He Helped Build It. At 67, He Came Back to Demolish It. Social Security Kept Paying. His Union Pension Stopped.

Once a worker reaches full retirement age of 67, Social Security cannot withhold benefits regardless of how much they earn returning to work.

Union pension funds can permanently suspend monthly checks when retirees return to the same industry, trade, and geographic area for 40-plus hours a month.

Suspended pension checks are rarely paid back, so a $8,000 job that pauses a $2,400 monthly pension must be evaluated on net gain, not headline pay.

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A heavy-equipment operator sits in an excavator cab downtown. Around 2005, he helped put up the five-story office building in front of him. Two decades later, the city wants stadium parking there, and a contractor has called him back for one last job: tearing down what he helped build. At 67, the pay is good, the controls still feel familiar, and Social Security keeps arriving without interruption. Then his union pension fund learns where he is working.

One retirement system looks at his age and keeps paying. The other looks at the machine he climbed back into and stops.

Social Security's Earnings Test Has Ended

Social Security can withhold benefits when someone claims early and continues working above an annual limit. That earnings test ends in the month the worker reaches full retirement age. For people born in 1960 or later, that age is 67. A worker born in 1959 reached it slightly earlier, at 66 and 10 months. Once he has crossed that line, his wages no longer reduce his retirement benefit, regardless of how much the demolition contract pays. Social Security may even recalculate the benefit if the new earnings replace a weaker year in his 35-year record.

The paycheck is not invisible, however. Payroll taxes still apply at 67, and the additional income may make more of his Social Security taxable. What disappears is the earnings-test withholding—not every financial consequence of returning to work.

A multiemployer union pension follows a different clock. Its plan documents may allow payments to be suspended when a retiree returns to what the fund considers disqualifying employment. After the plan's normal retirement age, federal rules generally allow that suspension when the retiree works at least 40 hours during the month in:

The same trade or craft in which he previously worked.

The geographic area covered by the fund.