Outils · Prolongateur de marge

Trois leviers pour allonger votre marge

Votre épargne dure exactement aussi longtemps que votre rythme de dépense le permet. Actionnez ces trois leviers — dépenser moins, gagner un peu, vivre moins cher — et regardez les mois s'accumuler.

Last updated: June 2026

Financial runway — how many months your savings will last — is a function of exactly one ratio: your liquid savings divided by your monthly burn rate. That means there are only three ways to extend it: reduce spending, add income, or lower your cost of living by relocating (geoarbitrage). This tool lets you combine all three to see the compounding effect.

How the three levers interact

Runway (months) = savings ÷ (monthly expenses − monthly income). Because income is subtracted from expenses before dividing, even modest part-time or freelance income has an outsized effect on runway compared to the same dollar amount saved — reducing net burn from $3,000/month to $2,000/month (via $1,000/month of side income) extends a $30,000 fund from 10 months to 15 months, a 50% increase from a 33% reduction in net burn.

Why it matters

Most people instinctively reach for only one lever (usually cutting spending) when facing a shrinking runway, but small moves across all three levers often add up to more extended runway with less lifestyle sacrifice than an aggressive cut to just one. It's also the same underlying math used in the layoff runway and sabbatical calculators — this tool exists specifically to let you test combinations.

Common pitfalls

Side income and geoarbitrage savings are rarely available immediately — a new location or side gig takes time to set up, so runway calculations should account for a ramp-up period rather than assuming the full effect from day one. It's also easy to underestimate how "sticky" certain expenses are (a lease, a car payment, a mortgage) versus genuinely discretionary spending that can be cut quickly.

Un déménagement vers une ville moins chère peut réduire le coût de la vie de 20 à 60 %.

Marge

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Préparation au départ complète → Comparer les villes
Un modèle approximatif — un déménagement a des coûts ponctuels et votre dépense réelle varie d'un mois à l'autre. Éducation, pas un conseil financier.

Frequently asked questions

How can I make my savings last longer?
Three levers: cut spending, add side income, or relocate cheaper. Each lowers your monthly burn, and since runway = savings ÷ burn, even small cuts add months. Stacking all three can double or triple your runway.
What's the fastest way to extend my runway?
Lowering your burn beats almost everything — it stretches existing savings and shrinks the total you need. Relocating to a lower-cost city is often the single biggest lever, cutting costs 20–60%.
How is financial runway calculated?
Runway = liquid savings ÷ net monthly burn (expenses minus income). $30,000 against a $3,000 burn is 10 months; cut the burn to $2,000 and the same savings last 15.
Can side income make my runway unlimited?
Yes — if your side or part-time income fully covers your burn, savings stop depleting and the runway becomes effectively permanent. That's the Barista FIRE / side-hustle bridge sweet spot.