Let's say you made 7 consecutive $5,000 lump sum payments each year at 12 months apart;
In other words, you made a lump sum payment for $5,000 on Month 1; another lump sum payment for $5,000 on Month 13; and the final lump sum payment of $5,000 on Month 73.
How much interest would this save you?
$100,000 Mortgage
30 Year Term - 6% APR
Monthly Lump Sum Payments
$0
7 - $5,000
Total Payments
$215,838.19
$107,319.54
Total Interest Paid
$115,838.19
$41,785.34
Total Principal Paid
$100,000.00
$100,000.00
Total Interest Saved
$74,052.85
Mortgage Payoff Time
30 Years
14 Years
$200,000 Mortgage
30 Year Term - 6% APR
Monthly Lump Sum Payments
$0
7 - $5,000
Total Payments
$431,676.38
$349,775.27
Total Interest Paid
$231,676.38
$133,695.03
Total Principal Paid
$200,000.00
$200,000.00
Total Interest Saved
$97,981.35
Mortgage Payoff Time
30 Years
20.9 Years
The Magic is Paying Up-Front
The goal is to get more of your monthly payment paying off the principal. By making large lump sum payments up-front, you can reach your mid-point must quicker.
In our example above, we were able to meet the mid-point as follows:
$100,000 loan: 5.2 years(vs. 18.6 years with no lump-payments)
$200,000 loan: 9.3 years (vs. 18.6 years with no lump-payments)
mid-point is where your mortgage payment begins to pay more on principal than on interest
Download this spreadsheet to run your own numbers.