TIPS ladder or the 4% rule: which is safer for a 30-year retirement?
For the 30 years it covers, the TIPS ladder is the safer instrument — and it is safe in a narrower sense than it sounds. At an illustrative 2.0% real yield, a 30-year ladder pays $44,650 of inflation-indexed income per $1,000,000, and $895,858 locks in $40,000 real for all 30 years on every market path, leaving $104,142 of a $1M portfolio for equities ($960,634 and $837,212 at 1.5% and 2.5%). The 4% rule on the same $1M, 60/40, 30-year plan runs out of money in 9.2%–21.5% of 10,000 simulated paths under the five mainstream forecasts in our stress test, and in 97.5% under the mean-reverting outlier — but its surviving paths keep a median $339,503–$766,828 at year 30, which the ladder never does. The ladder’s exposure is year 31 and whatever the residual becomes; the 4% rule’s exposure is the order of returns inside the 30 years.
Key numbers
| Figure | 1.5% real | 2.0% real | 2.5% real | Source |
|---|---|---|---|---|
| TIPS ladder income per $1M, 30 years | $41,639/yr | $44,650/yr | $47,778/yr | computed here (illustrative yields) |
| Capital to lock $40,000 real for 30 years | $960,634 | $895,858 | $837,212 | computed here |
| Residual for equities out of $1M | $39,366 | $104,142 | $162,788 | computed here |
| 4% rule: share of paths that run out in 30 years | 9.2%–21.5% across five forecasts; 97.5% under GMO | quoted: Does the 4% rule survive forward-looking forecasts? Six CMEs stress-tested | ||
| 4% rule: median wealth left at year 30 | $339,503–$766,828 across five forecasts; $0 under GMO | quoted: Does the 4% rule survive forward-looking forecasts? Six CMEs stress-tested | ||
| 4% rule: failure when the first decade is in the worst tenth | 45.6% (pooled 6.0%; best tenth 0.0%) | quoted: Retiring into a bear market: same plan, 46% failure vs 0% | ||
| 4% rule: historical 30-year survival | 95.9% of 123 start years (worst: 1966, max 3.69%) | quoted: The 4% rule across 123 historical retirement cohorts | ||
Run the $1M / $40,000 / 30-year plan in the free planner →
Opens the Monte Carlo planner prefilled with the plan the quoted stress test simulates — retire at 65, plan to 95, $1,000,000, $40,000 a year, 45/15/40 US equity/international/bonds — so you can change the numbers and see the 4%-rule side for your own plan.
Two different promises
The question sounds like a contest between two withdrawal rates, but the two things being compared are not the same kind of object. A TIPS ladder is a set of Treasury Inflation-Protected Securities bought so that one issue matures in each of the next 30 years; each year’s maturing principal (plus that year’s coupons) is the income. Because TIPS principal is indexed to CPI-U, the income is set in today’s dollars, and because it is a Treasury obligation held to maturity, there is no market path on which the income fails to arrive. What you buy is a level real annuity with a hard stop at year 30 and no residual.
The 4% rule keeps the whole portfolio invested and draws 4% of the starting balance, raised for inflation each year. The income target is the same $40,000 on $1,000,000, but it is a plan, not a contract: whether the portfolio lasts 30 years depends on the sequence of returns it meets, and whatever is left at year 30 belongs to the retiree or the estate. The two failure modes are mirror images, and the numbers below keep them visible side by side.
The ladder, priced at three illustrative real yields
A ladder that pays a level real income for 30 years is a level real annuity, and its price per dollar of annual income is the ordinary-annuity factor a(r, 30) = (1 − (1 + r)−30) / r at the real yield r locked in across all rungs. Three flat real yields bracket the range TIPS have traded in during recent years; they are stated as assumptions, not quoted from any market, and the arithmetic reproduces from the yield alone. Income is drawn at the end of each year (the first rung matures a year after purchase). The last column is what the equities residual would have to earn, in real terms, to re-buy the same $40,000 ladder at year 30 — a required rate, not a forecast.
| Real yield | Annuity factor | Income per $1M | Cost per $1 of real income | Capital to lock $40,000 real, 30 yrs | Residual for equities | Residual growth needed to re-buy ladder at yr 30 |
|---|---|---|---|---|---|---|
| 1.5% | 24.016 | $41,639 | $24.02 | $960,634 | $39,366 (3.9%) | 11.2%/yr |
| 2.0% | 22.396 | $44,650 | $22.40 | $895,858 | $104,142 (10.4%) | 7.4%/yr |
| 2.5% | 20.930 | $47,778 | $20.93 | $837,212 | $162,788 (16.3%) | 5.6%/yr |
Two things stand out. First, the ladder’s income per $1M sits above $40,000 at every yield case here — $41,639 at 1.5%, $47,778 at 2.5% — because a ladder spends its principal down to zero by design, where the 4% rule is trying to spend only part of it. Second, the yield matters a great deal for how much is left over: locking $40,000 takes $960,634 at 1.5% but only $837,212 at 2.5%, so the residual for equities swings from $39,366 (3.9% of the portfolio) to $162,788 (16.3%). A one-point move in real yields is worth roughly $123,422 of capital on this plan.
The 4% rule, as we measured it
None of the figures in this section are new. They are quoted from three QuantCalc studies that simulate the identical plan — $1,000,000, 60/40, $40,000 a year raised for inflation, 30 years, no other income — and are linked so the full method and the open data can be read at the source.
Forward-looking forecasts: Does the 4% rule survive forward-looking forecasts? Six CMEs stress-tested
That study runs the plan 10,000 times under each of six published capital-market forecasts, holding volatility and correlations constant so that only the return assumption varies. Its 30-year results:
| Forecast source | 30-yr success | Share of paths that ran out | Paths that ran out | Median wealth at yr 30 | p10 … p90 at yr 30 |
|---|---|---|---|---|---|
| Charles Schwab | 90.8% | 9.2% | 915 of 10,000 | $691,352 | $17,751 … $1,928,560 |
| J.P. Morgan | 85.6% | 14.4% | 1,444 of 10,000 | $766,828 | $0 … $2,708,856 |
| Invesco | 85.4% | 14.6% | 1,465 of 10,000 | $498,086 | $0 … $1,564,214 |
| BlackRock | 84.4% | 15.6% | 1,563 of 10,000 | $471,499 | $0 … $1,513,260 |
| Vanguard | 78.5% | 21.5% | 2,154 of 10,000 | $339,503 | $0 … $1,261,060 |
| GMO (mean-reverting outlier) | 2.5% | 97.5% | 9,754 of 10,000 | $0 | $0 … $0 |
Timing luck: Retiring into a bear market: same plan, 46% failure vs 0%
That study resamples the 1928–2024 record in 5-year blocks, 50,000 times, and sorts the paths by what the first decade looked like. Pooled across all paths the plan fails 6.0% of the time with a median $1,823,819 left in real terms; when the first decade lands in the worst tenth of markets the failure rate is 45.6% and the median remainder $49,522; in the best tenth it is 0.0% with a median $5,355,467. The number to carry into the comparison is that the 4% rule’s risk is concentrated in the opening decade — exactly the decade a ladder makes irrelevant.
What actually happened: The 4% rule across 123 historical retirement cohorts
Across 123 real 30-year start years (1871–1993) on a 60/40 portfolio, a constant 4% real withdrawal lasted the full 30 years in 95.9% of cohorts; the median cohort could have sustained 6.15%, and the hardest (1966) only 3.69%. History was kinder to 4% than the forward-looking forecasts are, and the gap between 4.1% historical shortfalls and 9.2%–21.5% forecast shortfalls is itself part of the answer: the safety of the 4% rule is an estimate that moves with the return assumption, and the safety of the ladder is not.
Side by side
Each row is one way to deploy the same $1,000,000 toward the same $40,000-a-year real target for 30 years. The ladder rows and the hybrid rows are this study’s arithmetic; the 4%-rule row is quoted. The hybrid puts only the essentials on the ladder and leaves the residual at market.
| Strategy | Income, years 1–30 | Capital committed | Exposed to markets | Shortfall risk inside 30 years | What is left at year 30 |
|---|---|---|---|---|---|
| 30-year TIPS ladder, all-in illustrative 1.5% real yield | $41,639 real, years 1–30 | $1,000,000 | $0 | None for 30 years (held to maturity) | $0 — nothing at year 31 |
| 30-year TIPS ladder, all-in illustrative 2.0% real yield | $44,650 real, years 1–30 | $1,000,000 | $0 | None for 30 years (held to maturity) | $0 — nothing at year 31 |
| 30-year TIPS ladder, all-in illustrative 2.5% real yield | $47,778 real, years 1–30 | $1,000,000 | $0 | None for 30 years (held to maturity) | $0 — nothing at year 31 |
| 4% rule, 60/40 quoted: Does the 4% rule survive forward-looking forecasts? Six CMEs stress-tested | $40,000 real, planned | $1,000,000 | all $1,000,000 at market | 9.2%–21.5% of paths run out (five forecasts); 97.5% under GMO | median $339,503–$766,828 (five forecasts); $0 under GMO |
| Hybrid: ladder for the $40,000 essentials + equities residual illustrative 1.5% real yield | $40,000 real locked, years 1–30, plus whatever the residual yields | $960,634 in the ladder | $39,366 at market | None on the $40,000 for 30 years; the residual carries all the market risk | the residual’s outcome (not simulated here); needs 11.2%/yr real to re-buy the ladder at year 30 |
| Hybrid: ladder for the $40,000 essentials + equities residual illustrative 2.0% real yield | $40,000 real locked, years 1–30, plus whatever the residual yields | $895,858 in the ladder | $104,142 at market | None on the $40,000 for 30 years; the residual carries all the market risk | the residual’s outcome (not simulated here); needs 7.4%/yr real to re-buy the ladder at year 30 |
| Hybrid: ladder for the $40,000 essentials + equities residual illustrative 2.5% real yield | $40,000 real locked, years 1–30, plus whatever the residual yields | $837,212 in the ladder | $162,788 at market | None on the $40,000 for 30 years; the residual carries all the market risk | the residual’s outcome (not simulated here); needs 5.6%/yr real to re-buy the ladder at year 30 |
The two failure modes, in plain words
How the ladder fails
It does not run out inside the 30 years — that is the whole point, and it holds on every path a Monte Carlo could draw. It fails in two other ways. It has no upside: a decade of strong markets leaves the ladder holder exactly where a decade of weak markets would, because the income was set on the purchase date. And it stops: the last rung matures in year 30, and year 31 is funded by nothing unless the residual was invested and has grown. At 2.0% the residual is $104,142; to re-buy the same ladder at year 30 it would have to compound at 7.4% a year in real terms for 30 years (11.2% at 1.5%, 5.6% at 2.5%). A retiree who lives past the horizon, or who wants to leave something, has to get that from somewhere other than the ladder.
How the 4% rule fails
It can run out before year 30 — in 9.2%–21.5% of paths under the five mainstream forecasts quoted above, 97.5% under the mean-reverting one, 6.0% pooled across resampled history and 45.6% when the first decade is in the worst tenth. When it does not fail, it usually leaves a good deal behind: a median $339,503–$766,828 at year 30 under the five forecasts, and a median $1,823,819 in real terms across the pooled historical resamples. It keeps the upside, it keeps a bequest in most paths, and it keeps paying past year 30 in any path that has money left. Its risk is not a wall at the horizon but a slope inside it, steepest in the first ten years.
What “safer” means here. If safety means the $40,000 arrives in every one of the next 30 years, the ladder is safer, full stop, on any return assumption. If safety includes year 31 and beyond, or the size of what is left, the ladder is not safe at all — it is certain to leave nothing — and the comparison becomes the residual’s market outcome against the 4% rule’s. That second comparison is not made on this page, because it would require a simulation of the residual, and this study re-simulates nothing.
What it means
- The ladder buys certainty for 30 years and nothing after. At 2.0% real, $895,858 locks $40,000 real per year on every market path; the trade is a guaranteed $0 at year 31 from that capital.
- The 4% rule is a bet with a quoted price. 9.2%–21.5% of paths run out under five mainstream forecasts and 97.5% under the outlier, against a median $339,503–$766,828 left at year 30 when it works. The failure share is a modeled estimate and moves with the forecast; the ladder’s does not.
- Real yields decide how much is left for the hybrid. The residual for equities runs from $39,366 at 1.5% to $162,788 at 2.5%; at a real yield below 1.22% the $1M does not cover the ladder at all.
- The hybrid moves the risk rather than removing it. Essentials are safe for 30 years; the residual carries all the upside, all the market risk and the entire year-31 problem. Whether that residual is enough is a Monte Carlo question this page does not answer.
- Match the horizon to the risk you can bear. A retiree who cannot tolerate a shortfall in the next 30 years has a closed-form answer; a retiree who expects to live past the horizon, or to leave an estate, is choosing how much of the 4% rule’s upside to give up for how many years of certainty.
CC-BY-4.0 — free for any use including republication and journalism, with attribution to QuantCalc Research.
See the 4%-rule side for your own numbers
The stress test quoted here simulates one canonical plan. The free Monte Carlo planner runs the same forward-looking forecast sources and the same 30-year test on your balance, allocation and spending — no signup — so you can see how much of your income you would want on a ladder and how much you would leave at market.
Open the free planner →Methodology
Ladder arithmetic. A 30-year TIPS ladder that pays a level real income is modeled as a level real annuity: income per dollar of capital is 1 / a(r, 30) with a(r, n) = (1 − (1 + r)−n) / r, r the flat real yield locked in on every rung and income drawn at the end of each year 1–30. The capital that locks in $40,000 is $40,000 × a(r, 30); the residual is $1,000,000 minus that. The required residual growth is (capital ÷ residual)1/30 − 1. The break-even yield solves a(r, 30) = 25 by bisection. An annuity-due variant (first rung drawn on the purchase date) multiplies the factor by (1 + r); it is carried in the dataset as a sensitivity: income per $1M of $41,024 / $43,774 / $46,612 and a $40,000 cost of $975,043 / $913,775 / $858,142 at 1.5% / 2.0% / 2.5%.
Verification. Before anything is written the generator asserts, for every yield case, that income × factor returns the capital exactly, that an independent 30-step amortisation (balance grows at r, pays the income, repeated 30 times) ends within one cent of $0 for both the $1M ladder and the $40,000 ladder, that capital plus residual equals $1,000,000, that income rises and cost falls with yield, that the annuity-due variant pays less and costs more, that the required growth rate reproduces the ladder cost, that the 0% floor equals $1,000,000 ÷ 30, and that the break-even yield reproduces a factor of 25. Any failure stops publication.
Quoted 4%-rule figures. Read directly from the published datasets beside the linked studies — the stress test’s data.json (30-year success rate and terminal-wealth percentiles per forecast source; the failure share is 1 − success and the path count is that share of 10,000), the sequence-of-returns summary.json (pooled and first-decade-decile failure rates and median real terminal wealth) and the cohort study’s summary.json (share of 123 cohorts in which 4% lasted 30 years). The generator checks that each quoted dataset describes the $1,000,000 / $40,000 / 30-year plan, that every probability is in range and every percentile ordered, and that the outlier source is the lowest, before quoting. Nothing on the 4% side is simulated by this page.
Reproducibility. The ladder side reproduces from the three yields and the formula above with no data inputs at all; the quoted side reproduces from the linked open datasets. The CSV/JSON beside this page and every figure in the text are written in one pass, so they cannot disagree.
Assumptions and limitations
- Illustrative yields, not quotes. 1.5%, 2.0%, 2.5% are flat real yields chosen to bracket a plausible range; real TIPS yields differ by maturity, move daily, and a ladder bought on any given day locks in a curve, not a single number. Re-run the arithmetic with the yields available when you buy.
- Frictions ignored. No bid-ask spread, no commissions or fund expenses, no reinvestment of coupons between rungs, no rounding to the face amounts actually available. Each of these lowers the income slightly relative to the closed form.
- Maturity gaps. At any given time some target years may have no outstanding TIPS issue; a real ladder bridges those years with adjacent maturities, which changes the exact rung amounts.
- Taxes. In a taxable account the inflation adjustment to TIPS principal is taxed as it accrues, before the cash arrives; in a tax-deferred account it is not. The 4%-rule studies quoted here are also pre-tax. Neither side of this page is after tax.
- Credit and indexation. “No shortfall risk” means no market-path risk on a Treasury obligation held to maturity indexed to CPI-U; it does not mean CPI-U matches any particular retiree’s own cost of living.
- The 4%-rule figures are model outputs. They depend on the forecast source, the sampling method and the 60/40 allocation stated in each quoted study, and they are nominal or real as each study reports them (nominal in the stress test, real in the sequence-of-returns study). They are not a prediction.
- The hybrid’s residual is not simulated. This page states what the residual would need to earn to re-buy the ladder; it makes no claim about how likely that is.
- Not advice. Educational research on two ways to fund a level real income; not financial, tax or legal advice, and not a recommendation to buy any security.
Frequently asked questions
Which is safer for 30 years, a TIPS ladder or the 4% rule?
For the 30 years it covers, the ladder. A 30-year TIPS ladder held to maturity delivers its inflation-indexed income on every market path; at an illustrative 2.0% real yield, $895,858 locks in $40,000 a year in today's dollars for 30 years. The 4% rule on the same $1M, 60/40, 30-year plan ran out of money in 9.2% to 21.5% of 10,000 simulated paths under the five mainstream forecasts in QuantCalc's stress test, and in 97.5% under the mean-reverting outlier. What the ladder gives up is upside: it ends at $0 in year 31 by design, while the surviving 4%-rule paths keep a median $339,503 to $766,828 at year 30.
How much does a 30-year TIPS ladder pay per $1 million?
It depends on the real yield locked in. At a flat illustrative real yield of 1.5%, $1,000,000 buys about $41,639 of inflation-indexed income a year for 30 years; at 2.0%, about $44,650; at 2.5%, about $47,778. At a 0% real yield the ladder is just the capital divided by 30, $33,333 a year. These are level-real-annuity figures with income drawn at the end of each year, not market quotes.
How much capital does it take to lock in $40,000 a year, inflation-adjusted, for 30 years?
$960,634 at a 1.5% real yield, $895,858 at 2.0%, and $837,212 at 2.5%. Out of a $1,000,000 portfolio that leaves $39,366, $104,142 and $162,788 respectively for equities. Below a real yield of about 1.22%, $1,000,000 is not enough to lock in $40,000 for 30 years at all.
What is the TIPS ladder's failure mode if it never runs out?
Two things. First, it has no upside: the income is set in real terms, so a strong market decade leaves the ladder holder exactly where a weak one would. Second, it stops. A 30-year ladder pays its last rung in year 30 and has nothing for year 31 unless the residual was invested and has grown enough to fund the years beyond, or the retiree accepts that year 31 is outside the plan. The 4% rule has the opposite profile: it can fail inside the 30 years, but its surviving paths carry a balance past them.
Does the hybrid, a ladder for essentials plus equities for the rest, get the best of both?
It separates the two risks rather than removing them. The $40,000 of essentials is locked for 30 years on every path, so the shortfall risk the 4% rule carries on that income is gone. The residual, $104,142 at a 2.0% real yield, carries all the market risk and all the upside, and is also the only money available for year 31 onward; to re-buy the same ladder at year 30 it would have to grow about 7.4% a year in real terms. This study does not simulate the residual, so it makes no claim about how often it gets there.
Are the 4%-rule failure rates here new simulations?
No. Every 4%-rule figure on this page is quoted from QuantCalc's published Monte Carlo studies with a link: the forward-looking stress test (success by forecast source, terminal wealth), the sequence-of-returns study (a pooled 6.0% failure rate that rises to 45.6% when the first decade lands in the worst tenth of markets) and the historical-cohort study (4% lasted 30 years in 95.9% of 123 start years). This page adds the ladder arithmetic and the comparison; it re-runs nothing.
Related research
Changelog
- v2026.1 (2026-09-06) — initial release. Three illustrative real-yield cases (1.5%, 2.0%, 2.5%), closed-form ladder pricing with 30-step amortisation checks, annuity-due sensitivity and break-even yield; 4%-rule figures quoted from three published QuantCalc studies.
Last updated 2026-09-06. Dataset license: CC-BY-4.0. QuantCalc is an independent retirement-planning research project. Not affiliated with, endorsed by, or sponsored by the U.S. Treasury or any referenced firm including BlackRock, J.P. Morgan, Vanguard, GMO, Schwab or Invesco; forecast names identify the published capital-market assumptions quoted in the linked study, and all trademarks belong to their respective owners. Educational research, not financial, tax, or legal advice.
Cite this research study
QuantCalc Research (2026). TIPS Ladder vs the 4 Percent Rule: Locked-In Real Income or Market Upside for 30 Years (2026). https://quantcalc.app/research/tips-ladder-vs-4-percent-rule-2026/ (accessed <date>).
BibTeX
@misc{quantcalc2026tipsladdervsthe4percentrulelockedinreali,
title = {TIPS Ladder vs the 4 Percent Rule: Locked-In Real Income or Market Upside for 30 Years (2026)},
author = {{QuantCalc Research}},
year = {2026},
url = {https://quantcalc.app/research/tips-ladder-vs-4-percent-rule-2026/},
note = {Accessed <date>}
}Machine-readable citation metadata (schema.org identifier and citation fields) is embedded in this page's JSON-LD, at the stable identifier https://quantcalc.app/research/tips-ladder-vs-4-percent-rule-2026/.