How Much Should You Invest Every Month? The 2026 Guide

Written by Cripto Adicto 20 Jun 2026 · Last updated: 15 Jul 2026 · 8 min read

"How much should I invest every month?" is one of the most common questions new investors ask — and the honest answer is that there is no single magic number. The right amount depends on your income, your fixed costs, your goals and your time horizon. What never changes is the principle behind it: a smaller amount invested consistently for decades almost always beats a larger amount invested erratically. This guide gives you a clear, repeatable framework to choose your number with confidence.

1. Think in Percentages, Not Fixed Amounts

Instead of fixating on a euro figure, start with a percentage of your net income. A widely cited target is to invest 15–20% of your take-home pay toward long-term goals. If that feels out of reach today, start with 5–10% and raise it over time. Percentages scale automatically as your salary grows, so your investing keeps pace with your life without you having to recalculate every year.

2. The 50/30/20 Rule as a Starting Point

The 50/30/20 budget is a simple way to find your number: roughly 50% of net income for needs (rent, food, transport), 30% for wants, and 20% for saving and investing. That 20% covers both your emergency fund and your investments. Once your emergency fund is in place, most of that 20% can flow straight into a diversified portfolio. Use our savings calculator to see how your chosen percentage grows over time.

3. Work Backwards From Your Goals

The other way to set your number is to start with the goal and work backwards. Want €500,000 by retirement in 30 years? At a 7% average annual return, you would need to invest roughly €410 per month. Want a €30,000 house deposit in 5 years? That is closer to €430 per month in a low-risk account. Define the goal, the deadline and the expected return, and the monthly amount reveals itself.

4. Why Consistency Beats the Amount

Thanks to compound interest, the habit matters more than the size of each contribution. €100 per month at a 7% return becomes about €17,400 in 10 years, €52,000 in 20 years and €122,000 in 30 years. Doubling the amount doubles the result, but doubling the time more than quadruples it. That is why starting now with a modest amount beats waiting until you can afford a large one. See the math in our compound interest calculator.

5. Adjust for Your Age and Time Horizon

Younger investors with decades ahead can afford to invest a higher share into growth assets like equity ETFs, because they have time to ride out volatility. As you approach a goal, gradually shift toward lower-risk holdings so a market dip near the finish line does not derail you. The monthly amount can stay the same; what changes is where it goes. If you are just getting started, read our guide on how to start investing with little money.

6. Automate It, Then Increase It With Every Raise

Set up an automatic transfer on payday so your investment happens before you can spend the money. Then adopt one powerful habit: every time you get a raise, redirect a meaningful slice — say half of the net increase — into your monthly contribution. This "save half your raises" rule lets your lifestyle improve while your investing accelerates, turning a €100/month plan into €300+/month within a decade without any painful sacrifice.

Cripto Adicto · Founder of WealthCalcApp · 6+ years in crypto & finance

Passionate about finance and investing, with more than 6 years of hands-on experience in the crypto world. He shares analysis and financial education on his YouTube channel, Cripto Adicto.

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