Effective Interest on Amortization

binarian

New member
Joined
Aug 21, 2021
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I don't know how to calculate the correct number. Here's a scenario:

Original Loan Amount: $400,000
Interest Rate: 6%
Monthly Payment: $2398.20
Term: 360 months

I am also offered a competitor's scenario.

Competitor Loan Amount: $400,000
Interest Rate: 5%
Monthly Payment: $2147.29
Term: 360 months

The difference is: $2398.20 - $2147.29 = $250.90

If I apply the difference to the competitor's loan so:

Loan Amount: $400,000
Interest Rate: 5%
Monthly Payment + difference: $2398.20
Term: 360 months (shortened to 286 months because of extra payment)

What is the effective interest rate? Should it be lower than 5%?

BTW, the Competitor's loan with NO Extra Payment has total term interest of $463,352.76 but WITH extra payment the total term interest is $284,914.59

Some company's marketing material states the effective interest rate based on extra payment as lower than stated interest rate but I don't know how to calculate it.
 
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