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Lookback Period

FreddieMac

Updated 10-31-2026

Lookback Period

For ARMs, the Lookback Period is the date on which the Index value used to calculate the new Note Rate is determined. The Lookback Period is stated in the Note and is generally expressed as the number of days preceding the Interest Change Date. The related ULDD Data Point names are Interest And Payment Adjustment Index Lead Days Count and Interest Adjustment Index Lead Days Count.

FreddieMac Glossary

FreddieMac · p. 25

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