Variable Percentage Withdrawal (VPW) for Early Retirement

The Variable Percentage Withdrawal method — developed on the Bogleheads forums and formalized in a collaborative wiki spreadsheet — solves the core structural problem with static safe withdrawal rates: the rate doesn't respond to what the market is actually doing.¹ VPW uses the standard PMT (present-value annuity) formula, recalculated each year with the actual current portfolio value and remaining horizon, to produce a withdrawal amount that automatically adjusts when returns are above or below plan.

The result: VPW cannot fail in the same way a static SWR can. If markets crater in year 3, VPW cuts your withdrawal; if they boom, VPW raises it. The portfolio always lasts to your planning end age — because each year's withdrawal is sized to deplete exactly whatever remains over the remaining years at your assumed rate.

The trade-off is real: spending is variable. Early retirees who need a fixed income floor — a non-negotiable mortgage, for example — should cover that floor with guaranteed income (Social Security, annuity, pension) and use VPW only for discretionary spending. But for retirees with genuine flexibility, VPW typically allows higher starting spending than the static 4% rule while making portfolio failure mathematically impossible.

How the VPW formula works

Each year you apply the PMT formula to your current portfolio:

This is identical to the Excel PMT function. The formula answers: "What fixed annual payment draws down this present value to zero in exactly n years at interest rate r?" The key to VPW is that you don't fix the payment — you recalculate it every year with the real portfolio value. So if the portfolio is $1.8M when you expected $2.0M (a bad sequence), the withdrawal automatically shrinks. If it's $2.3M (a good sequence), the withdrawal rises accordingly.

VPW calculator

Enter your retirement parameters to see your Year 1 VPW withdrawal, how it compares to the static SWR and Guyton-Klinger methods, and a 10-year projection under three return scenarios.

VPW withdrawal rates by age and return assumption

These are the PMT_factor percentages — the fraction of your portfolio VPW withdraws in Year 1 — for common retirement ages and real return assumptions, assuming a 90-year planning end age. Because VPW depletes the portfolio to zero by the end age (by design), these rates are higher than static SWR rates for the same horizon.¹

VPW percentages computed via PMT formula with planning end age = 90. Static SWR rates from Bengen/Pfau historical success research consistent with the SWR calculator on this site. VPW rates are higher because the method is designed to fully deplete the portfolio by the planning end age, treating the entire portfolio as available for spending over the horizon.

The critical trade-off: depletion vs. estate

The most important thing to understand about VPW is that it is designed to draw the portfolio to zero at the planning end age under the assumed return. This is not a failure mode — it is the feature. The PMT formula is a cash-flow annuitization: you're converting the portfolio into a self-managed income stream rather than leaving any of it as an estate or buffer.

In practice, the portfolio rarely hits exactly zero at the plan end age because returns deviate from the assumed rate. In good sequences, the portfolio at age 90 is substantial. In bad sequences, VPW's self-adjusting withdrawals protect the portfolio by cutting spending. But the design intent is full depletion — and that's why starting rates are higher than SWR.

VPW vs. static SWR vs. Guyton-Klinger: what each solves

Integrating VPW with an income floor

The standard way to implement VPW in early retirement is to pair it with a guaranteed income floor that covers non-discretionary expenses:

1. Identify your non-negotiable floor. Rent or mortgage, food, insurance, utilities — spending that cannot be reduced regardless of market conditions. For most early retirees, this is $24,000–$45,000/year.
2. Fund the floor with guaranteed income. For early retirees, the floor is initially funded entirely from the portfolio (pension, Social Security, or annuity income typically starts later). This is the Bucket 1 function: a 1–3 year cash cushion that insulates the floor from sequence-of-returns damage. See the bucket strategy guide for sizing.
3. Apply VPW to the remaining portfolio for discretionary spending. Travel, restaurants, home renovations, gifts — spending that genuinely varies. The VPW withdrawal from your total portfolio, minus the floor funded from Bucket 1, equals your discretionary budget each year.
4. As Social Security and guaranteed income begin, redirect the floor funding. When SS begins at 67–70, those payments replace what the portfolio was funding for the floor, and the VPW calculation continues on the portfolio that remains.

VPW and ACA/IRMAA coordination

VPW's variable withdrawals interact with early retirement's two key subsidy cliffs in opposite ways depending on which direction the market moves.

In good years: VPW raises withdrawals above ACA cliff

If your portfolio outperforms the assumed rate, VPW instructs you to withdraw more. For early retirees relying on ACA subsidies, this creates a planning problem: a 15–20% portfolio increase can push VPW's recommended withdrawal — and therefore your MAGI — above the 2026 ACA 400% FPL cliff (~$63,840 single, ~$86,640 MFJ). Solution: source the extra spending from MAGI-neutral accounts (Roth IRA distributions, qualified dividend/LTCG harvesting at 0% within the $49,450/$98,900 threshold) rather than from traditional IRA draws that increase ordinary income.

In bad years: VPW cuts protect ACA subsidy access

In a down-market year, VPW's withdrawal automatically falls. If the market drops 20% and your portfolio shrinks accordingly, VPW may reduce your recommended withdrawal to a level that keeps ordinary income below the ACA cliff — potentially unlocking subsidies at exactly the moment your portfolio is under stress. This is the scenario where VPW's self-adjustment is most valuable: a bad sequence simultaneously reduces your withdrawal and (if below the cliff) reduces your healthcare cost.

IRMAA lookback: watch ages 63–64

The 2-year lookback for Medicare IRMAA surcharges means income at ages 63–64 sets Part B premiums at 65. If VPW produces high withdrawals in those years (a good-sequence scenario), ordinary income from traditional IRA draws can push MAGI above the $109,000 single / $218,000 MFJ tier-1 threshold. At 63–64, deliberately source VPW's higher-than-expected withdrawal from Roth or 0% LTCG to keep IRMAA lookback income in check. See Withdrawal Order for the full framework.

Choosing a planning end age

The planning end age is the n in the VPW formula — and it's one of the most consequential inputs. A shorter end age (e.g., 85) produces higher initial withdrawals but risks outliving your plan. A longer end age (e.g., 100) is more conservative and produces lower withdrawals similar to a perpetual portfolio.

The Bogleheads VPW wiki recommends planning to age 90 as a reasonable default for most healthy retirees, paired with a deferred annuity (QLAC) to hedge extreme longevity beyond 90.¹ The QLAC guide covers how to use a $200,000 QLAC ($100K per spouse) from the 2026 SECURE 2.0 limit to provide longevity insurance starting at age 80 or later.

Spending volatility: how much can VPW drop?

The most honest way to evaluate VPW for your plan is to model what happens under a bad-sequence first decade. Using historical return sequences, an early retiree at age 50 with a $2M portfolio who experiences the worst 10-year real return sequence in US market history (approximately −0.5% annualized real, 1966–1975 pattern) would see:

• Year 1: $119,000 (5.95% × $2M)
• Year 5: ~$92,000 (portfolio down ~22% from sequence damage)
• Year 10: ~$75,000 (portfolio partially recovered; spending recovering)

That's a 37% spending cut from Year 1 to Year 10 in the worst historical sequence. Whether $75,000 is viable depends entirely on whether your floor spending is covered by income or cash reserves. If your minimum non-negotiable spending is $50,000 and you enter retirement with a 2-year cash buffer plus Social Security arriving at age 67, this is manageable. If your minimum spending is $90,000 with no flexibility, VPW is not the right primary method — the static SWR (sized conservatively at 3.5%) or a guaranteed income floor approach would be more appropriate.

When VPW makes sense for early retirees

1. You have substantial discretionary spending. Fat FIRE and chubby FIRE retirees with $100K–$200K/year spending have large discretionary portions that can flex. A 20% VPW-driven cut on $150K/year is $30K — painful but survivable. The same cut on a lean FIRE $35K/year budget is $7,000 — potentially housing-threatening.
2. You don't care about leaving an estate. VPW depletes the portfolio to zero by design. If a specific inheritance goal matters, use SWR or a lower VPW percentage.
3. You have a future income floor coming. Social Security at 67–70 dramatically reduces what the portfolio must provide. For an early retiree whose $30,000 SS benefit will cover 50% of floor spending starting at 67, VPW's variable withdrawal from the remaining portfolio is much safer — because SS absorbs any VPW-driven cut below the floor.
4. You want to avoid "dying rich" with unnecessary sacrifice. Static SWR at 3.5% on a $3M portfolio produces $105K/year — but historically leaves $3–6M unspent at death. VPW reclaims some of that capital as spending during your lifetime.