GIC in TFSA vs taxable account: the after-tax math that changes everything

A 4% GIC inside your TFSA will beat a 5% GIC in a taxable account. That's not a typo - it's what happens when you do the actual after-tax math instead of comparing sticker rates.

Here's why the numbers work this way. In a taxable account, your GIC interest gets added to your income and taxed at your marginal rate. At $70,000 in Ontario, that's roughly 30%. So a 5% GIC becomes 3.5% after tax. Your 4% TFSA GIC stays 4%.

The break-even point shifts with your income. At $50,000 in Ontario (about 24% marginal rate), a taxable 5% GIC gives you 3.8% after tax - still behind the TFSA. You'd need the taxable GIC to pay 5.25% just to match a 4% TFSA rate at that income level.

Most people get this backwards. They see a bank advertising 5.2% on a taxable GIC and 4.8% inside registered accounts, then choose the higher number. The bank's counting on that mistake.

What counts as GIC interest for tax

All of it. Every dollar of interest from a GIC in a taxable account goes on your tax return as income. No capital gains treatment, no splitting it across years - it all hits in the year you earn it, even if the GIC doesn't mature until later.

This includes compound interest. If you buy a 3-year GIC that pays 4.5% annually but compounds inside the term, you owe tax each year on the interest that accrued - whether you received cash or not.

The TFSA changes this completely. Interest earned inside the account never appears on your tax return. Withdraw the money in 5 years and the CRA has no interest in where it came from.

The provincial math

Your marginal tax rate determines how much that taxable GIC actually pays you. In Alberta at $80,000 (about 30.5% marginal rate), a 4.8% taxable GIC becomes 3.3% after tax. In Quebec at the same income (about 37% marginal rate), it becomes 3.0%.

The gap widens as you earn more. At $120,000 in Ontario (roughly 43% marginal rate), you'd need a taxable GIC paying 7% just to match a 4% TFSA rate. Banks don't usually offer those spreads.

TaxSplit.ca will show you the exact after-tax return for any GIC rate at your specific income and province.

When taxable GICs make sense anyway

If you've maxed your TFSA contribution room and have more to invest. The 2025 limit is $7,000, with cumulative room of $102,000 if you've been eligible since 2009.

If you're in an unusually low-income year - maybe between jobs or on parental leave - and your marginal rate is temporarily under 20%. At that point, a taxable 5% GIC keeps about 4% after tax, which competes with TFSA rates.

If you're holding the GIC for estate planning reasons and the interest goes to beneficiaries in lower tax brackets. But that's getting specific enough that you should talk to someone who knows your situation.

For most Canadians earning $40,000 to $150,000, the TFSA wins on GICs even when the rate looks lower. The after-tax number is what you actually keep.