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Each year SSA reviews the records for all working Social Security recipients. If your earnings for the prior year are higher than one of the years they used to compute your retirement benefit, they will recalculate your benefit amount. SSA pays the increase retroactive to January the year after you earned the money.
Unfortunately if your work does not increase your benefits that does not release you from the law requiring payments to SS and Medicare based on the self employment.
Because the law requires that covered earnings are subject to SS and Medicare tax, even if you do not have an increase you must continue to contribute.