India, Feb. 14 -- Some Americans may receive an additional Social Security lump-sum retroactive payment this year, after several U.S. senators urged the Social Security Administration (SSA) to revise its implementation of the Social Security Fairness Act.

The Social Security Fairness Act eliminated the Government Pension Offset (GPO) and the Windfall Elimination Provision (WEP) last year. That meant many seniors who received pensions earned higher Social Security payments, but some were left out of getting full retroactive lump sum payments.

If the SSA accedes to the request, affected beneficiaries could receive back-dated payments covering up to 12 months of missed benefits under the law, expanding on earlier six-month payouts official...