How the RRSP vs TFSA Decision Works
Both accounts shelter investment growth from tax — but the timing of taxation is different. The RRSP defers tax: you get a deduction now, but pay tax when you withdraw. The TFSA uses after-tax dollars: no deduction now, but withdrawals are completely tax-free.
If your marginal tax rate is the same today as in retirement, the two accounts produce mathematically identical results. The decision only matters when your tax rate changes:
Higher income now → RRSP wins
You deduct at a high rate today and withdraw at a lower rate in retirement. The tax arbitrage creates real wealth.
Lower income now → TFSA wins
Your RRSP deduction is worth less at a low rate. The TFSA shelters growth tax-free with no future tax drag.
Similar rates → TFSA for flexibility
When rates are close, the TFSA wins on flexibility: no mandatory withdrawals at 71, no impact on OAS/GIS clawbacks.
The OAS Clawback Trap
Large RRSP/RRIF withdrawals in retirement can trigger OAS clawback (also called the "OAS recovery tax") once income exceeds ~$90,997 (2026 threshold). For high-income retirees, TFSA withdrawals don't count toward this threshold — a significant advantage. This calculator does not model OAS clawback, which is another reason to consult an advisor for large portfolios.
Frequently Asked Questions
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