casemark/final-tax-return-filing
skills/legal/final-tax-return-filing/SKILL.md
Drafts U.S. final tax return filing packets for decedent estates or dissolving entities, covering final-status designation, short-period reporting, liquidation items, schedule selection, and filing mechanics. Use when handling a "final return", "deceased taxpayer", "estate final 1040", "corporate dissolution filing", "short year return", or any closing-phase tax compliance task.
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Last scanned: Aug 8, 2026, 4:17 AM237.3s1 file scanned
SKILL.md
- name:
- final-tax-return-filing
- language:
- en
- description:
- Drafts U.S. final tax return filing packets for decedent estates or dissolving entities, covering final-status designation, short-period reporting, liquidation items, schedule selection, and filing mechanics. Use when handling a "final return", "deceased taxpayer", "estate final 1040", "corporate dissolution filing", "short year return", or any closing-phase tax compliance task.
Final Tax Return Filing
Builds an audit-ready final filing package to close taxpayer obligations at death or entity dissolution.
Quick Start
- Classify taxpayer: decedent estate or dissolving entity.
- Establish final period end date (date of death or dissolution).
- Verify legal authority (executor, trustee, or liquidator) with documentary proof.
- Identify primary return form (1040, 1120, 1120S, or 1065).
- Determine if this is a short-period return and set reporting cutoff.
Prerequisites
- Legal identifiers: name, SSN/EIN, last known address, date of death or dissolution.
- Authority documentation: court order, letters testamentary, or corporate resolution.
- Source records: prior-year returns, W-2, 1099, K-1, bank/brokerage ledgers, balance sheet, asset transfer docs.
- Extension status: confirm whether filed or still available [VERIFY].
Core Workflow
1. Intake and Status Setup
| Field | Value | Source | |---|---|---| | Taxpayer type | Decedent estate / entity liquidation | Death certificate, dissolution filing | | Final period end date | Date of death or dissolution | Vital records, corporate minutes | | Reporting date range | Jan 1 → end date | Financial close records | | Primary return form | 1040 or 1120/1120S/1065 | Taxpayer type | | Authority | Name + title + proof | Court order / corporate document |
2. Identity and Filing Status
- Populate legal name and ID exactly as source docs show.
- Add final-status indicators:
- Individual: final status and date markers.
- Entity: final return designation and liquidation context.
- Insert signer section reflecting legal authority title.
- Flag jurisdiction-specific signature and filing constraints.
3. Income Capture
For each source: gross amount, timing test (pre-final-date only), source doc, schedule/form line, reclassification needs, review note.
Priority order:
- Wage/withholding (W-2)
- Interest/dividends (1099-INT/DIV, Schedule B)
- Business income/loss (Schedule C / passthrough items)
- Capital activity (basis/holding period → Schedule D)
- Other (settlements, cancellation, cessation adjustments)
4. Deductions and Credits
- Select standard vs itemized using final-period rules.
- Build applicable deductions (medical, SALT, mortgage, charitable, casualty).
- Validate statutory caps and substantiation.
- Build credit matrix: eligibility, phaseout test, supporting schedules, filing-year rules.
- For entities: separate ordinary cessation expenses from non-deductible capital/distribution items.
5. Schedule and Attachment Matrix
| Trigger | Required Artifact | Completion Rule | |---|---|---| | Itemized deductions | Schedule A | Receipts + limits verified | | Interest/dividend volume | Schedule B | Payer detail complete | | Business operations | Schedule C or entity schedules | Cost method consistent | | Capital gains/losses | Schedule D | Basis and term classified | | Liquidation/distributions | Entity/pass-through disclosures | Recipient allocation reconciled | | Estate refund (non-spouse) | Form 1310 | Authority proof attached [VERIFY] | | Non-standard treatment | Written statement | Legal basis included |
6. Filing Mechanics
- Compute due date; adjust for weekends/holidays.
- Choose e-file vs paper based on attachment and form limitations.
- Confirm payment/refund routing (estate account, representative, trust).
- Assemble filing packet and proof list.
- File only after quality controls pass.
7. Final Quality Controls (Mandatory)
- [ ] Recompute all arithmetic and schedule rollups
- [ ] Trace each line to a source document
- [ ] Reconcile withholding, estimated taxes, and credits
- [ ] Verify final return designation appears consistently
- [ ] Confirm no post-termination income included
- [ ] Check signatory authority and signature block
- [ ] Produce exception list for unresolved items
Pitfalls and Checks
- Scope: U.S. federal returns only; defer to state-specific requirements separately.
- Date sensitivity: All due dates and IRS addresses are year-dependent — verify from current IRS publications [VERIFY].
- Authority: Never infer from informal communications; require explicit legal proof before final signature.
- Conservative classification: Use conservative treatment for liquidation/distribution and basis-sensitive items; document arguable positions explicitly.
- Escalation triggers: Significant valuation disputes, multi-state nexus, or substantial tax-risk interpretations.
- Retention: Retain filing proof for at least the minimum administrative period, longer if estate or dispute exposure remains.
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