Your amortization can quietly reset at renewal and what that really costs...
A lot of homeowners assume that when they renew their mortgage, the only thing changing is the interest rate. In reality, one of the most powerful variables is the amortization period.
Your amortization is the total time remaining to pay off the mortgage. If you started with a 25-year amortization and are now five years into your mortgage, you would typically have about 20 years left. At renewal, some lenders may allow you to extend that remaining amortization back to 25 years, and in some cases even longer if the situation allows. This can significantly reduce your monthly payment, which is why many borrowers consider it when rates are higher.
For example, let’s assume you have a $400,000 mortgage balance at 4.24%.
- If you keep the remaining amortization at 20 years, your monthly payment would be approximately $2,468, and the total interest paid over the remaining amortization would be roughly $192,000.
- If you extend the amortization back to 25 years, your monthly payment would drop to approximately $2,151, which saves about $317 per month in cash flow.
That sounds attractive, but there is a tradeoff.
Over 25 years, the total interest paid would increase to roughly $245,000. In other words, extending the amortization lowers the payment by about $317 per month, but increases the total interest cost by approximately $53,000 if you keep that structure for the full amortization.
For some homeowners, that tradeoff is absolutely worth it. Lowering the payment can provide breathing room, improve cash flow, and reduce financial stress. Others may choose to keep the longer amortization temporarily and then use lump sum payments or payment increases later to reduce the balance faster. For others, keeping the shorter amortization makes more sense because they want to minimize interest and become mortgage-free sooner. Neither approach is automatically right or wrong. It depends on your cash flow, goals, and how you plan to use the flexibility.
The key takeaway is that amortization can have a much bigger impact on your payment than most people realize, but there is always a cost to stretching the mortgage over a longer period.
Would you rather save $317 per month now, or pay the mortgage off faster and save roughly $53,000 in interest?