If you own a US LLC as a Canadian resident, the Form 1040-NR question lands every spring. Most online answers tell you the deadline (June 15) and that you need an ITIN. They skip the actual decision: do you need to file at all? Most Canadian-owned single-member LLCs with no US trade or business or only passive FDAP income do not need to file 1040-NR. The forms required and timing depend on the income classification and the structure. This is the decision tree.
30-second answer
You must file Form 1040-NR if you have effectively connected income (ECI) from a US trade or business, including most active US LLC operations. You may not need to file if your only US income is FDAP collected through withholding (royalties, dividends, portfolio interest) and the withholding satisfied your tax. The deadline is June 15 for non-residents who do not have wages subject to US withholding. Form 4868 extends to October 15. Without an ITIN, the return cannot be processed. Apply for ITIN simultaneously via Form W-7 attached to the return, or proactively before tax season.
Decision tree: do you need to file 1040-NR?
| Your situation | 1040-NR required? |
|---|---|
| Active US trade or business income (ECI), any amount | Yes |
| US-source FDAP income, withholding correctly applied at source | Often no, but file to claim treaty refund or report deductions |
| US-source FDAP, no withholding done | Yes |
| Single-member LLC owned by a Canadian, US business income | Yes |
| Single-member LLC owned by a Canadian, no US-source income | No personal 1040-NR, but Form 5472 + Pro Forma 1120 required |
| Multi-member LLC, US business operations | Yes (each foreign partner files) |
| Sale of US real estate (FIRPTA) | Yes |
| Wages subject to US withholding | Yes |
The key distinction: ECI almost always requires 1040-NR, FDAP collected at source usually does not. Form 5472 is separate from 1040-NR and is required for any US-owned LLC with reportable transactions, regardless of income.
Filing deadline timing
Three deadlines matter: estimated tax, original return, extended return.
| Item | Deadline | Note |
|---|---|---|
| Estimated tax (Form 1040-ES NR) | April 15, June 15, September 15, January 15 | Required if you owe over $1,000 in tax |
| Form 1040-NR original | June 15 | Automatic 2-month extension for non-residents |
| Form 1040-NR with extension | October 15 | File Form 4868 to extend |
| Form 5472 + Pro Forma 1120 | April 15 (or with extension to October 15) | Separate from 1040-NR. $25,000 penalty for late or missing |
The June 15 deadline applies to non-residents whose tax home and abode are outside the US. Canadian residents qualify by default. Note that the extension to October 15 covers filing only. Taxes owed must still be paid by June 15 to avoid interest.
Form 5472 deadline (April 15) is critical and often missed. Late or missing 5472 triggers a $25,000 penalty, regardless of whether the LLC owed any income tax. Many Canadian SMLLC owners file 1040-NR by June 15 but forget that 5472 was due April 15.
ITIN simultaneous filing
Without an Individual Taxpayer Identification Number (ITIN), the IRS cannot process your 1040-NR. The application is Form W-7.
Three ways to obtain ITIN:
| Method | Time | Cost |
|---|---|---|
| Mail Form W-7 with original Canadian passport | 8-12 weeks | $0 |
| IRS Acceptance Agent (AA) in Canada | 4-8 weeks | $200-500 |
| Certified Acceptance Agent (CAA) | 4-6 weeks | $300-700 |
Mail submission requires sending your original passport to the IRS, which is rarely practical. Most Canadian non-residents use a CAA or AA who can verify documents and submit on your behalf.
Form W-7 can be filed simultaneously with your 1040-NR. Mark the appropriate exception code and attach W-7 to the return. The IRS processes ITIN first, then the return. This is the typical first-year approach. For repeat filers, get the ITIN before tax season ends.
CRA timing mismatch (the trapped FTC problem)
Even when 1040-NR is filed correctly, the CRA classification creates timing trouble.
The CRA treats US LLCs as foreign corporations. Income earned by the LLC is taxed in Canada only when distributed to the Canadian member as a dividend. So ECI taxed in the US at year 1 may not be taxed in Canada until year 2 (when distributed).
| Year | US side (1040-NR) | Canada side |
|---|---|---|
| Year 1 | $50K ECI taxed at 22% federal = $11,000 paid to IRS | $0 (no distribution yet) |
| Year 2 | $0 (no new income) | $50K distributed → taxed in Canada |
| Year 2 FTC | T2209 limited to "Canadian tax payable on the same income" | Limited credit available |
The Foreign Tax Credit on T2209 can be limited by the timing mismatch. US tax paid in Year 1 may not be fully creditable in Year 2 because the same income is recognized in different periods. Cross-border CPAs typically recommend either matching distributions to profit recognition (avoid retention inside the LLC) or using Form 8832 to elect C corporation treatment, which aligns classification.
Filing exemption cases
Most online articles say "you must file 1040-NR." This is incomplete. Several scenarios genuinely exempt a Canadian non-resident from filing 1040-NR personally.
Scenario A: SMLLC with no US-source income
Canadian-owned SMLLC operates entirely outside the US (no US customers, no US contractors, no US employees, no US assets). The LLC is disregarded. Canadian member has no US-source income.
| Filing requirement | Need? |
|---|---|
| Form 1040-NR | No (no US-source income) |
| Form 5472 + Pro Forma 1120 | Yes (reporting transactions, even if no tax) |
| EIN | Yes |
This is a common Canadian "Wyoming LLC for asset isolation" structure. Tax filing is minimal but not zero.
Scenario B: FDAP only, withholding satisfied
Canadian receives US dividends through US broker, withholding tax (treaty rate 15%) deducted at source. No other US income.
| Filing requirement | Need? |
|---|---|
| Form 1040-NR | Optional. File only to claim refund or report deductions |
| W-8BEN | Yes, on file with broker |
Filing 1040-NR is optional in this case. Most Canadians do not file because the broker's withholding satisfies the obligation.
Scenario C: Treaty Article VII protection
Active US business income (technically ECI) but no US permanent establishment.
| Filing requirement | Need? |
|---|---|
| Form 1040-NR | Yes, file as protective return |
| Form 8833 | Yes, attach to claim treaty position |
| US tax owed | $0 (treaty exempts) |
Filing protectively locks in the treaty position and starts the IRS statute of limitations. Skipping creates open exposure if the IRS later asserts a US PE.
Worked examples
Case 1: Toronto SaaS founder, no US PE
Canadian SaaS founder, $200K LLC profit, no US employees or office, US customers.
| Item | Result |
|---|---|
| Income classification | ECI (active business, US customers) |
| US PE | None |
| Form 1040-NR | Yes (protective return) |
| Form 8833 | Yes (Article VII treaty position) |
| US tax | $0 |
| Form 5472 | Yes |
| ITIN | Required for first filing |
| Deadline | June 15 (1040-NR), April 15 (5472) |
Case 2: Vancouver contractor with US wages
Canadian contractor receives W-2 from US client (treated as US employee), $80K wages.
| Item | Result |
|---|---|
| Income classification | Wages, US-source |
| Form 1040-NR | Yes |
| US tax owed | Graduated rates 10-22% on net |
| Treaty Article XV | May limit US taxation if under 183-day rule |
| ITIN or SSN | SSN if obtained, otherwise ITIN |
| Deadline | April 15 (wages subject to withholding move deadline up) |
Case 3: Calgary investor, US dividends only
Canadian invests in US-listed stocks through Canadian broker, $5K US dividends. Broker withholds 15% under treaty.
| Item | Result |
|---|---|
| Income classification | FDAP (dividend) |
| US tax | 15% withheld at source |
| Form 1040-NR | Optional. Most Canadians do not file |
| W-8BEN | Yes |
| Canadian filing | Report on T1 with foreign tax credit for US withholding |
Case 4: Edmonton SaaS founder, mid-year US move
Canadian moves to US in July, opens US office. Was Canadian resident for first 6 months.
| Item | Result |
|---|---|
| Filing status | Dual-status alien |
| Form 1040-NR | First half (resident period in Canada) |
| Form 1040 | Second half (US tax resident) |
| Treaty considerations | Article IV residency split, Form 8833 for residency change |
| Complexity | High. Cross-border CPA strongly recommended |
Frequently asked questions
My LLC had no income this year. Do I still file 1040-NR?
Personal 1040-NR is not required if you have no US-source income. However, if you own a US LLC, Form 5472 + Pro Forma 1120 is still required for the LLC, even with $0 income, because of reportable transactions like capital contributions, distributions, or related-party transactions. Missing 5472 triggers $25,000 penalty regardless of income.
Can my Canadian CPA file my 1040-NR?
Many Canadian CPAs do not file US returns. Look for a cross-border firm with both Canadian CPA and US CPA or Enrolled Agent credentials. The split-filing approach (Canadian CPA does T1, US firm does 1040-NR) is most common.
I missed June 15. What's the penalty?
If you owed tax: 5% per month late filing penalty (max 25%) plus interest. If no tax owed: typically no penalty for late filing of a refund return, though you forfeit the refund if not filed within 3 years. Form 4868 is the safer path to avoid penalty if you cannot file by June 15.
Do I need a separate ITIN for each year?
No. ITIN is permanent until expiration. ITINs expire after 3 consecutive years of non-use. Renew via Form W-7 if expired.