Mortgage structuring
Cash damming: making part of your mortgage interest tax-deductible.
If you own a rental property and also carry a mortgage on the home you live in, the order in which your money moves matters. With cash damming, your rental income goes toward paying down your home mortgage faster, while your rental property's expenses are paid from a separate line of credit. Because that borrowed money is used to earn rental income, the interest on it may be tax-deductible — so your total debt stays the same, but more of it sits on the side that carries a tax benefit.
How it works
Rental income goes straight onto your home mortgage
Instead of letting rent sit in your chequing account and drift into everyday spending, it gets applied against the mortgage on the home you live in.
Your non-deductible mortgage shrinks faster
The mortgage on your own home earns you no tax benefit, so it is the debt you want gone first. Directing rental income at it accelerates the payoff.
Rental expenses get paid from a separate line of credit
Repairs, property tax, condo fees, insurance and other costs of the rental are paid from a dedicated line of credit rather than out of your pocket.
That borrowed money may become deductible interest
Because the borrowed funds are used to earn rental income, the interest on that line of credit may be tax-deductible — moving your debt from "no tax benefit" to "tax benefit."
Who this tends to suit
Cash damming is worth a conversation if you own at least one rental property in Nova Scotia or elsewhere in Atlantic Canada, still carry a mortgage on your own home, and are comfortable keeping a dedicated account and line of credit tidy. The bigger your home mortgage relative to your rental debt, the more there is to shift.
It is not for everyone. If you have no income-producing property, if your own mortgage is nearly paid off, or if you would struggle to keep the accounts separated, the structure adds paperwork without much payoff. The honest answer often is that the numbers do not justify it — and Rahul will tell you that rather than set something up you don't need.
Common questions
Important disclaimer
This page is mortgage structuring and education, not tax, legal, or accounting advice. Whether interest is deductible depends on your specific facts and is determined by your accountant and the Canada Revenue Agency. The strategy is described in CRA Income Tax Folio S3-F6-C1 and rests on Income Tax Act 20(1)(c). It only works when the borrowed money genuinely earns income, the funds are kept cleanly traceable in a dedicated account, and proper records are kept. Confirm with a qualified accountant before acting, and involve a lawyer for any title, ownership, or security matter.
Talk to Rahul about your situation
Every setup depends on how your properties, accounts, and mortgages are already arranged. A short call will tell you whether this is worth building around — no pressure, and no fee for standard brokered files.