Millions of Social Security recipients won’t receive a benefit check this month due to a quirk of the calendar. The issue impacts people who receive Social Security’s Supplemental Security Income, or SSI, a program for disabled adults as well as low-income seniors.

The quirk isn’t a new development, as the Social Security Administration sets its annual payment schedule well in advance of the year. (See here for the 2024 schedule and here for the 2025 payment dates.) But the lack of a payment this month could still come as a rude surprise to some beneficiaries who weren’t prepared for or aware of the shift in payment dates.

Typically, SSI recipients receive their checks on the first of the month. But because September 1 fell on a Sunday this year, SSI payments for the month were sent on Friday, August 30. That means the next SSI checks will be deposited on Tuesday, October 1, with no deposits occurring in September.

About 7.5 million people receive SSI benefits, with the maximum monthly benefit set at $943 per individual, according to Social Security data. By comparison, the average payment for Social Security retirement benefits is $1,907 per month.