Spending the RRSP Refund: Why It Changes the RRSP vs. TFSA Math

The RRSP Refund Is Part of the Investment Decision

Suppose you have $10,000 to invest. A $10,000 TFSA contribution and a $10,000 RRSP contribution look equal, but they are not equal in cost. At a 40% marginal income tax rate, the RRSP deduction reduces your tax by about $4,000 ($10,000 × 40% = $4,000). The RRSP route then leaves you with $10,000 invested plus $4,000 of tax savings. The TFSA route leaves you with $10,000 invested and no deduction.

What happens to the $4,000 determines what you are really comparing.

There are two related ways to make that comparison. One is to compare the same nominal contribution, in this example, $10,000 into either account. The other is to compare the same net cost today, which is how much spendable money the investor actually gives up. Both are useful, but they are not the same question.

One qualification: real tax calculations are progressive. A large deduction can span several brackets, so the whole contribution may not save tax at a single rate. The flat 40% used here is a deliberate simplification that keeps the arithmetic visible. You can see the refund at your income level with the RRSP Contribution Room and Tax Refund calculator.

Three Strategies, Same Assumptions

Every scenario in this article uses a 7% annual return over 20 years. The growth factor is 1.07²⁰ ≈ 3.8697, so $10,000 grows to $38,697.

For simplicity, the examples assume the tax savings are invested at the same time as the original contribution. A refund received and invested later would have slightly less time to compound. They also assume your marginal tax rates at contribution time and withdrawal time are identical. In reality, those rates can differ.

Scenario 1: $10,000 contributed to the TFSA. The withdrawal is tax-free. Final after-tax value: $38,697. ($10,000 × 1.07²⁰ ≈ $38,697)

Scenario 2: $10,000 contributed to the RRSP, refund spent. The RRSP grows to $38,697. A 40% withdrawal tax leaves $38,697 × 60% = $23,218. This looks far worse than the TFSA, and for retirement wealth it is. But it does not mean the RRSP destroyed $15,479 of value. Instead, the RRSP investor spent $4,000 twenty years earlier, and the TFSA investor did not.

There is another way to consider the same result. Once the $4,000 tax savings are spent, the investor's net cost was only:

$10,000 − $4,000 = $6,000

A $6,000 TFSA invested under the same assumptions grows to:

$6,000 × 3.8697 = $23,218

Exactly the same as the after-tax RRSP.

So spending the refund does not make the RRSP itself mathematically worse. The investor simply saved $6,000 on an after-tax basis and consumed the other $4,000.

Scenario 3: $10,000 contributed to the RRSP, refund invested. Assume the $4,000 refund goes into a TFSA, with sufficient TFSA contribution room, so it adds no future tax liability.

• RRSP after 40% withdrawal tax: $38,697 × 60% = $23,218
• Invested refund: $4,000 × 3.8697 = $15,479, tax-free
• Total: $23,218 + $15,479 = $38,697

^*The fully grossed-up RRSP is explained below.

The refund is the piece that completes the comparison.

Why the RRSP and TFSA Can Produce the Same After-Tax Result

Let C be the RRSP contribution, t₁ the tax rate when contributing, t₂ the tax rate when withdrawing, and G the growth multiplier. If the refund is invested in a TFSA, the after-tax result is:

C × G × (1 − t₂) + C × t₁ × G

Factoring out C × G gives:

C × G × [(1 − t₂) + t₁]

When t₁ = t₂, the bracket equals (1 − t) + t = 1, and the result is simply C × G. That is exactly what the TFSA produces. With equal tax rates, paying the tax before the money grows or after it grows gives the same answer when the RRSP tax savings are also invested without additional tax drag, as in the TFSA example here.

If the refund is instead invested in a non-registered account, taxes on investment income can prevent the results from being exactly equal.

The broader account-selection math appears in our RRSP vs TFSA vs FHSA comparison.

What If Your Retirement Tax Rate Differs?

Keep a 40% contribution rate and change only the withdrawal rate. The RRSP still grows to $38,697, and the invested refund still grows to $15,479.

At 30%, the RRSP is $38,697 × 70% = $27,088, and adding $15,479 gives $42,567. At 50%, the RRSP is $38,697 × 50% = $19,348, and adding $15,479 gives $34,827. The RRSP-plus-invested-refund strategy wins when the deduction is claimed at a higher rate than the withdrawal is taxed, and the TFSA wins when the reverse is true.

A fully grossed-up RRSP with the same $10,000 net cost produces somewhat different results because all of the money remains inside the RRSP and is eventually taxed at the withdrawal rate. At 30%, 40%, and 50% withdrawal tax rates, its final after-tax values would be approximately $45,146, $38,697, and $32,247, respectively.

The central question therefore becomes: will the tax rate on this RRSP money in retirement be lower than, similar to, or higher than the rate saved when the deduction was claimed? Other factors also matter, including income-tested benefits, RRIF withdrawals, liquidity, estate planning, and contribution room, but this is the core tax arithmetic.

Spending the Refund Does Not Make the RRSP “Bad”

Someone who contributes $10,000 and spends the $4,000 refund on a vacation ends up with a smaller after-tax RRSP than the TFSA portfolio in our example. That outcome is not automatically a mistake. They received $4,000 of spending money twenty years sooner, and money today has real value.

The narrower conclusion is this: if the goal is to maximize long-term invested wealth, spending the refund weakens the RRSP strategy because part of the tax advantage is never invested.

Paying Down Debt Is Not the Same as Spending

The refund has more than two possible destinations. It can be consumed, invested, held as cash, used for another financial goal, or used to repay debt. Putting $4,000 against a credit card charging 20% does not put money in an investment account, but it removes a liability that would otherwise cost interest every year. The benefit of repaying a mortgage or other debt depends on the interest rate and on whether that interest is deductible. That comparison is worked through in Pay Off Your Mortgage Faster or Invest? and in the Pay Off Mortgage vs. Invest calculator.

What Does “Reinvest the Refund” Mean?

The refund can be invested in a TFSA, an RRSP, other registered accounts (FHSA, RESP, RDSP) if eligible, or a non-registered account. This article uses the TFSA because, assuming sufficient contribution room, the refund can then grow without creating another future tax bill.

A fully grossed-up RRSP is what you end up with when each round of tax savings is contributed back into the RRSP. At a 40% marginal rate, a $10,000 contribution produces $4,000 of tax savings. Contributing that $4,000 produces another $1,600 of tax savings, which can also be contributed, producing another $640, and so on. Added together, the contributions total $16,667 and the tax savings total $6,667, so your net cost is still the original $10,000.

Rather than adding up each round individually, the shortcut is to divide the desired net cost by one minus the tax rate:

$10,000 ÷ (1 − 0.40) = $16,667

After 20 years the RRSP is worth $16,667 × 3.8697 = $64,495, and after 40% tax it is worth $38,697. This matches the TFSA result, which makes it another clean equal-cost comparison.

In practice, the investor must have enough RRSP contribution room. Someone starting with only $10,000 of cash would also need a way to fund the additional $6,667 before the tax savings arrive, such as other available cash or reduced payroll withholding.

Why “$10,000 in Each Account” Misleads

Comparisons that put $10,000 in an RRSP and $10,000 in a TFSA, tax the RRSP on withdrawal, and declare the TFSA the winner ignore the deduction. The opposite error also appears: treating the refund as a free bonus. Ignoring the refund makes the RRSP look artificially bad, and treating it as free money makes the RRSP look artificially good. The useful comparison includes both sides, consistent with how the CRA describes the RRSP: deductible contributions, sheltered growth, taxable withdrawals.

The term “refund” can also mislead. The real benefit is a reduction in income tax. It may arrive as a larger refund in April, or as higher take-home pay through the year if payroll withholding is adjusted. The question is the same either way: what happens to the tax savings?

The Behavioural Problem

A TFSA contribution has no refund attached, so nothing arrives later that can become spending money. With an RRSP, the tax benefit is separated from the contribution by weeks or months. A person can contribute $10,000, feel that the full amount was saved, receive $4,000 back, spend it, and still credit themselves with the full RRSP advantage. They saved $10,000, but part of the tax advantage became current consumption.

Over decades, the difference compounds. In our example the $4,000 refund grows to $15,479 over 20 years and to more than $30,000 over 30 years at 7% ($4,000 × 7.6123 = $30,449).

As a one-time decision, spending the $4,000 refund results in the opportunity cost shown above. But the larger effect comes when the same choice is repeated year after year. Suppose an investor makes an RRSP contribution each year that generates roughly $4,000 of tax savings (for example, a $10,000 contribution at a 40% marginal rate) and invests each refund at the end of that year at 7%. Those annual investments would grow to roughly $164,000 after 20 years from $80,000 of deposits, or $378,000 after 30 years from $120,000 of deposits. Unlike the one-time examples above, which assume the tax savings are invested at the same time as the contribution, this recurring example assumes each refund is invested at year-end, a more conservative approximation of when refunds actually arrive. The same year-end deposits can be projected with the Simple Investment Calculator.

A Better RRSP vs. TFSA Question

“Which gives me the bigger refund?” and “Which account has the bigger balance?” are both incomplete questions. A better one is:

For the same net cost today (the amount of spendable money I actually give up), how much after-tax wealth will each strategy eventually produce?

That question forces the deduction into the calculation, as well as the taxable vs. tax free withdrawal differences between TFSAs and RRSPs. If the tax rate is the same going in and coming out, the RRSP and TFSA are equivalent under the simplified model when the tax savings remain invested without additional tax drag. If the rate is lower at withdrawal (as can occur when people make withdrawals during retirement), the RRSP strategy gains an advantage. If the rate is higher at withdrawal, the TFSA gains an advantage. Spending the savings is a fourth choice: taking part of the benefit now instead of compounding it.

The Long Math

Assumptions throughout: $10,000 contribution, 40% marginal rate when contributing, 20 years, 7% annual return, 40% marginal rate when withdrawing.

A meaningful RRSP vs. TFSA comparison requires deciding what happens to the RRSP tax savings and being clear about whether you are comparing the same contribution or the same net cost.

Spending the tax savings, investing them, and using them to repay debt are different financial strategies, and the account is only one part of the equation.

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