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Time off costs your expenses twice — once out of savings, once out of paychecks.
Six months away at $3,800 a month is not a $22,800 decision — it is a $57,000 one once you count the $31,200 of take-home pay that never arrives and a buffer for what goes wrong. This calculator totals living expenses, forgone income, and a safety margin so the number you save toward is the number that actually survives the trip.
Planners use it to set the savings target: 6 months off at $3,800/month is a $57,420 decision once forgone pay and the buffer are counted honestly.
The honest formula is monthly expenses × months, plus monthly take-home × months, plus 15–20% buffer. For $3,800 expenses and $5,200 take-home over 6 months: $22,800 spending + $31,200 forgone pay + $3,420 buffer = $57,420 of runway. The forgone-pay half is the part people skip — it is not cash you need in the bank on day one, but it is real wealth you will not have afterward, and it is what makes re-entry stressful if the savings run dry. If you only want the cash-needed number, use expenses plus buffer ($26,220 here); if you want the true economic cost, use the full figure. Travel-heavy sabbaticals should add flights, insurance, and gear to the monthly expense input as one-off padding.
In the US, three main routes: COBRA continues your employer plan for up to 18 months but you pay the full premium plus 2% — typically $600–$800/month for single coverage, which is 2–4× what came out of your paycheck. ACA marketplace plans are usually cheaper if your sabbatical-year income is low, because subsidies scale with income — a mid-year sabbatical can qualify you for significant premium tax credits. A spouse or partner’s employer plan is the cheapest option if available, and leaving a job is a qualifying life event that opens their enrollment. Budget the full premium into your monthly expense input — health insurance is the single most-forgotten sabbatical cost and it can add $4,000–$6,000 to a 6-month break.
The data says less than people fear, but the financing matters. A planned sabbatical with a return date — especially an employer-approved leave — reads neutrally on a resume; a savings-funded gap with a clear story reads fine in interviews. What hurts is an unplanned gap with no narrative. The financial risk is the sharper edge: returning to the same salary assumes the job is waiting or the search is short, so if your field has long hiring cycles, extend the buffer from 15% to 25% or add 1–2 months of expenses. The compounding cost is real but small — 6 months of missed retirement contributions at a $100,000 salary is roughly $5,000–$7,500 including match, which decades of growth multiplies, but one break in a 40-year career is a rounding error next to burnout-driven early exits.