Retirement Spend-Down Calculator: How to Plan Your Withdrawals

A retirement spend-down calculator tells you how long your savings will last based on your balance, expected annual withdrawals, and investment return assumptions. The most important number is your annual withdrawal rate — keeping it at or below 4% of your starting portfolio is the widely cited benchmark for a 30-year retirement.

What Is a Retirement Spend-Down Strategy?

A retirement spend-down strategy is the plan for converting your accumulated retirement savings — in 401(k)s, IRAs, brokerage accounts, or pension lump sums — into regular income that lasts as long as you live. The key challenge: you don't know how long that will be.

Unlike the accumulation phase of retirement saving, where the goal is simply to grow the balance, the spend-down phase requires balancing three competing forces:

• Longevity risk — spending too cautiously and dying with a large unused balance
• Sequence risk — encountering a major market downturn in the early years of retirement when the portfolio is at its largest
• Inflation risk — maintaining purchasing power over a retirement that might span 25–35 years

A spend-down calculator models these variables to project whether your specific combination of savings, spending, and investment returns will sustain your lifestyle. Most tools require: starting portfolio value, annual spending target, expected annual return, retirement duration, and inflation rate assumption.

Key calculators to use:
- Vanguard's Retirement Nest Egg Calculator (vanguard.com) — simple, reliable, models probability of success over multiple market scenarios
- FIRECalc (firecalc.com) — free, uses historical US market data from 1871 forward, shows what percentage of historical 30-year periods would have supported your withdrawal rate
- T. Rowe Price Retirement Income Calculator (troweprice.com) — includes Social Security income integration and taxes

How to Use a Retirement Spend-Down Calculator

Working through a spend-down calculation for the first time produces a more useful result when you input realistic numbers rather than optimistic ones.

Step 1: Establish your starting balance. Include all accounts you intend to draw from: 401(k)s, traditional IRAs, Roth IRAs (though Roth accounts have different tax treatment and RMD rules), and taxable brokerage accounts. Exclude home equity unless you plan to liquidate or take out a reverse mortgage.

Step 2: Set a realistic annual spending target. Most retirees spend 70–85% of their pre-retirement income in early retirement, declining gradually in later years. Separate your spending into essential needs (housing, healthcare, food) and discretionary (travel, entertainment) — this lets you quickly model what happens if discretionary spending needs to be cut.

Step 3: Choose a conservative return assumption. A 5–6% nominal annual return assumption is appropriate for a balanced portfolio (roughly 60% stocks, 40% bonds) in current projections. Avoid using the historical average of 10% for stocks alone — your actual portfolio contains bonds, and you are withdrawing regularly, which reduces the compounding effect.

Step 4: Adjust for inflation. Use a 3% annual inflation assumption for most scenarios. Healthcare costs for retirees often inflate faster (4–5% annually), so increase your healthcare spending line accordingly if it represents a significant share of your budget.

Step 5: Run multiple scenarios. The most revealing exercise is testing what happens in a "bad sequence" scenario — a 30% market drop in year one or two of retirement. Calculators that run Monte Carlo simulations (randomized sequence of returns) or historical scenario testing show the full distribution of outcomes, not just the median.

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The 4% Rule: What It Means and Its Limitations

The 4% rule originated from a 1994 study by financial planner William Bengen, who analyzed historical US market returns from 1926 onward and found that a 4% initial withdrawal rate, adjusted annually for inflation, had historically sustained a 30-year retirement without depleting the portfolio. The research was subsequently validated by the "Trinity Study" (Cooley, Hubbard, and Walz, 1998), which showed a 95%+ historical success rate for 50/50 to 75/25 stock-to-bond portfolios at a 4% withdrawal rate over 30 years.

In practice, the 4% rule has important caveats in 2026:

Starting balance matters more than the percentage. On a $1 million portfolio, 4% = $40,000 per year. Whether that covers your actual spending is a separate question from whether the math works.

Roth IRAs are excluded from Required Minimum Distributions (RMDs). Traditional IRA and 401(k) holders must begin taking Required Minimum Distributions at age 73 (under the SECURE 2.0 Act). These RMDs may force withdrawals larger than 4% of the account balance, creating a tax event and spending floor that's outside your control. A good spend-down calculator models RMDs explicitly.

A 30-year horizon assumes retirement at 65. If you retire at 55 or live past 95, a 4% rate carries more risk. Reducing the initial withdrawal rate to 3–3.5% meaningfully improves longevity probabilities for longer horizons.

According to Morningstar's 2023 State of Retirement Income report, the "safe withdrawal rate" for a 90% success probability over 30 years using a moderate portfolio was 3.8%, slightly below the traditional 4% benchmark — reflecting higher starting valuations than in historical test periods. (Morningstar, State of Retirement Income 2023, morningstar.com, accessed 2026.)

Also Read: Shop personal finance calculators and retirement planning tools on Amazon

Medicaid Spend-Down: A Different Type of Spend-Down

The term "spend-down" also appears in a completely different context: Medicaid eligibility for nursing home or long-term care coverage. Medicaid requires applicants to spend most of their assets down to a very low threshold ($2,000 in countable assets in most states) before Medicaid begins paying for nursing home care.

This process — deliberately spending savings on allowable medical and care costs to reach Medicaid's asset limit — is called a Medicaid spend-down. It is a legitimate and common strategy for middle-class families who cannot afford nursing home costs ($8,000–$12,000+ per month) out of pocket.

Key distinctions from retirement spend-down:
- The goal is asset reduction, not income generation. You are spending down to qualify for a benefit, not to fund your own lifestyle.
- Medicaid's 5-year look-back rule applies. Medicaid reviews asset transfers made within the 60 months before your application. Improper gifts or transfers during this window create a penalty period. See: What Expenses Qualify for Medicaid Spend Down?
- An irrevocable trust can exempt assets. Assets transferred to certain irrevocable trusts before the 5-year look-back window can be sheltered from Medicaid's asset count. See: Medicaid Asset Protection Trust: How It Works

For Medicaid spend-down planning, consult an elder law attorney — the rules are state-specific and the penalties for incorrect transfers are significant.

Also see: Cost of a Home Nurse in 2026: Rates, Medicare & Medicaid.

Reviewed and Updated on July 2, 2026 by George Wright