An offset mortgage is a type of home loan that involves blending a traditional mortgage with one or more deposit accounts held by the same financial institution. The savings balance maintained in the deposit account may then be used to offset the mortgage balance, lowering interest payments due.

Offset mortgages are standard in many nations, such as the U.K., but are currently not eligible for use in the U.S. due to tax laws. The closest alternative to an offset mortgage in the U.S. would be an all-in-one mortgage.