What does one more working year really buy you?
Move the retirement-date slider and see the three jobs an extra year can do: add contributions, add growth, and remove one year of withdrawals.
Work longer—or make the current date work?
Move one slider at a time. The numbers and picture update together.
Illustration uses a constant real return and level monthly contributions. Actual returns are uneven, and taxes and fees are not modeled.
Why this lever can look surprisingly large
An additional working year is not just another year of contributions. The money already saved gets another year to compound, new contributions begin compounding, and the portfolio is asked to support one fewer year of retirement.
That combination is why changing the retirement date can move a projection more than changing a single monthly contribution. The lab keeps those effects visible instead of rolling them into one unexplained number.
What the picture does not decide
The strongest mathematical answer is not automatically the right life answer. Health, caregiving, job stability, time with family, and the value of a healthy year can matter more than the projected balance.
Try zero, one, two, and three extra years. Then ask whether a smaller spending change, part-time bridge, or different claiming strategy could buy the same margin with a better life tradeoff.
Verify before you act
These official resources provide background for the concepts in this illustration: