Retired Middlebury, Connecticut, school teacher Bill Callahan waited 40 years for Congress to pass a bill to eliminate the reduction in Social Security benefits he receives because he also has a pension.

February’s Supplemental Security Income payment, worth up to $967, will go out to millions of beneficiaries in three days. The next SSI payments are scheduled to be distributed on Friday, Jan. 31. SSI payments are given to people living with debilitating disabilities that affect their income, according to the Social Security Administration.

More than 3.2 million people will see increased Social Security benefits, under a new law. However, individuals who are affected may have to wait more than a year before they see the extra money that’s due to them from the Social Security Fairness Act,

Some Social Security recipients will see a slight change in their payment schedule this month. Typically, recipients of Supplemental Security Income, known as SSI, receive their payments on the first of the month.

Social Security beneficiaries who stood to see a boost in payouts as the result of a law approved earlier this month may have to wait a little longer than expected for higher payments.

The first round of February’s Social Security payments, worth up to $5,108 for the highest-income earners who retire at age 70, will go out to the first group of retirees in 15 days. Here is all you need to know about this month’s Social Security payments,