After spending decades in the workforce, you might look forward to the day you retire. But if you decide, for one reason or another, that you’d like to redefine “retirement” to include part-time work or consulting, you could enjoy exercising your skills and meeting new people. But you can also receive some key financial benefits.

Specifically, bringing in some paychecks in your retirement can help you in these areas:

• You could contribute more to your IRA. During your working years, you m...