Post-Merger Integration Checklist: Merging Accounting Systems After an Acquisition

# Post-Merger Integration Checklist: Merging Accounting Systems After an Acquisition ## Objectives of Financial Integration - Preserve data integrity and audit trails - Produce consolidated reporting quickly - Maintain compliance during the transition period - Minimize business disruption and cash leakage ## Consolidate the Chart of Accounts ### Mapping & Rationalization - Map target accounts to the acquirer’s structure - Eliminate duplicates and obsolete accounts - Preserve historical comparability via mapping tables ### Controls - Lock legacy structures post-cutover - Document mapping logic and ownership ## Align Accounting Policies ### Revenue Recognition - Identify policy differences (e.g., ASC 606 vs local GAAP) - Harmonize performance obligation treatment and estimates ### Other Policies - Capitalization thresholds, depreciation methods - Inventory valuation (FIFO/LIFO/Weighted Avg) - FX translation and intercompany pricing ## Systems & Data Migration ### Pre-Migration - Inventory data sources (GL, subledgers, banks) - Define data quality rules and acceptance criteria - Dry-run migrations in a sandbox ### Cutover - Freeze periods and data entry windows - Reconcile opening balances to legacy closing balances - Validate subledger-to-GL tie-outs ## Controls, Compliance, and Reporting ### Internal Controls - Update process narratives and control matrices - Reassign control ownership and approvers ### External Requirements - Update tax registrations and payroll IDs - Maintain separate statutory ledgers where required - Ensure timely consolidated financials for lenders/board ## People & Operating Model ### Team Structure - Define Day 1 RACI for close, AP/AR, and FP&A - Determine shared services vs. outsourced transitional help ### Communication - Publish a close calendar and integration playbook - Weekly checkpoints with risk/issue logs ## Day 30/60/90 Milestones - D30: Unified CoA, bank reconciliations aligned, first consolidated P&L - D60: Policy harmonization complete, automated intercompany - D90: System decommission plan executed, audit-ready documentation ## KPIs to Monitor - Close cycle length, unreconciled items, intercompany aging - One-time integration costs vs. synergy capture ## CTA Need transitional accounting support or a PMO for integration? Talk to our fractional CFO team to accelerate synergy capture while staying compliant.