Claim the Investment-Interest Deduction You Already Qualify For
Section titled “Claim the Investment-Interest Deduction You Already Qualify For”Objective — deduct interest already being paid on qualifying investment debt, where the deduction is available and simply is not being taken.
Risk level — -1 — Negative risk.
Risk justification — nothing about the borrower’s position changes; a deduction that is legally available is claimed. There is no state in which claiming a valid deduction leaves them worse off.
Benefit justification — unverified — needs Talbot.
Jurisdiction — Canada. U.S. treatment is materially different — IRC §163(d) caps investment-interest deductions at net investment income, and Canada has no equivalent — so U.S. applicability is not a translation of this record.
Prerequisites
Section titled “Prerequisites”- Existing borrowing whose proceeds were used to acquire income-producing property.
- Records tracing the borrowed money to that use.
Mechanism
Section titled “Mechanism”ITA §20(1)(c) permits deduction of interest on borrowed money used for the purpose of earning income from a business or property. The test is the use of the money, not the security behind the loan (Singleton), and an expectation of income — a dividend yield suffices — satisfies the purpose test (Ludco).
The strategy is bookkeeping, not financial engineering: identify interest already paid that meets the test, and claim it.
Benefits
Section titled “Benefits”- Reduces the after-tax cost of borrowing to
gross rate × (1 − marginal rate). At the Ontario top combined rate of 53.53%, a 7% loan costs 3.25% after tax (canada-investment-taxation.md§9.2). - Canada has no cap equivalent to the U.S. §163(d): where investment interest exceeds investment income, the excess is a loss from property that offsets any source of income — employment, business, pension, RRSP withdrawals — with a 3-year carryback and 20-year carryforward (§7.1–7.2).
None to the position. The risk is procedural: claiming a deduction the tracing does not support invites reassessment.
Failure modes
Section titled “Failure modes”- Claiming interest on borrowing whose proceeds went to an RRSP (not deductible, §6.5) or a TFSA (not deductible, §6.6). Both are common misconceptions.
- Claiming interest where borrowed and personal funds were co-mingled and the trace cannot be demonstrated — see interest-tracing-hygiene.
- Claiming after the investment was sold, without meeting the §20.1 conditions — see disappearing-source-continuation.
Record-keeping. Professional fees if the tracing needs reconstructing.
Tax considerations
Section titled “Tax considerations”This record is the tax consideration. The authoritative reference is CRA Income Tax Folio S3-F6-C1, Interest Deductibility (updated 2024).
Who it may suit
Section titled “Who it may suit”Anyone paying interest on money that was used to buy income-producing investments in a non-registered account.
Who should avoid it
Section titled “Who should avoid it”Anyone whose borrowing funded a registered plan or a purely growth position with no reasonable expectation of income — the deduction is not available and claiming it is a reassessment risk, not a strategy.
Implementation outline
Section titled “Implementation outline”- Identify every loan and what its proceeds actually bought.
- Confirm the investments are held in a non-registered account and produce (or reasonably expect to produce) income.
- Assemble the tracing documentation.
- Claim the interest as a carrying charge; where it exceeds investment income, carry the resulting non-capital loss back 3 years or forward 20.
Evidence status
Section titled “Evidence status”external-sourced — CRA Folio S3-F6-C1 and ITA §20(1)(c), via Core/_WorkingOn/Research/canada-investment-taxation.md §6.1–6.3, §7.1–7.2, §9.2. What is unverified — needs Talbot: how often this is actually missed in practice. No SDC evidence base establishes the size of the problem.
Counterarguments
Section titled “Counterarguments”- This is accounting, not a strategy. It is in the library because it is the highest-certainty action available to an already-leveraged borrower, and level -1 by construction.
Variants
Section titled “Variants”None. The deduction is available or it is not.
The Market Drop Wins fold-in — decided 2026-09-22
Section titled “The Market Drop Wins fold-in — decided 2026-09-22”Market Drop Wins’ T3-6 Interest deductibility optimization maps onto this record and interest-tracing-hygiene together. No new record is created — its two claims are already held here, one in each:
| Market Drop Wins’ claim | Where it lives |
|---|---|
| ”Lowers after-tax carry” | this record — already quantified here at the Ontario top rate |
| ”Tracing rules are unforgiving” | interest-tracing-hygiene |
What it adds is context, not mechanism: deductibility is the single largest lever on the cost side of any decline-deployed leverage, which is why post-decline-deployment lists it as a tax consideration rather than an optional refinement. The deduction does not change that strategy’s tier and is not a reason to leverage.
Source: market-drop-wins-library-v2 T3-6.
Related strategies
Section titled “Related strategies”interest-tracing-hygiene · disappearing-source-continuation · better-rates-investment-loan · rrsp-catch-up-loan · borrow-to-fund-tfsa
Sources
Section titled “Sources”- CRA Income Tax Folio S3-F6-C1 Interest Deductibility (updated 2024) —
Core/_WorkingOn/Research/LevPublications/Leverage-Publications-Summaries.md, Canada / regulatory Core/_WorkingOn/Research/canada-investment-taxation.md§6.1–6.3 (purpose test, Singleton, Ludco), §6.5–6.6 (RRSP/TFSA exclusions), §7.1–7.2 (no cap; non-capital losses), §9.2 (after-tax cost)
Open questions
Section titled “Open questions”- Whether SDC should publish tax-procedural content at all, given the unlicensed boundary in
SDC/Risks/Canada-Leverage-Compliance.md§4. Routes to Risks.