# C Corp Form 1120 Reconciliation

> Reconcile multi-source corporate tax data to prepare Form 1120 using expense sheet as authoritative source

- Skill: `vamseeachanta/c-corp-form-1120-reconciliation` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/c-corp-form-1120-reconciliation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/c-corp-form-1120-reconciliation/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: vamseeachanta (https://skillmd.com/u/vamseeachanta)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/vamseeachanta/c-corp-form-1120-reconciliation

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# C-Corp Form 1120 Reconciliation from Mixed Sources

When reconciling corporate tax filings from multiple conflicting sources (invoices, bank deposits, expense sheets), establish a single authoritative source—typically the cash-basis expense sheet prepared from actual bank activity. Map each expense line item to specific Form 1120 schedules (J, K, L, M-1). Identify critical missing data gaps (beginning-of-year balances, capital structure, bank balances) and determine whether the return can file without them. Use this workflow: (1) declare source of truth, (2) line-by-line mapping to form, (3) gap analysis with must-have vs. can-assume fields, (4) select appropriate filing tool (FreeTaxUSA ≠ 1120; use IRS PDF, Otto, or professional software).