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REG Entity Taxation and Pass-Through Reporting

Entity-tax rules for book-tax differences, corporations, S corporations, partnerships, trusts, and exempt entities.

This part covers the main federal tax regimes for entities. The chapters explain how taxable income differs from book income, how major entity forms are taxed, and how those differences affect the stronger exam answer in an entity scenario.

Entity-tax questions should begin with classification. The correct answer often changes depending on whether income is taxed at the entity, passed through to owners, reconciled from book income, or governed by a specialized fiduciary or exempt-entity rule.

In This Part

Entity-Tax Classification Lens

Entity area First decision Exam risk
Book-tax differences Which financial-accounting item must be reconciled for tax purposes. Assuming book income and taxable income move together.
C corporations Whether the issue is entity-level tax, distribution treatment, or shareholder consequence. Forgetting the double-tax structure.
S corporations Whether eligibility, pass-through treatment, basis, or built-in gain rules control. Applying partnership flexibility to an S corporation.
Partnerships Whether allocations, liabilities, basis, or partner transactions drive the result. Ignoring outside basis and debt allocation.
Exempt entities and trusts Whether specialized entity status changes taxable income, deductions, or reporting. Treating specialized entities like ordinary business taxpayers.

Entity Taxation Sequence

Step What to do Why it matters on REG
1. Classify the entity Identify C corporation, S corporation, partnership, LLC, trust, estate, or exempt organization treatment. Entity classification controls who pays tax and which rules apply.
2. Reconcile book and tax income Adjust financial-accounting income for permanent differences, temporary differences, and tax-only items. REG entity questions often start with book income but require taxable income.
3. Determine tax incidence Decide whether tax is paid at the entity level, passed through to owners, or split between entity and owner consequences. C corporations, S corporations, partnerships, and trusts do not tax income the same way.
4. Track basis and distributions Apply owner basis, shareholder basis, partner liabilities, earnings and profits, and distribution ordering when relevant. Many entity answers turn on whether cash or property distributions are taxable.
5. Apply specialized limits Check eligibility, loss limitations, built-in gains, exempt-entity rules, or fiduciary rules. Specialized entity status can change an otherwise familiar tax result.

Entity Tax Checkpoints

Checkpoint Exam use What to avoid
Entity classification Identify whether the taxpayer is a C corporation, S corporation, partnership, LLC, trust, estate, or exempt organization. Applying entity rules before the tax classification is settled.
Book-tax bridge Reconcile financial income to taxable income using permanent differences, temporary differences, and tax-only items. Assuming book income is already the taxable base.
Tax incidence Decide whether tax is paid by the entity, passed through to owners, or split across entity and owner consequences. Treating pass-through and corporate taxation as interchangeable.
Basis and distribution effect Track shareholder basis, partner outside basis, E&P, liabilities, and distribution ordering. Answering distribution questions without basis or E&P support.
Specialized rule Check eligibility, built-in gains, loss limits, fiduciary rules, exempt-entity limits, and reporting obligations. Missing the rule that applies only because of entity status.

How to Use This Part

  • Read this part after the individual chapters so the broader tax framework is already established.
  • Focus on which entity bears the tax and what items pass through to owners or beneficiaries.
  • Return here when a REG miss turns on entity classification or book-versus-tax treatment.

In this section

Revised on Monday, June 15, 2026
5. Individuals
7. Planning