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Results are hypothetical illustrations based on the numbers you enter and simple assumptions: a constant return, with no taxes, fees or inflation unless stated. They are not predictions or guarantees; real returns vary from year to year and can be negative, and investing can lose money. Educational content only. Not financial advice. See our Disclaimer.
Quick answer: If you would invest the money, a lump sum usually beats payments that only add up to a bit more, because it compounds from day one: $1M today invested at 8% becomes about $2.16M in 10 years, versus about $1.80M for $10,000 a month. If you would just spend it, the bigger plain total wins. And a penny doubled every day for 30 days is $5,368,709.12, so it beats $1M.
How to think about “$1M today or $X per month”
Most people answer with their gut. The math has two parts: the plain total of the payments, and what each option is worth if the money is invested as it arrives. A lump sum compounds from day one; payments start small and only catch up if they run long enough.
Rule of thumb at 8%: a lump sum beats payments that total less than about 1.5× the lump over 10 years. Over 30 years the payments need to total more than about 2.5× the lump to win.
The penny trick
A penny doubled every day for 30 days is $5,368,709.12. On day 20 it is only $5,243. Nobody feels that curve in their gut — which is exactly why the question is fun, and why starting early matters more than starting big.
From the channel
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$1 million today or $10,000 a month for 10 years?
The payments total $1.2M, so in plain cash they win. Invested at 8%, $1M today grows to about $2.16M in 10 years while the payments grow to about $1.8M — the lump sum wins by roughly $350,000. At 0% the payments win; at any return above roughly 3.7% the lump sum wins.
Is $1 million better than a penny doubled every day for a month?
For 30 days the penny becomes $5,368,709.12 — more than five times the million. For 26 days or fewer the million wins ($335,544 on day 26). The answer flips on day 28.
$3,000 a day for a year or $1 million?
$3,000 × 365 = $1,095,000 in plain cash, so the daily payments win by $95,000 — and invested as they arrive they come out about $1.14M vs $1.08M for the lump at 8%.
How do you compare a lump sum with monthly payments?
Compare what each option is worth at the same date, using the return you would actually earn. Grow the lump sum forward, grow each payment from the day it arrives, and see which is bigger. This calculator does that, and also shows the plain cash total (0% return).