Shelter Side Income From Top Tax
Your side hustle gets taxed at your highest rate — an RRSP wipes that tax out completely.
A guide, not advice.
This page explains general rules. Do your own research, confirm your numbers with the CRA (your My Account and Notice of Assessment are the official record) or the other official sources listed at the end, and talk to a qualified professional before acting.
Plain English
Here's the thing about having a side hustle on top of a regular job: Canada's tax system is progressive, so your side-hustle dollars sit on the very top of the pile and get taxed at whatever your highest rate is. If your day job pays $70,000, your side-hustle income starts getting taxed at the ~30% rate. By putting every dollar of side-hustle profit into an RRSP, you get a deduction that cancels out the tax on that income. It's like the side hustle went straight into retirement savings before the government took its cut.
Your day job pays $75,000. Your side hustle nets $15,000. That $15,000 is taxed at your top marginal rate of ~31.48% in Ontario — a $4,722 tax bill. If you contribute the full $15,000 to your RRSP, you get a $4,722 refund, completely neutralizing the tax on the side income. Net tax impact of the side hustle: $0.
Show the analysis
Side-hustle income is classified as self-employment income on the T1 and stacks above T4 employment income for marginal rate purposes. For an individual with $75,000 primary income (second federal bracket, 20.5% + 9.15% Ontario = 29.65%), additional side-hustle income between $75,000 and $107,785 faces the same 29.65–31.48% combined rate. An RRSP deduction equal to the net side-hustle income eliminates this marginal liability. The side income also generates 18% RRSP room for the following year, creating a self-reinforcing contribution cycle.
Primary salary: $75,000. Side hustle net profit: $15,000. Total income: $90,000. Marginal rate on $75K–$90K corridor (Ontario): 31.48%. Tax on side income: $15,000 × 31.48% = $4,722. RRSP contribution of $15,000: deduction saves $4,722. Net side-hustle tax: $0. Bonus: $15,000 generates $2,700 of new RRSP room (18%) for next year.
Edge cases
- If total income (salary + side hustle) remains below $58,523, the combined rate is only ~20% — consider TFSA instead to preserve RRSP room for higher-earning years.
- Self-employment income triggers both employer and employee CPP contributions (11.9%) — factor this additional cost into your side-hustle cash flow planning.
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Where this information comes from
This page is based on publications from the CRA, last checked against them on . The full list is below, and the official source always takes precedence over anything written here.
It is a general guide, not financial, tax or legal advice. Do your own research, confirm your own numbers in CRA My Account or with the official source, and talk to a qualified professional before making a decision. Canadian Financials is independent and is not affiliated with or endorsed by the CRA or any government.
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