Published by ETF Compass · a Lambda Software product
Published and updated 18 August 2026
How the two app paths work
ETF Compass turns the monthly-deposit input into an annual contribution. In its lump-sum projection, that annual amount is deposited once each year and compounds annually. In its DCA projection, the same annual amount is split into four equal quarterly deposits and compounds at a geometric quarterly rate. An initial investment, when entered, is added at the start of the first year in both paths.
This comparison makes the timing assumption visible. It does not know when cash becomes available, whether a person can tolerate a drawdown, or whether an investment is appropriate.
More time invested and a smoother entry are different trade-offs
A lump sum puts available money to work earlier, so it experiences more of every subsequent market movement. Dollar-cost averaging (DCA) spaces purchases out. That can reduce the effect of committing all newly available cash on one date, but it also leaves some cash uninvested for longer. Neither description is a forecast and neither removes loss risk.
The useful question is practical: which funding schedule reflects when money is genuinely available and can be maintained without borrowing or disrupting essential spending? The calculator compares stated inputs; it does not choose the schedule.
Worked example: one annual amount, two schedules
€300 each month for 10 years
Enter a €0 starting balance, €300 monthly deposit, 10 years, 5% annual growth, 2% inflation, and 0.20% TER. The app treats €300 × 12 = €3,600 as the annual contribution. The lump-sum path deposits €3,600 once per year; the DCA path deposits €900 four times per year. Both show €36,000 contributed before fees and taxes. Their projected values can differ because deposits receive different periods of modelled growth and costs.
Open this illustrative comparisonChanging only the growth assumption or contribution amount is a sensitivity check, not evidence that one path will outperform in your circumstances.
Frequency can change costs as well as timing
The projection applies the entered conversion and broker fees to each deposit, and applies the total expense ratio annually to the portfolio value. More deposits can therefore mean more transaction-fee events if those inputs are non-zero. Tax treatment, bid-ask spreads, custody charges, minimum orders, and the actual broker’s schedule may differ from the model.
Before comparing two values, inspect total contributed, total fees, taxes, and the assumptions behind them. A larger projected number is not by itself a better or safer plan.
What this comparison includes—and leaves out
ETF Compass models entered deposits, return, selected fees, inflation, configured taxes, and its stress adjustment. It does not model every market path, cash interest, changing employment income, emergency reserves, trading availability, or your risk capacity. It does not select an ETF or recommend a purchase schedule.
Sources
- Investor.gov: Dollar-cost averaging (accessed 18 August 2026)
- Investor.gov: Fees and expenses (accessed 18 August 2026)
- ESMA Investor Corner (accessed 18 August 2026)
Education, not personal advice
This article is general education, not a recommendation to buy, sell, hold, or allocate to an investment. Consider regulated professional advice where appropriate to your circumstances.