Yearly lump vs monthly: how different for the S&P 500?
Putting in a year-end bonus at once versus spreading it monthly from your paycheck differs in how much you spread out entries. It is a method comparison tied to real-life cash flow.
Investment conditions
Asset · S&P 500 (SPY)
Method · Comparison
The yearly method puts a full year's amount in at once, so it is strongly affected by that year's entry timing. A good moment helps, but piling in near a peak exposes that year's money to a large drawdown right away. The monthly method spreads entry into 12 points and reduces single-moment risk. In a long rising window, the yearly method that deploys money earlier can hold a slight edge from longer exposure, but its entry-timing risk is greater than monthly. In real life, when your money arrives often decides the method: a once-a-year lump like a bonus fits yearly, and a slice from each paycheck fits monthly.
Open in comparison calculatorWhy this period and asset
From July 2014 to July 2024, the S&P 500 rose steadily while passing through the late-2018 and early-2020 drops and the deep 2022 correction. The yearly-lump method concentrates entry into one moment per year, while the monthly method spreads entry into 12 finer points.
Caveats & limits
There is no right answer; the edge between yearly and monthly depends on that year's entry timing and the market phase. The yearly method carries relatively greater entry-timing risk. This comparison is a simplified simulation that ignores taxes, fees, and currency effects, and past performance does not guarantee the future. As a USD asset, returns in won depend on exchange rates.
Data sources & limits
- Trading fees and taxes are not reflected — figures are pre-tax.
- Based on historical data; does not guarantee future returns.
Frequently asked questions
Yearly or monthly — which won?
In a long rising window, the yearly method that deploys money earlier can hold a slight edge from longer exposure, but its entry-timing risk is greater than monthly. Piling in at a peak exposes that year's money to a large drawdown at once. Results shift with the market phase, so it cannot be settled.
When does each method fit?
When your money arrives is the practical guide. A once-a-year lump like a bonus fits yearly; a slice from each monthly paycheck fits monthly. Rather than forcibly holding money to pile in, investing as it arrives is usually reasonable.
What effect does spreading entries have?
Spreading entry into 12 points reduces the risk that one day's entry decides the whole year. In return, if only strong rallies occurred, the yearly method that piled in early may capture more of the rise, so spreading is not always a gain.
Related scenarios
📋 结果基于历史数据计算,过去的收益不代表未来的收益。
📋 本服务旨在帮助理解投资、供教育之用,并非投资建议。
⚠️ 各资产的波动性与风险水平不同,仅凭收益率无法判断孰优孰劣。