Income gets all the attention. But income doesn't build wealth — savings do. Your savings rate (the percentage of after-tax income you don't spend) is the single most predictive metric for long-term financial outcomes.
Average savings rates by country (2025)
| Country | Average savings rate | Source |
|---|---|---|
| Switzerland | ~19% | OECD 2025 |
| France | ~15% | INSEE 2025 |
| Germany | ~11% | OECD 2025 |
| UK | ~7% | ONS 2025 |
| USA | ~4.5% | FRED 2025 |
The French save relatively well compared to other developed nations. But even 15% is not enough to build significant wealth quickly. Let's see what different rates actually produce.
What your savings rate produces over time
Assuming a €3,000/month net income invested at 6% real return (after inflation):
| Savings rate | Monthly saving | After 10 years | After 20 years | After 30 years |
|---|---|---|---|---|
| 5% | €150 | €24,600 | €69,200 | €150,800 |
| 15% | €450 | €73,700 | €207,600 | €452,300 |
| 30% | €900 | €147,400 | €415,200 | €904,700 |
| 50% | €1,500 | €245,600 | €692,000 | €1,507,800 |
The jump from 15% to 30% doesn't double your outcome — it does double it, because the math is linear in the savings rate. But the jump from 30% to 50% at 30 years is the difference between €904,700 and €1.5 million. That's €600,000 from an extra €600/month.
How to increase your savings rate
The 50/30/20 rule: 50% needs, 30% wants, 20% savings. It's a good starting point, but 20% won't make you wealthy quickly. Aim higher if you can.
Pay yourself first: Automate a transfer to your investment account the day you get paid. What you never see, you don't spend.
The big three: Housing, transport, and food consume 60-70% of most budgets. Optimizing these three categories has more impact than cutting all your subscriptions.
Gross vs. net savings rate
Your gross savings rate includes employer retirement contributions and tax-advantaged accounts. Your net savings rate is what you voluntarily save from take-home pay. Both matter. In France, employer retirement contributions (via PER) can add 3-5% to your effective savings rate without any effort on your part.
Use the savings rate calculator to find your exact rate and see what it produces over time. The tool shows you both nominal and inflation-adjusted projections, so you know exactly where you stand.