The most dangerous Section 179 question on the EA exam isn't about the deduction limit. It’s the one where the limit seems obvious, but a hidden total investment figure completely wipes out the deduction you just calculated. Candidates who only memorize the dollar cap walk straight into this trap, losing points because they miss the sequence of limitations the exam is actually testing.
For the EA exam, Section 179 allows an immediate expense of up to $1,220,000 for qualifying property (tax year 2025), but this is reduced if total investment exceeds $3,050,000 and is also capped by business income. Bonus depreciation (60% in 2025) applies after §179, has no income limit, and can create a business loss.
Key facts
- Governing Code: IRC §179 (Expensing Election) and §168(k) (Bonus Depreciation)
- 2025 Section 179 Limit: $1,220,000
- 2025 Investment Threshold: $3,050,000 (phase-out begins dollar-for-dollar above this amount)
- 2025 Bonus Depreciation Rate: 60% of adjusted basis
- Qualifying §179 Property: New or used tangible personal property, off-the-shelf software, and qualified real property (e.g., roofs, HVAC systems).
- Exam Section: Special Enrollment Examination (SEE) Part 2: Businesses
Why Section 179 Is a Major Depreciation Trap on the EA Exam
Section 179 and bonus depreciation are the two primary accelerated depreciation methods tested on SEE Part 2. They allow a business to write off a large part of an asset's cost immediately instead of over years. The IRS knows these are powerful tools, so the rules are layered with interacting limitations that are perfect for creating tricky exam questions.
You will not be asked to simply recall the $1,220,000 limit. Instead, a question will give you asset costs that are well below that limit but bury a total investment number in the facts that triggers the phase-out. Or, it will provide a low business income figure that caps your deduction.
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The examiner's goal is to test your judgment under pressure. Can you apply a three-step limitation process in the correct order? A candidate who just grabs the first number they recognize will fail the question. Mastering this sequence proves you can think like a practitioner. You can drill these specific depreciation scenarios on our platform until the calculation is second nature.
The Three Limitations That Can Invalidate a Section 179 Deduction
Your final Section 179 deduction is the lesser of three separate amounts. The exam will test your ability to calculate all three and choose the correct one.
1. The Overall Dollar Limit ($1,220,000 for 2025)
This is the number everyone memorizes: the maximum amount of qualifying property a business can expense in 2025 is $1,220,000. This is the starting point for your calculation, but it is rarely the final answer on a complex question.
2. The Investment Phase-Out (The Real Point-Killer)
This is the trap. The §179 deduction is designed for small and medium-sized businesses. To enforce this, the deduction is reduced if a business invests too much in one year.
For 2025, the phase-out threshold is $3,050,000. For every dollar of qualifying property placed in service above this threshold, the $1,220,000 deduction limit is reduced by one dollar.
Example: If a business places $3,150,000 of equipment in service, it is $100,000 over the threshold. The §179 deduction limit is therefore reduced by $100,000, to $1,120,000. If investment reaches $4,270,000, the deduction is completely gone.
3. The Business Income Cap (And the Carryforward Rule)
This is the final hurdle. The §179 deduction cannot exceed the taxpayer's aggregate net taxable income from all actively conducted trades or businesses.
If a business has a potential §179 deduction of $500,000 but only has $400,000 of net business income, the deduction is capped at $400,000. The disallowed $100,000 is not lost; it is carried forward indefinitely to future years. Bonus depreciation does not have this limitation and can be used to create or increase a loss.
How Bonus Depreciation Works (and Its Key Differences)
Bonus depreciation, governed by IRC §168(k), is an additional first-year depreciation allowance taken after any §179 expense.
Automatic Application vs. Elect-Out
This is a critical distinction from Section 179. Bonus depreciation is automatic for qualified property. A business must take it unless it formally elects out for a specific class of property on its tax return. Section 179, by contrast, must be affirmatively elected. An exam question might ask what a business must do to preserve future depreciation deductions; the correct answer is to elect out of bonus.
The Phase-Down Schedule You Must Know
The Tax Cuts and Jobs Act of 2017 initially set bonus depreciation at 100%. That rate is now phasing down, and you must know the correct year's rate for the exam.
- 2025: 60%
- 2026: 40%
- 2027: 20%
For an exam taken in 2026, you will be tested on the 2025 tax year rules, so the 60% rate is the one to commit to memory.
Section 179 vs. Bonus Depreciation: A Side-by-Side Breakdown
You must be able to instantly differentiate these two provisions on exam day. This table highlights the key attributes tested.
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| Feature | IRC Section 179 | IRC Section 168(k) Bonus Depreciation |
|---|---|---|
| Application | Must be affirmatively elected | Automatic unless you elect out |
| Dollar Limit (2025) | Capped at $1,220,000 | No dollar limit, based on a percentage (60%) |
| Investment Phase-Out | Yes, begins at $3,050,000 of investment | No investment phase-out |
| Income Limit | Yes, limited to net business income | No, can create or increase a Net Operating Loss (NOL) |
| Property Type | New or used tangible personal property, software, qualified real property | Primarily new or used property with a MACRS life of 20 years or less |
| Related-Party Rule | Ineligible if acquired from a related party, by gift, or inheritance | Generally eligible |
| Carryforward | Yes, if limited by business income | Not applicable (excess creates an NOL) |
The Pass-Through Entity Trap: A Hidden Fourth Limitation
For S-corporations and partnerships, there is another layer to the income limitation that the exam loves to test. The §179 deduction is calculated and limited at the entity level first. Then, the allowable deduction is passed through to the partners or shareholders.
Here's the trap: the individual partner or shareholder is also subject to the business income limitation based on their own aggregate net income from all their active trades or businesses.
A partner might be passed a $50,000 §179 deduction from a partnership, but if that partner has a net loss from their other business activities, they may not be able to claim any of that deduction in the current year. It would be carried forward on their personal return. Understanding this two-level limitation is a hallmark of a well-prepared candidate.
A Step-by-Step Calculation for a Complex Exam Scenario
Let's apply this logic to a question that mirrors the difficulty of the real EA exam.
Scenario: ForgeWorks Inc., a calendar-year C-corporation, manufactures industrial parts. In 2025, they undertake a major equipment upgrade. They purchase and place in service the following new assets:- CNC Machine: $1,800,000
- Industrial Laser Cutter: $1,300,000
Total qualifying property placed in service is $3,100,000. ForgeWorks has taxable income of $900,000 before any §179 or depreciation deductions. What is the maximum total first-year depreciation deduction ForgeWorks can claim in 2025?
Step-by-Step Walkthrough
1. Calculate the Investment Limitation Reduction. The total investment of $3,100,000 exceeds the $3,050,000 threshold.- Excess investment: $3,100,000 - $3,050,000 = $50,000
- This excess reduces the §179 limit dollar-for-dollar.
- Statutory §179 limit: $1,220,000
- Reduction due to excess investment: -$50,000
- Reduced §179 limit: $1,170,000
- Business income cap: $900,000
- The allowable deduction is the lesser of the two: $900,000.
- The remaining $270,000 ($1,170,000 - $900,000) is carried forward.
- Total asset cost: $3,100,000
- Subtract §179 deduction taken: -$900,000
- Remaining Basis: $2,200,000
- Bonus Depreciation: $2,200,000 * 60% = $1,320,000
- Basis after §179: $2,200,000
- Subtract bonus depreciation: -$1,320,000
- Remaining Basis for MACRS: $880,000
- Assuming 7-year property, the first-year MACRS rate (half-year convention) is 14.29%.
- Regular MACRS Depreciation: $880,000 * 14.29% = $125,752
- §179 Deduction: $900,000
- Bonus Depreciation: $1,320,000
- MACRS Depreciation: $125,752
- Total Deduction: $2,345,752
The Tempting Wrong Answer
A candidate in a hurry will make one of two critical errors:
- Ignoring the Phase-Out: They'll see the $1,220,000 limit, compare it to the $900,000 income, and incorrectly start their calculation from there, missing the $50,000 reduction.
- Ignoring the Income Limit: They'll correctly calculate the reduced §179 limit of $1,170,000 but then use that full amount, forgetting it's capped by the $900,000 of business income. This is a very subtle but common mistake.
Following the strict sequence—Phase-Out, then Income Limit, then Bonus, then MACRS—is your defense against these traps. VoraPrep's adaptive learning engine is designed to find which of these steps you're struggling with and give you targeted practice until you're flawless. You can learn more about our full EA prep course here.
How to Practice Depreciation Questions for a Guaranteed Pass
Reading about the rules is not enough. You must build muscle memory by working through problems.
Sample Question 1: Apex Manufacturing placed $1,400,000 of qualifying new equipment in service during 2025. The company has taxable income of $1,500,000 before any depreciation. What is the maximum Section 179 expense Apex can elect for 2025?---
Sample Question 2: GHI Corp placed $3,150,000 of qualifying equipment in service during 2025. The corporation's taxable income before any §179 deduction is $1,300,000. What is the maximum Section 179 deduction GHI Corp can claim for 2025?