General information only — not financial advice for your situation.
This is a learning tool. Always check CRA My Account records and talk to a qualified professional for your own numbers.
Plain English
When you don't earn much, the government gives you extra help in retirement called GIS (Guaranteed Income Supplement). But here's the catch: if you pull money out of an RRSP in retirement, the government counts that as income and takes away some of your GIS. A TFSA doesn't have that problem. The government doesn't count TFSA withdrawals as income at all. So your savings stay hidden from the clawback, and you keep your full benefits.
You earn $30,000 and contribute $2,000 to an RRSP. You get about a $381 refund now (19.05% rate). But in retirement, when you withdraw that $2,000 from your RRIF, the GIS clawback takes back 50 cents for every dollar above the threshold — potentially costing you $1,000 in lost GIS, far more than the $381 you saved. The TFSA avoids all of this.
Show the analysis
At approximately $30,000 of income, the combined Ontario marginal rate is roughly 19.05%. An RRSP deduction generates $0.19 per dollar of tax relief. However, in retirement, RRIF withdrawals are classified as taxable income under the GIS calculation. The GIS clawback rate is effectively 50% on income above the exemption threshold. This creates a combined marginal withdrawal rate (income tax + GIS clawback) that can exceed 70% for low-income retirees, producing catastrophic negative arbitrage versus the 19% contribution-phase deduction.
Contribution phase: $2,000 × 19.05% = $381 refund. Withdrawal phase (retirement at ~$20,000 income): federal + provincial tax ~15% + GIS clawback ~50% = effective 65% rate on RRIF withdrawal. Net cost: $2,000 × 65% = $1,300 tax + lost benefits, versus $381 saved. Net loss: $919 per $2,000. TFSA alternative: $0 tax on withdrawal, $0 GIS impact.
Edge cases
- The GIS clawback rate is approximately 50% for single seniors and 25% per spouse for couples — both are devastating when stacked on income tax.
- Employment income below the $16,452 BPA produces 0% effective tax — RRSP contributions at this level are mathematically worthless.
Keep exploring
About this site
Every number on this site is sourced from CRA publications, the Income Tax Act, or provincial fiscal releases. We show the math, cite the sources, and never tell you what to do with your money.