Can I afford a sabbatical?

Type in your real numbers. Slide the length and the start date. The calculator shows the Optional Date without the sabbatical, the Optional Date with it, the delay, and what your portfolio does while you’re away.

A sabbatical looks scary in a retirement calculator because a retirement calculator can’t model one. You enter a savings rate, a return, and an end date. There is no field for a year off.

If you fund the year from cash reserves you built for it, the invested portfolio isn’t touched. It keeps growing at market rates for those twelve months. What you lose is one year of contributions: the money you would have added and didn’t.

That’s a smaller cost than it feels like. Twelve months of $2,000 contributions is $24,000 today. In future value at Optional it’s more, because the money would have been compounding. Still a bounded, calculable number, and nothing like the “you’ll never retire” warning your parents will give you.

How much delay you get depends on how far you are from Optional when you take the break. Within a decade of Optional, a 12-month sabbatical usually delays it by 4 to 8 months. Two-plus decades out, 6 to 15 months. Slide the “starts in” chip on the calculator above to see the shift.

The one big assumption
The numbers above assume you cover the year from cash reserves you built before the break, not from your invested portfolio. If you sell investments to fund it, the delay grows sharply, often three to four times larger. The Scenarios Lab makes the same cash-funded assumption. If you’d be pulling from the portfolio, the better move is to build a cash bucket first and model that timeline instead.

The same math runs live in the Scenarios Lab — alongside eight other scenarios you can layer on top (sell the house, drop to part-time, adjust returns, retire earlier). Once you’re signed in, you can save this as a named scenario and compare it side by side against your default plan.

Same engine as the rest of Project Optional. Nothing is hidden.

Each month steps forward. When you’re working, you contribute and the balance grows. During the sabbatical, contributions pause but the balance still grows at the market rate. Zero contributions in, no withdrawal out.

• 7% average real return. Already inflation-adjusted, so your target stays flat in today's dollars. This matches Project Optional’s methodology page and doesn’t double-count inflation.
• 4% safe withdrawal rate, based on the Trinity Study. Adjustable inside the app; fixed at 4% on this page.
• You fund the sabbatical from cash reserves, not from your invested portfolio. The Scenarios Lab uses the same assumption.
• No income during the sabbatical. Freelance work, seasonal gigs, or any side income shortens the delay and isn’t modeled here (it is inside the app).
• No taxes on withdrawals. See the methodology page for why we leave taxes out of the projection itself. The Real-life limits section further down covers how taxes affect what you can actually spend.
• No Social Security. Every projection assumes zero government income once you stop working. In real life, factoring it in lowers the number you need.

Is it better to take a sabbatical earlier or later? Later is cheaper on the calculator: the missed contributions have less time to compound into a bigger gap. Later is often harder in real life. Kids, mortgages, and career gravity get heavier. The calculator shows the money side; you weigh the rest.

What if I work part-time during it? Then it’s not a sabbatical, it’s a part-time year, and the delay is much smaller.

Do I need a cash cushion on top of this? Yes. The calculator assumes you have one. In real numbers, you’d fund the sabbatical from a cash bucket built before the break and leave the invested portfolio alone. That’s why this reads as a 7-month delay and not a 20-month one.