How to switch accounting software: UK guide

Switching accounting software is one of those tasks that looks manageable on paper but carries real risk if it's not handled carefully. Get it wrong, and you face corrupted data, missed VAT deadlines, compliance gaps, or days of operational disruption. Get it right, and you end up with a faster, more capable system that supports your business for years ahead.

For UK small businesses, the stakes are higher than in some other markets. HMRC has specific record-keeping requirements, Making Tax Digital is already in force for VAT and expanding to income tax from April 2026,¹ and GDPR rules apply whenever financial data containing personal information, including when it's transferred between systems.²

This guide gives you a clear, step-by-step framework for switching accounting software, from planning and compliance through to data migration, verification, and integration. We’ll also touch on how Wise Business can integrate seamlessly with your accounting software, enabling you to manage domestic and global payments with ease.

💡 Learn more about Wise Business

Why consider switching accounting software?

Most businesses switch for one of several reasons: their current software has grown too limiting for their needs, costs have increased without matching improvements, the interface is slowing the team down, or a new compliance requirement, such as Making Tax Digital for Income Tax, demands a more capable tool.¹

Cloud-based software has also changed expectations. Modern platforms offer automated bank feeds, real-time reporting, direct VAT submissions to HMRC, and integration with CRMs, payroll tools, and payment platforms. If your current system doesn't support these, you're likely spending more time on manual tasks than you need to.

How to plan your accounting software switch

A structured plan is the difference between a disrupted migration and a smooth one. Before touching any data, work through the following.

• Define your goals: what specific problems is the new software solving? Better multi-currency support, cleaner VAT reporting, automated bank reconciliation, Making Tax Digital compliance? Being specific helps you evaluate whether the new tool actually meets your needs before you commit.
• Budget for the full cost: the subscription fee is rarely the only cost. Factor in any overlap period where you run both systems in parallel, staff training time, accountant consultation fees, data migration support if needed, and customisation costs for any integrations. Ignoring these costs leads to unpleasant surprises.
• Create a realistic timeline: avoid peak trading periods. A switch during year-end or a busy VAT quarter creates unnecessary risk. Plan enough time for data export, testing, training, and a parallel running period.
• Audit and clean your existing data: this step is frequently skipped and almost always regretted. Migrating messy data produces messy results. Remove duplicates, close off inactive accounts, correct known errors, and archive records you don’t need to carry forward.
• Involve your team: your finance staff will use the new software daily. Involve them in the evaluation and planning process. Their insight into daily workflows is valuable, and their buy-in reduces resistance during the transition.

Should you migrate data or start fresh?

This is a genuine decision, not just a default. Migrating all historical data gives you continuity and means you can run comparative year-on-year reports without switching between systems. However, it's more complex, takes longer, and carries higher risk if the data is poor quality.

Starting fresh, recording only opening balances and moving forward from a clean date, is simpler and faster. It works well if your historical data is patchy, your business has changed significantly, or your reporting needs don't require historical trends in the new system.

Whatever you decide, keep a complete, accessible backup of your old system. HMRC can request records from previous years, and your retention obligation continues regardless of which software holds them.¹

UK data privacy and HMRC compliance during migration

Two regulatory areas require specific attention when switching, GDPR and tax:

• GDPR and data protection: your accounting software holds personal data: customer names, addresses, payment histories, supplier details. Any transfer of this data to a new system must comply with UK GDPR. Ensure your new provider has adequate data protection measures in place and that the transfer is documented. If you are using a third-party migration service, verify they are a data processor under a formal agreement.³
• HMRC record-keeping requirements: limited companies must keep accounting records for at least six years from the end of the last financial year they relate to.⁴ Self-employed individuals must retain records for at least five years after the 31 January Self Assessment deadline for the relevant tax year.⁵ Your software switch doesn't change this obligation. Accessible, readable records must be maintained throughout and beyond the migration.
• Making Tax Digital: if you are VAT-registered, your new software must be MTD for VAT compliant and allow direct submission to HMRC. For sole traders and landlords with income over £50,000, MTD for Income Tax becomes mandatory from 6 April 2026.¹Confirm your new software is on HMRC's approved list and supports your specific income sources before committing.
• VAT during transition: ensure your VAT records are complete in your old system before the switch. Run any outstanding VAT returns before migrating. If your VAT period straddles the migration date, plan carefully with your accountant to ensure there aren't gaps or duplicated entries.

How to migrate your accounting data

• Export from your old system: most accounting platforms allow CSV or Excel export of transactions, contacts, charts of accounts, and balances. Check what is included, some systems exclude historical transaction detail and provide only summary balances. Know what you're getting before you rely on it.
• Map data to the new system: this is where mismatches occur. Account names, categories, and formats differ between platforms. Work through the mapping carefully: a category called "Office Costs" in one system, may need to sit under a different code in the new one. Mismatched mapping produces reporting errors that can be difficult to trace later.

Common pitfalls to avoid:

• Incorrect data mapping between account codes
• Data truncation where field length limits cut off entries
• Migrating duplicate or incomplete records that were already problems in the old system

Run a test import on a subset of data before committing to the full migration. Most platforms offer a sandbox or trial environment where you can check the result before going live.

Verifying data integrity post-migration

Don't go live without completing these checks.

• Reconcile opening balances: every account balance in the new system should match the closing balance from the old one. Any discrepancy needs to be identified and resolved before you start processing new transactions.
• Check key reports: run a profit and loss statement, balance sheet, and aged debtors and creditors report in both systems. They should agree. If they don't, work backwards through the migration to identify where the difference originated.
• Sample test transactions: pick a selection of invoices, payments, and journal entries at random and verify they appear correctly in the new system. Check customer and supplier records for completeness.
• Involve your accountant: post-migration validation is a task worth doing with professional support. An accountant can catch discrepancies that are easy to miss when you're close to the detail.

Run both systems in parallel for at least one reporting cycle before fully decommissioning the old one. This's the most reliable safety net available.

Integrating your new accounting software

Once data is validated and you're live, turn attention to integrations.

• Bank feeds: set up your direct bank feed connection and test it thoroughly. Confirm transactions are importing correctly and that the starting date is right.
• Other business tools: reconnect any integrations with payroll, CRM, e-commerce platforms, or expense management tools. Check that data flows correctly in both directions and that no transactions are being lost or duplicated at the connection points.
• Workflow review: a software switch is an opportunity to improve processes, not just replicate them. Review how your team completes common tasks in the new system and identify where automation can reduce manual effort going forward.

Integrate payments and accounting seamlessly with Wise Business

For UK businesses that handle international transactions, a software switch is also an opportunity to improve how multi-currency payments are managed.

Wise Business integrates directly with Xero, QuickBooks, FreeAgent, and FreshBooks. When you connect Wise Business to your new accounting software, international transactions sync automatically, and the correct exchange rate is recorded against each transaction at the time it occurs, rather than requiring manual entry or reconciliation adjustments later.

This matters for data integrity. If your previous system required manual FX entries, those entries introduced the risk of errors. Automated sync from Wise Business removes that risk. Wise Business uses the mid-market exchange rate with low, transparent fees, so the amount recorded in your books matches what actually moved, which simplifies both reconciliation and VAT reporting on cross-border transactions.

For UK businesses making or receiving regular international payments, connecting Wise Business to your new accounting software from day one means you start with cleaner data and less admin from the start. Explore Wise Business for managing international payments.

With Wise Business, you can:

• 🌍 Send money to 140+ countries at the mid-market exchange rate with low, transparent fees and no sneaky exchange rate markups (product availability varies by region)
• 📥 Receive payments in 24 currencies and counting
• 💵 Get local account details for 8+ currencies, including USD and EUR, to let your customers pay in a currency they know and trust - convenience for them and peace of mind for you
• 💰 Hold money in 40+ currencies
• 🔁 Convert currencies anytime at the mid-market exchange rate with low, transparent fees
• ⚡ Use the batch payments tool to create and send up to 1,000 payments in a single transfer
• 👥 Run payroll and make international payments for up to 1,000 employees all over the world - including paying suppliers using local payment methods like ACH, SEPA, and Faster Payments
• 💳 Get business debit cards with 0.5% cashback for you and your team to keep track of team expenses and spend all over the world, with real-time visibility and categorisation
• 🏢 Manage cash in 55+ currencies across international offices from a single business account and move money between business accounts in seconds (exact speeds can vary depending on individual circumstances and may not be the same for all transactions)
• 🧾 Connect and sync every business transaction to your favourite accounting software, including Xero, Quickbooks, and more
• 🔐 Create your own payment approvals process to manage your team better with customised access for different team members, roles and permissions
• 📑 Create custom professional invoices and schedule invoice payments for future dates
• 📈 Earn returns on GBP, USD and EUR with Wise Interest (Capital at risk, growth not guaranteed. Your money is at risk if governments default or interest rates go negative. Visit https://wise.com/gb/interest/ to find out more)
• 🔗 Create payment links and QR codes to get paid easily (Card payment acceptance for new Wise Business customers is currently unavailable. Payment methods subject to eligibility and availability.)
• ⚙️ Automate payouts with the Wise API (comes with 24/7 customer support, a sandbox account to test integrations, API tokens, and clear documents on how to implement and make the most of our API)

Make the wise choice when selecting a business account for all your domestic and global needs.

Be Smart, Get Wise.

Register for Wise Business ✍️

Investments can fluctuate, and your capital is at risk. Interest is offered by Wise Assets UK Ltd, a subsidiary of Wise Payments Ltd. Wise Assets UK Ltd is authorised and regulated by the Financial Conduct Authority with registration number 839689. When facilitating access to Wise investment products, Wise Payments Ltd acts as an Introducer Appointed Representative of Wise Assets UK Ltd. Please be aware that we do not offer investment advice, and you may be liable for taxes on any earnings. If you're uncertain, we urge you to seek professional advice. To find out more about the Funds, visit our website.

*Disclaimer: The UK Wise Business pricing structure is changing with effect from 26/11/2025 date. Receiving money, direct debits and getting paid features are not available with the Essential Plan which you can open for free. Pay a one-time set up fee of £50 to unlock Advanced features including account details to receive payments in 22+ currencies or 8+ currencies for non-swift payments. You’ll also get access to our invoice generating tool, payment links, QR codes and the ability to set up direct debits all within one account. Please check our website for the latest pricing information.

Frequently asked questions

How long does it typically take to switch accounting software?

A straightforward migration for a small business with clean data and a simple chart of accounts can take two to five days. A more complex migration, multiple years of historical data, several integrations, or a larger team, typically takes two to four weeks when planned properly. Budget more time than you think you need, and don't schedule a go-live date during a busy trading or VAT period.

What are the hidden costs of switching accounting software?

Beyond the subscription fee, the real costs are: running both systems in parallel during testing (often four to eight weeks of double subscriptions), staff training time and lost productivity during the learning curve, accountant consultation fees for data validation, and any data migration service fees if you engage a specialist. If your integration with payroll, e-commerce, or CRM platforms requires reconfiguration or third-party support, those costs should also be accounted for.

What if my new software doesn't import all my data correctly?

First, don't panic, this's exactly why you retained a full backup of the old system. Identify the specific records that are missing or incorrect by comparing them against your old system. Re-export the affected data and check whether the issue is with formatting, field mapping, or data quality in the source file. Contact your new software provider's support team with specific examples. This is another reason to run both systems in parallel until you're confident the migration is complete.

Sources used:

Sources last checked on 17-May-2026