As we navigate the complexities of 2025 tax preparation, taxpayers must address the significant shifts introduced by the One Big Beautiful Bill (OBBBA) legislation alongside various delayed effective dates from prior acts. These updates represent a pivot in the tax environment, impacting diverse categories of filers from high-net-worth families in Burlingame to emerging Bay Area businesses. Success in this new era requires proactive planning and a clear understanding of how these alterations affect your long-term financial legacy.

The Role of Modified Adjusted Gross Income (MAGI)

Throughout this analysis, the term Modified Adjusted Gross Income (MAGI) serves as a critical benchmark. MAGI is the primary metric used by the IRS to determine your eligibility for specific credits, deductions, and tax benefits. It begins with your Adjusted Gross Income (AGI)—your total gross income minus allowable exclusions—and then adds back certain types of excluded income. For many of our clients, managing MAGI is essential for staying beneath the phase-out thresholds that define the 2025 tax year.

Enhanced Deductions for Individuals and Families

Senior Deduction Enhancements: From 2025 through 2028, taxpayers aged 65 or older are eligible for a new $6,000 deduction. This benefit is accessible regardless of whether you itemize or choose the standard deduction. However, this provision is subject to MAGI-based phase-outs, beginning at $75,000 for single filers and $150,000 for those filing jointly.

Strategic Relief for Tips and Overtime: Service industry professionals and hourly employees receive targeted relief under new provisions. Those in customary tip-receiving roles can deduct up to $25,000 of tip income annually from 2025 to 2028. Furthermore, a new deduction for overtime (OT) pay allows for the exclusion of the premium portion of pay (the amount exceeding regular rates) for hours worked beyond 40 per week. This OT deduction is capped at $12,500 for individuals and $25,000 for joint filers, with phase-outs initiating at MAGI levels of $150,000 and $300,000, respectively.

The Documentation Burden for Overtime: Because the OT deduction was enacted mid-2025 with retroactive effect, employers may lack the granular payroll data required for automated reporting. At Sullivan & Company, we advise clients to maintain meticulous records, including pay stubs, to substantiate the deductible portion of their premium pay. It is the taxpayer’s responsibility to verify that only hours exceeding 40 per week are claimed, adjusted for any premiums that exceed 50% of the base rate.

Vehicle Loan Interest Deduction: Owners of new, personal-use vehicles assembled in the U.S. and acquired after 2024 can now deduct up to $10,000 in annual loan interest. This applies to vehicles weighing under 14,000 pounds and is available to both itemizers and non-itemizers. You must provide the Vehicle Identification Number (VIN) on your return. This benefit phases out when MAGI reaches $100,000 for singles or $200,000 for joint returns.

Family-Centric Credits and the SALT Shift

Expansion of Adoption and Child Credits: The Adoption Credit has been increased to $17,280, featuring a $5,000 refundable component. Phase-outs for this credit begin at a MAGI of $259,190. Additionally, the Child Tax Credit has risen to $2,200 per child, with $1,700 being refundable, phasing out at $200,000 for individuals and $400,000 for joint filers.

SALT Deduction Adjustments (2025-2029): For our California-based clients, the State and Local Tax (SALT) deduction remains a focal point. For 2025, the itemized deduction limit has been raised to $40,000. However, a phase-down begins at a MAGI of $500,000, eventually hitting a $10,000 floor at $600,000. These limits will adjust annually through 2029 before reverting to the $10,000 cap in 2030.

Expiration of Environmental Incentives: Please note that residential clean energy credits and home efficiency improvement credits are set to expire after December 31, 2025. Electric vehicle credits have already expired for purchases made after September 30, 2025.

Retirement, Education, and the Trump Account

Super Retirement Catch-Ups: Individuals aged 60 to 63 can now utilize enhanced catch-up contributions for qualified plans like 401(k)s and 403(b)s, reaching $11,250 for 2025 ($5,250 for SIMPLE plans). Standard catch-up rates apply to those outside this specific age bracket.

Expanded 529 Flexibility: Distributions from 529 plans can now be utilized for elementary and secondary schooling expenses and credentialing programs, providing greater versatility for educational funding after July 4, 2025.

The Trump Account Election: Similar to a child’s IRA, these accounts can be established via the 2025 tax return for children aged 0-17. The government will provide a $1,000 seed contribution for children born between 2025 and 2028, with accounts opening for contributions in July 2026. While offering a financial head start, there are specific downsides to consider before electing this option.

Core Business Tax Provisions

• Bonus Depreciation: 100% bonus depreciation was made permanent as of January 19, 2025. Assets placed in service earlier in the month were limited to a 40% rate.

• Interest Limits and EBITDA: The business interest deduction limit is now calculated using EBITDA. Small businesses with average gross receipts under $31 million remain exempt from these constraints.

• Section 179 and R&E: The Section 179 expensing limit has increased to $2.5 million, with a phase-out threshold of $4 million. Domestic research and experimental expenditures are now immediately deductible, though foreign costs still require 15-year amortization.

• Qualified Small Business Stock (QSBS): For shares acquired after July 4, 2025, gain exclusions are tiered based on holding periods: 50% at three years, 75% at four, and 100% at five years. The exclusion is capped at $15 million.

Reporting and RMD Compliance: The IRS has returned 1099-K reporting thresholds to $20,000 and 200 transactions. Regarding retirement distributions, beneficiaries under the 10-year rule must ensure they are taking annual RMDs. If you missed a 2025 RMD, you must take both the 2025 and 2026 amounts in 2026 and request a penalty waiver for the prior year.

Maintaining tax efficiency amidst these legislative shifts requires a defensive and strategic approach. By organizing your documentation and understanding these thresholds now, you can preserve wealth and ensure compliance. If you have questions regarding how OBBBA affects your estate or business, contact Sullivan & Company CPA Inc. to schedule a strategic consultation.

To implement these changes effectively, one must look closer at the specific mechanics of Modified Adjusted Gross Income (MAGI). For many high-net-worth families and professionals in the Burlingame area, MAGI is not a static figure but a variable calculation that shifts depending on which credit or deduction is being targeted. Generally, this calculation begins with your Adjusted Gross Income (AGI) and adds back specific items such as foreign earned income, tax-exempt interest, and certain deductions for student loan interest. This nuance is particularly relevant for the new Senior Deduction and the vehicle loan interest benefits, where exceeding the phase-out threshold by even a small margin can lead to a dollar-for-dollar reduction in the tax benefit.

In the realm of employment income, the new deductions for tips and overtime (OT) present a unique administrative challenge for the 2025 filing year. The ‘premium portion’ of overtime is defined specifically as the amount paid above the regular hourly rate. For instance, if an employee earns a base rate of $40 per hour and receives $60 per hour for overtime work, the deductible premium is the $20 difference for every hour worked beyond the standard 40-hour week. However, the legislation caps this deductible premium at 50% of the regular rate. If a specialized worker earns a ‘double-time’ rate of $80, the deduction remains limited to the $20 premium (50% of $40) rather than the full $40 premium. Because most standard W-2 forms do not break down these specifics, taxpayers must take a proactive role in record-keeping. We recommend maintaining a digital archive of all pay stubs and employment contracts to ensure that these deductions are defensible under IRS scrutiny.

The Vehicle Loan Interest Deduction also introduces new compliance hurdles, specifically regarding the ‘U.S. assembly’ requirement. To qualify for the $10,000 annual interest deduction, the vehicle must have its final assembly point within the United States. Taxpayers and their advisors must verify this through the Vehicle Identification Number (VIN) or the manufacturer’s Monroney label. For business owners who utilize vehicles for both personal and professional purposes, it is critical to distinguish between this new personal-use deduction and existing business expensing rules. Personal-use vehicles weighing less than 14,000 pounds fall under this $10,000 cap, whereas business vehicles remain subject to the Section 179 and bonus depreciation frameworks, which were substantially altered by the OBBBA.

For business entities, the transition from EBIT to EBITDA for the interest deduction limitation is a significant technical shift. By moving to an EBITDA-based calculation (Earnings Before Interest, Taxes, Depreciation, and Amortization), the limit is applied to a larger financial base, as depreciation and amortization are no longer subtracted from the total. This change is particularly beneficial for capital-intensive businesses in the Bay Area, such as those in manufacturing, construction, or technology infrastructure, as it prevents non-cash depreciation expenses from artificially lowering the amount of interest that can be deducted. Furthermore, the increase in the Section 179 expensing limit to $2.5 million provides a powerful tool for immediate cash flow management, though the dollar-for-dollar phase-out starting at $4 million in purchases requires careful timing of equipment acquisitions at year-end.

The Qualified Small Business Stock (QSBS) provisions under Section 1202 also saw significant updates for shares acquired after July 4, 2025. The tiered exclusion rates—50% after three years, 75% after four, and 100% after five—create a powerful incentive for long-term investment in domestic C-corporations. With the asset limit increased to $75 million, more growth-stage companies will qualify for this benefit, allowing founders and early investors to exclude up to $15 million in gains. As forensic accounting experts, we emphasize that maintaining the ‘active business’ status and ensuring the corporation remains a domestic C-corp throughout the holding period are vital for claiming these exclusions. Any shift in entity structure or business activity could inadvertently disqualify the stock from these preferential rates.

Regarding the SALT deduction, the new phased approach provides a temporary reprieve for taxpayers in high-tax states like California. The $40,000 limit for 2025 offers four times the previous capacity for deducting state and local property and income taxes. However, the sliding scale phase-down between $500,000 and $600,000 of MAGI means that high-income earners will still face the $10,000 floor. This requires a multi-year tax projection to determine whether it is more advantageous to accelerate certain state tax payments or defer income to stay below the phase-out triggers.

Lastly, the ‘Trump Account’ election for children presents both an opportunity and a strategic risk. While the $1,000 government seed contribution is a generous starting point for children born between 2025 and 2028, these accounts function as custodial vehicles that may impact future eligibility for need-based financial aid. Unlike 529 plans, which offer expanded flexibility for K-12 tuition and credentialing programs after July 2025, the Trump Accounts are strictly structured for long-term wealth accumulation. Families should evaluate their overall educational and generational wealth transfer goals before electing to open these accounts on their 2025 returns. By integrating these technical details into your broader financial strategy, you can navigate the OBBBA changes with confidence and precision.