The first rule of this series is the one we'd write in red ink: always have more money coming in than going out.
It sounds too obvious to need writing down. That is exactly why most people break it. This is level 2 of the Wealth Principles pyramid: how much you save. It sits right above your freedom number, because a target without a surplus is just a wish.
Quick check. You borrow €3,000 on a credit card at 20% a year and pay back €90 a month. How long until it's gone, and how much interest do you pay?
Take a guess before you scroll. The answer is in the next section.
The problem: leverage on things that lose value
Ask a cautious person about leverage and they will tell you it is dangerous. Futures, margin, borrowed money: too risky.
The same person often has a car loan, a credit card balance and a phone on instalments. The point is sharp: consumer debt is leverage on depreciating assets. You borrow to buy something that is worth less every month, and you pay interest on the full amount the whole time.
That is not an investment with risk. It is a guaranteed loss, with leverage.
What it costs: two examples
The car. A €25,000 car loan at 7% over five years costs about €495 a month. In total you pay roughly €29,700, so about €4,700 is interest. If the car loses an illustrative 15% of its value a year, after five years it is worth about €11,100. You paid nearly three times what you own at the end.
The card. Back to the quick check. €3,000 at 20%, paying €90 a month, takes 50 months to clear, more than four years. You pay about €4,400 in total, so roughly €1,400 is interest, almost half the original purchase.
None of that money is working for you. All of it works for the lender.
The principle: save by design, not by willpower
The good news comes from behavioural economics. Saving is not mainly about discipline. It is about defaults.
Automatic enrollment. Brigitte Madrian and Dennis Shea studied a large US company that switched its retirement plan from "sign up if you want" to "you're in unless you opt out". Participation among new employees jumped to 86%, far above the old opt-in rate. Most people also kept the default contribution rate, whatever it was.
Save More Tomorrow. Richard Thaler and Shlomo Benartzi asked employees to commit future pay rises to savings. Average saving rates went from 3.5% to 13.6% in 40 months, with no cut in take-home pay at any point.
The lesson: make the right action the one that happens when you do nothing.
How much your saving rate matters
Same €3,000 net income, four saving rates, 30 years, an assumed 6% a year (illustration, not a forecast):
| Saving rate | Per month | After 30 years at 6% |
|---|---|---|
| 5% | €150 | ≈ €151,000 |
| 10% | €300 | ≈ €301,000 |
| 15% | €450 | ≈ €452,000 |
| 20% | €600 | ≈ €603,000 |
Every five points of saving rate adds about €150,000 in this example. That is more than most people will ever gain by picking better investments.
Budget in reverse
Our method is the opposite of a classic budget. Don't plan what you will spend. Look at what you already spent.
- Export 12 to 24 months of bank and card statements.
- Group them into a few buckets: housing, transport, food, subscriptions, everything else.
- Find the three biggest leaks. They are almost always housing, transport and forgotten subscriptions.
- Cancel or cut one leak this week. Move the amount into an automatic transfer on payday.
Try it now. Open your banking app and search for recurring payments. Most people find at least one subscription they forgot about.
Why "safe" cash isn't safe
Money sitting in a current account feels safe. It is safe from volatility, not from inflation. At 3% inflation, €1,000 in cash buys what €744 buys today after 10 years, and what €307 buys after 40.
Saving is step one. Putting those savings to work is what the next level, asset allocation, is about.
Your checklist
- List every consumer debt: amount, interest rate, monthly payment.
- Pay off the most expensive one first. Don't take on new consumer debt.
- Export 12 months of statements and find your three biggest leaks.
- Set an automatic transfer to savings or investments on payday.
- Decide now that half of your next pay rise goes to savings.
Sources
- Madrian, B. C. & Shea, D. F. (2001). The Power of Suggestion: Inertia in 401(k) Participation and Savings Behavior. Quarterly Journal of Economics, 116(4), 1149–1187. Link
- Thaler, R. H. & Benartzi, S. (2004). Save More Tomorrow: Using Behavioral Economics to Increase Employee Saving. Journal of Political Economy, 112(S1), S164–S187. Link
- U.S. Bureau of Labor Statistics. Consumer Price Index: averages and individual experiences can differ. Link
Educational content, not financial or credit advice. Loan, depreciation and return figures are illustrations, not forecasts or offers. Investing carries the risk of loss.