Savings Rate

5 min read

Savings Rate

Your savings rate --- the percentage of income you keep --- is the single most powerful lever in personal finance. It is more important than your income, your investment returns, or your financial sophistication.

What is it?

The savings rate is the fraction of your income that you do not spend. If you earn CHF 8,000/month and spend CHF 6,000, your savings rate is 25%. That CHF 2,000 is the delta between revenue-and-expense in your personal income statement --- and it is the only money that builds your equity.

The savings rate is powerful because it has a double effect: every franc saved is simultaneously a franc you do not need (lowering your independence target) and a franc that can be invested (building toward that target). Increasing your savings rate attacks the problem from both sides.

The relationship between savings rate and time-to-independence is exponential, not linear:

Savings rateApproximate years to independence*
10%~40 years
20%~30 years
30%~22 years
50%~15 years
70%~8 years

*Assuming 5% real return, starting from zero, constant expenses.1

Going from 10% to 20% saves a decade. Going from 20% to 50% saves fifteen years. The numbers are counterintuitive because compounding and the double effect amplify small changes in rate into large changes in time.

In plain terms

Your income determines how fast water flows into the bathtub. Your spending determines how fast it drains. Your savings rate is the net --- how fast the water level rises. A larger pipe (more income) does not help if the drain is equally large.

How does it work?

1. Income vs savings rate

Doubling your income while doubling your spending gets you nowhere. Your savings rate stays the same, your equity stays the same, and your independence timeline does not move. This is lifestyle inflation --- the tendency for spending to expand to match income. It is the reason many high earners have low or negative net worth.

The savings rate is the correction. It forces you to ask: of every franc earned, what fraction is building my future? Income matters, but only to the extent that the gap between income and spending widens.

2. The three levers

You can increase your savings rate by:

  1. Earning more while holding spending constant (harder, but no lifestyle sacrifice)
  2. Spending less while holding income constant (immediate effect, requires structural changes not daily discipline)
  3. Both (the most powerful, but requires intentionality on both sides)

For someone with present-bias and ADHD, lever 2 is best approached architecturally: automate the savings first (pay yourself first), then spend what remains. This is the core principle of cash-flow-architecture. You do not track expenses. You set the savings rate, automate it, and spend the remainder guilt-free.

3. What rate to target

There is no universal answer. But there are reference points:

  • 10-15%: the minimum recommended by most financial planners. Builds retirement wealth over a full career.
  • 20-30%: accelerated timeline. Fifteen to twenty years to substantial independence.
  • 50%+: the FIRE (Financial Independence, Retire Early) range. Requires either high income, low expenses, or both. Achievable but demands structural life design.

The right rate for you depends on your income, your fixed costs (rent in Lausanne is not optional), and how urgently you need the entrepreneurial-runway to make the leap to independence. Start where you can. Increase as income grows. The trajectory matters more than the starting point.

Why do we use it?

Key reasons

1. Controllability. You cannot control market returns. You cannot always control your income. You can always control the gap between income and spending. 2. Double effect. Each franc saved reduces the target AND increases the capital. No other variable has this dual leverage. 3. Simplicity. One number. Track it quarterly. The trend tells you everything about your financial trajectory.

Check your understanding

Where this concept fits

Where this concept fits 

graph TD
    RE[Revenue and Expense] --> SR[Savings Rate]
    TVM[Time Value of Money] --> SR
    SR --> CFA[Cash Flow Architecture]
    SR --> FI[Financial Independence]
    SR --> CI[Compound Interest]
    style SR fill:#4a9ede,color:#fff

Sources

Footnotes

  1. The table derives from the framework popularised by Mr. Money Mustache (2012) and formalised in Bernicke, W. (2005). “Reality Retirement Planning.” Journal of Financial Planning. See also Collins, J. L. (2016). The Simple Path to Wealth. ↩

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