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Mortgage Interest Rate

Fannie Mae

Updated 10-31-2026

Mortgage Interest Rate

The rate of interest in effect for the periodic installment due. For fixed-rate mortgages or for ARMs that have an initial fixed-rate period, it is the rate in effect during that period. For ARMs after any initial fixed-rate period, it is the sum of the applicable index and the mortgage margin (rounded as appropriate and subject to any per-adjustment or lifetime interest rate ceilings).

Fannie Mae Glossary of Terms

Fannie Mae · p. 32

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