The Tax Cuts and Jobs Act (TCJA) of 2017 created the widest tax brackets in modern history. The 24% bracket, for example, extends to over $190,000 for married couples filing jointly — creating an enormous “conversion corridor” for strategic Roth conversions. But many of these provisions are scheduled to sunset, and the political landscape adds uncertainty to what comes next. For pre-retirees with large traditional IRA balances, the planning window may be narrowing.
What the TCJA Changed
The TCJA made several changes that directly benefit Roth conversion planning:
Wider Tax Brackets
The 22% and 24% brackets were significantly expanded, allowing married couples to convert substantially more at lower rates than under pre-TCJA law.
Lower Marginal Rates
The top rate dropped from 39.6% to 37%, and several intermediate brackets were reduced. This means every dollar converted costs less in taxes than it would have before 2018.
Higher Standard Deduction
The nearly doubled standard deduction ($30,000+ for married couples) effectively creates a “zero percent bracket” that can absorb some conversion income at no federal tax cost.
What Could Change
The TCJA's individual tax provisions were originally set to expire after 2025. While legislative action may extend some or all of these provisions, the outcome remains uncertain. Here's what's at stake:
If Brackets Revert
- • The 24% bracket could shrink significantly
- • The 25% and 28% brackets would return
- • Top rate rises back to 39.6%
- • Standard deduction roughly halved
If Extended or Modified
- • Current brackets may continue
- • Some provisions may be modified
- • New revenue measures could offset
- • Political negotiations create uncertainty
The Risk of Waiting
If you're sitting on a large traditional IRA balance and waiting to see what happens with tax policy, you're making a bet that future rates will be the same or lower. Given the national debt trajectory and the bipartisan pressure to raise revenue, that bet may not pay off. Converting at today's known rates eliminates the uncertainty.
The Roth Conversion Corridor
The “conversion corridor” is the gap between your current taxable income and the top of your target tax bracket. Under current law, this corridor is historically wide.
Example
A married couple with $60,000 in taxable income (after deductions) has roughly $130,000 of “headroom” before hitting the top of the 24% bracket. That's $130,000 they could convert to Roth at a 24% or lower effective rate. If the TCJA sunsets, that same couple might only have $60,000-$70,000 of headroom before hitting the 28% bracket — nearly cutting their conversion capacity in half.
Why Early-Year Planning Matters More Than Ever
Map Your Thresholds in January
Project your baseline income for the year. Identify exactly how much conversion headroom you have in each bracket. Account for IRMAA cliffs, Social Security taxation thresholds, and state tax implications.
Execute in Tranches
Don't wait until December to convert. Execute partial conversions throughout the year, especially during market dips when the tax cost per share is lower.
Monitor Legislative Developments
Tax policy can shift quickly. Having a plan in place allows you to accelerate or decelerate conversions based on what Congress does — rather than scrambling at year-end.
Beyond Outside Funds: Advanced Tax Funding Strategies
While paying conversion taxes from outside funds is the standard best practice, in certain qualifying situations we can structure the conversion so that the tax cost is funded from within the strategy itself — without requiring outside cash. This advanced approach is situation-dependent and not widely available. Ask us about it in your Discovery Session.
The Window Is Open Now
Regardless of what happens legislatively, the current tax environment is objectively favorable for Roth conversions. Wide brackets, low rates, and high standard deductions create a conversion opportunity that may not exist in its current form for much longer. The cost of waiting is the risk of converting at higher rates later — or not converting at all.
The Bottom Line
Tax policy uncertainty is not a reason to freeze. It's a reason to act strategically while the rules are known and favorable. A well-planned Roth conversion executed at today's rates locks in a known tax cost and eliminates the risk of higher rates in the future.
Don't Let the Window Close Without a Plan
Every year you wait is a year of conversion headroom you can't get back. Schedule a free Discovery Session and we'll map your conversion corridor, model the tax impact, and build a multi-year strategy that adapts to whatever Congress decides.
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