accordingly. The other direction matters too. A Canadian lender financing a mortgage secured by US property has to ask whether the US will want a piece of that interest. That question needs an answer before the interest ever crosses the border back to Canada.
By the AnalytIQ Accounting team · Last reviewed: September 12, 2026
At a glance · private mortgage lenders and MICs
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A MIC payment to a US investor is withheld as a dividend
A MIC's payouts are treated as interest income, not dividend income, in a resident investor's hands. That is the tax mechanic that makes a MIC attractive. It does not change what the payment legally is at the corporate level: a dividend on shares. When that dividend is paid to a non-resident, including a US-resident investor, Canada applies Part XIII withholding tax on dividends, at a default statutory rate of 25%. That rate is generally reduced under the Canada-US tax treaty for a portfolio holding, once the investor files the paperwork confirming their treaty residency. The exact treaty rate and the documentation required can shift with treaty updates, so we confirm the current rate before assuming the reduced figure automatically applies.
This distinction is easy to miss precisely because the domestic marketing of a MIC leans so heavily on the interest-like character of its payouts. A fund manager who assumes a US investor's distribution is simply "interest, no different than what a Canadian shareholder gets" can under-withhold without realizing it. The withholding obligation sits with the fund, not the investor. A shortfall discovered later becomes the fund's problem to fix.
NR4 slips and NR301 declarations replace the domestic paperwork
A US-resident shareholder of a MIC receives an NR4 slip rather than the T5 a Canadian shareholder gets. The reduced treaty withholding rate is only available once the investor has filed an NR301 declaration confirming their US residency and treaty eligibility with the fund. Without that form on file, the fund is expected to withhold at the full 25% statutory rate regardless of where the investor actually lives. That is a paperwork gap that costs the investor real money. It is entirely preventable with an intake process that collects the form before the first distribution goes out. We build that collection step into onboarding for any fund with, or actively seeking, US investors. That beats chasing the form down after withholding has already been remitted at the higher rate.
Lending against US property raises the mirror-image question
A Canadian private lender or MIC might finance a mortgage secured by property in the United States. If so, the interest the US borrower pays back may be subject to US withholding tax on payments to a foreign lender. That withholding can be avoided if the loan qualifies for the US portfolio interest exemption. That is a US domestic-law relief that can eliminate withholding on certain interest paid to foreign lenders. The exemption is subject to conditions, including the lender's relationship to the borrower and the type of debt involved. Where the exemption does not clearly apply, treaty relief may reduce the rate instead, but neither outcome is automatic. This is a review to run on the specific loan structure before funding it. It is not an assumption to make because the loan is styled the same as a domestic Canadian mortgage.
The exemption generally depends on the lender not holding a significant ownership stake in the borrower, and the debt not being tied to certain equity-linked terms. Those conditions matter more than they first appear, once a private lender starts structuring creative terms into a US-secured deal. Confirming the exemption applies, or planning around the withholding if it does not, changes the actual yield on the loan. That belongs in the underwriting decision, not an afterthought once funds have already moved.
Which direction the money moves changes the exposure
| Payment direction | Exposure to review |
|---|---|
| Canadian MIC pays a US-resident investor | Canadian Part XIII withholding on dividends; NR4 and NR301 paperwork |
| US borrower pays interest on a US-property mortgage back to a Canadian lender | US withholding on outbound interest, unless the portfolio interest exemption or treaty relief applies |
Where this fits with the rest of the file
Every fund taking on US investors or US-secured loans should treat this review as ongoing, not a one-time check at launch. New investors and new loan structures both reset the analysis. A change in either the treaty or domestic legislation, on either side of the border, can also shift the numbers. That can happen without anyone at the fund noticing, until a return is filed. The domestic tax mechanics this sits alongside are on our lender tax services page. Our full Canada-US practice is described on our cross-border tax services page.
Source: CRA — Non-resident withholding tax.
What we take off your plate
Cross-border tax for private mortgage lenders and MICs, handled.
- NR4 and NR301 paperwork filed on every MIC payment to a US investor
- US withholding checked before lending against US-secured property
- Canadian and US returns prepared by one team
- Treaty positions and foreign tax credits lined up
- FBAR and T1135 foreign reporting
- ITIN applications certified in-house
Mistakes we fix
Three things that go wrong for private mortgage lenders and MICs.
- Taxing a lending corporation’s interest as active business income when it lacks the MIC election
- Treating a MIC’s payment to a US investor as interest instead of withholding it as a dividend
- Booking a borrower default as a loss before the mortgage is actually written off as uncollectible
Recognise one? Book a call and we will tell you what it is costing you.
Services for private mortgage lenders and MICs
Six services, one team that knows how private mortgage lenders and MICs run.
Start with one. Add the rest when it makes sense; the books, payroll and tax already talk to each other.
Free proposal
A fixed fee for your cross-border tax work, in writing.
- Tell us about your business. The form takes about a minute.
- A short discovery call. Fifteen minutes to confirm what you need.
- A fixed fee in writing. We reply within one business day. No hourly surprises.
- Canadian and US filings under one roof
- Cloud-first: QuickBooks Online, Dext, Wagepoint
- Brampton, Ontario, with clients across Canada and the US
Related answers
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Common questions.
Does a MIC withhold tax on payments to a US investor?
Yes. Even though the payment is treated as interest income for a resident shareholder, it is legally a dividend. So Canada applies Part XIII non-resident withholding on dividends, generally reduced under the Canada-US treaty once the investor files an NR301 declaration.
What slip does a US investor in a Canadian MIC receive?
An NR4 slip rather than the T5 a Canadian resident shareholder gets, reporting the gross payment and the Canadian tax withheld.
Does the US tax interest on a mortgage secured by US property paid to a Canadian lender?
It can, unless the payment qualifies for the US portfolio interest exemption or a reduced treaty rate applies. This depends on the specific loan structure and should be reviewed before funding, not assumed to work like a domestic Canadian mortgage.
Related reading
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