Retiring in October With $750,000? Here’s How Long $3,500 a Month Actually Lasts

Retiring in October with $750,000 and a plan to withdraw $3,500 a month is one of the most common situations in American retirement: a solid nest egg, a modest lifestyle and a nagging fear that the money runs out first. That fear is widespread. 51% of Americans think it is somewhat or very likely they will outlive their savings, according to the Northwestern Mutual 2025 Planning & Progress Study.

That same study estimated the retirement “magic number” at $1.26 million. At $750,000, every assumption carries more weight.

Your Return Assumption Decides How Long This Lasts

No reliable source produces a single lifespan for this exact portfolio and withdrawal combination. Any number of years you see elsewhere is simply the output of an assumed return, so treat it that way. This analysis anchors to one explicit benchmark: what low-risk money pays today. The 10-year Treasury yields about 5%, while the national average 12-month CD pays about 2%.

The mechanism is simple. When the portfolio earns more each year than you pull out, the balance holds. When it earns less, you spend principal, and the shortfall compounds as the balance shrinks. At the CD average, interest covers only a small slice of $3,500 a month. At Treasury-like yields, the gap narrows sharply. Shift the return assumption by a couple of percentage points and the answer moves by years in either direction.

A Rough First Three Years Can Break the Plan

Sequence-of-returns risk means the order of returns matters as much as the average. A deep decline right after you retire forces you to sell more shares at low prices to fund each $3,500 check. Those shares are gone before the recovery arrives. The identical decline a decade later does far less damage because the plan has already survived its fragile early stretch.

Bonds carry their own version of this risk. The 10-year yield sits above its one-year average of about 4%, and rising yields push down the market value of bonds you already own.

Inflation Turns a Flat $3,500 Into a Pay Cut

Core PCE, the Fed’s preferred inflation gauge, rose from 127 in September 2025 to 131 in July 2026, against a Fed target of 2%. A fixed withdrawal buys less every year. Raise it to keep pace, and the draw grows while the portfolio does not. Inflation ranked as the top retirement concern for 57% of workers in 2025 survey data.

4 Omissions That Distort the Picture Both Ways

1. Social Security: Benefits could replace a large share of the $3,500, cutting the portfolio draw. The 2027 cost-of-living adjustment is tracking toward 3%, which gives that income built-in inflation protection your portfolio lacks.
2. Taxes on pre-tax accounts: Traditional 401(k) and IRA withdrawals count as ordinary income, so $3,500 gross buys less than $3,500. The 2026 standard deduction of $16,100 for singles and $32,200 for joint filers covers part of it.
3. Healthcare before Medicare: Retiring before 65 means buying private coverage out of withdrawals. After enrollment, Part B alone runs about $203 a month in 2026, with a $283 deductible and a $1,736 Part A hospital deductible.
4. Home equity: This scenario misses a paid-off house as a reserve for late-life care or downsizing.

Leaving these out makes the picture incomplete in both directions. Social Security and home equity make things look worse than reality. Taxes and healthcare make things look better.

Two Paths, and Which One Most Retirees Should Take

Path one: fund every withdrawal from a stock-heavy portfolio and ride out whatever comes. This leaves you fully exposed to a bad opening sequence, and for most people at this asset level it is the worse choice.

Path two: build a Treasury or CD ladder covering the first several years of withdrawals, locking in today’s high yields, and leave the rest invested for growth. This shields the fragile early years and lets stocks recover before you sell them. For most retirees here, path two wins.

Verdict: Tight but Workable With Social Security

This plan is tight. It holds up if Social Security arrives to shrink the draw and a ladder absorbs the first few years of market risk. It wears down quickly without them.

First, pull your Social Security estimate at your likely claiming age and see how much of the $3,500 it replaces. That single figure moves this plan more than anything else. Second, avoid a frequent error: selling stocks for spending money during an early downturn (we walked through how to defend those fragile first years in a free guide here).

If most of the $750,000 sits in pre-tax accounts, a fee-only planner earns the fee. Roth conversions in low-income years can keep future income below the $109,000 single-filer threshold where Medicare premium surcharges begin.

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