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Updated 2026-04-20 · Investing · Educational use only ·
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Lump Sum vs DRIP Feed Investing Calculator

Lump sum vs DRIP.

Compare lump sum versus drip-feed investing strategies — see which produces the higher end value at your return and volatility assumptions.

What this tool does

This tool models two investing approaches side by side: investing a total amount all at once versus spreading that same amount into equal monthly instalments over a set period. It calculates the ending value under each strategy, assuming a consistent annual return rate applied throughout. The result shows how timing and compounding interact under your chosen conditions. The total amount to invest and the expected annual return are the primary drivers of the outcome. A typical scenario might compare investing 10,000 units immediately against investing 833 units monthly over twelve months, both at an assumed 6% annual return. The calculator does not account for fees, tax, market volatility, or changing market conditions—it illustrates outcomes under constant return assumptions only. Results are for educational modelling and do not predict actual market performance.

Quick answer: with the default values, the result is $3,957.46 (Lump Sum Advantage). Adjust the values below for your own figures.

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Formula Used
Total amount
Annual return
Months
T/m monthly

Disclaimer

Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.

Lump sum vs DRIP (drip feed / dollar-cost average) investing comparison. Vanguard study: lump sum outperforms DRIP ~67% of the time over 10 years. Why? Markets rise more than fall, so getting money in earlier captures more growth. 100k lump sum at 7% over 1 year: ~7,229 gain. 100k drip-fed monthly over 12 months at 7%: ~3,272 gain (less time in the market).

Example: 100k to invest, 7% annual return. Lump sum at start: 107,229 after 1 year. DRIP 8,333/month over 12 months at 7% annualised: 103,272 after 12 months. Lump sum advantage: 3,957 (3.96% of total). Same math holds across longer DRIP periods - longer DRIP = bigger lump sum advantage.

When DRIP wins: market crashes during DRIP period (you buy more shares cheaper). When lump sum wins: rising market (most of time). Decision factors beyond pure math: regret risk (lump-sum then 30% crash hurts emotionally even if probabilistically optimal), behavioural commitment (DRIP harder to abandon), available cash (most don't have lump sums - DRIP is the only option). A combined pattern some investors describe is putting the cash they already hold in as a lump sum, then drip-feeding new income as it arrives.

Run it with sensible defaults

Using total amount to invest of 100,000, expected annual return of 7%, drip period of 12, the calculation works out to 3,957.46. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Total Amount to Invest, Expected Annual Return %, and DRIP Period (months) — do not pull with equal force. The rate and the time horizon usually dominate — compounding means a small change in either reshapes the final figure more than a similar shift in contribution size. Test this by doubling one input at a time.

How the math works

Lump sum compounded for full period vs equal monthly investments compounded.

Why investors run this

Compounding is easy to underestimate when it is pictured mentally rather than calculated, because steady percentage growth produces a curve rather than a straight line. Running the numbers through a calculator like this one shows how sensitive a long-horizon result is to small differences in the rate or the time period.

What this doesn't capture

This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.

Example Scenario

£100,000 lump vs DRIP over 12mo at 7% = $3,957.46.

Inputs

Total Amount to Invest:£100,000
Expected Annual Return %:7%
DRIP Period (months):12
Expected Result$3,957.46
Expected Result breakdown
Lump Sum FV$107,229.01
DRIP FV$103,271.54
Advantage % of Total3.96%
DRIP Period12 months

This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.

Sources & Methodology

Methodology

This calculator models the difference between investing a lump sum upfront versus spreading the same total amount across equal monthly instalments over time. It applies compound interest using a monthly compounding approach. The lump sum portion is compounded at the specified annual return rate for the full investment period. The monthly investment portion uses the future value of annuity formula, treating each instalment as compounding from its deposit date until the end of the period. The model assumes a constant monthly return rate derived from the annual return, consistent growth without interruption, and no fees or taxes. It does not account for market volatility, variations in actual returns, timing of cash flows within months, or investment costs.

Frequently Asked Questions

Lump sum or DRIP - the verdict?
On the maths alone, historical studies have found lump sum ahead of drip-feeding in roughly two-thirds of 10-year periods, because money invested earlier spends more time compounding. The behavioural side runs the other way: drip-feeding can reduce the regret of committing a lump sum just before a fall. A common middle-ground pattern some investors describe is putting part of the total in now and spreading the rest over several months, capturing much of the lump sum's edge while softening the timing risk. The right balance depends on personal circumstances and risk tolerance.
Why does lump sum win?
Markets are positive sum - rise more than they fall over time. 100k invested 12 months earlier captures more compounding. DRIP keeps cash uninvested and earning nothing during drip period - opportunity cost. Lump sum = no cash drag. The 33% of the time DRIP wins is during market crashes - rare but psychologically meaningful.
What if I'm worried about market timing?
Reliable market timing is notoriously difficult, and reaching an all-time high or a recent crash has historically been a weak predictor of the next year's direction. Given that uncertainty, one common framing is that putting an available lump sum to work sooner captures more compounding, while spreading it over a few months is a way some investors ease the timing risk. Stretching that spread across several years starts to resemble market timing in itself, which reintroduces the guesswork it was meant to avoid.
Tax considerations?
A lump sum is a single transaction, so its tax tracking is simpler. Drip-feeding creates multiple purchases and a more complex cost basis, especially once sales are involved. Inside a tax-advantaged retirement account, the two approaches make no difference for tax; in a taxable account, the lump sum is slightly simpler to track. Holding either approach within a tax-advantaged account removes most of that tax-tracking complexity.

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