An open mortgage can be repaid in part or in full at any time without triggering a prepayment penalty, while a closed mortgage locks you into set terms for the duration of your term and charges a penalty if you pay it off early, renegotiate, or refinance before maturity. The tradeoff is cost: open mortgages carry significantly higher interest rates than closed mortgages because the lender takes on more uncertainty about how long the loan will remain outstanding.
Most Canadian homebuyers choose closed mortgages. The lower interest rate results in lower monthly payments and less total interest paid over the term, which makes a closed mortgage the more affordable option for anyone planning to stay in their home for the foreseeable future. Closed mortgages are available across a range of terms, though the five-year fixed term remains the most popular choice among Canadian borrowers. Even within a closed mortgage, most lenders provide some prepayment privileges. These typically allow you to make annual lump-sum payments of 10 to 20 percent of the original principal amount and to increase your regular payment by a similar percentage, all without penalty.
The penalty structure is where the distinction matters most in practical terms. If you need to break a closed fixed-rate mortgage before the end of its term, the penalty is generally the greater of three months of interest or the interest rate differential, which is a calculation based on the gap between your contracted rate and the lender's current rate for a comparable remaining term. The earlier you are in your term, the larger this penalty tends to be. For a closed variable-rate mortgage, the penalty is typically three months of interest. These costs can amount to thousands of dollars on a typical Toronto mortgage balance.
An open mortgage makes sense in a narrow set of circumstances. If you are expecting a large financial windfall, planning to sell your property within the next few months, or buying a new home before your current one has sold, the flexibility to pay down or pay off your mortgage without penalty can outweigh the higher rate. Some lenders also offer convertible mortgages that start as open or short-term products and can be converted to a longer closed term without a penalty, providing a middle ground.
Your mortgage broker or lender can help you compare the total cost of each option against your expected timeline. Understanding the difference between open and closed mortgages before you commit ensures you are not paying for flexibility you do not need or, conversely, locking yourself into penalties you cannot afford.
