Retirement Withdrawal Order Calculator: Which Accounts to Draw From First

Why Withdrawal Order Matters

A retired couple, both 67 with $40,000 of Social Security, who need $100,000 from their savings this year pays $9,884 of federal income tax if it all comes from a traditional IRA, and $0 if it comes from a Roth or from a taxable account whose shares cost 60% of today’s value (2026 law, QuantCalc’s federal engine). Over a whole retirement the order matters too: in QuantCalc’s withdrawal-order study the best-case household saves a median $16,836 of lifetime tax against drawing the traditional account first.

The reason is straightforward: different account types have different tax treatment. Traditional IRA withdrawals are taxed as ordinary income. Roth IRA withdrawals are completely tax-free. Taxable brokerage withdrawals involve a mix of return-of-basis (tax-free), long-term capital gains (0-20%), and dividends (0-20% qualified, or ordinary rates for non-qualified). The order in which you tap these accounts determines your Adjusted Gross Income (AGI) and Modified Adjusted Gross Income (MAGI) each year, which in turn determines your tax bracket, ACA subsidy eligibility, IRMAA surcharges, and Social Security taxation.

Most retirees follow the conventional wisdom without questioning it. That conventional wisdom was developed in an era before ACA subsidies existed, before IRMAA surcharges applied to most retirees, and before the interaction between Social Security taxation and other income was widely understood. The tax code in 2026 creates cliff effects and phase-ins that make the simple sequential approach suboptimal for most households.

The Conventional Wisdom Is Wrong

The standard advice from most financial advisors follows a strict sequence: spend taxable accounts first, then tax-deferred (traditional IRA/401k), then tax-free (Roth) last. The logic sounds reasonable — let tax-advantaged accounts compound as long as possible.

Here is why it fails in practice:

The RMD Time Bomb

If you drain your taxable account in your 60s while leaving your $800,000 traditional IRA untouched, that IRA grows to $1.2M+ by age 73, when Required Minimum Distributions begin for anyone born 1951–1959 (75 if you were born in 1960 or later). Your first RMD would be roughly $47,000 — and that amount increases every year as the divisor shrinks. Combined with Social Security benefits, this forces you into the 22% or 24% bracket for the rest of your life.

Meanwhile, in your early 60s, you may have had 8-10 years where your only income was capital gains from your taxable account, meaning you could have withdrawn from your traditional IRA at the 10% or 12% rate. Those low-bracket years are gone forever once RMDs push you higher.

The ACA Subsidy Cliff

For early retirees between 55 and 65, the conventional order is particularly costly. Traditional IRA withdrawals count as MAGI. If your MAGI exceeds 400% of the Federal Poverty Level ($84,600 for a couple in 2026), you lose ACA premium tax credits worth $15,000 to $22,000 per year. A MAGI-optimized strategy would draw from Roth and taxable cost basis to stay below the cliff, preserving those subsidies.

The IRMAA Bracket Trap

For retirees 65 and older, Medicare Part B and Part D premiums increase at specific MAGI thresholds. The first IRMAA bracket begins at $218,000 for married couples in 2026. Each bracket adds $2,300 to $12,000+ per year in surcharges. Traditional IRA withdrawals push MAGI higher; Roth withdrawals do not count toward IRMAA at all.

What Sequencing Is Actually Worth: Measured, Not Assumed

The figures below are not an illustration. They come from the withdrawal-order study, which now searches a set of whole-retirement withdrawal orders (plus Roth-conversion candidates) per household over the same 4,000 simulated market paths and recommends whichever has the lowest present value of lifetime tax — a saving that can never be negative, because traditional-first is itself always one of the candidates: the study's best-case household is recommended a paired median saving of $16,836 (band $7,675 to $29,004). The old single-year "lowest tax this year" rule is scored beside it as one more candidate and has no such guarantee — its own worst-case cost against traditional-first is a paired median of $52,157. Across nine households the single-year rule helped in 4, backfired in 4, and made no difference in 1. Spending is after tax — each year's withdrawal funds spending plus that year's tax bill, debited from the accounts drawn — so the study also reports each household's portfolio survival under the recommended order against traditional-first.

The pattern is consistent: bracket room in the low-income corridor before Social Security and required distributions is worth using, and the study's recommended orders use it; deep in the RMD years there is no room left, drawing traditional first is already the lowest-cost order, and a rule that minimizes this year's bill by reaching for Roth or taxable dollars costs the study's traditional-heavy California household (the RMD-straddle row above) a paired median of $14,364 over the plan.

What the calculator above can and cannot tell you. It prices one year, on today's balances, with no Roth conversions, no ACA subsidy modelling, and no RMDs. A single year is exactly the horizon on which the conventional order most often looks fine — and it will say so when it does, rather than rounding the answer up to zero. Whether sequencing pays over a whole retirement is a multi-year question, and the study above is where it is answered.

How Account Order Affects ACA Subsidies and IRMAA

The interaction between withdrawal order and healthcare costs is the single largest overlooked factor in retirement tax planning. For a couple in their late 50s or early 60s, healthcare costs are often the largest line item after housing — and the source of your retirement withdrawals directly controls what you pay.

ACA Premium Tax Credit Mechanics

ACA subsidies are calculated based on MAGI relative to the Federal Poverty Level (FPL). In 2026, the FPL for a household of 2 is $21,150. The 400% threshold — the cliff above which you lose all subsidies — is $84,600.

Here is what counts toward MAGI and what does not:

• Traditional IRA/401(k) withdrawals: 100% counts as MAGI
• Roth IRA withdrawals: Does NOT count as MAGI
• Taxable account — capital gains: Counts as MAGI (gains only, not cost basis)
• Taxable account — return of basis: Does NOT count as MAGI
• Social Security: All of it counts toward ACA MAGI — the untaxed part is added back (IRC §36B(d)(2)(B)); only the taxable part, at most 85%, counts toward the IRMAA MAGI
• Qualified dividends: Counts as MAGI

A couple needing $80,000 who draws entirely from a traditional IRA has $80,000 in MAGI — dangerously close to the $84,600 cliff. Add even modest dividends or capital gains and they lose $15,000+ in annual subsidies. The same couple drawing $40,000 from Roth and $40,000 from taxable cost basis has MAGI of only the capital-gains portion of the taxable withdrawal. That can be too low: below 138% of the poverty line ($29,187 for two in 2026) an expansion state moves them to Medicaid, and below 100% ($21,150) no premium tax credit is allowed at all, so a MAGI-aware plan fills income up to that floor rather than to zero.

IRMAA Threshold Interaction

Medicare IRMAA surcharges apply based on MAGI from two years prior (2026 premiums use 2024 MAGI). The 2026 thresholds for married filing jointly:

A large traditional IRA withdrawal or a one-time Roth conversion that pushes MAGI above $218,000 triggers surcharges two years later. MAGI-aware withdrawal ordering keeps distributions just below these thresholds, scheduling larger withdrawals in years where IRMAA impact is minimized (for example, the year you turn 63 affects premiums at age 65 — your first year on Medicare).

2026 Federal Income Tax Brackets (Married Filing Jointly)

Withdrawal order optimization requires filling the lowest brackets first. Here are the 2026 MFJ brackets after the $32,200 standard deduction:

The key insight: the jump from 12% to 22% is the largest marginal rate increase in the bracket schedule (83% increase in rate). Filling the 12% bracket with traditional IRA withdrawals and covering remaining spending from Roth or taxable cost basis is the cornerstone of most tax-efficient withdrawal strategies. For a couple with $30,000 in Social Security, you can withdraw roughly $107,500 from your traditional IRA while both of you are under 65 (about $122,800 once both are 65 or older and the age-65 and senior deductions apply) and still stay in the 12% bracket — at that income 85% of the benefit, $25,500, is taxable too. Any long-term gains realized on top then sit above the 0% band and are taxed at 15%, so taxable-account withdrawals in that year should realize as little gain as possible.

Roth Conversion Ladder Integration

Withdrawal ordering and Roth conversion strategy are two sides of the same coin. In years where your spending needs are met by taxable account withdrawals and Social Security, leftover space in the 12% bracket represents a Roth conversion opportunity.

The Bracket-Fill Conversion Strategy

Suppose a couple in their early 60s needs $80,000/year and has $2,500 a month in Social Security. They draw $54,500 from their taxable brokerage, of which $20,000 is long-term gain. Their provisional income is $35,000 ($20,000 plus half the benefit), so only $1,500 of the benefit is taxable and their AGI is $21,500 — below their $32,200 standard deduction, so they owe no federal income tax and the 10% and 12% brackets sit empty.

Rather than leaving that space empty, they can convert $81,500 from their traditional IRA to Roth. The conversion makes 85% of the benefit taxable ($25,500) and lifts AGI to $127,000, but taxable income — $94,800 including the gain — stays inside the 12% bracket and under the $98,900 top of the 0% capital-gains band, so the gain is still untaxed. The federal tax on the conversion is $8,480, 10.4% of the amount converted. (On marketplace coverage a conversion this size would also cross the $84,600 ACA cliff; there the cliff, not the bracket, sets the ceiling.) This simultaneously:

• Reduces future RMDs (smaller traditional IRA balance)
• Moves money to a tax-free account (Roth grows without future tax)
• Fills a bracket that would otherwise go unused
• Creates seasoned Roth funds available penalty-free in 5 years

QuantCalc's Tax-Aware Mode integrates these conversion opportunities automatically. It searches a set of whole-retirement withdrawal-order-plus-conversion policies — each one a bracket-fill rule applied consistently across the plan, not re-optimized year by year — and recommends whichever has the lowest present value of lifetime tax, accounting for account balances, tax brackets, and IRMAA thresholds across the full retirement horizon.

Why Conversions Shrink on Their Own in High-Income Years

Not every year is a good conversion year. In years where Social Security benefits begin (increasing MAGI), where one-time capital gains events occur (home sale, inheritance), or where a spouse's pension starts, the available bracket space shrinks. A bracket-fill rule handles this without being re-optimized each year: the conversion amount is whatever room is left under the target bracket once that year's other income is counted, so it automatically shrinks or disappears in a high-income year and widens again in a low-income one. Whether converting at all is worth it over the whole retirement — against simply drawing traditional first — is what the whole-retirement search decides, and it never recommends a conversion policy that leaves the household worse off than the alternative it is scored against.

Social Security Taxation and Withdrawal Order

Social Security benefits are taxed based on "provisional income" — AGI plus tax-exempt interest plus half of Social Security benefits. If provisional income exceeds $44,000 for a married couple, up to 85% of benefits become taxable. This creates a hidden marginal rate: each additional dollar of traditional IRA withdrawal can cause $0.85 of Social Security to become taxable, effectively increasing your marginal rate by 10-15 percentage points.

This is the Social Security tax torpedo. Above $44,000 of provisional income (MFJ), until 85% of the benefit is taxable, each extra dollar adds $1.85 of taxable income — an effective marginal rate of 22.2% in the 12% bracket and 40.7% in the 22% bracket. Withdrawal ordering that avoids this range — by substituting Roth withdrawals for traditional IRA withdrawals when provisional income is in the torpedo zone — can save thousands per year.

What is the best order to withdraw from retirement accounts?

The conventional advice is taxable first, then traditional (tax-deferred), then Roth. However, the optimal order depends on your tax bracket, ACA subsidy eligibility, IRMAA thresholds, Social Security taxation, and future RMD projections. For many early retirees, strategically mixing withdrawals from multiple account types in the same year produces lower lifetime taxes than a strict sequential order.

Why is the conventional withdrawal order often wrong?

The conventional order ignores tax bracket management. If you drain taxable accounts first and leave traditional IRA balances growing, RMDs from age 73 (75 if born in 1960 or later) can push you into the 24% or 32% bracket. Meanwhile, you may have had years in early retirement where you could have taken traditional IRA withdrawals at the 10% or 12% rate. The conventional order also ignores ACA subsidy cliffs, IRMAA surcharges, and Social Security taxation thresholds.

How does withdrawal order affect ACA health insurance subsidies?

For early retirees under 65, withdrawals from traditional IRAs and 401(k)s count as MAGI and can push you over the ACA subsidy cliff at 400% of the Federal Poverty Level. Roth withdrawals and return-of-basis from taxable accounts do not count toward MAGI. A MAGI-optimized withdrawal order draws from Roth and taxable cost basis first to preserve $15,000-$22,000 per year in ACA premium tax credits.

Should I do Roth conversions instead of traditional IRA withdrawals?

In years where your income is low (early retirement before Social Security starts), Roth conversions are often better than traditional withdrawals. You pay tax at today's low rate and move money to an account that grows tax-free with no future RMDs. QuantCalc's withdrawal optimizer integrates Roth conversion ladder planning to fill low tax brackets before RMDs force larger taxable distributions.

How do Required Minimum Distributions (RMDs) affect withdrawal order?

RMDs begin at age 73 (75 if you were born in 1960 or later) and force taxable withdrawals from traditional IRAs and 401(k)s based on account balance and life expectancy. If your traditional balance is large, RMDs alone can push you into the 22-24% bracket and trigger IRMAA surcharges. Strategic pre-RMD withdrawals and Roth conversions in your 60s and early 70s reduce the traditional balance so that RMDs stay within lower brackets.