The Cost of a Mini-Retirement: How a Year Off Changes Your FI Date

A year off has two prices: the cash needed to live through it, and the delay to financial independence (FI). Those numbers answer different questions. Having enough for the break does not tell you how much longer you will work afterward.

For the fictional household below, twelve months off delays FI by 17.9 months. That assumes steady investment growth and a return to the same contributions. A larger portfolio shrinks the delay because its remaining investments keep growing while you are away. With enough invested, the delay can even be shorter than the break.

The household and the calculation

Illustrative assumptions, all in today's dollars:

• $400,000 invested at the start
• $70,000 of annual spending after returning to work and in retirement
• A chosen FI target of $1,750,000, or 25 times that spending
• $45,000 invested per year while working
• 5% annual real return, after inflation
• $50,000 of annual spending during the break, withdrawn from the portfolio

The 25-times target is an assumption, not a finding that this household can safely retire. A withdrawal rate answers a different question from an expected return.

Apply growth monthly, then add contributions or subtract break spending at month-end. Contributions resume after twelve months. Ignore taxes and fees separately; any withdrawal taxes and replacement benefits must fit within the spending assumption for the comparison to hold.

The monthly return is approximately 0.4074%: the twelfth root of 1.05, minus 1. In the first month, working leaves about $405,380: $400,000 plus $1,630 growth and $3,750 contributed. On break, the same growth followed by a $4,167 withdrawal leaves about $397,463.

Repeat that calculation until the balance reaches $1,750,000. With no break, it takes 14.4 years. With the break, it takes 15.9 years, measured from the same starting date.

Contributions stop, withdrawals reduce the balance, and both changes leave less money earning future returns. Meanwhile, the investments that remain keep growing. The balance between those forces determines the delay.

The same break costs less time later in the journey

Same household, same twelve months away, different starting portfolios:

Portfolio when the break starts	Delay	Delay per month off
$150,000	22.2 months	1.85x
$400,000	17.9 months	1.49x
$700,000	14.5 months	1.21x
$1,000,000	12.1 months	1.01x
$1,400,000	10.0 months	0.83x

At $1.4 million, the portfolio grows during the break despite the withdrawals. On returning to work, the household has less than it would have had by staying employed, but more than it started with. It has made some progress toward FI during its year away, so the eventual delay is less than a year.

At $400,000, extending the break from three to twenty-four months changes the multiplier only from 1.48x to 1.51x. That makes 1.5 a useful estimate within these assumptions, not a universal price for time off. A sufficiently long or expensive break can exhaust the portfolio.

A rough crossover, not a safe-spending rule

A quick estimate of the portfolio that could maintain its value during a break is:

$$\text{Portfolio} \approx \frac{\text{Annual break spending}}{\text{Assumed real return}}$$

Here, $50,000 divided by 0.05 gives about $1 million. If growth exactly replaces withdrawals, the break ends with the starting balance intact. Resuming the same contributions then puts FI one break-length later than the original plan.

Withdrawal timing matters. With this model's monthly growth and withdrawals, the precise balance-preserving point is about $1.023 million: monthly spending divided by the monthly return. That explains why $1 million in the table still produces slightly more than twelve months of delay.

This crossover is a property of steady-return arithmetic. It is not a promise that a portfolio will earn its assumed return during your break. At a 0% real return, there is no positive-return crossover: withdrawals reduce capital at every portfolio size. For this household, the zero-return version of the year off delays FI by about 25.3 months.

Break spending changes both prices

At the same $400,000 starting portfolio and 5% real return:

Annual spending during the break	Delay per month off
$35,000	1.25x
$50,000	1.49x
$70,000	1.82x
$85,000	2.07x

Spending $85,000 rather than $35,000 means a larger cash requirement and roughly twice the timeline cost per month away. Housing you retain, travel, health coverage and returning-home costs belong in the estimate. Use recorded spending as a starting point, then adjust for what changes during the break.

Fund the return to work, too

A twelve-month break followed by a three-month job search means fifteen months without contributions. At unchanged break spending, this household's delay becomes 22.4 months, rather than 17.9. A lower-paying return could add more; a guaranteed return to the same role makes this assumption easier to defend.

Check which funds you can actually access. A retirement-account balance is not automatically available for groceries without taxes, penalties or restrictions. Money needed for a short-term goal should not depend on risky investments holding their value. Separating accessible cash for the break and a job-search buffer reduces the need to sell shares after a fall. Holding that cash changes the return mix, so recalculate rather than assuming the all-invested table still applies.

Get health coverage quotes before choosing a date. Marketplace savings depend on household income for the coverage year, not employment status, so wages earned before quitting still matter. Include premiums and expected out-of-pocket costs once in the break budget.

Start with what you actually spend, price the full period until earnings resume, and identify accessible funding. Then compare the timeline delay with the time you want now.

For the related question of whether investments could reach a future target without more contributions, the Coast FIRE calculator can help. It assumes no portfolio withdrawals; it does not price this break. A year away needs its own spending and re-entry assumptions before its retirement-date cost means anything.

This is general information, not financial, tax or investment advice. The household is fictional. Constant-return projections illustrate arithmetic, not future investment performance or retirement readiness.