Assumable Mortgage Calculator

Take over a seller's low-rate loan — see the cash you'd bring, your blended rate, and the combined payment.

The assumption

$
$
%
yrs

Funding the gap

90%
Drag left to put more cash down and shrink the second mortgage.
%
yrs
%

What this looks like

Cash to the table
 
Effective blended rate
 
Combined monthly P&I
 

Deal breakdown

More cash down → lower blended rate

The navy curve is your effective blended rate; the amber line is the combined monthly payment. The dot marks your current scenario.

Estimates only. This tool is for planning and is not a payment quote, loan offer, or a commitment to lend. Actual figures depend on the exact payoff balance, rates, terms, and fees.

Not every loan is assumable, and assumptions must be lender-approved. Many VA, FHA, and USDA loans allow a qualified buyer to assume them, but the buyer must be approved and — for VA loans — the seller's entitlement may stay tied up unless the buyer is also VA-eligible. Second-mortgage availability, the maximum CLTV, and pricing vary by lender.

The effective blended rate is a balance-weighted average of the two note rates, not an APR, and does not reflect closing costs, mortgage insurance, or differing loan terms. Confirm all figures and eligibility with your loan originator.