Cash Damming Technique

Cash Damming Technique

The cash damming technique lets you reduce your income taxes by gradually converting your personal debt, for which interest is not deductible, into a new debt to cover your business expenses, for which interest is fully deductible.

This tax strategy is for self-employed workers, individual business owners, rental property owners and members of a general partnership.


  • Be an individual operating an unincorporated business.
  • Earn high taxable income.
  • Have substantial personal debts (residential mortgage, auto loan, credit card, etc.).
  • Have substantial business expenses.

How it works

Cash damming requires that you use:

  • 2 separate Personal Chequing Accounts to segregate your gross income from business expenses;

You use your gross income to:

  • cover personal expenses;
  • pay your business debts (if applicable);
  • pay back your personal debts sooner, the interest of which is not deductible.

You finance 100% of your business expenses with the Versatile Line of Credit cash advances. Your Versatile Line of Credit could also facilitate future financing of personal projects (cottage, boat, new car, etc.).


An individual in business with a $150,000 mortgage, amortized over 25 years, could save a total of $62,061 in taxes.


10 years

25 years

Personal debt converted into business debts


Tax savings


Tax savings











Cash damming has been accepted by tax authorities since 2002.

See a Caisse populaire advisor to find out if you are eligible and to discuss with you the relevance of this tax strategy, based on your situation and needs.

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