Interest-Only Calculator

Compare your interest-only payment vs. what you'll pay once principal amortization kicks in — and the total interest cost of each.

$
%
1 yr15 yrs

Interest-Only Payment

$2,917/mo

Years 1–10

Amortizing Payment

$3,876/mo

Years 1130

Fully Amortizing (comparison)

$3,327/mo

Same rate, 30 years

IO Loan Total Interest

$780,359

Fully Amort. Total Interest

$697,544

Extra Interest (IO cost)

$82,814

Payment jump at Year 11: Your payment increases from $2,917 to $3,876 — an increase of $960/month. Plan for this payment shock before choosing an IO loan.

Talk to a Lender

Interest-only loans can make sense for investors and high earners with variable income. Get personalized guidance.

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No equity built during IO period

During the interest-only period, your entire payment goes to interest. Your loan balance doesn't decrease.

Payment shock risk

When the IO period ends, your payment jumps significantly because you're now paying P&I on the full balance in fewer years.

Best use cases

Short-term holds, high-income borrowers with variable income, or buyers who will sell before the IO period ends.