How to start an ETF savings plan in Europe with €100 a month
The ETF savings plan — a fixed monthly purchase of an index fund, executed automatically by your broker — is arguably Europe's biggest contribution to retail investing. It removes the two hardest parts of investing: deciding when to buy, and remembering to do it. Here is how to set one up from scratch with as little as €100 a month, and what to realistically expect from it.
Step 1: choose a broker that supports savings plans
Not every broker offers automated ETF savings plans, and among those that do, execution fees differ enormously — from €0 per execution to a percentage of each purchase. At €100 a month, fees matter more than almost anything else: a €1.50 execution fee is an immediate 1.5% loss on every contribution, which no fund selection skill will claw back. Look for a broker that executes savings plans free or near-free, supports fractional shares so your full €100 is invested, and is supervised by an EU regulator with investor compensation coverage.
Also check the practical details that guides often skip: which exchange the plan executes on, whether you can pause or change the amount without penalty, and whether the broker automatically reinvests any distributions if you pick a distributing fund.
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Step 2: pick one broadly diversified UCITS ETF
Beginners routinely over-engineer this step. A single, broadly diversified, low-cost UCITS ETF tracking a global index — MSCI World, FTSE All-World or MSCI ACWI — is a complete portfolio on its own, holding between 1,500 and 4,000 companies across developed (and optionally emerging) markets. The screening criteria that matter: a total expense ratio (TER) at or below roughly 0.25%, fund size above €500 million so closure risk is negligible, physical replication if you prefer holding real shares, and an accumulating share class so dividends reinvest automatically.
Resist the temptation to add a second fund because it performed well recently. Overlapping indices — MSCI World plus S&P 500, for instance — do not diversify you; they concentrate you, because the S&P 500 already makes up roughly two-thirds of MSCI World.
Step 3: automate it and understand euro cost averaging
Set the plan to execute a day or two after your salary arrives, so investing happens before discretionary spending can compete with it. Buying a fixed euro amount monthly means you automatically purchase more shares when prices are low and fewer when they are high — euro cost averaging. Its real value is not mathematical outperformance (a lump sum invested earlier usually wins on average) but behavioural: it converts market drops from something frightening into something that quietly improves your average purchase price.
What can €100 a month become? Using a real annual return of 5% after inflation — in line with long-run global equity history, though never guaranteed — €100 a month compounds to roughly €41,000 in 20 years and €83,000 in 30 years, of which only €24,000 and €36,000 are your own contributions. The rest is compounding. Run your own assumptions through our Monte Carlo calculator to see the full range of outcomes, not just the average: real markets deliver that average through decades that feel nothing like average.
The mistakes that undo a good savings plan
The plan itself is simple; staying out of its way is not. The most expensive mistake is pausing contributions during a crash — the exact months when your fixed €100 buys the most shares. The second is tinkering: swapping funds after a bad year, adding a trendy sector ETF, or moving brokers to chase a promotion, each time crystallising costs and sometimes taxes. The third is checking the balance daily; a monthly plan needs a yearly glance. Set a calendar reminder to review once a year — raise the contribution if your income grew, confirm the fund still has a competitive TER, and otherwise close the tab. Boring is the strategy working.
Key takeaway
A free-execution broker, one global UCITS ETF, and an automated monthly order you never touch: that is the entire system. The hard part is not setting it up — it is leaving it alone for twenty years.
This article is educational content, not investment advice. Capital is at risk; past performance does not predict future returns. Tax treatment depends on your individual circumstances and country of residence.