Resources · Sabbatical
Can I afford a sabbatical?
Short answerYes, if your cash covers the break. A cash-funded 12-month sabbatical usually pushes your Optional Date by months, not years. How many months depends on your balance, your contributions, when you take the break, and what return you assume.
Two questions on this page, one calculator. First, whether your cash actually covers the year. Second, how much the paused contributions delay Optional. You'll see the delay across 3%, 5%, and 7% real returns, so the answer is a range instead of one date pretending to be certain.
Calculator
Run your numbers, both sides
Enter your portfolio (balance, contribution, spending target) and your break (sabbatical fund, monthly costs, health insurance, break income, re-entry buffer). You get the required cash, any funding gap, the Optional-Date delay at your chosen return, and the range across 3%, 5%, and 7% real returns.
What this answersTwo questions, kept separate: (1) can the break itself be covered from cash without selling investments, and (2) how much does the pause in contributions delay Optional? A healthy answer to both is what "afford" means here — the tool doesn't try to price health insurance for you or predict a job market.
13%
Funded today
Years to Optional (5% real)
JUL 2051
vs baseline APR 2050
Delay: +15 months
Across the return range
13–18 months
Cash runway check
- Required cash
- $58K
- Cash on hand
- $35K
- Funding gap
- -$23K
- Investment draw
- -$23K
Delay by return assumption
- 3% real
- +18 mo
- 5% real
- +15 mo
- 7% real
- +13 mo
Sabbatical length
Starts in
Break budget (the cash-side check)
Expected real return
Required cash
$58K
Funding gap
-$23K
Optional-Date delay
+15 months
Cash on hand doesn't fully cover the break. On the expected 5% scenario, the $23K shortfall pulled from investments contributes to the 15-month delay.
Model The cash-side numbers stay in nominal dollars (what you actually pay). The portfolio-side simulation uses your selected real return so both targets stay flat in today's dollars. Any funding gap becomes a one-time investment draw at the start of the break; the model doesn't include tax on that draw, market losses during the break, or a drawn-out job search.
Numbers above use your selected real return. The full app also models Social Security, drawdown taxes, and multi-lever combinations.
What the year off actually costs
If you fund the year from cash, your portfolio isn't touched. It grows at market rates for those twelve months. What you lose is a year of contributions. For a profile 15 to 25 years from Optional, that's a delay of roughly 5 to 12 months across 3-7% real returns. Closer to Optional it's smaller. Earlier in a career, larger. A funding gap pulled from investments makes it materially bigger.
The one big assumption
You cover the break from cash. Any shortfall becomes a one-time investment draw at the start, which typically doubles or triples the delay. The calculator shows this directly: any gap gets pulled forward into the number you see.
Worked example · illustrative
What a 12-month break can look like
Case study — Maya, 36 — illustrative case study, product designer
Product designer in Seattle. $220,000 in her 401(k) and taxable brokerage. Saves $2,000/month. Spends about $70,000 a year. She wants twelve months off in two years to travel and write, and she has $35,000 set aside for it.
Balance
$220,000
Monthly save
$2,000
Annual spend
$70,000
Sabbatical fund
$35,000
Her required cash: $3,000/mo living + $600/mo health insurance + $4,000 one-time costs + a 3-month re-entry buffer, which comes to about $58,000. Her $35,000 fund leaves a $23,000 gap.
If she takes the break with just $35K, the $23K shortfall gets pulled from investments at the start. At 5% real, Optional slides about 15 months (13 at 7%, 18 at 3%). Not years, but a real hit.
If she saves the gap first ($58K fund, no investment draw), only the missed year of contributions counts. At 5% real, the delay drops to about 7 months. Across 3-7%, roughly 6 to 9.
At 43 instead of 36, the same fully-funded break moves Optional by about 6 months. Less runway ahead means less time for the missed contributions to compound into a bigger gap.
Maya is a composite illustration, not a real customer. Enter your own numbers in the calculator above to see how your case differs.
Inside the app
This decision, inside Project Optional
The same math runs in the Scenarios Lab alongside eight other levers (sell the house, drop to part-time, boost, adjust returns). Sign in, save this as a named scenario, and compare it against your default plan.
The math
Assumptions and formulas
Same engine as the rest of the app.
Optional Number = Annual Spending ÷ 4% = Annual Spending × 25
The cash-side arithmetic (in today's dollars): required cash = length × (monthly break spending + health insurance) + one-time costs + (re-entry months × monthly break costs) − (income during break × length). Funding gap = max(0, required − fund). Any gap becomes a one-time investment draw at the start of the break.
The portfolio simulation steps month by month at your selected real return:
ending balance = starting balance × (1 + monthly return)
+ (working ? monthly contribution : 0)
monthly return = (1 + real return)^(1÷12) − 1
e.g. 5% real ⇒ ≈0.407%/mo, 7% real ⇒ ≈0.565%/mo
- Real (inflation-adjusted) return. Default 5%, with 3% and 7% shown alongside so you see the sensitivity.
- 4% safe withdrawal rate, from the Trinity Study. Fixed on this page; adjustable in the app.
- Cash-funded break. Any shortfall pulls from investments at the start, which materially increases the delay.
- Nominal cash-side numbers (today's dollars). You enter health insurance and travel costs directly; the tool doesn't price COBRA or ACA plans.
- Optional income during the break. Freelance work, seasonal gigs, or partial paid leave cut both the required cash and the delay.
- Real portfolio contributions. The nominal amount tracks inflation to hold purchasing power; a frozen nominal contribution would compound to less.
FAQ
What people ask about this
Is it better to take a sabbatical earlier or later? Later is cheaper on the calculator. The missed contributions have less runway to compound. Later is often harder in life, though: kids, mortgages, career gravity.
What if I work part-time during it? Then it isn't a sabbatical, it's a part-time year, and the delay is much smaller. Use the "Income during break" field above.
What if the break isn't voluntary? Then it's a layoff question. Same portfolio math, but with harder spending cuts and no travel costs on top. Usually less damaging than a chosen sabbatical.
Do I need a cash cushion on top of this? Yes. The re-entry buffer covers a slow job search but isn't a general emergency fund. Keep your real emergency fund outside both the sabbatical fund and the portfolio.
Why show three returns instead of one? A smooth 7% real forever paired with an exact month and year is false precision. Showing 3% / 5% / 7% side by side reports the actual shape of the answer, which is a range.
Keep reading
How damaging would a one-year layoff be? →
Same portfolio math, forced instead of chosen. Usually less damaging, because spending drops with the paycheck.
Can I work part-time after Optional? →
Extends the same trick from a single break to ongoing partial income.
If I save an extra $500 a month, when can I retire? →
The opposite lever, running the same math forward. Good for closing the sabbatical funding gap in advance.
Membership
Save this sabbatical and compare it side by side
Enter your actual numbers, save this as a named scenario, and stack it against Part-Time, Sell-the-House, Boost, and Layoff. Every change updates every scenario, live.