What to do with new money: DCA vs lump sum
Each tool has a specific job. Beginners default to the wrong one.
TL;DR — Every month, new money arrives. What you do with it matters. There are two approaches: invest it in small regular amounts over time (DCA), or invest it all at once (lump sum). Each has a specific situation where it makes sense. Beginners almost always default to the wrong one.
Most beginners have no process for deploying new money. They wait until the amount feels "meaningful," then look for something interesting, then buy whatever is currently performing well. This is portfolio management by feeling, and it typically produces bad outcomes.
There are two tools for deploying new capital, and they serve different purposes.
DCA (Dollar-Cost Averaging) for rebalancing existing positions. DCA means investing a fixed amount at regular intervals, regardless of what the market is doing. When applied to an existing portfolio, its best use is restoring positions that have drifted below their target allocation.
Say your gold target is 20 percent but it sits at 13 percent because gold underperformed while your equities ran. Instead of selling equities (which triggers a tax event) to buy gold, you direct your monthly savings into gold until it is back at 20 percent. Over three or four months, the allocation is restored. No sales, no tax, no disruption to the rest of the portfolio.
The rule: before deploying new money anywhere, scan your existing positions for anything below target. Fill those gaps first.
DCA also works as a way to enter a position gradually when you have conviction but are uncertain about short-term timing. Instead of putting 10 percent into a new position in one transaction, you put in 3 percent per month for three months. You average your entry price, and you give yourself time to confirm the thesis is playing out.
Lump sum for when there is no strong case for gradual entry. Research consistently shows that, on average, investing a lump sum outperforms spreading it out over time. This is because markets trend upward over the long run, so every month you wait with cash, you are probably paying a higher price.
The case for lump sum: you have a clear thesis, the macro regime supports it, the position is small enough to fit within your limits, and there is no specific reason to think the next few months will offer meaningfully better prices. Put it in now.
The case for DCA: you are restoring an underweight position and want to avoid a single large buy at an uncertain price. Or you are entering a new position where short-term timing is genuinely uncertain but the long-term thesis is clear.
The one thing to avoid: spreading out an investment purely out of anxiety, with no strategic reason. That is not DCA. That is hesitation with a name.
Example — An investor receives a 5,000 euro bonus. Before doing anything else, they check their portfolio. Gold is at 12 percent (target: 20 percent). Energy is at 15 percent (target: 15 percent, fine). All other positions are near target. They put 3,000 euros straight into gold to close most of the gap (near lump sum makes sense here, since gold is an existing position they know well). The remaining 2,000 euros they hold back to top up gold the following month. No new positions opened until all existing targets are restored.