On a $400,000 loan (25 years remaining):
- 0.25% rate drop → save $62/month ($18,600 over loan life)
- 0.50% rate drop → save $125/month ($37,500 over loan life)
- 1.00% rate drop → save $253/month ($75,900 over loan life)
On a $600,000 loan (25 years remaining):
- 0.25% rate drop → save $93/month ($27,900 over loan life)
- 0.50% rate drop → save $188/month ($56,400 over loan life)
- 1.00% rate drop → save $380/month ($114,000 over loan life)
On an $800,000 loan (25 years remaining):
- 0.25% rate drop → save $125/month ($37,500 over loan life)
- 0.50% rate drop → save $251/month ($75,300 over loan life)
- 1.00% rate drop → save $507/month ($152,100 over loan life)
These numbers assume you keep repayments at the original level and redirect savings to the loan. The compounding effect is significant over 20+ years.