DCA: The Monthly Investing Strategy That Works

DCA (Dollar Cost Averaging) is the simplest and most effective strategy for individual investors: invest a fixed amount every month, automatically, regardless of market conditions. Here's why it works and how to set it up.

What Is DCA?

Dollar Cost Averaging means investing a predetermined fixed amount at regular intervals: typically monthly — regardless of whether markets are up, down, or sideways.

Instead of trying to buy at the bottom and sell at the top (impossible to do consistently), you just invest €X every month, forever. The market does the rest.

Why DCA Beats Market Timing

Market timing means trying to invest when prices are low and sell when they're high. It sounds obvious. In practice, it doesn't work:

• Professional fund managers fail to time the market consistently: 85%+ underperform a simple index fund over 15 years (SPIVA)
• Missing the 10 best market days over 20 years cuts your return roughly in half
• The best days often come right after the worst days — exactly when emotion tells you to stay out

DCA removes the decision entirely. You invest on a schedule, not based on market moods.

DCA vs Lump Sum: What Does the Research Say?

Mathematically, if markets go up over time (which they do historically), investing a lump sum immediately beats DCA about two-thirds of the time: because your money is invested sooner and benefits more from compounding.

But DCA wins in two real-world scenarios:

• You don't have a lump sum: you're investing from monthly income. DCA is the only option.
• Volatility is high: DCA reduces the psychological risk of investing at an all-time high right before a crash.

For most people building wealth from a salary, DCA is the practical default. It's not theoretically optimal — it's behaviourally optimal.

How to Set Up a DCA in 3 Steps

Step 1: Decide on Your Monthly Amount

Start with what you can afford without touching it for 10+ years. €50 is enough to start. You can always increase later. The key: this money cannot be your emergency fund — it's gone from your mental budget.

Step 2: Pick Your Day

The 5th of the month (just after most paydays) is a popular choice. Consistency matters more than the specific date — the research shows no significant difference between investing on the 1st vs the 15th vs the 28th.

Step 3: Automate It Completely

Set up two automatic transactions:

• Automatic transfer from your bank → brokerage account (same day each month)
• Automatic buy order in your brokerage (Trade Republic, BoursoBank, etc. all support this)

Once automated, you never make a decision again. The discipline is in the setup, not the execution.

DCA Simulation: €200/Month Over 20 Years

Total contributed: €24,000 (10y) / €48,000 (20y) / €72,000 (30y). Projections at constant rate, pre-tax. Past returns don't guarantee future performance.

Frequently Asked Questions