The chart below shows what you would accomplish paying an extra $100 a month on a 5% interest mortgage amortized for thirty years.

 

$100 a Month Extra Payment Time Saved Total Interest Saved
Years 1-5 1 year 2 months

$17,025

Years 5-10 11 months

$12,290

Years 10-15 8 months

$8,304

Years 15-20 7 months

$5,170

Years 20-25 5 months $2,708
Years 25-30 4 months $785