OBBBA + TCJA 2026: post-sunset reality for typical filers

The One Big Beautiful Bill Act, signed by the President on July 4, 2025, is the most consequential US federal tax legislation since the Tax Cuts and Jobs Act of 2017. The Act addressed the scheduled December 31, 2025 sunset of TCJA provisions by making the majority of individual income tax provisions permanent rather than allowing reversion to pre-2018 framework.

Provisions made permanent. The seven TCJA tax brackets (10, 12, 22, 24, 32, 35, 37 percent) are now permanently locked at the structure introduced in 2018, with annual inflation indexing continuing. The standard deduction at TCJA-era levels is permanent ($16,100 single and $32,200 MFJ for 2026 per IRS Rev. Proc. 2025-32). Section 199A Qualified Business Income deduction (cross-link Post #1 Batch 11) is permanent with a new $400 minimum deduction floor and expanded phase-out thresholds. The personal exemption remains at zero (TCJA elimination made permanent rather than allowed to revert to approximately $5,000 per person).

Provisions modified. Child Tax Credit raised from $2,000 to $2,200 per qualifying child, permanently inflation-indexed. SALT deduction cap raised from $10,000 to $40,000 for tax years 2025 through 2029, with high-income phase-down and reversion to $10,000 after 2029. Estate and gift tax exemption raised to $15 million per individual / $30 million MFJ permanently beginning 2026, inflation-indexed from 2027.

Provisions retained from TCJA structure. Mortgage interest deduction loan principal cap at $750,000 (TCJA-era figure continued). Alternative Minimum Tax exemption structure with TCJA expansion continued. Net Investment Income Tax thresholds ($200,000 single / $250,000 MFJ MAGI) unchanged. Qualified dividend and long-term capital gains rate structure (0, 15, 20 percent based on income) continued.

Practical implication. The "TCJA sunset" narrative that dominated US tax media from approximately 2023 through mid-2025 is structurally obsolete. Articles written before July 4, 2025 that predict 2026 reversion to higher rates, lower standard deduction, lower Child Tax Credit, and lower estate exemption are inaccurate for Q1-Q2 2026 reality. Cached advice from 2023-2024 should be verified against OBBBA-updated provisions before applying to current-year tax planning. The 2026 tax environment is a stable continuation of 2018-2025 TCJA-era structure rather than a reversion to pre-2018 framework — a critical mental model correction for filers, tax preparers, and financial planners.

IRS Revenue Procedure 2025-32 set the 2026 tax brackets and standard deduction amounts per the OBBBA permanence framework plus annual inflation adjustments.

Tax brackets 2026 — single filer.

• 10 percent: $0 to $11,925
• 12 percent: $11,925 to $48,475
• 22 percent: $48,475 to $103,350
• 24 percent: $103,350 to $197,300
• 32 percent: $197,300 to $250,525
• 35 percent: $250,525 to $626,350
• 37 percent: above $626,350

Tax brackets 2026 — married filing jointly.

• 10 percent: $0 to $23,850
• 12 percent: $23,850 to $96,950
• 22 percent: $96,950 to $206,700
• 24 percent: $206,700 to $394,600
• 32 percent: $394,600 to $501,050
• 35 percent: $501,050 to $751,600
• 37 percent: above $751,600

Standard deduction 2026.

• Single: $16,100
• Head of household: $24,150
• Married filing jointly: $32,200
• Senior additional (age 65 plus): $2,050 single / $1,650 per qualifying spouse joint
• Blind additional: same amounts as senior

Worked example: single filer $100,000 gross income 2026.

• Gross income: $100,000
• Standard deduction: $16,100
• Taxable income: $83,900
• Tax calculation:

- 10 percent × $11,925 equals $1,192.50

- 12 percent × ($48,475 minus $11,925) equals $4,386.00

- 22 percent × ($83,900 minus $48,475) equals $7,793.50

- Total federal income tax: $13,372.00

• Marginal rate: 22 percent
• Effective rate: approximately 13.4 percent

Comparison: same scenario under pre-2018 framework (hypothetical reversion that did not occur).

If TCJA had sunset as originally scheduled, brackets would have reverted to 10/15/25/28/33/35/39.6 percent and standard deduction to approximately $8,000 single. The same $100,000 gross income would have produced taxable income approximately $92,000 with federal income tax approximately $17,500 — roughly $4,100 higher than post-OBBBA reality. The "TCJA sunset penalty" of approximately $4,000 for typical single filer is the math that did not materialize because OBBBA preserved the TCJA structure.

Marginal versus effective rate distinction matters for planning. Marginal rate (22 percent for the example filer) applies to the next dollar earned. Effective rate (approximately 13 percent) is the total tax divided by total income. For tax planning decisions involving incremental income (overtime, side income, capital gains, retirement withdrawals), the marginal rate is the operational rate. For overall financial health assessment, the effective rate provides truer picture of tax burden.

OBBBA raised the state and local tax (SALT) deduction cap from the TCJA $10,000 limit to $40,000 for tax years 2025 through 2029, with high-income phase-down and reversion to $10,000 after 2029. This is the most consequential change for itemizers in high-tax states.

SALT cap mechanics 2025-2029. Filers with modified adjusted gross income at or below $500,000 receive the full $40,000 SALT cap. Above $500,000 MAGI, the cap phases down by 30 percent of MAGI exceeding the threshold, until the cap reaches the $10,000 floor. The cap and the $500,000 threshold both increase 1 percent annually through 2029. After 2029, the cap reverts to $10,000 unless extended by future legislation.

Itemize versus standard deduction math 2026. Single filer with $20,000 state income tax plus $8,000 property tax plus $5,000 mortgage interest plus $3,000 charitable contributions equals $36,000 itemized total. Under TCJA $10,000 SALT cap, the deductible portion would have been $5,000 (mortgage) plus $3,000 (charitable) plus $10,000 (capped SALT) equals $18,000 itemized. Compared to standard deduction $16,100 for 2026, the itemized total of $18,000 marginally exceeded standard. Under OBBBA $40,000 SALT cap, the same itemized total becomes $5,000 plus $3,000 plus $28,000 equals $36,000 itemized. Itemizing now produces approximately $20,000 additional deduction vs standard, with federal tax savings of $4,400 at 22 percent marginal rate.

High-tax states materially affected. Filers in California, New York, New Jersey, Oregon, Minnesota, Massachusetts, and other states with combined state plus local income tax above 8 percent plus moderate property tax routinely accumulated $20,000-$50,000+ SALT before the $10,000 cap. Restoration of meaningful SALT deduction (within $40,000 cap) restores material tax benefit for these filers.

High-income phase-down example. Filer with $700,000 MAGI: MAGI exceeds $500,000 threshold by $200,000. SALT cap reduction: 30 percent × $200,000 equals $60,000 reduction from the $40,000 cap. Since the reduction exceeds the $40,000 cap, the cap floors at $10,000. For MAGI between $500,000 and approximately $600,000, the cap phases down proportionally between $40,000 and $10,000.

Strategic implications. Itemizers in high-tax states should reassess itemize versus standard deduction decision Q1-Q2 2026 with $40,000 cap. Pass-through entity tax election (state-level workaround that some states adopted post-TCJA) may become less relevant for moderate-income filers but remains material for filers above $500,000 MAGI phase-down. State-level tax planning interacts with federal SALT cap restoration in ways that require state-specific analysis.

Post-2029 reversion risk. SALT cap returns to $10,000 in 2030 unless extended. Filers planning multi-year strategies (timing of state tax payments, property tax prepayment, charitable contribution bunching) should consider the 2029 cliff date.

OBBBA raised the Child Tax Credit (CTC) from the TCJA $2,000 per qualifying child to $2,200 per qualifying child, with permanent inflation indexing applied annually. Phase-out thresholds remain at $200,000 modified adjusted gross income for single filers and $400,000 MAGI for married filing jointly.

CTC mechanics 2026. Qualifying child requirements: under age 17 at end of tax year, US citizen or resident alien, claimed as dependent on filer return, lived with filer more than half the year, did not provide more than half of own support, has a valid Social Security number. Each qualifying child reduces tax liability by $2,200, dollar for dollar. Above the phase-out thresholds, the credit reduces by $50 for each $1,000 of MAGI above the threshold. Full phase-out occurs at approximately $240,000 MAGI single (one child) and $440,000 MFJ (one child); higher MAGI for multiple children.

Refundable portion (Additional Child Tax Credit). Up to $1,700 of the $2,200 CTC is refundable for 2026 as the Additional Child Tax Credit, meaning filers with insufficient tax liability to absorb the full $2,200 can receive the refundable portion as a tax refund. The refundable amount is calculated as 15 percent of earned income above $2,500.

Credit for Other Dependents (ODC). Filers with dependents who do not qualify for CTC (older children, qualifying relatives, parents claimed as dependents) may qualify for the $500 nonrefundable Credit for Other Dependents per qualifying individual. Phase-out at the same MAGI thresholds as CTC.

Multi-child family example. MFJ filer with three qualifying children under 17 and MAGI $350,000: CTC calculation 3 × $2,200 equals $6,600. MAGI is below $400,000 phase-out threshold, so no reduction applies. Federal tax liability reduced by $6,600 dollar for dollar. Compared to TCJA $2,000 per child level: 3 × $2,200 minus 3 × $2,000 equals $600 additional benefit annually from the OBBBA increase, with continued inflation indexing.

Phase-out example. Single filer with one qualifying child and MAGI $215,000: MAGI exceeds $200,000 by $15,000. CTC reduction 15 × $50 equals $750. Remaining CTC: $2,200 minus $750 equals $1,450.

Comparison to pre-OBBBA reality. If TCJA had sunset as originally scheduled, CTC would have reverted to $1,000 per qualifying child with lower phase-out thresholds ($75,000 single / $110,000 MFJ pre-2018). The same three-child family at $350,000 MAGI would have lost CTC entirely under pre-2018 framework. The OBBBA preservation of the higher CTC plus elevated phase-outs preserves approximately $5,000-$6,600 annual benefit for the example family that would otherwise have been lost.

OBBBA permanently increased the federal estate, gift, and generation-skipping transfer (GST) tax exemptions to $15 million per individual and $30 million per married couple (with portability) beginning in 2026, inflation-indexed from 2027.

Background context. TCJA had raised the exemption from approximately $5.5 million per individual (2017) to approximately $13.61 million per individual (2024), with scheduled reversion to approximately $7 million per individual beginning 2026 under the TCJA sunset. The expected reversion drove an estate planning rush among high-net-worth families through 2024-2025 — gifting strategies, irrevocable trust formation, life insurance trust funding — to lock in the higher TCJA exemption before sunset. OBBBA eliminated the reversion and increased the exemption further to $15 million.

Practical implications for high-net-worth planning. Families with combined estate values below $30 million MFJ generally face no federal estate tax exposure under OBBBA. Families with estates between $30 million and $60 million face exposure on the excess, with federal estate tax rate at 40 percent of the taxable estate. Families above $60 million MFJ have material federal estate tax exposure regardless of OBBBA framework.

Lifetime gifting strategy continuity. Gifting strategies that were urgent under TCJA sunset uncertainty are no longer time-pressured. Annual exclusion gifting ($19,000 per recipient per donor for 2026 per IRS Rev. Proc. 2025-32) continues independently of lifetime exemption. Lifetime taxable gifts that exceed the annual exclusion use the lifetime exemption, but the $15 million exemption provides substantial planning room before federal gift tax exposure.

Portability mechanics. Married couples can use portability (formally Deceased Spousal Unused Exclusion Amount, DSUEA) to combine both spouses' exemptions. If first spouse dies in 2026 and uses only $5 million of $15 million exemption, the unused $10 million can be ported to surviving spouse via timely-filed Form 706 estate tax return, increasing surviving spouse exemption to $25 million ($15 million + $10 million ported).

State-level estate tax interaction. Several states (Connecticut, Hawaii, Illinois, Maine, Maryland, Massachusetts, Minnesota, New York, Oregon, Rhode Island, Vermont, Washington, plus DC) impose state-level estate or inheritance tax with thresholds frequently lower than federal $15 million. State estate tax planning continues independently of OBBBA federal changes. Filers in state-tax states should verify state-specific exemption thresholds and rates separately from federal.

Generation-skipping transfer (GST) exemption. OBBBA harmonized the GST exemption with the estate and gift exemption at $15 million per individual / $30 million MFJ. Generation-skipping trusts (dynasty trusts, grandchild trusts) benefit from the same exemption framework, eliminating prior GST/estate exemption divergence concerns.

Four filer categories experience material planning changes post-OBBBA. Filers outside these categories face essentially unchanged tax structure between 2024 and 2026.

Category 1: High-income pass-through business owners. Section 199A QBI deduction permanence (cross-link Post #1 Batch 11) eliminates planning uncertainty for sole proprietors, single-member LLCs, partnerships, and S-corporation owners. Multi-year structural decisions (entity formation, S-corp election versus sole proprietorship, partnership formation, retirement contribution strategy through SEP-IRA or Solo 401(k)) can now assume continued Section 199A availability indefinitely. The 20 percent deduction provides material federal tax reduction within phase-out thresholds ($201,750 single / $403,500 MFJ for 2026), with W-2 wage and unadjusted basis limitations above thresholds for non-SSTB businesses.

Category 2: High-net-worth families with estate exposure $5-30 million. Estate, gift, and GST exemption permanence at $15 million per individual / $30 million MFJ eliminates the planning rush that drove 2024-2025 acceleration of gifting and irrevocable trust formation. Families with estates in the $5-30 million range previously faced choice between using TCJA-era exemption before sunset versus risking pre-2018 reversion. Post-OBBBA, the strategic decision becomes less time-pressured. Multi-year wealth transfer strategies (intentionally defective grantor trusts, grantor retained annuity trusts, charitable lead annuity trusts) can extend over longer planning horizons.

Category 3: High-tax state residents in California, New York, New Jersey, Oregon, Minnesota, Massachusetts. SALT deduction cap raise from $10,000 to $40,000 for 2025-2029 materially changes itemize-versus-standard-deduction math for filers with state income plus property tax exceeding $10,000. Pass-through entity tax election (state-level SALT workaround that approximately 30 states adopted post-TCJA) may become less relevant for moderate-income filers but remains material above $500,000 MAGI phase-down threshold. Multi-year tax planning should account for post-2029 cap reversion to $10,000 unless extended.

Category 4: Self-employed considering W-2 transition or vice versa. Section 199A QBI permanence (Category 1 overlap) combined with retirement contribution capacity advantages (Solo 401(k) vs W-2 401(k)) creates more stable framework for transition planning. Cross-link Post #1 Batch 11 decision framework. Health insurance access reality post-ACA enhanced subsidy expiration (cross-link Post #3 Batch 10) remains material consideration independent of OBBBA changes.

Filers outside these four categories — typical W-2 worker with standard deduction, no pass-through business income, MAGI below $500,000, no estate exposure above $5 million — experience essentially unchanged tax structure between 2024 and 2026. The "TCJA sunset" narrative that drove anxiety in 2023-2025 was structurally averted by OBBBA for the majority of filers.

OBBBA provisions affect multiple posts in the Batch 11 cluster and connect with prior batches via cross-cluster integration.

Post #1 Batch 11 (W-2 vs 1099 self-employed tax). Section 199A QBI permanence is the central OBBBA discovery from Post #1. The math comparison between W-2 employment and 1099 self-employment becomes structurally clearer once the QBI deduction is locked permanently rather than facing 2026 sunset uncertainty. Pass-through entity decisions (sole proprietorship versus single-member LLC versus S-corp election) can use multi-year planning horizon.

Post #3 Batch 11 forthcoming (Roth IRA vs Traditional 401(k)). OBBBA preserved TCJA-era tax brackets, which affects the marginal-rate-now versus marginal-rate-in-retirement comparison central to Roth versus Traditional decision. Filers expecting brackets to revert to pre-2018 levels in retirement (which would have favored Traditional deductions now to take tax bite at lower future rates) now face stable bracket continuation.

Post #4 Batch 11 forthcoming (Capital Gains Tax Strategy). OBBBA preserved long-term capital gains rate structure (0/15/20 percent based on income). Net Investment Income Tax thresholds ($200,000 single / $250,000 MFJ MAGI) unchanged. Capital gains planning continues independent of bracket changes for ordinary income.

Post #5 Batch 11 forthcoming (Self-Employed Quarterly Estimated Tax). OBBBA-updated brackets and standard deduction affect safe harbor calculations for quarterly estimated payments. 1099 workers using prior-year safe harbor (100 percent of prior year tax, or 110 percent if AGI exceeds $150,000) should verify quarterly payment amounts reflect post-OBBBA bracket continuation rather than anticipated TCJA sunset reversion.

Cross-batch: Batch 8 paycheck-calculator-2026. W-2 withholding for 2026 uses post-OBBBA brackets and standard deduction. Filers who adjusted Form W-4 in late 2025 in anticipation of TCJA sunset may have over-withheld; review W-4 against current IRS Withholding Estimator.

Cross-batch: Batch 8 retirement vertical. OBBBA generally preserved retirement contribution limits and structure. Annual IRS Notice releases adjusted limits for 2026 (validate via IRS Notice). Roth IRA income phase-out continues with inflation indexing. Backdoor Roth IRA strategy remains available.

Cross-batch: Batch 10 health insurance. ACA enhanced premium tax credit expiration (December 31, 2025) is independent of OBBBA — Lower Health Care Costs Act (S 3385) failed in the Senate prior to OBBBA, and OBBBA did not include ACA subsidy extension. Health insurance access reality Q1-Q2 2026 reflects expiration impact (+114 percent average subsidized premium per KFF) separately from OBBBA tax framework changes.

Q1-Q2 2026 tax planning requires post-OBBBA mental model. Cached 2024 advice and pre-July 2025 aggregator content is structurally outdated for federal income tax provisions covered by OBBBA. State-level provisions and non-tax federal regulations (ACA, retirement plan rules, social security) require separate verification.

Q1-Q2 2026 tax planning under post-OBBBA framework follows a structured sequence.

Step 1: Verify which OBBBA-affected provisions apply to your filer profile. Pass-through business income (Section 199A QBI, permanent). High SALT burden (cap $40,000 for 2025-2029). Estate exposure (exemption $15M/$30M permanent 2026). Standard wage with standard deduction (bracket and standard deduction permanence). Dependents (CTC raised to $2,200).

Step 2: Calculate 2026 federal tax with current IRS Rev. Proc. 2025-32 brackets and standard deduction. Single filer $100,000 example: approximately $13,372 federal income tax with standard deduction $16,100 producing taxable income $83,900. Compare effective rate against prior years for trajectory awareness.

Step 3: Assess itemize versus standard deduction with $40,000 SALT cap. Itemizers with state income tax plus property tax exceeding $10,000 should recalculate Schedule A with the post-OBBBA cap. High-tax state residents in CA, NY, NJ, OR, MN, MA frequently benefit from itemizing post-OBBBA where standard deduction was previously dominant.

Step 4: For pass-through business owners, apply Section 199A QBI deduction. 20 percent of qualified business income, with phase-outs at $201,750 single / $403,500 MFJ for 2026. Minimum $400 deduction floor for QBI of at least $1,000 with material participation. Cross-link Post #1 Batch 11 for full mechanics.

Step 5: For families with dependents, apply Child Tax Credit $2,200 per qualifying child plus Credit for Other Dependents $500 for non-CTC dependents. Phase-out at $200,000 single / $400,000 MFJ MAGI. Refundable portion up to $1,700 per child.

Step 6: For high-net-worth families, coordinate federal exemption $15M/$30M with state estate tax planning. State estate tax thresholds (where applicable) operate separately from federal exemption. Multi-year wealth transfer strategies (annual exclusion gifting at $19,000 per recipient per donor for 2026, lifetime taxable gifting using federal exemption) benefit from OBBBA permanence horizon.

1099 self-employed filers who use the safe harbor strategy for quarterly estimated payments should adjust calculations to reflect post-OBBBA brackets and standard deduction. The adjustment affects 2026 quarterly payment amounts.

Safe harbor recap. Avoid underpayment penalty by paying at least 90 percent of current year tax liability OR 100 percent of prior year tax liability (110 percent if AGI exceeded $150,000 in prior year) through combined withholding and estimated payments. 2026 quarterly deadlines: April 15, June 15, September 15 of 2026, and January 15 of 2027.

Pre-OBBBA forecasting issue. Filers forecasting 2026 tax liability in late 2024 or early 2025 may have assumed TCJA sunset reversion to pre-2018 brackets, leading to higher estimated quarterly payments. Post-OBBBA reality preserves TCJA-era brackets, so the higher payments produce overpayment relative to actual 2026 liability. Filers in this situation can reduce remaining 2026 quarterly payments to match actual post-OBBBA liability estimate.

Post-OBBBA forecasting framework. Calculate 2026 estimated liability using IRS Rev. Proc. 2025-32 brackets and standard deduction. For pass-through business owners, apply Section 199A QBI deduction. For high-tax state itemizers, apply $40,000 SALT cap. For families with dependents, apply $2,200 CTC per qualifying child. Sum federal income tax plus Schedule SE self-employment tax (validate FICA wage base $184,500 from Post #1 Batch 11) plus state income tax. Divide by four quarterly payments.

Form 1040-ES adjustment. Filers can adjust Form 1040-ES estimated payments at any quarter without IRS notification — payments are voluntary in the sense that no quarterly minimum is required, only that the cumulative payments meet safe harbor by year-end. Reducing Q3 or Q4 2026 payments to balance previously-overpaid Q1 and Q2 amounts is acceptable. Underpayment penalty is calculated per quarter, but excess Q1-Q2 payments cover Q3-Q4 shortfall without separate penalty.

Cross-link Post #5 Batch 11 forthcoming. Detailed quarterly estimated tax mechanics, safe harbor strategy, and underpayment penalty calculation covered in Post #5. Q1-Q2 2026 transition guidance available for filers adjusting from pre-OBBBA assumptions to current reality.