Pay day arrives and the same question comes with it: where should this money go? Most people answer by default. Rent and bills leave first, spending takes what it takes, and whatever is left over, if anything, becomes "savings". The trouble is that this order puts your future last, so it only gets the crumbs.
This guide gives you a simple structure instead: four jobs for every euro, a starting split you can adjust, and a calculator that shows what each choice does to your savings over time. It is the third step of our Money in your 20s reading path: first you set goals, then you build an emergency fund, then you decide how each month's pay gets divided.
Start with net pay
Everything here uses net income: what actually lands in your account after tax and social contributions. Gross salary is a number on a contract; you can only spend, save or invest what you receive. If your income varies, use a conservative average of the last few months.
The 50/30/20 rule: a starting point
The best-known split is the 50/30/20 rule. It comes from the 2005 book All Your Worth: The Ultimate Lifetime Money Plan by Elizabeth Warren and her daughter Amelia Warren Tyagi, and divides after-tax income into three parts:
- Needs (50%) are costs you cannot easily avoid: rent, utilities, basic groceries, transport to work, insurance and the minimum payments on loans.
- Wants (30%) are things you choose: eating out, subscriptions, trips, new gadgets, hobbies.
- Savings (20%) covers the emergency fund, retirement and investing, and paying debt down faster than required.
It is a rule of thumb, not a law. The right percentages depend on your local cost of living, your income and your goals, and in an expensive city 50% for needs may simply be unrealistic. What makes the rule useful is the shape: a fixed share for the future, decided before spending starts.
Four jobs for every euro
The planner below splits savings into two, because they are different decisions:
- Needs, including the minimum loan payments.
- Wants, the flexible part of your life.
- Extra debt repayment, paying a loan down faster than the bank requires. Whether this beats investing is a real question, covered in Should You Prepay Your Loan?.
- Saving and investing, the emergency fund first, then long-term investments such as ETFs and pension contributions.
Try it: pick a starting plan, drag the sliders (the four slices always add up to 100%), and watch what the saved slice becomes.
What a small slice becomes
The planner's growth chart is the compounding effect from our compounding guide applied to your own monthly amount. At the default numbers (€1,000 of net pay, 20% saved and invested, a 6% yearly return), setting aside €200 a month grows to roughly €92,000 after 20 years. You put in €48,000 and growth adds about €44,000.
Two cautions belong next to that number. The 6% is an assumption, not a promise: markets fall as well as rise, and our guide on realistic stock returns explains what history does and does not show. And the point is the shape, not the figure. Time and consistency do most of the work, and the first years feel unrewarding because the early contributions have not yet had time to compound.
Pay yourself first
The most reliable improvement is not a better percentage; it is order. Set up a standing order for the day your pay arrives, so the saving happens before the spending, not after:
If you wait to see what is left over, there is rarely anything. If the transfer has already happened, you spend the remainder and the budget works without willpower.
Build the safety net first
Before investing for decades, build an emergency fund of about three months of needs (not of your full income). The planner shows how long that takes at your current pace: at €500 of monthly needs and €200 saved a month, the €1,500 target takes eight months. Until it exists, an unexpected bill becomes a loan or forces you to sell investments at a bad moment. Our emergency fund guide covers where to keep it.
Adapting the split
Plans are starting points. Three common situations:
- Tight budget. If needs take 65% of your pay, a 65/15/20 split keeps saving intact by trimming wants. Then work on the biggest fixed cost, usually rent or a car, because the lever is much bigger there than on coffee.
- A raise or a bonus. The easiest time to raise your saving rate is when income rises, because you never felt the money in your daily life. A practical habit is to direct part of every raise to saving before lifestyle spending expands to fill it.
- Debt with a high rate. A loan that costs more than you could safely earn elsewhere deserves extra repayment. A cheap, long mortgage may not. The rest of this reading path covers when to prepay and when to buy or replace things.
Common mistakes
- Using gross instead of net pay, which makes every percentage look more generous than it is.
- Labelling wants as needs. A subscription you could cancel, or a car payment on a car you could swap for a cheaper one, is not automatically a need.
- Saving what is left. Make the transfer first.
- No buffer in wants. A plan with zero fun money gets abandoned in the second month. Budgets that work are ones you can live with.
- Never revisiting the plan. Review it when your income, rent or goals change, not every week.
Where to go next
Once the split is running, the next decisions are about what you buy and what you owe. When is the best time to sell your phone or car? shows how to put a monthly price on owning things. If you are comparing repayment options, the loan prepayment guide and calculator are next on this path. When the saving slice is ready to invest, dollar-cost averaging is a simple way to start. The free salary split planner is available on its own page too.
Key takeaways
- Plan with net pay and decide the split before you spend. A fixed share for the future beats saving whatever is left.
- 50/30/20 is a rule of thumb, from the 2005 book All Your Worth: 50% needs, 30% wants, 20% savings and extra debt repayment. Adjust it to your cost of living.
- Think in four jobs: needs, wants, extra debt repayment, and saving and investing.
- Pay yourself first. Automate the transfer for pay day.
- Build three months of needs as an emergency fund before long-term investing.
- Time does the heavy lifting. A small, steady amount compounds, but returns are assumptions, not guarantees.
Sources: the 50/30/20 rule and its caveats are described by N26, which attributes it to All Your Worth (2005) by Elizabeth Warren and Amelia Warren Tyagi.
Educational only — not personalised investment advice.