What if?

  1. The question

    What if I never sold?

    $500 weekly S&P 500 DCA since 2015 held to the last date — no rebalancing out, no panic sales. Historical contributions versus ending value.

    Quick answer

    If you invested $100/week into S&P 500 from 2015-01-02 through 2026-09-04, total contributions would have been about $61,000 and a blind DCA portfolio would be worth about $159,919 (+162.2%) on this historical path — before fees and taxes.

  2. Assumptions

    What this page actually assumes

    • You keep buying $500/week.
    • You do not sell in 2018, 2020, or 2022.
    • Ending value is marked at the last Friday we publish — still invested.
    • No tax-loss harvesting, no cash-out for a house. This page is the boring hold.

  3. Historical data

    2015-01-02 → 2026-09-04

    The line includes every drawdown in the 2015+ window. If the chart looks painful in 2020 or 2022, that is the point: “never sold” is a rule you would have had to keep on those Fridays.

    Series: S&P 500. Same contribution calendar. No data before 2015.

  4. Interactive simulation

    Change the habit, stay on the real curve

    Amount
    Start year

    $100/week · S&P 500

    2015-01-02 → 2026-09-04 · $100/week · S&P 500

    Contributed$61,000
    Held to the last date$159,919
    Return+162.2%
    SteadyGrow value$207,092
    vs blind DCA+$47,174
    S&P 5002015-01-02 → 2026-09-04 · $100/week
     +$47,174 vs blind (+29.5%)Ended +29.5%
    Blind DCASteadyGrow
    $0$54k$108k$162k$216k2015-012017-052019-092021-122024-052026-09

  5. Results

    What the numbers say

    Contributed capital versus portfolio value is the hold. SteadyGrow’s line is the same rule with variable weekly size — still no selling the stack, just changing how much new cash arrives.

    The chart marks portfolio value over time for blind DCA, SteadyGrow sizing, and (when shown) a same-capital lump sum. Contributed cash rises in steps; ending value is mark-to-market on the last date. SteadyGrow ends about $47,174 ahead of blind DCA on the same long-run budget.

  6. What changes if…

    How did we calculate this?

    • Window: real market history from our published backtest bundle, typically from 2015 through the latest Friday in the series — we do not invent older decades.
    • Contribution calendar: the engine runs on a weekly Friday grid. A “monthly” habit is converted to an equivalent weekly cash rate ((amount × 12) / 52) so the same engine can compare habits.
    • Purchase timing: each period’s contribution is applied on that week’s bar in the series (close-based weekly path), not an intraday open fill.
    • Assets: S&P 500, Bitcoin, and other series we publish — USD only. No FX conversion.
    • Shares: fractional units are assumed. No brokerage commissions, bid–ask, or slippage are modeled.
    • Dividends / income: returns follow the wealth path in the backtest bundle for that asset (not a fixed 7–10% toy rate).
    • Blind DCA vs SteadyGrow: blind buys the same cash every period; SteadyGrow keeps the same long-run budget but sizes weeks from the model’s multipliers.
    • Lump sum (when shown): the same total cash as the DCA habit, invested on day one of the window, then marked to the same path.

    Frequently asked questions

    What if I never sold?
    From 2015-01-02 to 2026-09-04, $100/week into S&P 500 contributed about $61,000 and a blind DCA habit ended near $159,919 (+162.2%).
    Are these numbers a forecast?
    No. They replay published market history from 2015 onward. Future returns can look nothing like this window.
    What assumptions matter most?
    Start date, contribution size, weekly vs monthly cadence, and whether you held through drawdowns. Fees and taxes are not modeled.
    Can I change the amount or start year?
    Yes — use the chips on this page when available, or open a related what-if / calculator with a different habit.
    How is this different from a 7% compound calculator?
    Fixed-rate toys assume a smooth return. We mark contributions to a real index/crypto path, including crashes in the window.
    What if I had traded instead?
    See The Boring Alternative for story-shaped counterfactuals (options losses, round-trips), then run the same dollars through an index DCA calculator.

    What if the weekly amount wasn't always the same?

    These pages fix the contribution. SteadyGrow keeps the same long-term budget and sizes weeks from valuation — more when markets are cheap, less when they're stretched.

    Get weekly signals — $29/quarterLive $500/wk experiment →Boring Alternative →