Will Your Plan Actually Leave Anything Behind?
Most people never decide whether they're spending to enjoy retirement or spending to protect an inheritance. They just under-spend out of fear — which quietly answers the question anyway, without anyone choosing it on purpose.
- "Spend confidently now" and "leave money behind later" aren't the same goal wearing different clothes — they're two different plan designs, and most people default into one without ever deciding.
- A static withdrawal rate wasn't built to hit a legacy number on purpose. It either overshoots it or undershoots it almost by accident, because it never looks at the target at all.
- You can see how your own numbers actually play out below — free, no signup, nothing leaves your browser.
The choice nobody makes on purpose
Ask most people planning retirement whether they want to leave an inheritance, and they'll say something like "sure, if there's anything left." That answer sounds neutral. It isn't. Left unexamined, it almost always resolves the same way: toward under-spending. Fear of running out is a stronger force than the vague hope of leaving something behind, so people quietly ratchet spending down below what their plan can actually support — not because they decided a bequest mattered more than their own retirement, but because "just in case" felt safer than checking the math.
That's the part worth naming plainly. Under-spending out of uncertainty isn't a neutral default — it is a decision to prioritize a legacy, made without anyone consciously making it. The money doesn't care why it wasn't spent. Whether you meant to protect it for heirs or just couldn't bring yourself to draw it down, the outcome on your bank statement looks identical. The only difference is whether you got to actually enjoy the years you were saving it for.
If you never decided how much to leave behind, your spending habits already decided for you — you just haven't seen the number yet.
"Die with zero" and "leave $X behind" are different plans
These aren't two flavors of the same goal — they're structurally different plans that pull the spending dial in opposite directions.
- A die-with-zero plan spends down the portfolio on purpose, treating an ending balance near $0 as a win rather than a shortfall. The logic: money still sitting in an account at death is money that funded nobody's life — not yours, not anyone's. This isn't reckless. Done properly it still requires a real simulation to find the highest spending level that keeps the risk of running out too early acceptably low. It's optimized spending, not unlimited spending.
- A leave-$X-behind plan reserves capacity deliberately. It caps spending below what the portfolio could otherwise support, specifically so a target number survives for heirs, a cause, or an estate goal. That target isn't a leftover — it's a line item the plan is built around, the same way monthly spending is.
Run the same starting balance through both designs and the spending gap between them compounds for decades. A household that could support $7,000/month spending under a die-with-zero design might be capped closer to $5,500/month under a $500,000-legacy design — same savings, same market assumptions, genuinely different lived retirement. Neither answer is wrong. What's wrong is not knowing which one you're actually running.
Why a static withdrawal rate misses the target almost by accident
The "4% rule" and its relatives were built to answer one question: how much can be withdrawn annually without running out over roughly 30 years? That's a survival question, not a legacy question. A flat withdrawal-rate rule has no target balance for heirs baked into it anywhere — it wasn't designed to land on $0, and it wasn't designed to land on $500,000 either. It just runs, and whatever's left at the end is whatever's left.
That means a static-rate plan hits a specific legacy number, if it hits one at all, by luck. In a strong market decade, the same 4% withdrawal that was supposed to be conservative can leave a household's heirs several times more than intended, because the rule never looked at the target and throttled spending to protect it — or to release more of it. In a weak decade, the same rule can leave far less than a family was counting on, with no warning built into the plan that it was drifting away from the goal. A rule that doesn't know your target can't be expected to hit it.
Designing toward an actual legacy number — or toward $0 on purpose — requires the opposite approach: start from the target, and work backward to the spending level and asset mix that gets there across a realistic range of markets, not one static formula applied blind.
Sequence-of-returns risk doesn't just threaten survival — it threatens the bequest
Sequence-of-returns risk usually gets discussed in terms of whether a plan survives at all — does the money run out, yes or no. That framing undersells the effect on a legacy specifically. A downturn in the first several years of retirement forces withdrawals out of a portfolio that's already shrinking, and that damage compounds for the rest of the retirement, even in scenarios where the plan technically "succeeds" by never running dry.
Picture two households with identical starting balances, identical spending, and identical average returns over a 30-year retirement — the only difference is which years the down markets land in. Both plans might report a 90%+ success rate. But the household that hit the bad sequence early can end up leaving a fraction of what the household with the favorable sequence leaves, purely because early losses never got the decades of compounding needed to recover before more withdrawals were taken against them. "The plan succeeded" and "the plan left a meaningful inheritance" are two different bars, and a plan can clear the first by a wide margin while barely clearing — or missing — the second.
A worked example
Take a 50-year-old with $1,000,000 saved, contributing $25,000 a year, planning to retire at 65, spending $5,000 a month in retirement with $2,500/month expected from Social Security at full retirement age. Run those numbers through a 1,000-scenario simulation and the calculator reports two figures: the median projected legacy in today's dollars (what that ending balance would actually buy, adjusted for inflation) and the median in nominal dollars (the raw number that will appear on an account statement decades from now, before adjusting for what inflation has done to it in the meantime).
| Lever | What changes | Effect on the median legacy |
|---|---|---|
| Lower monthly spending | Less drawn from the portfolio each year | Median legacy rises — spending and legacy sit on opposite ends of the same dial |
| Later retirement age | More years of contributions, fewer years of withdrawals | Median legacy rises, often substantially — time is doing double duty here |
| Adverse early sequence | Same average return, bad years land first | Median legacy falls — sometimes sharply — even in runs where the plan still "succeeds" |
The nominal figure will typically look much larger than the today's-dollars figure for anyone decades from retirement — that's inflation doing exactly what it does over a long horizon, not a sign the plan grew unusually well. The today's-dollars number is the one that actually tells you what that legacy will be able to buy.
What this doesn't capture
A simulated median legacy is a projection built from historically-plausible market ranges, not a forecast of the one specific future that's actually going to happen. It doesn't know about estate taxes in your specific state, the cost basis and step-up rules that apply to your specific accounts, how a will or trust structure will actually distribute what's left, or a health event, long-term-care cost, or family circumstance that reshapes spending well before the end. Those live in estate law and financial planning, not in a portfolio simulation — this tool tells you what the portfolio itself is likely to leave, not how it gets divided or taxed on the way out. Treat the number as a strong, honest estimate of the pool available, not the final word on what heirs receive.
How this is calculated
The figures above come from a 1,000-scenario Monte Carlo simulation using randomized market returns based on historical data, run against your savings, contributions, spending, retirement age, and Social Security inputs, and reported both in today's dollars and in nominal dollars. It's the same engine behind the full app — free to run, no account required. The complete math, including the specific assumptions and data sources, is documented in the trust framework.
Common questions
This article runs one calculator on default numbers. The full app models your complete plan — taxes, Social Security optimization, and stress-testing against real market history.
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