Mortgage prepayment savings
Every extra dollar goes straight to principal, so it saves interest for the rest of the mortgage.
Assumptions
- Semi-annual compounding, monthly payments, constant rate.
- Lump sum applied at the end of each year.
- Check your contract's annual prepayment limits.
General information, not financial advice. This calculator gives rough estimates from simplified assumptions. It does not know your full situation. Check with a qualified professional and the official sources before making decisions.
Sources
Figures checked October 16, 2026. Rules and limits change; confirm with the source before acting.