Figures: tax year 2026
Automated diagnostic and validation checks compare imported records, return fields, and expected relationships. To resolve discrepancies identified by those checks, the reviewer establishes the underlying transaction before changing a mapping or clearing a warning.
A clean arithmetic check cannot establish completeness because omitted transactions never enter its total. Likewise, offsetting category errors can preserve aggregate income while misstating ordinary income and separately stated items.
The reviewer retains a resolution record containing the warning, source evidence, decision, corrected amount, and affected downstream schedules. A supported false-positive warning receives a documented no-change conclusion rather than an artificial balancing adjustment.
HIGH-FREQUENCY: When a diagnostic reports matching totals, inspect category-level completeness. A charitable deduction placed in ordinary expenses can leave aggregate income unchanged while both return categories are wrong.
A completed resolution follows this sequence:
- Match the diagnostic to its source document and posting reference.
- Determine whether the source ledger, import, mapping, or return field is wrong.
- Correct only the affected record and recompute dependent amounts.
Common mistakes
- Deducting a gift twice. In Example 2, retaining $30,000 rent while also reporting $10,000 charity incorrectly produces $96,000 - $10,000 - $10,000 = $76,000.
- Counting qualified dividends twice. Adding Linden’s $1,200 qualified subset to its $2,000 ordinary dividends incorrectly reports $3,200 of dividend income.
- Adding exempt income to AAA. Including Linden’s net exempt activity incorrectly produces $60,000 + $1,000 - $200 = $60,800 ending AAA.
Bottom line
- Ordinary business income combines operating receipts and allowable operating deductions after separately stated items are removed.
- Schedule K reports entity totals, while Schedule K-1 preserves each shareholder’s allocated amounts and tax character.
- Tax-exempt income, nondeductible expenses, and distributions remain reportable even when excluded from taxable operating income.
- AAA reflects taxable operating adjustments; OAA captures exempt activity and specified other adjustments, while shareholder stock basis remains a separate record.
Exam shortcut
Start with a source-item column and assign each transaction to operating income, a separate tax category, or reportable information before calculating totals. When a stem supplies book income, build a book-to-tax bridge and independently compute ordinary income from operating records. Circle qualified-dividend subsets and already-included depreciation amounts to prevent double counting. For AAA, calculate current increases minus current reductions before touching distributions. A negative answer signals the deferred-adjustment sequence.
The full lesson (about 7,346 words, 49 min read) adds 6 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- V.C2
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