Stub period
Also called Partial period · Activation stub
TL;DRThe shortened first (or last) window when a schedule starts or ends off-cycle.
A schedule activated on the 20th with a billing day of the 1st produces a first invoice for the 20th to the end of the month, then falls into normal cycles. That first window is the stub.
Stubs are priced by calendar-unit proration for fixed and seat products. In shipment billing the leftover days after the last full window up to the contract's end date are a stub too.
Where it happens in Sonic
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See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.