MACRS, Bonus Depreciation & Section 179: A Planning Guide - Part 1

Depreciation is often treated as a calculation. A client buys an asset; the preparer enters it into the software, and Form 4562 does the rest.

For tax professionals, that approach can miss the real planning issue. MACRS depreciation, bonus depreciation, and Section 179 can affect taxable income, estimated payments, cash flow, owner-level planning, and state tax exposure. The better question is not only "how much depreciation is allowed?" It is also: what depreciation position makes sense based on the taxpayer's facts, timing, planning goals, and documentation?

That is why depreciation planning needs more than a fixed asset schedule. It needs clear facts, technical research, and supportable conclusions.

What Is MACRS Depreciation?

MACRS, or the Modified Accelerated Cost Recovery System, is the main federal depreciation system used to recover the cost of many business and income-producing assets. Under MACRS, the depreciation result depends on several inputs: the type of property, recovery period, method, convention, placed-in-service date, and whether special rules such as bonus depreciation or Section 179 apply. This is why MACRS is a planning and research issue, not just a data-entry item.

Why Depreciation Planning Matters

Depreciation affects both current-year and future-year tax outcomes. Accelerating depreciation may reduce taxable income now, but it can also reduce deductions available in later years. For pass-through entities, the result may interact with owner-level basis, at-risk rules, passive activity limitations, and state tax treatment.

The highest current-year deduction is not always the best answer. A taxpayer may prefer to preserve deductions for future years, avoid a state addback issue, manage taxable income, or align deductions with financing and growth plans.

For CPAs, this creates a planning opportunity. Depreciation advice can help clients make better year-end purchase decisions, understand the timing of deductions, and document why a particular tax position was taken.

This is exactly where AI-assisted tax research like Feather can support the practitioner. Feather can help research the applicable rules, surface relevant authority, identify planning considerations, and help draft a client memo that explains the recommendation clearly.

Bonus Depreciation: Useful, but Timing Matters

Bonus depreciation can allow taxpayers to deduct a large portion of qualifying property in the year the asset is placed in service. Under current IRS guidance, qualified property acquired and placed in service after January 19, 2025, may be eligible for 100% bonus depreciation.

Per IRS Notice 2026-11 and Rev. Proc. 2026-15, the acquisition date is a key determining factor here. The 100% rate generally applies only to property acquired after January 19, 2025. If a taxpayer entered into a binding written contract to purchase property before January 20, 2025, the asset may remain subject to the prior bonus depreciation phase-down rules, even if it is placed in service later.

That makes contract review a key planning step. Practitioners should ask not only when the asset was placed in service, but also when the taxpayer became bound to acquire it.

Section 179: 2026 Limits and Planning Considerations

Section 179 allows taxpayers to elect to expense the cost of certain qualifying property, subject to dollar limits, phaseout rules, taxable income limitations, and other requirements. The election is generally reported on Form 4562.

For tax years beginning in 2026, the maximum Section 179 deduction is $2,560,000. This limit begins to phase out when the cost of Section 179 property placed in service during the year exceeds $4,090,000. For sport utility vehicles, the maximum Section 179 deduction for tax years beginning in 2026 is capped at $32,000.

These limits make Section 179 a powerful planning tool, but the election should still be modeled. Section 179 is elective and can be applied selectively to specific assets. Bonus depreciation may apply more broadly unless the taxpayer elects out.

With strategic planning, a practitioner may use Section 179 for some assets while allowing regular MACRS depreciation or bonus depreciation for others. The choice should be coordinated with taxable income, state conformity, owner-level limitations, and future-year planning.

Vehicle Depreciation: Watch the Caps

Vehicle depreciation is a common planning trap. A client may assume that 100% bonus depreciation means a business vehicle can be fully written off in the first year. That is not always true. Passenger automobiles, including certain trucks and vans, remain subject to strict annual depreciation limits under Section 280F.

For passenger automobiles placed in service in 2026, the first-year depreciation limit is $20,300 if bonus depreciation applies and $12,300 if bonus depreciation does not apply.

This means the "luxury auto" caps still matter, even in a 100% bonus depreciation environment. Practitioners should distinguish between heavy SUVs, passenger automobiles, trucks, vans, and other business vehicles before advising on first-year deductions.

MACRS Conventions: Half-Year, Mid-Quarter, and Mid-Month

The half-year convention generally treats property as placed in service at the midpoint of the year. The mid-quarter convention may apply if more than 40% of the depreciable basis of certain property is placed in service during the last three months of the tax year. The mid-month convention generally applies to real property, including residential rental property and nonresidential real property.

This can create year-end planning surprises. A business may buy equipment in December expecting a large deduction, only to find that the mid-quarter convention reduces the first-year amount. A real estate taxpayer may need to account for the mid-month convention when modeling placed-in-service timing for a building or improvement.

The key is to review the full-year asset addition schedule before making a year-end recommendation.

Client-Facing Example: Year-End Asset Planning

Assume a CPA advises a profitable S corporation. The client purchased equipment, technology assets, leasehold improvements, and a business vehicle during the year. The owner asks: "Can we write this off?"

The CPA needs more facts before answering, for instance, which assets were purchased? When were they placed in service? Was any asset purchased under a binding contract entered before January 20, 2025? Are the improvements qualified improvement property? Is bonus depreciation available? Should Section 179 be elected? Is the vehicle subject to the SUV cap or passenger automobile limits? Does the state follow the federal treatment?

Using Feather, the CPA can research MACRS recovery periods, bonus depreciation eligibility, 2026 Section 179 limits, vehicle depreciation caps, and state conformity. Feather can also help draft a client-facing memo explaining the available options and the recommended approach.

That turns depreciation from a compliance calculation into tax planning advice.

Practical Watch-Outs for CPAs

• Vague asset descriptions create risk. "Equipment," "renovation," "vehicle," and "software" are rarely enough.
• Confirm the placed-in-service date. The invoice date or payment date may not provide indication as to when the asset was ready and available for its intended use.
• Review acquisition timing and binding contracts. The 100% bonus depreciation rate may not apply if the taxpayer was already bound to acquire the property before January 20, 2025.
• Review fourth-quarter asset additions. The mid-quarter convention can materially affect first-year depreciation.
• Do not model bonus depreciation or Section 179 without considering the state impact.
• Preserve documentation. Fixed asset schedules should be tied to invoices, contracts, asset descriptions, placed-in-service dates, depreciation methods, recovery periods, conventions, vehicle classification, and elections.

Conclusion

MACRS depreciation, bonus depreciation, and Section 179 are powerful tax planning tools. The right decision, however, depends on the taxpayer's facts, goals, timing, and documentation.

Feather helps tax professionals research MACRS, bonus depreciation, Section 179, vehicle depreciation limits, and state conformity issues. For CPAs working with clients, Feather can support clearer planning memos and better year-end conversations.

Have Additional Questions?

If you need deeper guidance on MACRS recovery periods, bonus depreciation eligibility, Section 179 elections, vehicle depreciation caps, or state conformity, Feather can help with citation-backed, practitioner-grade answers.