CPA Exam Entity Tax Compliance and Planning: Advanced
Last updated: May 2, 2026
Entity Tax Compliance and Planning: Advanced questions are one of the highest-leverage areas to study for the CPA Exam. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.
The rule
Under IRC §1374, a C corporation that elects S status is subject to a corporate-level tax on net recognized built-in gains during the 5-year recognition period beginning on the first day of the first S year. The tax equals the highest corporate rate (currently 21%) applied to the lesser of (a) the net recognized built-in gain for the year or (b) the taxable income computed as if the S corp were a C corp. The tax is capped cumulatively at the net unrealized built-in gain (NUBIG) measured on the conversion date, and any disallowed gain (limited by the taxable-income cap) carries over to the next year within the recognition window.
Elements breakdown
Net Unrealized Built-In Gain (NUBIG)
The cumulative ceiling on BIG tax exposure, fixed on the first day of S status.
- Sum FMV of all assets at conversion
- Subtract aggregate adjusted basis of those assets
- Subtract liabilities assumed and deductible items
- Result is the lifetime BIG cap
Recognition Period
The window during which dispositions can trigger the §1374 tax.
- Begins first day of first S year
- Lasts 5 consecutive tax years
- Asset must have been held on conversion date
- Tax applies only to gain accrued before conversion
Net Recognized Built-In Gain (NRBIG) — Annual
The taxable measure each year inside the recognition window.
- Identify recognized built-in gains for the year
- Subtract recognized built-in losses
- Subtract allowable C-corp NOL and capital loss carryovers
- Apply the taxable-income limitation cap
Taxable-Income Limitation
Annual cap that defers BIG tax when the entity has low income.
- Compute taxable income as if a C corp
- If lower than NRBIG, use the lower amount
- Disallowed excess carries to next year
- Carryover dies when 5-year window closes
Tax Computation and Shareholder Effect
Mechanics for calculating the tax and the pass-through consequence.
- Multiply NRBIG (after caps) by 21\%
- Tax is paid by the S corporation
- Tax reduces gain that flows to shareholders
- Character of gain (ordinary vs. capital) preserved on K-1
Common patterns and traps
The NUBIG-vs-NRBIG Substitution Trap
Candidates conflate the lifetime ceiling (NUBIG, fixed on conversion day) with the annual taxable amount (NRBIG, computed each year). The exam frequently feeds you both numbers in one fact pattern and tests whether you tax the right one. NUBIG bounds the cumulative §1374 exposure; NRBIG drives this year's tax bill.
A wrong choice multiplies the full NUBIG by 21% in a single year, producing a tax that is mathematically too large because it ignores the annual taxable-income cap and the loss netting required to compute NRBIG.
The Recognition-Period Off-By-One Trap
The recognition period is 5 tax years starting the first day of the first S year — not 5 years from the date of the asset's appreciation, and not 7 or 10 years (which were prior-law amounts that still appear in stale study materials). Sales in the 6th S year and later trigger zero §1374 tax on built-in gains, even if the asset was held throughout.
A wrong choice computes BIG tax on a sale in Year 6 of S status, or applies a 10-year window holdover from prior versions of the statute.
The Taxable-Income Limitation Skip
The §1374 tax is the lower of NRBIG or the entity's taxable income computed as if it were still a C corporation. When candidates skip this comparison, they over-tax low-income years. The disallowed NRBIG carries forward to subsequent years within the 5-year window, which itself is testable.
A wrong choice taxes the full NRBIG at 21% even when hypothetical C-corp taxable income is lower, producing an inflated BIG tax and ignoring the carryover.
The Post-Conversion Appreciation Inclusion Trap
Only gain that accrued before the S election is built-in. Gain attributable to post-conversion appreciation is regular S-corp pass-through gain and is not subject to §1374. The fact pattern often gives you both an FMV-on-conversion-date and a higher sale price years later, and tests whether you isolate the pre-conversion slice.
A wrong choice applies §1374 to the entire gain on disposition (sale price minus original basis), rather than only the FMV-at-conversion minus original basis portion.
The Shareholder Pass-Through Double-Count Trap
The §1374 tax is paid by the S corporation, and the gain that passes through to shareholders is reduced by the amount of BIG tax paid. Candidates either forget the reduction (overstating shareholder K-1 gain) or apply the tax both at the entity level AND at the shareholder level (double-taxing within S mechanics).
A wrong choice reports the gross gain on the shareholder's K-1 without subtracting the entity-level BIG tax, or alternatively double-counts the tax by applying corporate rates to a fully passed-through amount.
How it works
Picture Marquez Holdings, Inc., a C corporation that elects S status effective January 1, Year 1. On that date its assets have a NUBIG of $800,000, driven mostly by appreciated land (basis $200,000, FMV $700,000). In Year 2, Marquez sells the land for $750,000, recognizing a $550,000 gain. Of that gain, $500,000 accrued before the S election (built-in), and $50,000 accrued post-conversion. Only the $500,000 is potentially subject to §1374. If Marquez's hypothetical C-corp taxable income for Year 2 is $600,000, the full $500,000 NRBIG is taxed at $21\%$, producing a $105,000 entity-level BIG tax. That $105,000 reduces the gain passed through on the shareholders' Schedules K-1 — they report $445,000 of gain, not $550,000. If instead C-corp taxable income had been only $300,000, just $300,000 of the $500,000 NRBIG would be taxed in Year 2, and the remaining $200,000 would carry to Year 3, still subject to the 5-year window.
Worked examples
What is Calderon's built-in gains tax liability under IRC §1374 for Year 3?
- A $147,000 ✓ Correct
- B $178,500
- C $199,500
- D $378,000
Why A is correct: The total gain on sale is $1,250,000 − $400,000 = $850,000, but only the gain that accrued BEFORE the S election is built-in: $1,100,000 (FMV at conversion) − $400,000 (basis) = $700,000. The remaining $150,000 is post-conversion appreciation and escapes §1374. NRBIG of $700,000 is less than the $950,000 hypothetical C-corp taxable income cap, so the full $700,000 is taxed at 21%, yielding $147,000. The sale occurred in Year 3, well within the 5-year recognition period.
Why each wrong choice fails:
- B: This taxes the entire $850,000 realized gain at 21%, ignoring that only the pre-conversion appreciation ($700,000) is 'built-in' under §1374. (The Post-Conversion Appreciation Inclusion Trap)
- C: This applies 21% to the $950,000 hypothetical C-corp taxable income, treating the income cap as the tax base rather than as a ceiling. The cap only matters when it is lower than NRBIG. (The Taxable-Income Limitation Skip)
- D: This applies 21% to the full $1,800,000 NUBIG in a single year, conflating the lifetime cap with the annual NRBIG amount. (The NUBIG-vs-NRBIG Substitution Trap)
What is Okafor's built-in gains tax liability for Year 2?
- A $56,700
- B $63,000 ✓ Correct
- C $109,200
- D $126,000
Why B is correct: NRBIG = $600,000 built-in gain − $80,000 built-in loss − $50,000 C-corp NOL carryover = $470,000. The taxable-income limitation caps the BIG tax base at the hypothetical C-corp taxable income of $300,000, which is lower than NRBIG. Tax = $300,000 × 21% = $63,000. The $170,000 disallowed NRBIG carries forward to Year 3, still within the 5-year recognition window.
Why each wrong choice fails:
- A: This computes 21% × $270,000, which appears to subtract the NOL from the taxable-income cap — an incorrect double-application of the NOL. The NOL reduces NRBIG, not the taxable-income cap.
- C: This taxes the full $520,000 net built-in gain ($600,000 − $80,000) at 21%, skipping both the NOL adjustment and the taxable-income limitation. (The Taxable-Income Limitation Skip)
- D: This applies 21% to the gross $600,000 built-in gain, ignoring the built-in loss netting, the NOL carryover, and the taxable-income cap. (The Taxable-Income Limitation Skip)
What is Tran's built-in gains tax liability under IRC §1374 for Year 6?
- A $0 ✓ Correct
- B $84,000
- C $115,500
- D $147,000
Why A is correct: The §1374 recognition period is 5 tax years beginning on the first day of the first S year (Year 1). The recognition period therefore covers Years 1 through 5 and ends on December 31 of Year 5. Tran's sale on March 15, Year 6 falls outside the recognition window, so no built-in gains tax applies regardless of how much pre-conversion appreciation existed in the asset.
Why each wrong choice fails:
- B: This computes 21% × $400,000 (the pre-conversion built-in gain of $900,000 − $500,000), correctly isolating the built-in portion but incorrectly assuming the recognition period still applies in Year 6. (The Recognition-Period Off-By-One Trap)
- C: This applies 21% to the entire $550,000 recognized gain, both extending the recognition period beyond 5 years and including post-conversion appreciation that is never built-in. (The Recognition-Period Off-By-One Trap)
- D: This applies 21% to the $700,000 hypothetical C-corp taxable income, treating the income cap as the tax base and ignoring the recognition-period expiration. (The Taxable-Income Limitation Skip)
Memory aid
BIG = '5-21-Lower': 5-year window, $21\%$ rate, tax the LOWER of NRBIG or hypothetical C-corp taxable income.
Key distinction
The §1374 tax applies only to gain that economically accrued BEFORE the S election and is recognized DURING the 5-year recognition period — post-conversion appreciation and gains recognized in Year 6+ escape the tax entirely.
Summary
Built-in gains tax under §1374 imposes a 21% corporate-level tax on appreciation baked into a former C corporation's assets when those assets are sold within 5 years of the S election, capped annually by hypothetical C-corp taxable income and lifetime by NUBIG.
Practice entity tax compliance and planning: advanced adaptively
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Start your free 7-day trialFrequently asked questions
What is entity tax compliance and planning: advanced on the CPA Exam?
Under IRC §1374, a C corporation that elects S status is subject to a corporate-level tax on net recognized built-in gains during the 5-year recognition period beginning on the first day of the first S year. The tax equals the highest corporate rate (currently 21%) applied to the lesser of (a) the net recognized built-in gain for the year or (b) the taxable income computed as if the S corp were a C corp. The tax is capped cumulatively at the net unrealized built-in gain (NUBIG) measured on the conversion date, and any disallowed gain (limited by the taxable-income cap) carries over to the next year within the recognition window.
How do I practice entity tax compliance and planning: advanced questions?
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What's the most important distinction to remember for entity tax compliance and planning: advanced?
The §1374 tax applies only to gain that economically accrued BEFORE the S election and is recognized DURING the 5-year recognition period — post-conversion appreciation and gains recognized in Year 6+ escape the tax entirely.
Is there a memory aid for entity tax compliance and planning: advanced questions?
BIG = '5-21-Lower': 5-year window, $21\%$ rate, tax the LOWER of NRBIG or hypothetical C-corp taxable income.
What's a common trap on entity tax compliance and planning: advanced questions?
Forgetting the taxable-income limitation
What's a common trap on entity tax compliance and planning: advanced questions?
Confusing NUBIG (lifetime cap) with NRBIG (annual)
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