Bracket-Fill Withdrawal Strategy: Turning Low-Income Years Into Tax Savings

For the broader withdrawal-sequencing context, start with Withdrawal Sequencing: A Complete Guide. This piece focuses specifically on the bracket-fill tactic — how to identify the right ceiling, how much to pull, and how it compounds over a retirement.

The core insight

For most middle-to-high-net-worth retirees, the years between retirement (often 60-65) and RMD start (73 for those born 1951-1959, 75 for 1960+) are the lowest-taxable-income years of their post-career life. Before Social Security claims in, before pension starts (or with modest pension), before RMDs force large traditional distributions — taxable income is often well below working-years levels.

Bracket-fill takes advantage of this window. Instead of leaving traditional accounts untouched during low-income years (the conventional default), you intentionally draw from them up to a tax-bracket ceiling. The dollars pulled now at 12% are dollars that won’t be forced out later at 22%, 24%, or higher when RMDs stack with Social Security and trigger IRMAA.

The name “bracket fill” reflects the mechanic: you’re filling up the unused room in a favorable tax bracket rather than leaving it empty.

The 2026 bracket landscape

2026 ordinary income brackets (MFJ):

2026 standard deduction (MFJ): $32,200 base, plus $1,650 per spouse age 65+, plus $12,000 temporary senior deduction if both spouses are 65+ and MAGI is under $150K.

Practical math: For a 2026 MFJ couple both 65+, taking the standard deduction plus senior deduction, gross income of ~$148,300 produces taxable income at the top of the 12% bracket ($100,800). That’s a striking figure — a couple can have nearly $150K of gross income and still be in the 12% bracket.

For single filers (MAGI under $75K), the math is roughly half: standard deduction $16,100 + $2,050 age 65+ addition + $6,000 senior deduction = $24,150 total deduction. Gross income of ~$74,550 keeps you at the top of the 12% single bracket ($50,400 taxable).

The bracket-fill calculation

Step 1: Project baseline taxable income for the year.

Sum everything that’s already taxable:

• Taxable portion of Social Security (up to 85%)
• Pension income
• RMDs if applicable
• Realized capital gains (from taxable account)
• Interest and dividends
• Any W-2 or self-employment income
• Other taxable income

Call this number B (baseline).

Step 2: Calculate target bracket ceiling.

Choose the ceiling you want to fill up to — usually the top of the 12% bracket.

For MFJ in 2026, 12% bracket ceiling = $100,800 taxable income. After standard deduction + senior additions + senior deduction (where applicable), that’s ~$148,300 of gross income for most retired couples.

Call this number C (ceiling).

Step 3: Calculate room.

Room = C − B.

This is the amount of additional traditional IRA withdrawals (or Roth conversions) that would fit inside your chosen bracket.

Step 4: Execute.

Pull the “room” amount from traditional IRAs. If you don’t need it for spending, reinvest the after-tax proceeds in your taxable account — you’ve effectively converted traditional dollars into taxable account dollars at a 12% rate, removing them from the future RMD pool.

Or convert the “room” amount to Roth, moving the dollars into a tax-free compounding account.

Worked example 1: Modest assets, early retirement

Household. Married couple, both 62. Retired early. Social Security not claimed yet. $800K traditional IRA, $250K taxable brokerage, $100K Roth IRA. Annual spending: $80K.

Year 1 (age 62):

• Baseline taxable income: ~$5K from taxable account dividends. Call it $5K.
• 12% ceiling (MFJ, both under 65 so no senior deduction): $100,800 taxable, equal to ~$133K gross (standard deduction $32,200).
• Room: $133K − $5K = $128K.

Spending plan: Pull $70K from taxable brokerage to fund spending, leaving the remaining $10K of spending from traditional IRA. Add another $90K of traditional IRA withdrawals for bracket-fill — not needed for spending, but the tax opportunity is huge.

Results:

• Total traditional IRA withdrawal: $100K
• Taxable income after standard deduction: ~$73K (still entirely in 12% bracket)
• Federal tax: ~$8,000 (effective rate ~8%)
• After-tax traditional dollars extracted: $92K. Use $10K for spending; invest the remaining $82K in taxable brokerage.

Over 11 years (age 62-72), repeating similar:

• Traditional balance reduced by ~$1.1M in withdrawals (plus growth that would have occurred) — down from $800K start to perhaps $400K with some growth offset
• Taxable brokerage has grown substantially
• At age 73, first RMD on $400K balance: ~$15K. Manageable, entirely within 12% bracket even with Social Security.
• Lifetime federal tax: $50-100K less than if they’d left the traditional untouched until RMDs.

Worked example 2: Higher assets, traditional-heavy

Household. Married couple, both 65. $2M traditional IRA, $500K taxable brokerage, $200K Roth IRA. Social Security claimed by both (combined $55K). Annual spending: $110K.

Year 1 (age 65):

• Baseline taxable income: Social Security taxable portion ~$46.75K (85%), plus $8K dividends = ~$55K.
• 12% ceiling MFJ both 65+: gross income ~$148,300 produces taxable income at $100,800 ceiling (after $32,200 standard + $3,300 age 65+ addition ($1,650 × 2) + $12,000 senior deduction = $47,500 total deduction).
• Gross income headroom: $148,300 − (Social Security $55K + dividends $8K) = ~$85,300 of elective income room.

Spending plan: Spending need is $110K. Baseline after-tax income (Social Security + dividends) is ~$55K — leaves a $55K gap.

Bracket-fill approach:

• Pull $55K from traditional IRA for spending (fills the gap)
• Pull an additional $30K from traditional IRA for bracket-fill (still within 12% bracket; reinvest in taxable after paying ~12% tax)
• Total traditional IRA withdrawal: $85K

Results year 1:

• AGI ~$148K, taxable income ~$100K (top of 12% bracket exactly)
• Federal tax: ~$11,500
• After-tax of the $30K bracket-fill: ~$26.4K to invest in taxable
• Traditional balance reduced by $85K; taxable brokerage grew by $26.4K

Over 8 years (age 65-72), repeating:

• Total traditional withdrawn: $680K ($55K × 8 for spending + $30K × 8 for bracket-fill)
• Traditional balance at age 73 (after growth): roughly $1.7M instead of $2.3M+ if they’d only funded spending
• Initial RMD at 73 on $1.7M balance: ~$64K
• Alternative RMD if balance were $2.3M: ~$87K
• Savings from smaller RMDs: ~$23K per year through late 70s, compounding

The alternative (conventional taxable-first approach) leaves the couple with a larger traditional balance, larger RMDs that combined with Social Security push them into the 22% bracket and potentially IRMAA tier 1 ($218K MAGI MFJ threshold for 2026).

Worked example 3: Single filer with pension

Household. Single, age 64, recently retired. $600K traditional IRA, $200K taxable brokerage, $150K Roth IRA. Pension $30K/year. Plans to claim Social Security at 70. Annual spending: $60K.

Year 1 (age 64):

• Baseline taxable income: Pension $30K + dividends $5K = $35K
• Single filer 12% ceiling 2026: taxable income $50,400 (gross ~$66,500 with standard deduction $16,100; senior deduction not yet available until 65)
• Gross income headroom: $66,500 − $35K = ~$31,500

Spending plan: $60K need minus $30K pension = $30K gap. Can fund from taxable (would realize small gains) or from traditional (would use bracket room).

Bracket-fill approach: Pull $30K from traditional for spending plus another $15K bracket-fill. Total traditional $45K, fills the 12% bracket.

Result year 1:

• Taxable income ~$50K (within 12% bracket)
• Federal tax: ~$5,500
• After-tax bracket-fill proceeds of $15K × 0.88 = ~$13K to invest in taxable

Year 2 (age 65): Senior deduction becomes available. Gross income headroom widens to ~$72,500. Room for more bracket-fill.

Over 6 years (age 64-69, before Social Security):

• Traditional withdrawals: $45K × 6 = $270K (mix of spending and bracket-fill)
• Traditional balance drops from $600K to perhaps $400K (accounting for some growth)
• Social Security claim at 70 adds ~$42K (maximum SS with delay) to taxable income
• RMDs at 73 on the reduced $400K balance: ~$15K (instead of ~$23K on untouched $600K balance)
• Less RMD + Social Security stack pressure later

When to stop bracket-filling

The 12% bracket is almost always worth filling completely. What about filling into the 22% bracket?

Sometimes yes. If your expected future RMDs plus Social Security plus other income will put you firmly in the 24% bracket, filling up through the 22% bracket now still saves money. The math: 22% now vs 24% later is a 2 percentage point savings, plus the IRMAA and Social Security taxation cascade effects.

Usually no. The jump from 12% to 22% is larger (10 percentage points) than the 22%-to-24% jump (2 points). Going past the 12% ceiling to reach the 22% bracket makes sense only if you’re confident future rates will be meaningfully higher.

Rarely above 22%. Filling into the 24% or 32% bracket is usually counterproductive — you’re pre-paying high rates on money that might have been taxed at lower or equal rates later. Exception: if you expect to lose a spouse and become a single filer soon, pre-paying at 22-24% MFJ rates may beat paying at 32% single rates later.

Common mistakes

Miscalculating baseline income. Forgetting about small things (REIT distributions, bond fund dividends, year-end capital gains distributions) can push you past your intended bracket. Build in a $5-10K buffer.

Not accounting for Social Security taxation cascades. When you’re below the Social Security taxation thresholds, adding traditional withdrawals can push Social Security into taxable status faster than the marginal income alone suggests. A household just under the 50% SS taxation threshold who pulls $10K from traditional might see taxable income rise by $14K ($10K + $4K newly-taxable SS).

Executing late in the year without buffer. A December bracket-fill decision relies on already-knowing year-end dividend distributions, realized gains, and other income. If a mutual fund makes an unexpected large December distribution after your bracket-fill is done, you may have crossed the ceiling. Plan earlier or leave buffer.

Taking bracket-fill and then using it for Social Security-taxation-triggering realizations. If you bracket-fill then realize large capital gains later the same year, the interaction can trigger the tax torpedo. Coordinate all taxable events against the bracket ceiling.

Not reinvesting the proceeds. If you pull $30K from traditional for bracket-fill purposes, pay $3,600 tax, and then leave $26,400 in a checking account earning nothing, you’ve failed to capture most of the benefit. The bracket-fill dollars should go into a taxable investment account to keep compounding.

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Frequently asked questions

Sources

Chris Gammill is the founder of Ignis Tools and writes about tax-aware retirement planning. Research and drafting assisted by AI tools; all figures and claims verified by the author against primary sources.

1. IRS Revenue Procedure 2025-32 — 2026 inflation adjustments — retrieved 2026-04-21
2. Fidelity Viewpoints — Tax-savvy withdrawals in retirement — retrieved 2026-04-21
3. Nationwide Financial — 2026 Tax Strategies for Retirees — retrieved 2026-04-21