Social Security monthly benefits are paid one month in arrears. From their letter: "Social Security benefits for a given month are paid the following month. (For example, Social Security benefits for March are paid in April.)"
Example for this question: I started a benefit of $100 in November, which is paid in December. In this example will my 1099-SSA state I received $100 for the year (the November benefit amount paid in December) or $200 (the benefit amount for November plus the benefit amount for December? (Even though I only received a payment of $100 for the year, that is, the November benefit paid in December.)
