The Retirement Tax Changes Hiding a Massive Planning Window in 2026

If you are in or near retirement, the biggest mistake right now is treating these tax changes like trivia. They create a real planning window for the next few years, and the people who act early will keep more of their money with the same assets. The Kiplinger piece is a good overview, but the real insight is how these rules stack together when you are timing Social Security, required minimum distributions, capital gains, and Roth conversions. 

Sources
• https://www.irs.gov/newsroom/one-big-beautiful-bill-act-tax-deductions-for-working-americans-and-seniors
• https://www.irs.gov/newsroom/check-your-eligibility-for-the-new-enhanced-deduction-for-seniors
• https://www.kiplinger.com/taxes/tax-planning/in-or-near-retirement-recent-tax-changes-to-know

1) The new senior deduction creates a sneaky Roth conversion runway

There is now an extra $6,000 deduction for taxpayers age 65 and older, available for 2025 through 2028, and it phases out above $75,000 of modified adjusted gross income for single filers and $150,000 for joint filers. For couples where both spouses qualify, that is up to $12,000 of extra deduction space. This matters because it can create room to recognize additional income at little or no marginal tax cost in years when your taxable income is otherwise lower, often the gap years after retirement but before Social Security and before larger required minimum distributions. In plain English, you may be able to convert more to Roth without moving into a higher bracket than you expected. 

Sources
• https://www.irs.gov/newsroom/one-big-beautiful-bill-act-tax-deductions-for-working-americans-and-seniors
• https://www.irs.gov/newsroom/check-your-eligibility-for-the-new-enhanced-deduction-for-seniors
• https://www.pgpf.org/article/understanding-the-new-senior-deduction-in-the-one-big-beautiful-bill-act/

What most people miss is that this is not just a tax bracket conversation. It is also a Medicare premium conversation. Large Roth conversions can raise your modified adjusted gross income and trigger higher Medicare Part B and Part D premiums through IRMAA. So the right move is not always to convert the maximum amount possible. The right move is to convert up to the amount that keeps you inside your planned tax bracket and inside your desired Medicare premium band. 

Sources
• https://www.ssa.gov/benefits/medicare/medicare-premiums.html
• https://www.irs.gov/newsroom/check-your-eligibility-for-the-new-enhanced-deduction-for-seniors
• https://www.kiplinger.com/taxes/tax-planning/smart-ways-to-use-your-tax-return-for-financial-planning

2) The SALT cap expansion is real but the phase down is where people get burned

The state and local tax deduction cap has been increased to $40,000 starting in 2025, with a 1% annual increase through 2029. That means $40,400 in 2026. This can change the math for people who itemize, especially homeowners with meaningful property taxes. But there is a catch that can create unpleasant surprises: the expanded cap is reduced for higher income taxpayers above set thresholds and the reduction can behave like a stealth marginal tax increase if you are near the cutoff. 

Sources
• https://www.fidelity.com/learning-center/personal-finance/SALT-deduction-increase
• https://turbotax.intuit.com/tax-tips/tax-deductions-and-credits/unlocking-the-new-salt-cap-how-to-save-up-to-40000-this-tax-season/c3JPyW2bC
• https://blog.taxact.com/what-is-the-salt-tax-deduction/
• https://tax.thomsonreuters.com/blog/how-the-one-big-beautiful-bill-reshapes-salt-planning/

The planning move here is simple. Do not assume you should itemize just because the cap is larger. Run both scenarios. In some cases, bunching deductions across years can create a larger benefit than itemizing every year. Also, some states have not conformed cleanly to the federal changes, so the state return may not mirror the federal strategy. 

Sources
• https://www.kiplinger.com/taxes/tax-planning/smart-ways-to-use-your-tax-return-for-financial-planning
• https://www.irs.gov/publications/p17
• https://tax.thomsonreuters.com/blog/how-the-one-big-beautiful-bill-reshapes-salt-planning/

3) Roth catch up rules in 2026 change the best pre retirement play for high earners

Starting in 2026, if you are age 50 or older and your prior year wages exceed the threshold, catch up contributions generally must be Roth. IRS and Treasury issued final regulations and guidance to implement this, and it is a real change because it removes the pre tax deduction for those catch up dollars. So for some high earners, the best move is no longer maxing catch up inside the plan. The better move can be building liquidity in a brokerage account and then doing Roth conversions in lower income years after you stop working. 

Sources
• https://www.irs.gov/newsroom/treasury-irs-issue-final-regulations-on-new-roth-catch-up-rule-other-secure-2point0-act-provisions
• https://www.quarles.com/newsroom/publications/secure-2-0-act-retirement-plan-update-roth-catch-up-contributions-in-2026
• https://www.fidelity.com/learning-center/personal-finance/retirement/roth-catch-up-contributions-rule
• https://www.empower.com/the-currency/money/roth-catch-up-contributions-rule

Here is the thing many people miss and it matters a lot. If your employer plan does not offer a Roth option, impacted participants can lose the ability to make catch up contributions under the new rule until the plan adds Roth. That is an operational detail, but it is a huge planning detail because it can disrupt your entire retirement savings plan. This is a question to ask your employer now, not in December. 

Sources
• https://www.irs.gov/newsroom/treasury-irs-issue-final-regulations-on-new-roth-catch-up-rule-other-secure-2point0-act-provisions
• https://www.asppa-net.org/news/2026/2/roth-catch-up-contributions-final-regulations-and-415c-interactions/

4) The super catch up ages 60 to 63 can be powerful but only if you know what bracket you are buying

For ages 60 to 63, catch up contribution limits are higher, and IRS has been publishing annual updates on contribution limits and the SECURE 2.0 related changes. The important strategy question is not whether you can contribute more. It is whether you should contribute more pre tax, more Roth, or shift savings outside the plan depending on your expected tax rate later. If you are in peak earnings years, paying tax now on Roth catch up may not be optimal. If you are scaling down income into retirement, Roth can be a gift to your future self. 

Sources
• https://www.irs.gov/newsroom/401k-limit-increases-to-24500-for-2026-ira-limit-increases-to-7500
• https://www.irs.gov/newsroom/treasury-irs-issue-final-regulations-on-new-roth-catch-up-rule-other-secure-2point0-act-provisions

The 2026 move I would track that most people are not tracking

Track your “income stacking” effect. Not just your tax bracket. Your stack includes Roth conversions, capital gains, Social Security taxation, and Medicare IRMAA. It is very easy to plan a conversion that looks smart on a tax chart and then accidentally trigger higher Medicare premiums or push more of your Social Security into taxable territory later. The win is not lowest tax this year. The win is lowest lifetime tax and lowest lifetime premium drag. 

Sources
• https://www.ssa.gov/benefits/retirement/planner/taxes.html
• https://www.ssa.gov/benefits/medicare/medicare-premiums.html
• https://www.irs.gov/newsroom/check-your-eligibility-for-the-new-enhanced-deduction-for-seniors