---
title: "Cutover date"
description: "What is a cutover date? The day you stop using the old system and start in the new one, with opening balances as at that date. Learn how to choose it well."
url: https://1flux.ai/glossary/cutover-date
last_updated: 2026-10-10
---

[Accounting](https://1flux.ai/glossary#accounting)

# Cutover date

What is a cutover date, and how do you choose one for an ERP go-live?

Glossary Updated 10 October 2026

Definition

A cutover date is the date a business stops recording transactions in its old system and starts in the new one, with opening balances brought in as at that date.

## What is a cutover date used for?

Choosing it well makes migration simpler. Month-end or year-end dates are common, because the old books are closed and reconciled at that point. Everything before the cutover stays in the old system and everything after goes into the new one. Stock is usually counted on or just before the cutover, and open documents such as unpaid invoices and undelivered orders are carried across as [opening balances](https://1flux.ai/glossary/opening-balances).

Example: a distributor picks 30 September as its cutover, counts stock that weekend and starts invoicing in the new ERP on 1 October.

Don’t allow postings dated before the cutover, or old and new books will overlap. The [ERP implementation checklist](https://1flux.ai/guides/erp-implementation-checklist) covers the full go-live plan.

In 1flux

Each legal entity has a ledger cutover date. Opening balances and opening stock post on it, and nothing can be posted with an earlier date. [See data import and migration](https://1flux.ai/platform/data-import-and-migration)

Related

## Keep exploring

### [Opening balances](https://1flux.ai/glossary/opening-balances)

The balances you bring into a new system or financial year.

### [Data migration](https://1flux.ai/glossary/data-migration)

Moving records and balances from old systems into a new one.

### [Month-end close](https://1flux.ai/glossary/month-end-close)

The tasks that make a month's books complete, then lock them.

### [ERP implementation checklist](https://1flux.ai/guides/erp-implementation-checklist)

Ten phases from scoping to your first month-end, each with a checklist and a clear test of when it's done.

Last updated 10 October 2026