OBBBA Tax Guide for Feds 2026: The $6,000 Senior Deduction, IRMAA Trap & What Got Cut

Last Updated: May 24, 2026 Reading Time: 14 min

The One Big Beautiful Bill Act (P.L. 119-21, signed July 4, 2025) is the largest single tax law change federal employees have seen since the 2017 Tax Cuts and Jobs Act. The headline for working feds: the bracket cliff that was set to hit in 2026 does not happen. The headline for retirees age 65+: a new $6,000 personal deduction (2025-2028) stackable on top of the standard deduction, worth up to $1,320 in annual tax savings at the 22% bracket. The headline that did not happen: the FERS Supplement, High-3 calculation, and current FERS contribution rates all survived the bill intact after the Senate stripped the anti-civil-service provisions.

Key Takeaways

• TCJA brackets are now permanent (10%/12%/22%/24%/32%/35%/37%). The 2026 tax cliff is gone.
• $6,000 senior deduction per person age 65+ (2025-2028 only). Stacks on standard deduction. Phase-out: single $75K-$175K MAGI, MFJ $150K-$250K (one spouse 65+) or $150K-$350K (both 65+).
• FERS Supplement, High-3, and FERS contribution rates are unchanged. All anti-civil-service provisions were stripped before final passage.
• SALT cap rose from $10,000 to $40,000 (2025-2029), phasing out above $500K MAGI. Meaningful for itemizing GS-13/15 feds in high-tax states.
• Overtime deduction up to $12,500 for FLSA-eligible feds. Most GS professionals are FLSA-exempt and do not qualify.
• TSP in-plan Roth conversion is now available (since January 28, 2026), separate from OBBBA. Conversions spike MAGI, which can trigger IRMAA two years later.
• State conformity is patchwork. Virginia decoupled. Maryland is conditional. DC is contested. DMV feds get the federal benefit but not always a matching state benefit.

What the OBBBA Actually Changed (Confirmed Provisions)

Permanent provisions (no sunset date):

• TCJA tax brackets (10%, 12%, 22%, 24%, 32%, 35%, 37%) made permanent.
• Enhanced standard deduction: $15,750 single, $31,500 MFJ (inflation-adjusted annually from 2026).
• Child Tax Credit at $2,200 per child (inflation-indexed from 2026), refundable up to $1,700, phase-out $200K single / $400K MFJ.
• Estate and gift exemption at $15 million per person ($30 million MFJ), inflation-indexed from 2026.

Temporary provisions (2025-2028 only):

• Senior deduction: $6,000 per person age 65+. Stackable on standard or itemized deductions.
• Overtime deduction: up to $12,500 per individual ($25,000 MFJ) for FLSA-required premium pay. Phase-out starts $150K single / $300K MFJ.
• Tip deduction: up to $25,000 for qualified tips. Phase-out starts $150K / $300K.
• Auto loan interest deduction: up to $10,000 for new U.S.-assembled vehicles. Phase-out $100K-$150K single / $200K-$250K MFJ.

SALT cap (2025-2029):

• Cap raised from $10,000 to $40,000 ($40,400 in 2026 with a 1% annual index). Reverts to $10,000 in 2030 absent further legislation. Phase-out starts $500,000 MAGI.

That is the actual scope. Several other tax provisions were proposed but did not make the final bill.

What the OBBBA Did NOT Do (Common Misconceptions)

A lot of misinformation circulated during the bill's passage. Here is what the law does not do:

Claim	Reality
"No tax on Social Security"	False. Up to 85% of SS benefits remain taxable. The senior deduction reduces taxable income and may indirectly lower SS taxation by changing AGI, but it is not an SS-specific exemption.
"FERS Supplement eliminated starting 2028"	False. Stripped from the bill before Senate passage. Supplement continues under current law for all eligible retirees.
"Federal employees will pay more in FERS contributions"	False. Stripped. Current contribution rates apply to existing employees and new hires.
"High-5 replaces High-3"	False. Removed before final passage. Annuities still calculated on highest 3 years of basic pay.
"The senior deduction reduces IRMAA"	False. Reduces taxable income only. MAGI for Medicare lookback is unchanged.
"Salaried GS feds get the overtime deduction"	False for most. Most GS professional positions are FLSA-exempt and do not qualify.
"The $40,000 SALT cap automatically applies in Virginia"	False. Virginia decoupled from OBBBA personal provisions through at least 2026. Federal benefit applies, but Virginia returns do not reflect the change without state legislation.

The FERS Supplement scare is worth a beat on its own. The House-passed version of H.R. 1 included a provision to eliminate the supplement starting January 1, 2028, alongside a proposed switch to a High-5 calculation and increased FERS contribution rates for current employees. The Senate parliamentarian struck all three under the Byrd Rule, and the final signed law contains none of them. Source: NARFE, GovExec, and FedWeek reporting from June-July 2025.

The only federal workforce provision that survived: an OPM authorization to audit FEHB dependent eligibility (ineligible dependents).

The $6,000 Senior Deduction: How It Actually Works

This is the highest-impact new provision for federal retirees. The deduction sits on top of every other deduction you already get.

Stacking math for a 65+ MFJ couple (both spouses 65+):

• Enhanced standard deduction: $31,500
• Existing age-based additional deduction: $2,600 ($1,300 per spouse)
• New OBBBA senior deduction: $12,000 ($6,000 per spouse)
• Total income shielded: $46,100

This works even if you itemize. You take itemized deductions plus the $12,000 senior deduction, not standard plus itemized.

Phase-out mechanics for a single 65+ retiree:

MAGI	Reduction (6% of excess over $75K)	Remaining Senior Deduction	Tax Savings at 22%
$75,000	$0	$6,000	$1,320
$100,000	$1,500	$4,500	$990
$125,000	$3,000	$3,000	$660
$150,000	$4,500	$1,500	$330
$175,000	$6,000	$0	$0 (gone)

For MFJ where one spouse is 65+: phase-out starts at $150,000 MAGI and the $6,000 deduction is fully eliminated at $250,000.

For MFJ where both spouses are 65+: phase-out on the combined $12,000 starts at $150,000 and is fully eliminated at $350,000 MAGI.

The MAGI calculation includes everything federal retirees draw on: FERS or CSRS annuity income, traditional TSP RMDs, Social Security benefits, capital gains, even tax-exempt municipal bond interest. A GS-13 retiree with a $60,000 FERS annuity plus $30,000 Social Security plus a $30,000 TSP RMD is at $120,000 MAGI, putting them well into the phase-out range as a single filer.

This is why the calculation matters. Many federal retirees who assume they will get the full $6,000 actually qualify for less.

Run your own retirement income stack through the FERS Retirement Calculator to see where you land in the phase-out before adjusting any withholding.

Original Data: OBBBA Tax Savings by GS Grade

Below is the FedTools scenario table no other federal employee outlet has published. Estimates assume single filer (unless noted), federal tax only, standard deduction, Washington DC locality at 2026 OPM rates.

2026 GS Step 5 DC pay used:

• GS-9: $80,334
• GS-11: $97,102
• GS-13: $138,024
• GS-15: $192,287 (before pay cap; cap is $197,200)

Profile	Gross Pay / MAGI	Age	Primary OBBBA Benefit	Est. Annual Federal Tax Savings
GS-9 Step 5 DC, single	$80,334	<50	Permanent brackets + enhanced standard deduction	~$1,800-$2,400
GS-11 Step 5 DC, single	$97,102	<50	Same; partial IRA deduction loss at this income	~$2,000-$2,600
GS-13 Step 5 DC, single	$138,024	<50	Brackets permanent; no IRA deduction; SALT useful	~$2,400-$3,200
GS-15 Step 5 DC, single	$192,287	<50	Brackets permanent; no IRA deduction; SALT useful	~$3,200-$4,000
GS-13 Step 5 DC, single	$138,024	50-64	Mandatory Roth catch-up applies (earned >$145K in 2025)	~$2,400-$3,200
Retiree, single, MAGI	$80,334	65-67	Full $6,000 senior deduction (partial reduction ~$4,800)	~$2,900-$3,700
Retiree, single, MAGI	$138,024	65-67	Senior deduction nearly phased out (~$2,200 left)	~$2,900-$3,400
Retiree, single, MAGI	$192,287	65-67	Senior deduction fully phased out (gone at $175K)	~$3,200-$4,000 (brackets only)
Retiree MFJ both 65+, MAGI	$138,024	68+	Full $12,000 deduction (phase-out starts $150K, not yet hit)	~$5,400-$6,800
Retiree MFJ both 65+, MAGI	$192,287	68+	$9,463 remaining after $2,537 phase-out reduction	~$5,600-$7,000

Ranges reflect itemizing versus standard deduction and state tax treatment. These are illustrative federal-only estimates, not tax advice.

The IRMAA Trap for TSP-Heavy Retirees

The OBBBA does not change IRMAA brackets. But it does interact with retirement planning in a way most federal retirees miss.

2026 IRMAA brackets (based on 2024 MAGI):

2024 MAGI (Single)	2024 MAGI (MFJ)	Part B Surcharge	Part D Surcharge	Annual Add'l Cost (Part B+D, Single)
≤$109,000	≤$218,000	$0	$0	$0
$109,001-$137,000	$218,001-$274,000	$81.20	$14.50	$1,164
$137,001-$171,000	$274,001-$342,000	$202.90	$37.50	$2,883
$171,001-$205,000	$342,001-$410,000	$324.60	$60.40	$4,621
$205,001-$499,999	$410,001-$749,999	$446.30	$83.30	$6,354
≥$500,000	≥$750,000	$487.00	$91.00	$6,936

The TSP Roth conversion trap. Federal retirees doing in-plan Roth conversions starting January 28, 2026 should remember the two-year IRMAA lookback. A $50,000 Roth conversion in 2026 inflates 2026 MAGI, which feeds 2028 IRMAA. A retiree at $200,000 MAGI doing that conversion could move from Tier 1 to Tier 2 IRMAA, adding roughly $1,164 per year in Medicare premiums for that year, partially offsetting the long-term Roth conversion benefit.

The senior deduction does not help. It reduces taxable income but not MAGI. IRMAA is calculated on MAGI. So a $50,000 Roth conversion at age 67 still triggers IRMAA, even though the $6,000 senior deduction reduces taxable income on the conversion year.

Model conversion scenarios with the TSP Calculator and stack the result against your full retirement income to see the IRMAA effect.

Federal Law Enforcement and the Overtime Deduction

Most GS professional employees are FLSA-exempt and do not qualify for the new overtime deduction. Federal law enforcement officers (LEOs) and some technical positions are the exception worth examining.

Quick eligibility check:

• SF-50 Block 35: "N" = FLSA nonexempt = potentially eligible.
• FLSA Section 7(k) covers law enforcement with alternative work periods. Overtime is calculated differently but is still FLSA-required.

Open question on AUO (Administratively Uncontrollable Overtime): AUO under 5 USC 5545(c)(2) is a separate statutory pay authority, not FLSA-required overtime. As of this writing, the IRS has not issued specific guidance on whether AUO qualifies for the deduction. LEAP (Law Enforcement Availability Pay) under 5 USC 5545a is similarly ambiguous. If you receive AUO or LEAP, document the FLSA classification on your SF-50 and consult a CPA familiar with federal law enforcement pay before claiming the deduction.

Sample calculation for an eligible fed:

• GS-9 LEO in DC: $80,334 base pay, $4,000 in FLSA overtime premium.
• Deduction: $4,000 (below the $12,500 cap).
• Income threshold: $80,334 (well below the $150,000 phase-out start).
• Tax savings at 22% bracket: ~$880.

Starting on 2026 W-2s, employers are required to report qualified overtime separately in Box 12 with Code "TT," which will simplify the claim.

SALT Cap Change for DMV Feds

The SALT cap rising from $10,000 to $40,000 ($40,400 in 2026 with the 1% index) is most valuable to federal employees who itemize and live in high-tax jurisdictions. Below the $40,000 cap, you can deduct your full state income tax plus property tax. Above $40,000, you are still capped, but the cap is now four times higher.

Sample for a GS-13 Step 5 DC metro fed, married, itemizing:

• State and local income tax: ~$12,000
• Property tax: ~$8,000
• Total SALT: $20,000
• Old cap: $10,000 deductible
• OBBBA cap: $20,000 deductible (full amount, under the $40,000 ceiling)
• Extra federal deduction: $10,000
• Federal tax savings at 22% bracket: ~$2,200

State conformity is the catch. Federal SALT relief is one thing. State returns can decouple.

State	OBBBA Conformity Status (2026)	Impact for DMV Feds
Virginia	Decoupled. Static conformity to December 31, 2025 IRC. OBBBA personal deductions do NOT apply on Virginia returns through at least 2026.	Federal benefit only. No Virginia state benefit from the same law.
Maryland	Decoupled for 2025. Conditional conformity for 2026 absent further legislation. 2026 session is the key event.	Watch for state legislative action. Do not assume deductions flow through.
DC	DC Council proposed decoupling. Congress intervened and overturned. Legal uncertainty remains.	Federal benefit applies. DC state benefit is contested.

For most DMV feds, the OBBBA is a federal-only tax cut, not a state one. Plan accordingly.

TSP Mechanics Under OBBBA

OBBBA itself does not change TSP rules. The TSP changes happening in 2026 are SECURE 2.0 implementations and FRTIB feature launches, not OBBBA provisions. But they interact with OBBBA in ways worth flagging.

TSP in-plan Roth conversion (January 28, 2026 onward). Active employees and separated participants can convert traditional TSP to Roth TSP with a $500 minimum per transaction. The TSP does not withhold federal taxes on the conversion. You pay the bill from outside funds. The conversion is fully taxable as ordinary income in the year of conversion. Higher MAGI in that year can:

• Trigger or worsen IRMAA two years later.
• Erode the senior deduction (if 65+ or turning 65 in that year).
• Push more Social Security into the taxable range.

Mandatory Roth catch-up for high earners (SECURE 2.0). GS-13/14/15 employees who earned more than $145,000 in 2025 must direct their 2026 catch-up contributions (ages 50+) to the Roth TSP. This is not OBBBA. But it affects the same high-earning population making OBBBA decisions.

RMD ages unchanged. Age 73 for those born 1951-1959, age 75 for those born 1960 or later. 2026 RMDs are based on December 31, 2025 TSP balances, which reflect strong 2024 and 2025 market gains. Many C and S fund holders will see larger-than-expected RMDs that count toward the senior deduction MAGI phase-out.

For Roth conversion strategy specifically, see our companion post on the Roth TSP Conversion Tax Trap, which covers the timing decisions in more detail.

What to Do Right Now (Action Items by Audience)

If you are a working federal employee under 65:

• Review your W-4 (MyPay for civilians). Withholding tables updated January 1, 2026. If your situation changed, file an updated W-4.
• If you are FLSA-nonexempt (SF-50 Block 35 = "N") and receive overtime, your W-2 will report qualified overtime in Box 12 Code "TT" starting 2026. You can claim the deduction at filing.
• If you earned more than $145,000 in 2025 and are 50+, your 2026 catch-up TSP contributions must go to the Roth side.

If you are a federal retiree 65 or older:

• Submit Form W-4P to OPM to adjust withholding for the senior deduction (if your MAGI stays under the phase-out). OPM defaults to single/zero-allowance.
• Model your full income stack against the phase-out to determine whether you get $6,000, a partial amount, or nothing.
• If considering a Roth TSP conversion, remember the 2-year IRMAA lookback. Conversions in 2026 hit 2028 IRMAA.

If you live in Virginia, Maryland, or DC:

• Do not assume the senior deduction or SALT expansion flows to your state return automatically. Check current state legislative status before adjusting state withholding.

If you are a federal LEO with AUO or LEAP:

• Track your FLSA classification and consult a CPA familiar with federal law enforcement pay. The overtime deduction's application to AUO is not yet clarified by IRS guidance.

What Happens After 2028 and 2029

OBBBA's temporary provisions sunset on specific dates:

• December 31, 2028: Senior deduction expires. Overtime deduction expires. Tip deduction expires. Auto loan interest deduction expires.
• December 31, 2029: SALT $40,000 cap reverts to $10,000.
• Permanent indefinitely: TCJA brackets, enhanced standard deduction, child tax credit at $2,200, $15M+ estate exemption.

Planning implication for federal employees nearing retirement. If you have flexibility on your retirement date, retiring while the temporary deductions are in effect (2025-2028) and using the FERS Retirement Calculator to model your income stacking against the senior deduction phase-out may identify an optimal window. The deductions stack on the standard deduction and apply for the year you turn 65, not the year after.

Calculate Your OBBBA Impact

Run your specific scenario before adjusting any tax decisions:

• FERS Retirement Calculator: Stack FERS annuity, Social Security, and TSP withdrawals to see where your MAGI lands relative to the senior deduction phase-out.
• TSP Calculator: Model Roth conversion scenarios and the resulting MAGI spike that feeds IRMAA two years later.
• High-3 Calculator: Confirm your High-3 has not changed under OBBBA (it has not, but verifying your current grade and step matters for retirement income modeling).

Frequently Asked Questions

What does the One Big Beautiful Bill Act mean for my taxes as a federal employee in 2026?

The OBBBA primarily makes permanent the lower tax rates from the 2017 Tax Cuts and Jobs Act that were set to expire. For most working federal employees, this means no bracket hike in 2026. New additions include the $6,000 senior deduction for ages 65+ (available 2025-2028), the SALT cap rising to $40,000, and an overtime deduction for FLSA-eligible workers. The feared cuts to FERS benefits, the FERS Supplement, and High-3 calculation were all removed before the bill was signed.

Does the FERS Supplement get eliminated under the OBBBA?

No. The House-passed version of H.R. 1 included a provision to eliminate the supplement starting January 1, 2028. The Senate stripped it before final passage. President Trump signed the bill without that provision. The FERS Special Retirement Supplement is intact under current law for all eligible retirees under age 62.

How much can a federal retiree save with the $6,000 OBBBA senior deduction?

Up to about $1,320 per year if single at the 22% bracket with the full $6,000 deduction, or up to $2,640 per year if both spouses are 65+ and filing MFJ. The deduction is temporary (2025-2028) and phases out starting at $75,000 MAGI (single) or $150,000 MAGI (joint). FERS retirees with FERS annuity plus Social Security plus TSP RMDs often land in the partial phase-out range.

Do federal employees get the OBBBA overtime tax deduction?

Only if you are FLSA-nonexempt. Check SF-50 Block 35: "N" means nonexempt and potentially eligible. Most GS professional and managerial positions are FLSA-exempt and do not qualify, even if they work over 40 hours per week. Federal law enforcement officers covered under FLSA Section 7 may qualify for their FLSA overtime premium. AUO (Administratively Uncontrollable Overtime) under 5 USC 5545(c)(2) is a separate pay authority, and IRS guidance does not yet clarify whether AUO qualifies for the deduction.

Can I now do a Roth conversion inside my TSP under OBBBA?

Yes, but the in-plan Roth conversion feature is a separate TSP change (effective January 28, 2026), not an OBBBA provision. You can convert traditional TSP to Roth TSP with a $500 minimum per transaction. The full converted amount is ordinary income in the year of conversion. The TSP does not withhold taxes, so you must pay the bill from outside funds. Conversions inflate your MAGI for that year, which can trigger IRMAA surcharges two years later and erode the senior deduction if you are 65+.

I am a GS-13 in Virginia. Does the OBBBA SALT increase help me?

At the federal level, yes. SALT is now capped at $40,000 instead of $10,000, so if your combined state and local taxes exceed $10,000, you can deduct more. A GS-13 with $20,000 in state and property taxes saves roughly $2,200 at the 22% federal bracket. However, Virginia decoupled from OBBBA personal provisions for 2025 and 2026 tax years. Virginia state returns will not reflect OBBBA-based deductions without separate Virginia legislation.

Does the senior deduction reduce IRMAA?

No. The deduction reduces taxable income but not the MAGI figure Medicare uses to calculate IRMAA surcharges. IRMAA for 2026 uses 2024 MAGI. The senior deduction sits at the taxable-income layer, not the MAGI layer.

What happens to these OBBBA deductions after 2028?

The senior deduction, overtime deduction, tip deduction, and auto loan interest deduction all expire December 31, 2028 unless Congress acts. The SALT $40,000 cap expires December 31, 2029. Permanent provisions: TCJA brackets (10%-37%), enhanced standard deduction, child tax credit at $2,200, and the $15M+ estate exemption.

Related Resources

• Trump Accounts $1,000 Baby Bonus for Federal Employees: Section 530A of OBBBA, the federal seed deposit for children born 2025-2028.
• Roth TSP Conversion Tax Trap 2026: Conversion timing decisions and IRMAA lookback math.
• Tax Planning for Federal Retirees 2026: Broader retiree tax strategy beyond OBBBA.
• FERS Annuity Tax Guide 2026: How the FERS annuity is taxed and the Simplified Method exclusion ratio.
• TSP vs Roth IRA Tax Diversification: Pre-tax versus Roth balance strategy.
• State of Federal Pay 2026: GS pay tables, locality differentials, and the $197,200 pay cap.

Sources

• IRS: One Big Beautiful Bill Provisions
• IRS: Tax Deductions for Working Americans and Seniors
• IRS Q&A: New Deduction for Qualified Overtime Compensation
• NARFE: Federal Workforce Provisions Dropped from H.R. 1
• GovExec: All Federal Worker Provisions Stricken from Reconciliation Package
• MyFederalRetirement: How OBBBA Affects Federal Employees and Retirees
• FedWeek: Top 10 OBBBA Provisions for Federal Employees
• EP Wealth: TSP In-Plan Roth Conversions in 2026
• Federal Pension Advisors: 2026 IRMAA Brackets
• Carry: Virginia Static Tax Conformity Decoupling