Accounting software migration: A guide for growing and multi-entity businesses

The real risk of staying on a system that no longer fits

Most finance teams choose accounting software migration when staying put on legacy or entry-level platforms begins to pose serious business risks. However, while migration is a solution, many business leaders fear the possibility of functional disruptions to their daily operations.

In reality, the major barriers involved in migration aren’t inherent to migration itself. They often spring from poor migration planning and execution. But despite the risks, accounting software migration is a necessity for growing businesses and multi-entity organisations.

In this iplicit guide, we’ll cover everything a finance team, finance director or group FC needs to know for a successful accounting software migration.

Our track record

At iplicit, we’ve successfully helped top UK mid-market finance teams migrate from systems such as Sage, Xero, and Exchequer. We have seen where migrations stall, which data issues are noticed late in the process and what separates a clean cutover from a painful one. This guide reflects what we have learned from those implementations.

What is accounting software migration?

Accounting software migration is the process of moving your financial data, configurations, workflows and integrations from one accounting or finance software to another. In most cases, converting all your data to a format that the new system can read is also necessary. A typical migration takes care of:

• The chart of accounts structure
• The opening balances
• Historical transactions
• Approval workflows
• User roles
• Intercompany rules
• Integrations with payroll or CRM systems
• Reporting configurations

This process is relatively contained if the business has a simple single entity. But for a bigger company with multiple legal entities and many other complexities, migration is more complicated. In both cases, detailed planning is key.

Why businesses need to migrate

Besides the common increase in operational volume, there are other reasons why a business might need to modernise its finance system. Let’s take a look at why businesses choose to migrate:

1. Growth brings more burden

When a business crosses a certain revenue threshold, its operations see a drastic change. Their:

• Transaction volumes increase
• Chart of accounts becomes more complex
• Teams and staff numbers grow
• Month-end close starts taking longer
• Presenting reliable numbers to your board gets ever harder.

These changes might not happen all at once but they are inevitable for any scaling business. Without migration, the accounting software that the business once relied on forces the creation of manual workarounds to compensate for what it cannot do natively.

2. Multi-entity complexity is a separate pressure

Most entry-level accounting software isn’t built for multi-entity businesses by default. Xero, for example, requires you to subscribe separately for each entity because it has no native consolidation.

Systems that aren’t built for multi-entity leave many tasks for you to handle manually. Those could include intercompany eliminations, shared cost allocations or even intragroup loans. This quickly becomes unmanageable.

3. Structural events force the question

Sometimes, the decision to change systems comes from a specific event. That event could be a new regulatory requirement, such as HMRC's Making Tax Digital for Income Tax obligations, which the old system doesn’t address. Or a new funding round might have reporting obligations that the current system cannot meet.

4. The system is slow, unstable or approaching end-of-life

Some older systems, particularly desktop-based ones like legacy versions of Sage or Exchequer, begin to degrade as data volumes increase, especially during peak periods. In some cases, the software vendor will formally announce an end-of-life date, which means security patches and compliance updates will stop. This becomes a problem with potentially major implications.

Common migration challenges and risks

Accounting or finance software migration does carry risks. If something goes wrong during migration, the consequences can be painful. But the first step to mitigating those risks is to know what to avoid. Here are some of the most common risks of accounting software migrations:

1. Data quality problems

Finding out that the existing data is in worse shape than originally thought is more common during migration than it is before. However, finding and addressing such problems beforehand makes migration a lot quicker and safer.

For example, a multi-entity organisation might discover during migration that two subsidiaries have been using different supplier codes for the same vendor for years. In the old system, nobody noticed because each entity was managed separately. But when the data is brought together in a single platform, those duplicates create mismatches in aged creditor reports and purchase history.

2. Data mapping complexity

For a business with multiple entities, each with slightly different chart of accounts structures, the mapping work multiplies accordingly. A mistake in data mapping can mean that historical comparatives do not reconcile, which creates reporting problems that take time to unpick after go-live.

For instance, you could have a group with five entities, each using a slightly different numbering convention for overheads. If those codes are mapped incorrectly, a board-level P&L might show office costs doubling in one entity and disappearing from another.

The numbers are technically in the system but they are in the wrong place. The finance team ends up spending the first month after go-live reconciling reports instead of running them.

3. Integration re-mapping

When you switch the core accounting system, your existing integrations need to be reviewed and, in many cases, rebuilt. Treating integration work as a secondary concern during migration creates problems post-go-live. You might discover that the payroll sync is broken, or that purchase invoices are not flowing through correctly from the AP platform.

A common scenario is a payroll integration that was built years ago using a custom CSV export. The old system produced the file in a specific format, and the payroll provider was configured to read it. When the new system generates a different file structure, the payroll run fails on the first cycle. If this isn't tested before cutover, the finance team discovers it on the day salaries are due to be processed.

4. Risky cutover timing

The cutover point is when the old system stops being the live system and the new one takes over. Getting this timing wrong or not having clear procedures for what happens in the days immediately before and after the cutover is a common source of problems.

For example, migrating right in the middle of a VAT period means the team will be closing a period across two systems. The finance team will have to pull transaction data from the old system for the first half of the period and from the new system for the second. What should be a routine submission turns into a two-day manual reconciliation exercise with a real risk of errors.

5. Compliance risks

For UK businesses, compliance with HMRC and Making Tax Digital requirements is a primary concern. If historical records are not properly archived or accessible in the new system, and the old system is decommissioned too quickly, your business can end up without an adequate audit trail.

This is particularly common when the old system is desktop-based and the licence is cancelled shortly after migration. Six months later, an auditor might ask to see a transaction from the previous year. Only then do you discover the data was never exported, the system can no longer be accessed and the finance team has no way to produce the record.

To reduce this risk, iplicit supports migration of seven years or more of historical data as part of setup. That means the new system becomes the single reference point for financial records, so there is no need to keep a legacy system running purely for historical access.

Step-by-step migration process

The steps of an accounting software migration vary from case to case. But the underlying sequence of steps is largely consistent. The following are the core steps of a well-run migration:

Step 1: Define scope and appoint an owner

Before anything else, someone needs to be responsible for decisions, timelines and sign-off of the project.

Usually, that person is the Financial Controller or Head of Finance. This person will then decide the scope of the rest of the project.

Without a single owner:

• Decisions stall between departments
• Timelines drift
• And nobody has the authority to resolve disagreements about how the new system should be set up

Step 2: Audit and clean your existing data

The accumulated clutter of your existing system shouldn’t travel into the new system. Cleaning your data before the migration is important because the required effort will be considerably less than the effort spent untangling it afterwards.

If you skip this step, duplicate suppliers, orphaned nominal codes and unreconciled balances all travel into the new system, where they become harder to identify and slower to fix.

Step 3: Map the chart of accounts

The charts of accounts in the existing system need to be mapped to the structure in the new one. For multi-entity businesses, this also involves aligning charts of accounts across entities.

This step requires extra care because, if the mapping is wrong, historical comparatives will not reconcile in the new system. Your finance team could then spend weeks after go-live trying to work out why this year's figures do not match last year's.

Step 4: Run a test migration

In a test migration, the new accounting software is loaded with a test dataset that allows finance teams to check whether:

• Trial balances reconcile
• Reports look correct, or
• The data mapping has produced the right outputs

In our implementations, this step most commonly reveals late issues that need adjusting before going live – and skipping it means discovering those problems on day one of the live system. At that time, the pressure to keep the business running leaves no time to fix them properly.

Step 5: Configure the system and rebuild integrations

While data is being prepared, there are several configurations that need to be set in the new system. Notable parameters include:

• The chart of accounts
• Departments
• Cost centres
• Entities
• Approval workflows
• User roles and permissions
• Any reporting structures

Integrations for payroll, CRM, banking, AP platforms and expense management also need to be built or reconnected at this stage. If integration work is left until after go-live, you risk finding out that your payroll file is in the wrong format or your AP invoices are not flowing through on the first live processing run.

For UK finance teams, iplicit has established migration paths from systems such as Sage 50, Exchequer or Xero that simplify this step. Our UK-based implementation team uses pre-built tooling to handle the configuration alongside your finance team.

Step 6: Decide the cutover date

The financial year-end or the end of a VAT period are two of the best times for cutover because the books are closed. Migrating mid-period is possible but requires careful handling of transactions that straddle the cutover date.

It’s important to put extra thought into this step because if you get the cutover date wrong, your finance team has to pull data from two systems to close the period. This will double the reconciliation work and increase the chance of errors in the first filing after migration.

Step 7: Load opening balances and validate

At this stage, the trial balance, as at the cutover date, is loaded into the new system. Every balance sheet account needs to agree with the legacy system output. That means accounts receivable ageing, accounts payable ageing, bank balances, outstanding purchase orders and accruals all need to be verified individually.

A single balance sheet account that does not agree between the old and new systems will create a discrepancy. This error will follow the business through every subsequent reporting period until it is found and corrected.

Step 8: Go live and monitor closely

The formal go-live is when the new system becomes the only system of record. The finance team lead should be available at the first month-end close to work through anything unexpected. Keep in mind that small issues that appear in this window are normal and should be documented and resolved immediately.

If those issues go unattended, they will emerge weeks later during the first audit or board report, when they are much harder to trace back to their source.

Modern cloud-native systems like iplicit have removed much of the manual work that used to make each step of a migration considerably more time-consuming.

How modern systems simplify migration

Modern, cloud-native accounting software like iplicit eases the effort and disruption of migration. The complex work that used to make projects drag on is significantly reduced.

• No infrastructure needed for setup: There are no servers to configure or local installs to manage before you can start. Modern systems like iplicit are browser-based, so your team can begin working straight away, without extensive IT setup.
• Pre-built migration tooling: Pull data from common source systems like Sage and Xero without bespoke scripts. Where enterprise platforms like NetSuite or Sage Intacct often need third-party consultants to scope and run the migration, iplicit's implementation team has established paths from each of these systems.
• Self-service configuration: Make structural and workflow changes directly through the interface. Your finance team can adjust dimensions, reporting and approvals without waiting on developers or external consultants.
• Open API integrations: Connect payroll, CRM and banking tools using standard API protocols rather than relying on fragile middleware or manual data transfers.
• All features included as standard: Access multi-entity consolidation, approval workflows and spend management as standard. Unlike platforms that lock multi-entity consolidation, approval workflows or spend management behind paid modules, iplicit includes full functionality as part of the core system.

How iplicit supports fast, low-risk implementation

Most of what makes accounting software migration feel risky comes down to not knowing what to expect and not having a team with real experience of the specific software you are moving from. iplicit addresses both these challenges.

Here are some of the benefits of choosing iplicit as your new accounting software:

1. Go live in weeks, not months

Where enterprise systems can take six months or more to implement, iplicit's average go-live is around 22 days. Whether your organisation is moving from Sage 50, Exchequer, Xero or another mid-market system, your migration timeline is well established, so there are no surprises along the way.

For UK finance team leads, that means:

• No six-month consultancy programme
• No dependency on third-party implementation partners
• No extended period running multiple backup systems

You get a defined implementation plan and a fast route to live reporting, so the project doesn’t consume your entire finance function for a quarter.

2. Stop paying to keep your old system running

iplicit can easily support historical data migration of up to seven years or more. Our system will be the single reference point for historical financial records, so:

• Prior-year comparisons sit inside your live reporting environment
• Audit queries don’t require logging into an old system
• Your team works from one source of truth

All this means you won’t have to keep running your legacy system in parallel purely for historical access.

3. Your finance team stays in control of the project

iplicit is designed so your finance team builds and owns the system. That means:

• Your chart of accounts, approval workflows and reporting structures are built by the people who actually use them
• You’re not reliant on an IT team to make day-to-day changes
• You’re not dependent on external consultants to adjust reports or permissions

Support from iplicit's UK-based implementation team will be available throughout the project, but the control stays with your finance function, where it belongs.

4. Work with a team that understands UK finance

iplicit is built for UK-centric finance workflows, accounting standards and compliance requirements, including Making Tax Digital. That means:

• You don’t need to translate US-centric terminology or workflows to fit how your organisation operates
• No offshore support teams that are unfamiliar with HMRC, Companies House or Charity SORP requirements
• No figuring out how MTD, partial VAT or fund accounting should be configured

Your implementation will also be supported by a UK-based expert with years of experience handling migrations from the systems you are moving away from.

5. Know exactly what you are paying for from the start

iplicit’s pricing system is straightforward, with no separate charges for core modules or hidden costs per entity. The full platform, including multi-entity consolidation, approval workflows, reporting and integrations, is available from the outset.

• You’ll get multi-entity consolidation, approval workflows, reporting, and integrations included as standard
• You are not quoted for a base package and then charged extra for the features you actually need
• There are no annual uplift surprises or long-term contract lock-ins

The cost of ownership stays predictable as your organisation grows.

6. Manage your entire group from one system on day one

For multi-entity organisations in particular, our native consolidation architecture means that intercompany eliminations, shared charts of accounts and cross-entity reporting are all configured within the system.

This will give you:

• Intercompany eliminations calculated automatically across entities
• A shared chart of accounts that keeps reporting consistent across the whole group
• Cross-entity reporting in real time without you waiting for manual exports

You will not need to build workarounds in Excel or run a separate instance for each entity. Your entire group will operate from one system from go-live.

While a successful migration still requires detailed preparation and a realistic timeline, what iplicit removes from the equation is the uncertainty, extended project risk and dependency on external parties. These factors have historically made mid-market migration projects feel far more daunting than they need to be.

Your next financial year-end could be the time to move

For growing or multi-entity UK businesses, the decision to migrate isn’t always feature-led. Instead, it’s about gaining control over reporting across entities, audit trails and how quickly you can close the month and present reliable numbers to your board.

Most migration challenges today are born from unclean data, rushed cutover timing and platforms that are not designed for the complexity of your operations. But with iplicit, you can avoid the most common risks and turn your migration into a structured project rather than a disruptive and open-ended one.

Book a demo with iplicit to see how a modern, UK-built, multi-entity finance system is implemented in weeks rather than months.

Sources and review information

Sources: iplicit's own published case studies, including P. Johnson & Son and Corrotherm, and iplicit implementation and product documentation.

This guide was last reviewed on 24 September 2026.