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How to calculate the new alternative minimum tax under OBBBA

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The alternative minimum tax represents one potential caveat to the widespread and, mostly, correct belief that the One Big Beautiful Bill Act cut everyone’s payments to Uncle Sam.

Below are five key questions for financial advisors, tax professionals and clients to help them understand their potential AMT exposure. OBBBA tweaked the rules in ways that will hike the number of households subject to it. 

The level of liability will not reach the days before the Tax Cuts and Jobs Act of 2017. However, the adjustments may prompt some clients to speed up their collection of certain income to this year, rather than waiting until it could bring higher taxes in 2026 or beyond.

For example, the rising deduction for state and local taxes under OBBBA will indeed reduce federal income liabilities in the traditional or basic system for households in high-tax areas in places like New York, Chicago and Los Angeles. But the AMT brings an alternative set of rules that add items like those hotly debated SALT breaks of up to $40,000 and the standard deduction back into a household’s income. So that means OBBBA’s rules could bring higher taxes for some households in those high-tax states, according to Ben Henry-Moreland, a former planner who’s a senior financial planning nerd with the Kitces.com blog.

“Having an unlimited SALT deduction prior to the TCJA meant that people who just lived in a higher-tax state often found themselves subject to the alternative minimum tax,” he said. “We’re going to see, I think, more people become subject to the AMT because of that than the actual changes to the AMT itself.”

READ MORE: Financial advisors are divided over this RMD tax strategy

The main new AMT payers

The SALT deductions, incentive stock option compensation and interest income from private activity bonds amount to the most common possible reasons that households could be newly eligible for the AMT next year, according to Henry-Moreland and Holly Swan, the head of wealth solutions in the global client strategy unit of asset management firm Allspring Global Investments. But the rules often prove complicated, to the point that Swan, who created a helpful checklist of AMT guidelines for advisors and clients, heard another tax pro comparing the AMT to a torpedo. They could already be causing changes to their plans for this tax year.

“We might see a lot of people who have ISOs wanting to exercise this year, so that they’re not opting into the new AMT regime,” Swan said. “And then we might see people who have favored private activity bonds, which can have higher interest rates, reconsidering that or just adjusting the math on how they look at the after-tax yield on those rates.”

No one can say for sure, though, by how much the roughly 150,000 to 250,000 households paying the AMT since the 2017 law will increase under OBBBA’s new rules. They just know that the number is much lower than in the absence of the megalaw, according to Garrett Watson, a senior policy analyst and modeling manager at the nonprofit, nonpartisan Tax Foundation.

“More people will fall into it than this year,” he said of the AMT. “There are more folks falling into the AMT next year than this year, although way fewer than there would have been, had the previous law expired.”

Scroll down the page to see five key questions for financial advisors, tax professionals and their clients to consider on the alternative minimum tax, or read the main feature story, “‘Stealth’ tax is back: An advisor primer on the alternative minimum tax.” For a look at how advisors can ensure they’re maintaining the boundary between tax guidance and tax advice, click here.

Got the glossary straight?

In addition to its wonky acronym, the AMT has spawned two other terms that do not apply to anything else in finance. 

The “tentative minimum tax payment” refers to a taxpayer’s potential liability under the AMT, and that number is “tentative” because they will only need to pay that amount if it turns out to be higher than their basic federal income tax. 

The other jargon revolves around “preference items,” which are deductions, credits and other tax incentives that households must add back to their income for purposes of the AMT. Some of the most common preference items are: the deduction for state and local taxes, incentive stock options, interest income from private activity bonds and the standard deduction.

What is the client’s AMT income?

To find their specific income under the AMT, clients must add those preference items back to their traditional income. Then they can calculate whether they are eligible for any exemptions.

READ MORE: Caps, credits, contributions: Tax planning for parents under OBBBA

What is the exemption, and what is the phaseout?

OBBBA’s boost of the state and local tax deduction will likely bring more households into the AMT’s purview, so they’ll need to understand their level of exemption and the level of income that causes the exemption to phase out at the upper income ranges.

In 2025, the first $88,100 for individuals and $137,000 for couples out of their income for AMT purposes is exempt. But that exemption phases out at 25 cents per dollar, starting at $626,350 for individuals and $1,252,700 for married households filing jointly. 

In 2026, inflation adjustments to the exemption will push the numbers up to $90,100 for single filers and $140,200 for couples. But the phaseout begins at lower levels — $500,000 for individuals and $1 million for spouses — and the exemption goes away twice as quickly, at 50 cents on the dollar above those levels of AMT income.

What is the client’s AMT liability?

Once the taxpayers have subtracted any exemptions from their AMT income, they can calculate how much of that will be subject to 26% or 28% rates.

For 2025, the first $119,550 of AMT income for single filers and the first $239,100 for couples will be taxed at 26%, with any other income getting hit at a 28% rate. In 2026, those numbers will go up to $122,250 for single filers and $244,500 for joint households.

If the client has received any foreign AMT tax credits, they will then reduce that amount of that credit from the resulting number to find their tentative AMT liability.

READ MORE: Using tax-aware long-short vehicles to track down alpha

Which will the client pay, the traditional income tax or the AMT?

They will, most likely, pay the traditional federal income tax bill to Uncle Sam. However, if the dollar amount of their AMT liability is higher than their standard federal income tax bill, the clients will be among the several millions or so households that must now pay under the alternative system.

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Accounting

Global ESG Reporting Standards and Double Materiality Compliance

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Corporate accounting departments face expanding reporting expectations as international sustainability disclosure standards achieve regulatory enforcement across major global jurisdictions. Chief Accounting Officers (CAOs) and corporate controllers are establishing rigorous internal accounting controls to treat Environmental, Social, and Governance (ESG) metrics with the same data precision, auditability, and governance as traditional financial statements.

Regulatory Harmonization Under Global Sustainability Frameworks
The implementation of standardized sustainability reporting frameworks—notably rules established by international sustainability accounting boards—has created unified expectations for public and large private enterprises. Corporations must report standardized metrics covering greenhouse gas emissions (Scope 1, 2, and material Scope 3), energy utilization, workforce demographics, and supply chain governance.

In Europe and other participating international jurisdictions, double materiality principles are mandatory. Under double materiality, organizations must report both how external sustainability risks impact corporate financial performance, and how internal corporate operations affect surrounding environmental and social structures.

Integrating Sustainability Metrics into Core ERP Systems
To provide auditable non-financial data, enterprise organizations are integrating specialized carbon accounting and ESG management platforms directly into core ERP systems. Automated data collectors capture energy utility invoices, logistics fuel consumption metrics, and vendor compliance records in real time.

Establishing automated, traceable data pipelines ensures that non-financial reporting is supported by clear audit trails. This structured approach allows external financial auditors to provide reasonable assurance on sustainability disclosures during annual corporate reporting cycles.

Financial Impacts and Capital Market Disclosure
Accurate ESG reporting directly influences corporate cost of capital and institutional credit ratings. Commercial lenders and institutional asset managers systematically incorporate sustainability metrics into risk pricing models. Companies that demonstrate transparent, verifiable progress in operational energy efficiency and climate risk mitigation benefit from expanded access to green bond markets and lower debt pricing.

Action Steps for Accounting Leadership
1. Implement Double Materiality Frameworks: Conduct comprehensive assessments to identify material financial and operational sustainability metrics.
2. Build Auditable Non-Financial Data Pipelines: Automate ESG data collection within core accounting software to ensure data integrity.
3. Align Sustainability with Annual Financial Filings: Prepare non-financial disclosures concurrently with financial statements to satisfy regulatory audit expectations.

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Accounting

Modernizing Internal Controls: Machine Learning and Continuous Monitoring in Auditing

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Internal audit departments and corporate risk managers are modernizing internal control frameworks by shifting from periodic sampling techniques to continuous monitoring and machine learning analytics. As operational data volumes increase across enterprise organizations, automated control testing ensures financial integrity, prevents corporate fraud, and streamlines annual audit engagements.

The Limitation of Periodic Audit Sampling
Historically, internal and external auditors evaluated internal controls by reviewing random samples of financial transactions—often analyzing less than five percent of total ledger entries. In complex enterprise environments, periodic sampling methods carry inherent risks of overlooking localized financial misstatements, unauthorized disbursements, or operational control breakdowns.

In 2026, progressive internal audit functions are utilizing automated continuous monitoring platforms that evaluate one hundred percent of financial transactions in real time. Continuous control auditing systems continuously monitor general ledger entries, procurement approvals, and expense reimbursements across all operating subsidiaries.

AI-Powered Fraud Detection and Anomaly Identification
Machine learning models trained on historical corporate financial data excel at identifying subtle transactional anomalies that indicate potential fraud or operational error. Automated systems instantly flag duplicate invoice payments, unapproved vendor creation, unusual journal entry timing, and unauthorized override of authority thresholds.

When an anomaly is detected, the automated auditing platform generates an instant risk alert, allowing internal audit teams to investigate root causes immediately. Early detection prevents minor operational errors from escalating into material weaknesses in financial reporting.

Streamlining External Audit Preparation
Continuous internal control monitoring delivers significant benefits during annual external financial audits. External audit firms can review continuous audit logs and automated control testing documentation, reducing the time required for manual field testing.

This integrated approach lowers overall audit compliance fees, reduces administrative burdens on corporate accounting staff, and provides senior management and audit committees with real-time visibility into the organization’s overall risk profile.

Core Implementation Guidelines
1. Transition to 100% Data Testing: Replace legacy sampling methods with automated continuous audit monitoring systems.
2. Deploy Anomaly Detection Algorithms: Implement machine learning models to identify unauthorized transactions and operational control overrides.
3. Align Internal and External Audit Workflows: Coordinate continuous control testing protocols with external auditors to optimize annual compliance cycles.

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Accounting

Automated Tax Compliance and Global Regulatory Harmonization in 2026

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Corporate tax accounting departments are navigating an era of unprecedented regulatory complexity as global tax harmonization frameworks take full effect alongside real-time digital tax reporting mandates. Tax directors and accounting teams are adopting cloud-based tax compliance automation tools to manage multi-jurisdictional tax liabilities and satisfy stringent reporting rules across international jurisdictions.

Implementation of Global Minimum Tax Provisions
The implementation of international tax reform agreements—notably the Pillar Two global minimum tax framework—has reshaped multinational corporate tax planning. Multinational enterprises with consolidated revenues exceeding established thresholds must ensure an effective tax rate of at least 15% across every jurisdiction in which they operate.

Accounting teams are implementing specialized tax calculation modules integrated directly into enterprise resource planning (ERP) platforms. These automated tools calculate effective tax rates per country, identify top-up tax liabilities, and generate standardized compliance documentation required by national tax authorities.

Real-Time Digital Invoicing and E-Reporting Mandates
Tax authorities across Europe, Latin America, and Asia-Pacific have enacted mandatory electronic invoicing (e-invoicing) and continuous transaction controls (CTC). Under these systems, corporate transaction data must be submitted electronically to government portals in real time at the point of sale or invoice issuance.

This shift toward continuous digital tax reporting eliminates traditional annual tax audits in favor of ongoing automated compliance monitoring. Accounting departments are upgrading invoicing software to ensure seamless XML data formatting, digital signature authentication, and real-time validation against tax authority databases.

Automation and Data Analytics in Corporate Tax Strategy
To keep pace with dynamic tax legislation, tax departments are transitioning from reactive compliance teams to proactive strategic advisors. Machine learning algorithms analyze corporate transactional data to identify tax credits, research and development (R&D) incentives, and cross-border transfer pricing adjustments.

By automating routine tax return filings and calculations, corporate tax directors can focus on long-term capital structuring, evaluating the tax implications of corporate mergers, and optimizing international supply chain networks.

Strategic Priorities for Tax Executives
1. ERP System Upgrades: Ensure enterprise software is capable of generating real-time, granular tax data required for global minimum tax compliance.
2. E-Invoicing Integration: Implement scalable e-invoicing platforms to satisfy regional continuous transaction control regulations.
3. Strategic Tax Analytics: Utilize predictive tax modeling tools to evaluate structural changes in corporate operations and cross-border trade.

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