ERP Implementation Timeline Planner

Why Most ERP Implementation Timelines Fail

The average ERP implementation takes twice as long and costs 30% more than originally planned. The reasons are almost always the same: scope creep, data quality problems discovered too late, undertrained users, and unrealistic assumptions about internal bandwidth.

AccountAbility has completed over 500 Acumatica implementations. Our average go-live timeline is 90 days. This planner is built from that experience — including every task that typically causes delays when it is not planned for upfront.

Phase 1: Discovery and Planning (Weeks 1–2)

Week 1: Kickoff and Requirements Gathering

Define project scope, assign internal project owner, establish steering committee. Document current state processes for finance, operations, and reporting. Identify all systems that will be replaced or integrated. Define go-live date and work backward to establish all milestone dates.

Week 2: Data Assessment and Migration Planning

Export data from current systems and assess quality. Define data migration scope — what transfers, what archives, what gets left behind. Begin chart of accounts mapping if integrating into a multi-entity structure. Identify data cleansing tasks and assign ownership.

Phase 2: Configuration (Weeks 3–6)

Weeks 3–4: Core Financial Configuration

Configure company settings, fiscal calendar, chart of accounts, tax codes, currencies, and reporting periods. Set up banking and payment processing integrations. Configure accounts payable and accounts receivable workflows. Build the management reporting structure.

Weeks 5–6: Operational Configuration

Configure inventory, purchasing, sales order management, and any industry-specific modules. Build custom workflows for approval processes. Configure user roles and permission sets. Integrate with connected systems — payroll, CRM, e-commerce, shipping.

Phase 3: Data Migration and Testing (Weeks 7–9)

Week 7: Data Migration Execution

Execute data migration to staging environment. Validate record counts and data integrity. Run reconciliation reports comparing migrated data against source systems. Identify and resolve data quality issues.

Weeks 8–9: User Acceptance Testing

Key users test all configured workflows against documented requirements. Document issues, categorize by severity, and resolve in priority order. Re-test resolved issues. Sign off on each functional area before proceeding to training.

Phase 4: Training (Weeks 10–11)

Power User Training (Week 10)

Train finance leads, operations leads, and department managers first. These users become internal champions and first-line support after go-live. Training should be role-specific and process-based — not a general software walkthrough.

End User Training (Week 11)

Train all remaining users in role-specific sessions. Provide quick reference guides for the most common daily tasks. Set up the internal support process for go-live week questions.

Phase 5: Go-Live and Stabilization (Weeks 12–13)

Go-Live Weekend

Freeze transactions in old system. Execute final data migration. Validate opening balances. Enable all user access. Brief management on go-live day procedures. Have implementation support on standby for the first 48 hours.

Week 13: Stabilization

Daily check-ins with key users for the first week. Track and resolve issues as they arise. Prepare for first month-end close. Begin parallel reporting to validate output accuracy before decommissioning old systems.