A put schedule is the part of a bond's terms that sets out when and at what price investors may exercise a put option on a bond. Each entry gives a put date and a put price, normally expressed as a percentage of face value. A bond may have a single put date, a series of annual or periodic dates, or a continuous period during which it can be put.
The schedule is held as reference data by data vendors, custodians and trading systems, and it drives both valuation and operations. Analysts use it to calculate yield to put and to model the option's value, and custodians use it to notify holders ahead of each exercise window and to process elections. It is the investor-side counterpart of the call schedule, and sits alongside the coupon schedule and redemption schedule in instrument reference data.