Once I Hit My Coast FIRE Number, Should I Stop Contributing to Retirement Accounts Altogether?

Short answer: you are allowed to, but it is not a switch you should flip without checking the assumptions. Coast FIRE says contributions are no longer required; it does not say they are worthless. The decision comes down to your tolerance for return assumptions and what the money would otherwise do.

What does hitting the Coast FIRE number actually mean?
It means the money you already have, left alone, is projected to grow into your full FIRE number by your target retirement age. From that point on, contributions are no longer required for the end goal — which is different from saying they are pointless.

Can I stop contributing altogether?
You can, and that is the standard reading of Coast FIRE. The math only holds if the portfolio actually compounds at your assumed real return and you do not withdraw from it before retirement. Both are assumptions, not guarantees.

What changes if I keep contributing anyway?
Three things move in your favor: you reach full FIRE earlier, you build a bigger buffer against poor returns, and you shrink the gap between Coast and full numbers faster. The cost is the money you are not spending today.

What is the risk of stopping contributions?
Sequence risk and assumption drift. If returns underperform for a few years early on, the portfolio can fall behind the projection and never catch up by the target date. Contributions are the cheapest repair for that.

Does stopping contributions change my Coast number?
No. The Coast number is defined by your spending, withdrawal rate, and time horizon. Stopping contributions does not move the number; it just decides whether you keep building past it.

What should I do with the money I would have contributed?
That is the real question behind Coast FIRE. Options include taxable investments, paying down debt, saving for a house, or spending. The honest answer depends on your rate vs the loan, not on a rule.

How do I check whether my plan still works after stopping?
Re-run the calculation with your current balance, your assumed return, and the same target date. If the projected value still clears your full FIRE number with headroom, stopping is defensible. The Coast FIRE calculator does exactly that check.

Is there a middle ground?
Yes, and most people land there: cut contributions to a token level instead of zero. It keeps the habit, hedges the assumptions, and barely touches your spending. Coast FIRE is a permission to ease off, not a binary switch.