Originally Posted by
camachinist
According to the T&C's (
https://www.marriott.com/rewards/ter...rms.mi#upgrade), you can use points to upgrade on a paid stay.
You can only use upgrade rewards when you are redeeming points for a hotel stay. For most cases**, you cannot use upgrade rewards to upgrade a paid room.
**Based on hotel availability and point balance, members at the Silver level may choose to use points at check-in to upgrade their paid room. Point upgrade rewards are 5,000 points each and offered at hotels in the US (except Hawaii) and Canada only.*** This type of upgrade award cannot be reserved in advance.