Stress case
$17,526
4% return with a 25% drawdown in year 5.
Model how contributions and investment growth can compound over time with a clear split between money added and growth earned.
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| Year | Contributed | Growth | Balance |
|---|---|---|---|
| 1 | $10,000 | $723 | $10,723 |
| 2 | $10,000 | $1,498 | $11,498 |
| 3 | $10,000 | $2,329 | $12,329 |
| 4 | $10,000 | $3,221 | $13,221 |
| 5 | $10,000 | $4,176 | $14,176 |
| 6 | $10,000 | $5,201 | $15,201 |
| 7 | $10,000 | $6,300 | $16,300 |
| 8 | $10,000 | $7,478 | $17,478 |
| 9 | $10,000 | $8,742 | $18,742 |
| 10 | $10,000 | $10,097 | $20,097 |
| 11 | $10,000 | $11,549 | $21,549 |
| 12 | $10,000 | $13,107 | $23,107 |
| 13 | $10,000 | $14,778 | $24,778 |
| 14 | $10,000 | $16,569 | $26,569 |
| 15 | $10,000 | $18,489 | $28,489 |
| 16 | $10,000 | $20,549 | $30,549 |
| 17 | $10,000 | $22,757 | $32,757 |
| 18 | $10,000 | $25,125 | $35,125 |
| 19 | $10,000 | $27,665 | $37,665 |
| 20 | $10,000 | $30,387 | $40,387 |
| 21 | $10,000 | $33,307 | $43,307 |
| 22 | $10,000 | $36,438 | $46,438 |
| 23 | $10,000 | $39,795 | $49,795 |
| 24 | $10,000 | $43,394 | $53,394 |
| 25 | $10,000 | $47,254 | $57,254 |
Stress case
$17,526
4% return with a 25% drawdown in year 5.
Base case
$49,320
Return net of 0.2% fees and 0.4% tax drag, with contributions rising 3%/yr.
Upside case
$103,900
10% gross return under stronger market conditions.
No monthly contribution is set, so the plan depends entirely on the starting balance and market returns.
Adding $250/month reaches the goal about 1.3 years earlier.
Lump sum often wins because more money spends more time invested, though DCA can reduce regret and timing risk.
Enter your starting amount, monthly contribution, assumed annual return, time period, and compounding frequency. The chart separates your own contributions from investment growth so the source of the final portfolio value is easy to inspect.
Monthly compounding applies growth each month after the monthly contribution. Annual compounding applies the annual return at the end of each year. Real investment accounts can behave differently because market returns vary, fees reduce returns, and deposits may happen on different days.
Use this as a scenario model. Try conservative, moderate, and ambitious return assumptions to understand which part of the outcome depends on your savings behaviour and which part depends on market performance.