The real tradeoff is not just a paycheck. Working longer can add savings, shorten the years your portfolio must support you, and change the timing of benefits. Retiring sooner may give you more time, but it asks your plan to carry more uncertainty.
Use one consistent set of assumptions for each scenario. That makes the difference easier to understand and gives you a clearer starting point for an important conversation.
Build a private plan, compare two dates side by side, and review the assumptions behind the result.