How much should I invest monthly?
The common rule of thumb: around 10 to 15% of your net income. More important than the exact amount is simply starting regularly — even €25 to €50 a month pays off thanks to compound interest. Build the emergency fund first, then start the savings plan. Here is the guidance by income.
The rule of thumb: 10 to 15% of net income
As a rough guide: invest about 10 to 15% of your monthly net income for the long term. Those who can do more benefit more; those who can do less still get started. What counts is consistency and staying power — not the perfect amount. An ETF savings plan can be adjusted, paused or increased at any time.
Guidance by net income
Example savings rate (10–15% of net income)
| Net/month | 10% | 15% |
|---|---|---|
| €1,500 | €150 | €225 |
| €2,500 | €250 | €375 |
| €3,500 | €350 | €525 |
| €5,000 | €500 | €750 |
The right order
- 1. Emergency fund: 3–6 months of expenses in an instant-access savings account before you invest in ETFs.
- 2. Pay off expensive debt: overdrafts and consumer loans cost more in interest than an ETF returns on average.
- 3. Start the savings plan: put the freely available amount automatically into a broad global ETF.
- 4. Increase it with your income: raise the savings rate with every pay rise.
Equity ETFs fluctuate. Only invest money you won’t need for at least 10 to 15 years, so you can sit out crashes. If you need money in the short term, keep it in an instant-access savings account or a money-market ETF — not in an equity savings plan.
Working backwards from a goal: the rate you need for €100,000
Instead of thinking only in percentages of income, you can also calculate backwards: what monthly rate do I need for a concrete goal? The table below shows the rate required to reach €100,000, assuming 6% average annual return:
Monthly rate needed for €100,000 (6% p.a., example)
| Time horizon | Monthly rate needed | Of which paid in yourself |
|---|---|---|
| 10 years | ~€610 | €73,200 |
| 15 years | ~€344 | €61,900 |
| 20 years | ~€216 | €51,800 |
| 25 years | ~€144 | €43,200 |
Two things stand out. First: time replaces savings rate. With 25 years to go, you need less than a quarter of the monthly rate of someone with 10 years — and you pay in €30,000 less out of your own pocket, because compounding does the rest. Second: even “small” rates grow into serious sums if the horizon is long enough.
For practical purposes this means: if 10 to 15% of your net income currently only allows €100 a month, that is no reason to wait until “there is more room”. An early start with a small rate beats a late start with a big rate surprisingly often — and you can raise the rate with every pay rise.
The example assumes you keep investing without interruption. The most common real-world mistake is pausing the savings plan right in the middle of a crash — exactly when your money buys the most shares. Choose a rate you can comfortably sustain in bad market years rather than saving at your absolute limit.
FAQ — How much to invest monthly
How much should I invest monthly in ETFs?
The rule of thumb is 10 to 15% of your net income. On €2,500 net, that would be €250 to €375 a month. More important than the exact figure is investing regularly and for the long term — even €25 to €50 a month is a sensible start thanks to compound interest.
Is an ETF savings plan of €50 a month worth it?
Yes. Even small amounts grow substantially over long periods. €50 a month over 30 years at an assumed 7% comes to around €61,000 — on €18,000 paid in. Compound interest makes the difference, and you can raise the rate later at any time.
What should I sort out before investing?
First build an emergency fund of 3 to 6 months’ expenses in an instant-access savings account and pay off expensive debt such as an overdraft. Only then do you start the ETF savings plan. That way you won’t have to sell shares at a bad moment in an emergency.
Should I invest a lump sum or monthly?
Both work. A monthly savings plan (cost-averaging) is ideal if you save out of your regular income and want to invest steadily and calmly. If you have a larger sum ready, a lump-sum investment statistically tends to do slightly better — but staggered investing is psychologically easier to stick with.
Should I raise my monthly rate every time my salary increases?
Yes — it is one of the most effective tricks there is. If you raise the rate whenever your pay goes up, you barely feel the sacrifice, because that money never reached your everyday account in the first place. A proven rule of thumb is to put about half of every net pay rise into the savings plan. Many brokers also offer an automatic escalation feature that increases your plan by, say, 2 to 5% per year without you lifting a finger.
How do I invest with an irregular income, for example as a freelancer?
Set the fixed monthly rate deliberately low — at a level you can safely cover even in weak months, for example 5% of a typical month’s income. In good months, top it up with one-off purchases. With a fluctuating income you should also hold a larger emergency fund of around 6 to 12 months of expenses, so that a dry spell never forces you to sell from your portfolio.