example, if youâre eligible for a $500 spouses, widows, or widowers benefit from Social. Security, youâll get $100 a month from Social. Security ($500 â $400 = $100). If two-thirds of. your government pension is more than your. Social Security benefit, your benefit could be. reduced to zero. If you take your government pension annuity in. a lump sum, Social Security will calculate the. reduction as if you chose to get monthly benefit. payments from your government work.