Cash Damming is a legal tax strategy for unincorporated Canadian business owners or rental property investors. Instead of using your gross business revenue to pay business expenses, you use it to pay down your personal, non-deductible mortgage. You then borrow back from a business line of credit to pay your operational expenses, transforming personal debt into fully tax-deductible business debt.
Understanding Cash Damming
In Canada, managing your debt efficiently is the key to building wealth. If you are an unincorporated professional (like a freelance consultant, a medical professional, or an owner of rental properties in cities like Edmonton, Winnipeg, or Halifax), you likely have two types of expenses: business and personal. The Canada Revenue Agency (CRA) allows you to deduct the interest on money borrowed to run your business. However, you cannot deduct the interest on your personal home mortgage.
The Cash Damming strategy “dams up” your cash flow. 📍 Normally, a business owner deposits their revenue and immediately uses it to pay for inventory, office supplies, or property taxes. With Cash Damming, you divert 100% of your gross business revenue to aggressively pay off your personal mortgage. To keep your business running, you use a dedicated Line of Credit to pay for all your business expenses. Because that line of credit is used exclusively for business, the interest on it is 100% tax-deductible.
Step-by-Step Process in Canada
Precision is everything with this strategy. If you co-mingle your personal groceries with your business expenses on the same credit line, the CRA will reject your interest deductions.
Step 1: Set Up the Right Financial Accounts
You need a very clear banking structure. First, you must have a personal mortgage that allows for flexible prepayments. Second, you must open a dedicated Business Line of Credit (or a Home Equity Line of Credit structured solely for the business). Third, ensure you have a dedicated business chequing account.
Step 2: Direct Gross Income to Your Mortgage
When you get paid by clients or receive rent from your tenants, take that gross income and apply it directly as a prepayment against your personal, non-deductible mortgage. 💰 Do not hold it in your business account to pay the upcoming utility bills. The goal is to aggressively crush your bad debt.
Step 3: Pay Business Expenses from the Line of Credit
When it is time to pay your business expenses—such as marketing, rent, supplies, or property maintenance—do not use cash. Instead, draw the exact amount needed from your dedicated Business Line of Credit. Transfer it to your business chequing account and immediately pay the vendor.
Step 4: Claim the Interest Deduction
Because every dollar drawn from that line of credit was used to produce business income, the interest charged by the bank is legally tax-deductible. When filing your T1 General tax return, your accountant will deduct this interest against your business or rental income, significantly lowering your overall tax bill.
How Much Does it Cost in Canada?
Implementing Cash Damming requires some initial setup costs to ensure you stay compliant with the CRA. 💵
| Service | Estimated Cost (CAD) | Details |
|---|---|---|
| HELOC Setup / Legal Fees | $500 – $1,500 | Registering a new line of credit against your home requires legal and appraisal fees. |
| Accounting Services | $500 – $1,200 annually | Tracking the interest and ensuring clear separation of funds requires a skilled CPA. |
| Interest Expense | Varies | You will pay interest on the credit line, but this is offset by the tax savings. |
How Long Does the Process Take?
Once your accounts are set up, which usually takes 2 to 4 weeks at a major Canadian bank, the actual strategy runs on a monthly cycle. How quickly you convert your personal mortgage into a business loan depends on your gross revenue. If your business grosses $100,000 CAD a year and your mortgage is $300,000, it will take roughly 3 to 4 years to fully “dam” the cash flow and convert the debt.
Frequently Asked Questions (FAQ)
Does Cash Damming work for incorporated businesses?
No. Cash Damming is specifically designed for sole proprietors, partnerships, and individual rental property owners. If your business is incorporated, it is a separate legal entity, and transferring corporate revenue to your personal mortgage without paying yourself a taxable salary or dividend is illegal.
Is this a CRA red flag?
While perfectly legal and supported by the Supreme Court of Canada (Singleton case), it does attract CRA scrutiny. You must maintain perfect records proving the borrowed money was used exclusively for business expenses.
Can I use this for my everyday living expenses?
No. If you draw from the line of credit to buy personal groceries or take a vacation, the interest on that specific portion of the loan is no longer tax-deductible.
What happens when my personal mortgage is fully paid off?
Once the personal mortgage is eliminated, you simply stop drawing from the line of credit and use your gross business income to pay off the business loan.
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