If you are entitled to a monthly pension based on noncovered employment and are also eligible for Social Security benefits, the Social Security Administration (SSA) has rules in place for recomputing your primary insurance amount (PIA) to take your pension into account.
These rules are outlined in § 404.288 of the SSA regulations.
https://www.ssa.gov/OP_Home/cfr20/404/404-0288.htm
If you first become eligible for old-age or disability insurance benefits after 1985 and later become entitled to a monthly pension based on noncovered employment, the SSA may recompute your PIA under the rules in § 404.213. When recomputing, they will use the amount of the pension to which you are entitled or deemed entitled in the first month that you are concurrently eligible for both the pension and old-age or disability insurance benefits. The SSA will disregard the rule in § 404.284(e) that the recomputation must increase your PIA by at least $1.
If the SSA has already computed or recomputed your PIA to take into account your monthly pension, they may later recompute for one of the reasons explained in § 404.281. They will recompute your PIA under the rules in §§ 404.213 and 404.284. Any increase resulting from the recomputation under the rules of § 404.284 will be added to the most recent PIA which the SSA had computed to take into account your monthly pension.
If you pass away and one or more survivors are entitled to benefits after your death, the SSA will recompute the PIA as though it had never been affected by your entitlement to a monthly pension based on noncovered employment.
It’s important to note that recomputing your PIA to take into account your monthly pension may result in a lower benefit amount, depending on the amount of your pension. It’s a good idea to contact the SSA to discuss your options and determine the best course of action for your situation.
In conclusion, if you are entitled to a monthly pension based on noncovered employment and are also eligible for Social Security benefits, the SSA has rules in place for recomputing your PIA to take your pension into account. The process depends on when you first became eligible for benefits and whether your PIA has already been recomputed to include your pension. It’s important to discuss your options with the SSA to ensure that you receive the benefits you are entitled to.