Self-Employment Tax for US Citizens in Canada: CPP vs FICA

A US citizen who is self-employed in Canada faces a payroll-tax question that employed workers do not: which country’s social insurance system do you pay into, and can you end up paying both? For employees, the employer handles the remittance and the totalization agreement sorts out which country collects. For the self-employed, you handle both sides yourself, and if you do not know how the US-Canada totalization agreement applies, you can pay CPP contributions in Canada and US self-employment tax (FICA) on the same income, a double hit that the totalization agreement is supposed to prevent.

What is US self-employment tax?

US self-employment tax is the self-employed person’s version of FICA (Federal Insurance Contributions Act). When you work for an employer, the employer pays half of Social Security (6.2%) and Medicare (1.45%), and your paycheck has the other half withheld. When you are self-employed, you pay both halves through Schedule SE on your Form 1040.

• Social Security. 12.4% on net self-employment income up to the Social Security wage base ($176,100 for 2025). The self-employed person pays the full 12.4%.
• Medicare. 2.9% on all net self-employment income, with no cap. Plus the Additional Medicare Tax of 0.9% on self-employment income above $200,000 ($250,000 MFJ).
• Total SE tax rate. 15.3% on net self-employment income up to the wage base (12.4% + 2.9%), then 2.9% above the wage base (plus 0.9% above $200,000/$250,000).
• Deduction. Half of the SE tax is deductible as an adjustment to income on the 1040. This is a US deduction that reduces income tax but does not reduce the SE tax itself.

The SE tax is in addition to income tax. A US citizen earning $100,000 in net self-employment income owes approximately $14,130 in SE tax plus income tax on the same income.

What are CPP contributions for the self-employed?

In Canada, the self-employed pay both the employee and employer portions of CPP (Canada Pension Plan) contributions through Schedule 8 of their T1 return.

• CPP rate (2025). 5.95% employee + 5.95% employer = 11.9% total on pensionable earnings between $3,500 (basic exemption) and $71,300 (first ceiling). Plus CPP2 at 4% each (8% total) on earnings between $71,300 and the second ceiling ($81,200 for 2025).
• Maximum contribution (2025). Approximately $8,068 for the base CPP (both portions) plus the CPP2 amount on earnings in the CPP2 range.
• No Medicare equivalent. Canada does not have a separate Medicare payroll tax. Healthcare is funded through general tax revenue, not a dedicated payroll levy.

The CPP contribution is mandatory for self-employed Canadians and Canadian residents with self-employment income. Half of the CPP contribution (the “employer” portion) is deductible on the T1 return.

How does the totalization agreement work?

The US-Canada Agreement on Social Security (the totalization agreement) prevents double coverage and double contributions. The basic rule: you pay into the social insurance system of the country where you work.

• Self-employed in Canada. If you are self-employed and physically working in Canada, you are covered under the Canadian system (CPP). You are exempt from US SE tax on that income.
• Self-employed in the US. If you are self-employed and physically working in the US, you are covered under the US system (Social Security/Medicare). You are exempt from CPP on that income.
• Temporary assignment exception. If you are temporarily self-employed in the other country for a period expected to last five years or less, you may remain covered under your home country’s system. This exception is more commonly used by employees on temporary assignment than by the self-employed.

For a US citizen who lives and works in Canada full-time, the standard rule applies: CPP in Canada, no US SE tax. The totalization agreement is automatic in principle, but on the US return you must claim the exemption or the IRS will assess SE tax.

How do I claim the SE tax exemption on the US return?

The IRS does not automatically know that you are covered under the Canadian system. To claim the exemption:

Option 1: Certificate of coverage. Request a certificate from the CRA (or Service Canada) confirming that you are covered under the Canadian system. Attach the certificate to your 1040. The certificate is Form CAN/USA 1 or its equivalent.

Option 2: Self-certification on the return. Many cross-border filers attach a statement to the 1040 explaining that they are self-employed in Canada, covered under the CPP, and exempt from US SE tax under the US-Canada totalization agreement. This is the practical approach when the certificate has not been obtained. The IRS has generally accepted this, though the certificate is the formal documentation.

On the 1040:

• Do not file Schedule SE (or file it with zero, depending on your preparer’s approach)
• Attach a statement explaining the totalization agreement exemption
• Report the self-employment income on Schedule C (the income is still subject to US income tax; only the SE tax is exempt)

What if I am self-employed in both countries?

If you perform self-employment services in both countries (for example, you live in Canada but travel to the US for client work), the totalization agreement allocates coverage based on where the services are performed:

• Income from services performed in Canada: covered under CPP, exempt from US SE tax
• Income from services performed in the US: covered under US SE tax, potentially exempt from CPP

The allocation can be complex when the work location varies throughout the year. For a US citizen who does most work from a Canadian home office but occasionally visits US clients, the majority of the income is Canadian-source and covered under CPP. The US-source portion (attributable to days physically working in the US) may be subject to US SE tax.

In practice, many cross-border self-employed individuals allocate based on the proportion of days worked in each country. The totalization agreement provides for a certificate of coverage that clarifies the allocation, but the IRS and CRA have limited published guidance on the mechanics of splitting self-employment income between the two systems.

How does the FTC interact with CPP?

CPP contributions are not foreign income taxes. They are social insurance contributions. This distinction matters because:

• CPP is not creditable as an FTC. You cannot claim CPP contributions on Form 1116 as a foreign tax credit. The FTC applies to foreign income taxes only, not to social insurance contributions.
• CPP is deductible. The employer portion of CPP contributions (half of the total) is deductible on the Canadian T1 return, which reduces your Canadian income tax. The lower Canadian income tax reduces the FTC available on the US return, but this is a mechanical effect, not a double-counting problem.
• US SE tax is not creditable as a Canadian deduction. If you do owe US SE tax (because some income is US-source), the SE tax is not deductible on the Canadian return.

The two systems (income tax coordinated through the FTC, social insurance coordinated through the totalization agreement) operate on parallel tracks. The FTC handles income tax, and the totalization agreement handles payroll tax. They do not overlap.

What about EI premiums?

Employment Insurance (EI) is not available to the self-employed in Canada by default. Self-employed individuals can opt into EI special benefits (maternity, parental, sickness, compassionate care) but cannot collect regular EI benefits (unemployment). If you opt in, you pay the EI premium (1.66% of insurable earnings for 2025, up to $65,400), but only the employee portion (there is no employer portion for the self-employed opting in).

EI does not have a US equivalent for the self-employed (FUTA applies to employers, not the self-employed), and the totalization agreement does not cover EI because EI is not part of the Social Security system covered by the agreement.

Common mistakes

• Paying both CPP and US SE tax. The most expensive mistake. If you do not claim the totalization exemption, the IRS assesses SE tax on your self-employment income even though you already paid CPP. The combined rate (15.3% US + 11.9% Canada) on the same income is punitive and unnecessary.
• Claiming CPP as an FTC. CPP is not a creditable foreign tax. Some preparers mistakenly include CPP in the Form 1116 calculation, which inflates the FTC and can trigger an IRS adjustment.
• Filing Schedule SE with income. If you are exempt under the totalization agreement, filing Schedule SE with net self-employment income creates a tax liability that should not exist. Attach the exemption statement instead.
• Ignoring CPP2. Starting in 2024, the second CPP contribution (CPP2) applies on earnings between the first and second ceilings. Some self-employed filers miss this additional contribution on their Canadian return.

What should I do next?

If you are a US citizen self-employed in Canada, the key steps are: (1) pay CPP contributions on your Canadian T1 return, (2) claim the totalization agreement exemption on your US 1040, and (3) use the FTC (not the FEIE) on your US return to offset income tax. The self-employment tax exemption and the income tax FTC operate independently, and both need to be in place.

• US-Canada totalization agreement, the agreement that prevents double coverage
• Self-employed cross-border: Canada and US, the income tax side of cross-border self-employment
• Form 1116 and the foreign tax credit, the FTC mechanics
• FEIE for US expats in Canada, why the FTC is usually better
• FEIE vs FTC for Canada, the detailed comparison

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