2026 Senior Bonus Deduction Phase-Out Above $75K MAGI

The 2026 senior bonus deduction phase out refers to the $6,000 tax deduction established by the Older Americans Benefit Boost Act (OBBBA) for taxpayers age 65 and older, which begins to disappear when modified adjusted gross income (MAGI) exceeds $75,000 for single filers.¹ This above-the-line deduction can reduce taxable income substantially, but high-income retirees may lose it entirely if their MAGI crosses the threshold.

How the OBBBA Phase-Out Works: The 6% Rule at $75K MAGI

The 2026 senior bonus deduction phase out refers to the $6,000 tax deduction created by the Older Americans Benefit Boost Act (OBBBA) for taxpayers age 65 and older, which begins to disappear when modified adjusted gross income (MAGI) exceeds $75,000 for single filers.

The OBBBA provides a $6,000 above-the-line deduction for single filers age 65 and older, and $12,000 for married couples filing jointly where both spouses are 65 or older, for tax years 2025 through 2028.¹

For a single filer with $100,000 MAGI, the calculation works as follows: $100,000 minus $75,000 equals $25,000 in excess income.¹ Six percent of $25,000 is $1,500, so the $6,000 deduction is reduced to $4,500.¹

Why Your Standard Deduction Calculation Just Changed

The OBBBA deduction sits above the line, meaning it reduces adjusted gross income before the standard or itemized deduction is applied.² This changes the math for retirees who have historically compared their itemized deductions against the standard deduction to decide which path to take.

Consider a retiree with $20,000 in medical expenses, $5,000 in charitable contributions, and $8,000 in state and local taxes. Total itemized deductions equal $33,000.¹ Without the OBBBA, this retiree would itemize to capture the $33,000. But with the $6,000 OBBBA deduction reducing AGI first, the retiree can take the standard deduction plus the OBBBA, receiving $22,550 in total deductions — still less than $33,000, so itemizing remains better.³

However, for a retiree with only $12,000 in medical expenses and $4,000 in charitable contributions, total itemized deductions equal $16,000.³ The standard deduction plus OBBBA equals $22,550,³ making the standard path clearly superior. The OBBBA effectively raises the bar for when itemizing makes sense, and many retirees will need to recalculate their approach.

Which Income Sources Count Toward the Phase-Out Threshold

MAGI for the OBBBA phase-out includes all taxable income sources common in retirement. Traditional IRA and 401(k) withdrawals count fully, as do taxable Social Security benefits, rental income, part-time wages, and business income from consulting or freelance work.⁴ Municipal bond interest, while tax-exempt for regular income tax purposes, is included in MAGI for this phase-out calculation.⁴

Long-term care insurance premiums and health insurance premiums for early retirees also count toward MAGI if claimed as an above-the-line deduction.⁵ Gambling losses, when deducted as an itemized expense, do not affect MAGI, but gambling winnings count as income. This creates a trap where a retiree who wins, for example, $10,000 at a casino and deducts $10,000 in losses still reports the $10,000 in MAGI, potentially triggering the phase-out.

Roth Conversion Strategy to Keep MAGI Below $75K

Roth conversions offer a way to manage future MAGI, but the timing matters. Converting a traditional IRA to a Roth IRA adds the converted amount to MAGI in the year of conversion, which can push a retiree over the $75,000 threshold and trigger the phase-out.

Suppose a retiree has $60,000 in MAGI from Social Security and a small pension. They want to convert, for example, $30,000 from a traditional IRA to a Roth IRA. The conversion brings total MAGI to $90,000, which exceeds the $75,000 threshold by $15,000.³ The phase-out reduces the OBBBA deduction by $900 (6% of $15,000), leaving an effective deduction of $5,100.⁴

A better approach is to convert in smaller increments across multiple years. Converting $15,000 per year for two years keeps MAGI at $75,000 in each year, preserving the full $6,000 deduction. The retiree still moves the same total amount to Roth but avoids losing $900 in deductions each year — a typical savings for someone whose MAGI exceeds the threshold by $15,000.⁴

How Social Security Timing Affects Your Phase-Out Exposure

Social Security benefits become partially taxable when provisional income exceeds certain thresholds. For single filers, up to 50% of benefits are taxable when provisional income is between $25,000 and $34,000, and up to 85% when it exceeds $34,000.² The OBBBA deduction reduces AGI, which in turn reduces provisional income and can lower the taxable portion of benefits.

A retiree who delays Social Security to age 70 receives higher monthly benefits but also increases their MAGI in later years. Suppose a retiree with $40,000 in pension income and $30,000 in Social Security benefits has provisional income of $55,000. Up to 85% of benefits is taxable — for example, $25,500. Adding this to the pension yields MAGI of $65,500, which falls below the $75,000 phase-out threshold.¹ The full $6,000 OBBBA deduction applies.

If the same retiree delays benefits to age 70 and receives, for example, $38,000 annually instead of $30,000, provisional income rises to $59,000. Taxable benefits increase to roughly $32,300, pushing MAGI to approximately $72,300. Still below $75,000, but with less room for other income. A retiree who also takes a $10,000 IRA withdrawal in the same year would see MAGI hit $82,300, triggering the phase-out. The interaction between claiming age and withdrawal timing requires careful coordination.²

Avoiding the IRMAA Feedback Loop That Erodes the Deduction

Medicare Income-Related Monthly Adjustment Amounts (IRMAA) are surcharges added to Part B and Part D premiums when income exceeds certain thresholds. The OBBBA deduction reduces MAGI, which can help retirees stay below IRMAA thresholds and avoid these surcharges.²

¹ The OBBBA deduction, if available, would reduce 2024 MAGI to roughly $100,000, potentially keeping the retiree below the first IRMAA threshold and saving thousands in surcharges.

The feedback loop works in reverse as well. A retiree who takes a large IRA withdrawal to cover a one-time expense, for example a new roof costing $25,000, increases MAGI by that amount. Suppose the withdrawal pushes MAGI from $90,000 to $115,000 — the retiree loses part of the OBBBA deduction and may trigger IRMAA surcharges. The combined cost, lost deduction plus higher premiums, can exceed $6,000 in a single year. Planning for large expenses by spreading withdrawals across multiple years or using Roth funds avoids this double penalty.⁶

Applying This to Your Actual Tax Plan

The practical application of these rules requires a year-by-year income projection. Suppose a retiree has $50,000 in Social Security, $20,000 in pension income, and $15,000 in required minimum distributions from a traditional IRA — their MAGI would be approximately $77,500 after accounting for taxable Social Security. This exceeds the threshold by a few thousand dollars, reducing the OBBBA deduction proportionally.

To preserve the full deduction, the retiree could use qualified charitable distributions (QCDs) from the IRA to satisfy the RMD requirement without increasing MAGI. A $15,000 QCD sent directly to a charity satisfies the RMD and keeps the $15,000 out of MAGI, bringing total MAGI to $62,500 and preserving the full $6,000 deduction.

For retirees with multiple income sources, the optimal withdrawal order is: Roth accounts first (no MAGI impact), then taxable brokerage accounts (only capital gains count), then tax-deferred accounts (full withdrawal counts), and finally required minimum distributions (mandatory but can be offset by QCDs). This sequencing minimizes MAGI and maximizes the OBBBA deduction each year.⁴

Your Next Step

Run a projection of your 2026 MAGI using your expected Social Security benefits, pension income, IRA withdrawals, and any part-time work. Compare the result to the $75,000 single or $150,000 joint threshold. If you are within $10,000 of the threshold, identify one income source you can reduce — a smaller IRA withdrawal, a QCD instead of a cash RMD, or delaying a Roth conversion until a lower-income year. Write down the specific dollar change and recalculate your projected MAGI. This single exercise can save you $6,000 in deductions and potentially thousands more in IRMAA surcharges.