HISA inside TFSA or RRSP: guaranteed rate, tax-free growth

A high-interest savings account inside your TFSA earns 4-5% with no tax on the interest. The same HISA in a regular account gets taxed as income - so at a 30% marginal rate, that 4.5% becomes 3.15% after tax.

The math is simple. The decision isn't always.

What a HISA actually is

A HISA is just a savings account that pays more interest than the 0.05% your bank offers on regular savings. Most online banks and credit unions offer rates between 3.5% and 5% right now. The rate isn't guaranteed forever - it moves with Bank of Canada policy - but it's guaranteed not to lose principal.

Unlike a GIC, you can withdraw anytime. Unlike a regular savings account, the interest rate isn't insulting.

Inside a TFSA

Put a HISA inside your TFSA and the interest compounds tax-free. No T5 slip. No adding the interest to your taxable income. The account grows and you keep every dollar.

This works well for emergency funds, short-term goals, or money you'll need within two years. If you're saving for a car, vacation, or home down payment, a HISA in your TFSA gives you guaranteed growth without tying up the money.

The catch: you're using TFSA contribution room that could hold investments with higher long-term returns. At $7,000 per year, that room is limited. A HISA earning 4% is fine for money you need soon. For money you won't touch for 10 years, stocks historically do better.

Inside an RRSP

A HISA inside an RRSP makes less intuitive sense, but it has uses. The interest still grows tax-sheltered - you don't pay tax until you withdraw from the RRSP decades later.

This combination works if you're risk-averse about your retirement savings, or if you're close to retirement and want guaranteed returns without market volatility. Some people also use it as a temporary holding spot - contribute to the RRSP for the immediate tax refund, then move the money into investments later.

The obvious problem: RRSPs are designed for decades of growth. A 4% HISA won't keep pace with inflation over 30 years. You get the tax deduction now, but you're trading long-term purchasing power for short-term certainty.

When it makes sense

HISA inside TFSA: when you need the money within five years, want zero risk, and have other investment accounts for long-term growth.

HISA inside RRSP: when you're within 10 years of retirement, already have sufficient equity exposure, or need time to decide on investments but want the RRSP deduction this tax year.

HISA in a regular taxable account: when your TFSA is full and you need guaranteed, liquid savings for emergencies.

The rates change. Right now they're decent enough to consider. In 2020 they were under 2%. In the 1980s they hit double digits. TaxSplit.ca shows what the after-tax return looks like based on your marginal rate.

If you're using TFSA room for a HISA, you're prioritizing certainty over growth. That's not wrong - it's a choice. Just know what you're trading off.