Social Security beneficiaries have some changes coming in December and January, due to quirks of the calendar and a payment hike.

The first round of December’s Social Security payments, worth up to $4,873 for the highest-income earners who retire at age 70, will go out to the first group of retirees in eight days. Here is everything you need to know about December’s Social Security payments, which go out in three rounds.

If you’re wondering when to expect your payments this December, read on for the complete Social Security calendar.