Tax-Efficient Retirement Withdrawals

Withdrawal ordering · Account sequencing · Roth conversion windows · SS taxation · IRMAA cliffs · Capital gains harvesting

Most retirees hold money in three types of accounts — pre-tax (traditional IRA/401k), Roth (tax-free), and taxable brokerage. The order in which you draw from them, and when you do Roth conversions, can easily make a $200,000–$400,000 difference in after-tax wealth over a 25-year retirement. This guide explains how to sequence withdrawals intelligently.

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The three account typesTraditional ordering vs. optimalThe conversion windowSS taxation thresholdsIRMAA Medicare surchargesCapital gains harvestingManaging RMDsPractical rules of thumb

AccountsThe Three Tax Buckets

BucketContributionsGrowthWithdrawalsExamples
Pre-taxPre-tax (lowers income now)Tax-deferred100% taxed as ordinary incomeTraditional IRA, 401(k), 403(b)
RothAfter-tax (no current deduction)Tax-freeQualified: 100% tax-freeRoth IRA, Roth 401(k)
TaxableAfter-taxTaxed annually (dividends/interest)Only gains taxed at cap-gains ratesBrokerage accounts
Key insight: Roth withdrawals don't appear on your tax return at all. This is crucial because it means they don't trigger SS taxation, don't count toward IRMAA MAGI, and don't push you into higher brackets.

StrategyTraditional vs. Optimal Withdrawal Order

The conventional wisdom (“spend taxable first, then pre-tax, then Roth last”) isn't always optimal. A better framework:

  1. Required Minimum Distributions (RMDs) — Take these first once you reach age 73 (75 if born in 1960 or later). Non-negotiable.
  2. Fill low brackets with pre-tax — Use enough traditional IRA withdrawals to “fill” the 0%, 10%, and 12% brackets before spending Roth.
  3. Roth conversions in the gap — From retirement to SS start (or age 73), use Roth conversions to fill brackets before SS and RMDs push income up.
  4. Taxable accounts — Sell assets with the lowest gain first; harvest losses; use long-term cap gains rates (0% on long-term gains while MFJ taxable income stays at or below $98,900 in 2026).
  5. Roth IRA last — No RMDs, no tax cost, ideal for legacy. Preserve as long as possible.
Common mistake: Living off taxable/Roth entirely from retirement until RMD age, leaving a huge pre-tax balance that gets hit with large RMDs — and potentially IRMAA surcharges — starting at 73.

RothThe Conversion Window: Retirement to RMDs

The years between retirement and your first RMD (age 73, or 75 if born in 1960 or later) are a golden opportunity for Roth conversions. You typically have:

  • No earned income (pension/SS may be low or not yet started)
  • Low taxable income → fill the 10%/12% brackets cheaply
  • IRMAA look-back of 2 years → conversions today affect Medicare in 2 years

Example (2026, MFJ): Married couple, both 65, ~$80K/year spending, no Social Security yet. Standard deduction is $32,200 plus $1,650 for each spouse age 65+ (about $35,500 combined).

ActionImpact
Take $25K from traditional IRA for spending$25K ordinary income — below the standard deduction, so $0 federal tax on its own
Convert $50K more to Roth$75K gross ordinary income; ≈ $39,500 taxable income after the standard deduction — still inside the 12% bracket (MFJ 12% bracket tops out at $100,800)
Federal tax ≈ $4,244≈ 8.5% effective rate on the $50K conversion; future RMDs reduced and the $50K now grows tax-free in Roth
Target: Convert up to but not past the 22% bracket boundary, and monitor IRMAA thresholds ($218,000 MAGI for MFJ Tier 1 in 2026).

SS TaxSocial Security Taxation Thresholds

Up to 85% of your SS benefit can be subject to income tax. The thresholds are based on “combined income” (AGI + non-taxable interest + half of SS benefit):

Filing StatusCombined IncomeSS Taxable %
SingleBelow $25,0000%
$25,000 – $34,000Up to 50%
Above $34,000Up to 85%
Married Filing JointlyBelow $32,0000%
$32,000 – $44,000Up to 50%
Above $44,000Up to 85%

Roth withdrawals are not counted in combined income — this is a major benefit of keeping Roth funds available in SS-claiming years.

MedicareIRMAA Surcharges

IRMAA (Income-Related Monthly Adjustment Amount) adds surcharges to your Medicare Part B and Part D premiums if your MAGI exceeds certain thresholds. The key: Medicare uses your income from 2 years ago.

2026 MAGI (Individual)Part B Monthly PremiumAdded Annual Cost vs. Base
≤ $109,000$$202.90$0
$109,000+ – $137,000$284.10+$974.40/yr
$137,000+ – $171,000$405.80+$2,434.80/yr
$171,000+ – $205,000$527.50+$3,895.20/yr
Above $205,000$649.20++$5,355.60+/yr
Even a $1 excess over a tier threshold triggers the full surcharge. Plan Roth conversions carefully — stay comfortably within a tier, not at the edge.

TaxableCapital Gains Harvesting

  • 0% long-term cap gains bracket: In 2026, singles with taxable income up to ~$49,450 and MFJ up to ~$98,900 pay zero federal tax on long-term capital gains. In low-income years, harvest gains tax-free.
  • Step up your basis: Sell appreciated positions in 0% bracket years and immediately repurchase — no wash sale rule applies to gains — to reset your cost basis.
  • Loss harvesting: In down years, realize losses to offset gains and up to $3,000 of ordinary income annually. Unused losses carry forward indefinitely.
  • Asset location: Hold high-yield bonds and REITs in tax-deferred accounts; hold stocks with embedded gains in taxable or Roth accounts.

RMDsManaging Required Minimum Distributions

RMDs start at age 73 (75 if born in 1960 or later). They are calculated on your traditional IRA and 401(k) balances as of Dec 31 of the prior year, divided by an IRS life-expectancy factor.

  • QCDs (Qualified Charitable Distributions): From age 70½, donate up to $111,000/year directly from your IRA to charity — counts toward your RMD but not your income. Powerful for charitable retirees.
  • Aggregate rule: Multiple traditional IRAs — you can take the combined RMD from any one account.
  • Still working exception: If you are still employed and own less than 5% of the company, you can delay your current employer's 401(k) RMD past age 73.
  • Penalty: 25% excise tax on any RMD shortfall (reduced to 10% if corrected within 2 years).

SummaryPractical Rules of Thumb

  • During the conversion window (retirement to RMD age), convert annually up to the top of the 12% or 22% bracket — whichever keeps you under IRMAA Tier 1.
  • Never pay more than 22% on a Roth conversion unless you're eliminating a bracket cliff or protecting an inheritance.
  • Delay SS to 70 if healthy — this extends the low-income conversion window and permanently raises your SS benefit (and step-up for a surviving spouse).
  • Keep at least 2–3 years of spending in Roth to tap in a bad market year without triggering extra ordinary income.
  • Review IRMAA exposure every November using your year-to-date MAGI before year-end.

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