- An RRSP contribution reduces your taxable income by the contributed amount — the refund is the tax saved on that reduction.
- Your RRSP room is 18% of last year's earned income (up to an annual cap), plus any unused room carried forward.
- The refund isn't free money — withdrawals in retirement are fully taxable, so the real benefit depends on your tax rate then vs. now.
- Hunch tracks your RRSP room and contributions automatically as you connect your accounts.
How the RRSP refund calculator works
Enter your province, employment income, and RRSP contribution amount. The calculator applies your marginal tax rate (combined federal and provincial) to the contribution to estimate the tax refund, and separately calculates your available contribution room for the year.
The math: marginal tax rate on the deduction
An RRSP contribution is a tax deduction, not a credit — it reduces the income you're taxed on by the full contributed amount. The refund is approximately your marginal tax rate (the rate on your last dollar of income) multiplied by the contribution, since the deduction effectively removes income from your top bracket first. Contribution room is 18% of the prior year's earned income, capped at an annual dollar maximum set by the CRA, plus any carried-forward unused room from previous years.
Worked example
On $85,000 of employment income in Ontario, a $10,000 RRSP contribution falls in a marginal tax bracket of roughly 31%, producing an estimated refund of about $3,100. Room for the year would be 18% of the prior year's income (roughly $15,300, capped at the annual maximum) plus any carried-forward room.
Key terms
- RRSP
- Registered Retirement Savings Plan — a tax-deferred Canadian retirement account; contributions are deducted from taxable income now, withdrawals are taxed in retirement.
- Marginal tax rate
- The tax rate applied to your next (or last) dollar of income — the rate that matters for calculating the value of a deduction.
- Contribution room
- 18% of the prior year's earned income (up to an annual dollar cap), plus unused room carried forward from previous years.
- Tax deferral
- Postponing tax on income until a later date (withdrawal) rather than avoiding it — the core RRSP mechanism, as opposed to a TFSA's permanent tax exemption.
