Yes. There is no Canadian law that prohibits holding a full-time employment position while also earning self-employment income. Millions of Canadians do this — as side businesses, consulting practices, freelance projects, or part-time ventures. What matters is understanding how the tax implications change when you have both income streams.
Is It Legal?
From a Canadian government perspective — federal and provincial — yes, absolutely. You can report employment income (T4) and self-employment income (T2125) on the same T1 tax return. There is no restriction on earning both simultaneously.
Important caveat: Check your employment contract. Some employers — particularly those in finance, consulting, or roles with access to confidential information — include non-compete or conflict-of-interest clauses that restrict outside business activities. Review your employment agreement before starting any self-employment that overlaps with your employer’s business. Violating your employment contract is an employment law issue, not a tax law issue, but it can have serious consequences.
How Income Tax Works With Both Streams
Both income streams are combined on your T1 personal tax return:
- Employment income is reported from your T4 slip on Line 10100
- Self-employment income is reported on Schedule T2125 — you calculate gross revenue, subtract allowable business expenses, and the net income appears on your T1
- Both amounts are added together for total taxable income, which is taxed at your marginal rate
Your employer withholds income tax at source based on your employment income alone. If your combined income (employment + net self-employment) pushes you into a higher bracket, you may owe additional tax at filing. Many people with both income streams make CRA tax instalment payments quarterly to avoid a large April 30 balance owing.
CPP: You Pay on Both
CPP contributions apply to both your employment income and your net self-employment income, up to the annual maximum.
- Your employer deducts and matches CPP on your employment income (5.95% each side)
- You pay both the employee AND employer portions on your net self-employment income (11.9% combined)
- However, the combined CPP contributions from both sources cannot exceed the annual maximum ($8,460.90 for 2026, based on the YMPE of $74,600)
If your employment income alone reaches the YMPE ($74,600), your employer will stop deducting CPP partway through the year. Any net self-employment income on top of that is not subject to additional CPP once the maximum is reached.
The employer-equivalent portion of your self-employment CPP (half of the 11.9%) is deductible from your taxable income — your accountant handles this automatically on your T1.
EI: Self-Employment Does Not Count
Employment Insurance (EI) premiums are deducted from employment income by your employer. Self-employment income does not attract EI premiums and does not generate EI entitlement — you cannot claim regular EI benefits based on self-employment income alone.
There is a voluntary EI program for self-employed Canadians (for parental and other special benefits), but it does not provide regular unemployment coverage.
GST/HST: Your Self-Employment Revenue Counts
Your employment income does not count toward the GST/HST registration threshold. Only your self-employment revenues count. If your freelance income exceeds $30,000 in four consecutive calendar quarters, you must register for GST/HST on your self-employment income regardless of your employment income level.
Tax Instalments
The CRA may require you to make quarterly tax instalments if your net tax owing (after source deductions and credits) exceeds $3,000 in the current year and either of the two prior years. This is common when you have significant self-employment income on top of employment income, since employment source deductions do not account for self-employment taxes.
Instalment payment dates: March 15, June 15, September 15, and December 15.
Frequently Asked Questions
Do I need to tell my employer about my self-employment?
From a tax or legal requirement standpoint, no — the CRA does not share your tax information with your employer. However, check your employment contract for conflict-of-interest policies. Some employers require disclosure of outside business activities, and non-disclosure of a conflict could be grounds for termination.
Can I deduct home office expenses even though I have a full-time job?
Yes, but only for the self-employment portion of your use. If you use a dedicated home office space exclusively for your freelance work, you can deduct a percentage of your home costs (rent or mortgage interest, utilities, internet) as a self-employment expense on Schedule T2125. You cannot deduct home office expenses against your employment income under the simplified employee home office method if you are no longer working from home due to COVID requirements.
Should I incorporate my side business?
Generally not until your self-employment income is consistently high enough (usually $80,000+) and you are leaving money inside the corporation rather than withdrawing it all. With both employment and self-employment income, incorporation adds complexity. A CPA can model whether the tax deferral benefit outweighs the additional administrative cost in your specific situation.