Effective bracket management starts with understanding the three types of accounts — and how income from each is taxed differently. The goal is to maintain a balance across all three so you always have flexibility to draw from the lowest-tax source in any given year.
Traditional IRA / 401(k)
Contributions were pre-tax. Every dollar withdrawn is taxed as ordinary income. Subject to RMDs at 73. The largest and most dangerous bucket for most retirees.
Roth IRA / IUL
Contributions were after-tax. Qualified withdrawals are completely tax-free. No RMDs. The most valuable bucket — and the one most retirees don't have enough of.
Brokerage / savings
After-tax contributions. Gains taxed at capital gains rates — potentially 0% in lower brackets. Interest and dividends taxed annually. Step-up in basis at death.
| Rate | Taxable income | Strategy opportunity |
|---|---|---|
| 10% | Up to $11,600 | Fill completely — lowest possible rate |
| 12% | $11,601 – $47,150 | Fill with Roth conversions and capital gain harvesting |
| ✓ 24% sweet spot | $100,526 – $191,950 | Primary Roth conversion window — before RMDs force higher brackets |
| 32% | $191,951 – $243,725 | Avoid if possible — consider pausing conversions here |
| 35% | $243,726 – $609,350 | High net worth — conversion math still works at scale |
| 37% | Over $609,350 | Highest bracket — still beneficial if 2026 rates rise further |
⚙️ Fill bracket headroom with Roth conversions
Calculate the gap between your current taxable income and the top of your target bracket. Convert exactly enough traditional IRA funds to fill that gap each year — no more. This locks in today's lower rate on those dollars permanently, reducing future RMDs and tax-free income grows for heirs.
📈 Harvest capital gains at 0%
In tax years where your taxable income falls in the 10% or 12% bracket, long-term capital gains are taxed at 0% federally. Systematically sell and repurchase appreciated positions in taxable accounts during low-income years to permanently step up your cost basis — tax-free.
📅 Use the retirement-to-RMD window strategically
The years between retirement and age 73 are often the lowest-income years of your life — before Social Security, before RMDs, and with maximum bracket headroom. This is your conversion window. Every dollar you convert during this period reduces the size of your future RMDs and permanently removes it from the tax-deferred bucket.
💊 Manage IRMAA thresholds proactively
IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare premium surcharge that kicks in at specific MAGI thresholds. A Roth conversion that pushes you $1 over a threshold can cost thousands in additional Medicare premiums. Plan conversions to stay just below IRMAA cliff points.
⚠️ What is IRMAA and why it matters for bracket management
IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare premium surcharge applied to high-income retirees. It is triggered automatically when your MAGI exceeds specific thresholds — and it hits based on income from 2 years prior. A Roth conversion in 2024 affects your Medicare premiums in 2026. Most retirees don't see it coming until the bill arrives.
2024 IRMAA thresholds at a glance
| Single MAGI | MFJ MAGI | Extra annual cost |
|---|---|---|
| Up to $103,000 | Up to $206,000 | $0 — base rate |
| $103,001 – $129,000 | $206,001 – $258,000 | +$1,082/yr |
| $129,001 – $161,000 | $258,001 – $322,000 | +$2,696/yr |
| $161,001 – $193,000 | $322,001 – $386,000 | +$4,313/yr |
| Above $193,000 | Above $386,000 | +$4,849–$5,168/yr |
⚠️ The IRMAA cliff — don't get blindsided
IRMAA is assessed based on income from 2 years prior. A large Roth conversion in 2024 affects your 2026 Medicare premiums. The 2024 IRMAA surcharges begin at $103,000 MAGI for single filers and $206,000 for married filing jointly. Crossing a threshold by even $1 can add $800–$5,000+ per year in Medicare Part B and D premiums. Always model IRMAA impact before executing a large conversion.