Borrowing to Fund a TFSA
Section titled “Borrowing to Fund a TFSA”Objective — borrow to make a Tax-Free Savings Account contribution, so the borrowed amount grows tax-free.
Risk level — 3 — Higher risk.
Risk justification — borrowed money is placed at market risk with no interest deduction to offset the cost, so the hurdle rate is the full pre-tax borrowing rate rather than the after-tax rate that makes non-registered leverage work. level 3 rather than level 2 because the strategy is commonly attempted on a misunderstanding of its tax treatment, which is a failure of the premise rather than of execution.
Benefit justification — unverified — needs Talbot.
Jurisdiction — Canada.
Prerequisites
Section titled “Prerequisites”- TFSA contribution room: $7,000 for 2024 and 2025; cumulative room since 2009 was $95,000 as at 2025.
- Capacity to repay the loan from income regardless of what happens inside the plan.
Mechanism
Section titled “Mechanism”Money is borrowed and contributed to a TFSA, and invested inside it. Growth and withdrawals are tax-free.
The interest is not deductible. Income earned inside a TFSA is exempt — it does not enter the taxpayer’s income — so the purpose of the borrowing is to earn exempt income, which fails the ITA §20(1)(c) income-earning purpose test. The source states this position “is consistent with the structure of §20(1)(c) and is not controversial.”
Benefits
Section titled “Benefits”- Growth inside the plan is tax-free, and withdrawals do not affect income-tested benefits.
- Contribution room is restored the following year after a withdrawal.
- No deduction means no tax arbitrage. The whole Canadian case for borrowing to invest rests on deducting interest at the full marginal rate while investment returns are taxed preferentially (
canada-investment-taxation.md§9.4). Inside a TFSA that mechanism is absent, and a 7% loan costs 7%. - Market risk with a fixed repayment obligation.
- Non-qualified investments and “advantages” attract punitive taxes under ITA §207.05.
- Prohibited-investment rules apply: a TFSA cannot hold investments in which the holder has a significant interest.
Failure modes
Section titled “Failure modes”- Believing the interest is deductible. The single failure this record exists to prevent, and a documented misconception alongside the same error for RRSP loans.
- Comparing a TFSA loan to a non-registered investment loan on rate alone, without adjusting for the missing deduction.
- Withdrawing to service the loan and re-contributing in the same calendar year, creating an over-contribution.
Non-deductible interest for the life of the loan.
Tax considerations
Section titled “Tax considerations”ITA §20(1)(c) purpose test fails for exempt income (§6.6). Contribution limits and prohibited-investment rules under §11.2. Punitive taxes under §207.05 for non-qualified investments and advantages.
Who it may suit
Section titled “Who it may suit”unverified — needs Talbot. Structurally, the case is narrow: a short loan at a low rate where the expected tax-free return clearly exceeds the full pre-tax borrowing cost — and the strategy still carries market risk with a fixed obligation.
Who should avoid it
Section titled “Who should avoid it”Most people. Anyone who believes the interest is deductible; anyone comparing it to a non-registered loan without adjusting for that; anyone who would need to withdraw to repay.
Implementation outline
Section titled “Implementation outline”Deliberately not provided. Under Rule 1 an level 3 record gets objective education only, and the education here is that the hurdle rate is the full borrowing rate.
Evidence status
Section titled “Evidence status”external-sourced — Core/_WorkingOn/Research/canada-investment-taxation.md §6.6 (non-deductibility and the reasoning) and §11.2 (contribution room, prohibited investments, punitive taxes). Not modelled in sd-math — account_type="tax_free" deliberately raises NotImplementedError rather than applying the taxable model to an account it does not describe.
Counterarguments
Section titled “Counterarguments”- For a young investor with a long horizon and a very low borrowing rate, tax-free compounding may still beat the cost. Possible; the record’s position is that the comparison must use the full rate, and SDC has computed no such comparison.
Variants
Section titled “Variants”None. It either qualifies for a deduction or it does not, and it does not.
Related strategies
Section titled “Related strategies”rrsp-catch-up-loan · claim-investment-interest-deduction · interest-only-investment-loan
Sources
Section titled “Sources”Core/_WorkingOn/Research/canada-investment-taxation.md§6.6, §11.2, §9.4~/projects/monorepo/packages/sd-math/docs/accuracy-audit.md§4 — account types: onlytaxableis modelled;tax_freeraisesNotImplementedErrorby design
Open questions
Section titled “Open questions”- Whether an “anti-strategy” record belongs in the library as a record or as a myth entry. It is included as a record because the library sorts by risk, and a strategy people actually attempt needs a tier.