TheContribution.
What time and continued saving can build.
Gary starts earlier. Cindy saves for longer. They put aside the same amount each month, but at different points in their lives. See what those years bring to the picture.
GARY / CINDY · THE STARTING POINT
The same $300.
Different years.
Two people put aside $300 a month, at different times. Gary starts at 25 and stops adding at 35. Cindy starts at 35 and continues through 65. Follow what happens.
$300 / month · ages 25–35
$300 / month · ages 35–65
GARY / AGES 25–35
Gary’s first
ten years.
Gary adds $300 a month from 25 to 35—a total of $36,000. Cindy is about to begin. Under the stated return assumption, Gary’s deposits have also grown.
Small deposits.
Ten years of showing up.
Gary · stops adding at 35
10 years of saving
Money added $36,000
Illustrated growth $10,309
Cindy · starts now
First monthly deposit comes next
Money added $0
Illustrated growth $0
$300/month · $0 start · assumed 5% effective annual return
Growth reinvested; before taxes, fees & inflation. Study notes
CINDY / AGES 35–45
Cindy’s first
ten years.
Gary has stopped adding. Cindy now begins $300 monthly deposits and keeps going. Over these ten years, she adds $36,000.
Her first course is in place.
And she is still building.
$36,000 addedNext 10 yearsFinal 10 years
Ten years of $300 monthly deposits. Cindy continues in the next scene.
BOTH / AT AGE 45
Same $36,000.
Different time.
At 45, Gary and Cindy have each added $36,000. Gary stopped adding at 35; Cindy is still adding. Gary’s money has had longer to grow under this assumption.
The same dollars went in.
They did not have the same time.
Gary · started at 25, stopped at 35
10 years of saving
Money added $36,000
Illustrated growth $39,432
Cindy · started at 35, still adding
10 years of saving
Money added $36,000
Illustrated growth $10,309
$300/month · $0 start · assumed 5% effective annual return
Growth reinvested; before taxes, fees & inflation. Study notes
CINDY / AGES 45–65
Keeping going
changes the picture.
Cindy does not stop at 45. She keeps investing $300 a month for twenty more years, adding another $72,000. Across the full 35–65 span, she adds $108,000.
The same monthly step.
Twenty more years of building.
$36,000Added 45–55
$36,000Added 55–65
$36,000
CINDY / TWO SELECTED YEARS, VIEWED AT 65
Two years inside Cindy’s thirty.
Cindy saves $300 every month from 35 through 65. Compare just two years within that continuous schedule: her twelve deposits from 35–36 and her twelve from 55–56. She also saves in every year between.
$3,600 invested during that year
+ $11,555 hypothetical growth by 65
$3,600 invested during that year
+ $2,112 hypothetical growth by 65
Both examples are portions of Cindy’s one illustrated balance—not separate accounts or forecasts. The time bars share one 30-year scale.
CINDY / TWO PERIODS, VIEWED AT 65
Two periods. One balance.
Cindy added $36,000 in her first ten years, then $72,000 over the next twenty. Under the same assumed return, the earlier deposits had more time. The two groups reach nearly the same illustrated value at 65.
Cindy / deposits from 35–45 Her first ten years of monthly deposits
Cindy / deposits from 45–65 Her next twenty years of monthly deposits
BOTH / AT AGE 65
What their saving
became.
Gary contributed for ten years; Cindy kept going for thirty. Their age-65 balances reflect both money added and hypothetical growth under the same assumption.
Time mattered.
So did keeping going.
Gary · stopped adding at 35
10 years of saving
Money added $36,000
Illustrated growth $164,145
Cindy · kept adding through 65
30 years of saving
Money added $108,000
Illustrated growth $136,613
$300/month · $0 start · assumed 5% effective annual return
Growth reinvested; before taxes, fees & inflation. Study notes
BOTH / THE WHOLE PICTURE
What must this
money support?
Time mattered. Continuing to add mattered. Neither illustrated balance alone tells Gary or Cindy what they can spend in retirement.
Income, obligations, timing, and the life the money must support shape that next question.
GARY
Ten years of adding.More time after deposits stopped.$36,000 added · $200,145 illustrated at 65CINDY
Thirty years of adding.Contributions continued through 65.$108,000 added · $244,613 illustrated at 65Income · Obligations · Timing · Life to support
THE STUDY / ALL THE WORKING
Nothing hidden in the layers.
| Age / Measure | Gary | Cindy |
|---|---|---|
| 35 / Money added | $36,000 | $0 |
| 35 / Growth | $10,309 | $0 |
| 35 / Total | $46,309 | $0 |
| 45 / Money added | $36,000 | $36,000 |
| 45 / Growth | $39,432 | $10,309 |
| 45 / Total | $75,432 | $46,309 |
| 65 / Money added | $36,000 | $108,000 |
| 65 / Growth | $164,145 | $136,613 |
| 65 / Total | $200,145 | $244,613 |
Gary and Cindy’s schedules
Both begin with $0 at age 25. Gary makes 120 monthly deposits: first one month after age 25, final one at age 35. His balance then stays invested for thirty years without more deposits. Cindy makes 360 monthly deposits: first one month after age 35, final one at age 65. Neither makes withdrawals.
What the drawing measures
Both structures have equal widths. Their heights show accumulated dollars with the same dollars-per-unit-height at every checkpoint. Unused space above a checkpoint is omitted; the structures themselves are never enlarged to fill it. Solid material is contributed money; translucent material is hypothetical growth. One complete solid course represents $36,000: ten years of $3,600. Its ten modules represent annual contributions. Lighting, paper, and surface details do not add money. The decade timelines use horizontal distance for ages 35–65: each equal block is ten years of $300 monthly deposits, or $36,000 added. Their height is decorative. The ordinary appearance control never changes the figures.
The assumption
The effective annual return is 5%, converted to i = 1.05^(1/12) − 1, approximately 0.407412% monthly. Each prior monthly balance grows by this rate, then the month-end deposit is added. Growth is reinvested. There are no taxes, fees, employer contributions, withdrawals, or inflation adjustments in this illustration.
Monthly calculation, annual origins
Each deposit grows for the exact number of remaining months. Grouping deposits by their contribution year does not turn them into annual lump sums. At 65, Gary’s total is 300 × ((1+i)^120 − 1) / i × (1+i)^360; Cindy’s total is 300 × ((1+i)^360 − 1) / i. Those formulas are checked against monthly accumulation and annual-cohort sums before rounding.
What this does not promise
A constant positive return makes the relationships visible. Actual returns vary and can be negative. Losses, inflation, fees, taxes, and withdrawals can materially change the results. Neither history is a recommendation, a judgment about when someone should begin, or an investment-performance ranking.
Reading the focused details
The focused source strips use the same age-65 figures as the comparison. Their lengths share a $0–$250,000 scale, with solid money added and hatched hypothetical growth; they do not add another balance. The annual examples isolate two selected years within Cindy’s continuous 35–65 schedule: deposits made at ages 35–36 and 55–56. They were invested for approximately 29–30 and 9–10 years respectively, depending on the deposit month. Their time bars share a thirty-year scale.
| Contribution source | Money added | Growth | Total |
|---|---|---|---|
| Gary / 25–35 | $36,000 | $164,145 | $200,145 |
| Cindy / 35–45 | $36,000 | $86,871 | $122,871 |
| Cindy / 45–65 | $72,000 | $49,741 | $121,741 |
| Cindy / age 35–36 | $3,600 | $11,555 | $15,155 |
| Cindy / age 55–56 | $3,600 | $2,112 | $5,712 |
Cindy’s final twenty years add $72,000, or two-thirds of its $108,000 contributions. The two one-year examples are subsets of the decade groups, not extra deposits. Rounded displayed components may differ from rounded totals by $1.
General education, not personalized financial or investment advice. These are modeled illustrations—not predictions, guarantees, or investment recommendations. Compounding background: SEC Investor.gov.
The story continues.
Now ask what the money can support.
The illustrated balances for Gary and Cindy show what accumulated under one assumption. Studio helps you examine your own income, obligations, timing, and the life your money must support.
Explore your own structure in Studio Return to the Reference Desk