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For 2015 the work penalty limit is $15,720 - so for every $2 over that limit he'll postpone $1 in Social Security income. This limit goes away once he hits his full retirement age - likely 66.
**All above answers are provided as general information only. No warranty is made regarding the fitness or accuracy of the information provided in this answer. You should seek advice from a licensed CPA, attorney or CERTIFIED FINANCIAL PLANNER™ as to your unique financial situation.