eli5 – why does housing loan monthly payment rise sharply due to interest rate increases?

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Example scenario

Loan amount – 500K, loan period – 20 yrs

Interest rate original / hike – 1% / 5%

Monthly payment original / increase – 2.3K / 3.3K

That is a 30 percent increase in monthly loan payments for a 4 percent rate increase.

Why?

Calculated using online calculator

In: 0

8 Answers

Anonymous 0 Comments

Depends where you’re located. In the US, the vast majority of mortgages are fixed rate 15 or 30 year loans, so existing loans aren’t impacted by rate increases.

But, yes 4% increase in interest rate could cause a 50% payment increase because the way loans are amortized, that 4% is applied per year to the remaining balance for the remaining years.

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