Switching MTD Software Mid-Year: How to Do It Safely

Sometimes the software you chose is not working out. Perhaps it is too complicated, too limited, or your accountant recommends something different. Switching mid-year is possible, but you need to handle the transition carefully. Here is how.

Before You Switch

Export all your data. Download a complete export of your transactions, categories, and any receipts stored in your current software. Most tools offer CSV export.

Note your submission history. Record which quarterly updates you have already submitted and their reference numbers. Your new software needs to know what has already been filed.

Check your new software can import. Confirm that your new choice accepts data imports and can accommodate mid-year transitions.

Tell your accountant. If your accountant has access to your current software, they need to know about the switch and set up access to the new tool.

The Migration Process

Step 1: Set Up Your New Software

Create your account, configure your business details, and set up your expense categories. Connect your bank account via Open Banking.

Step 2: Import Historical Data

Import your year-to-date transactions from the CSV export. Verify that the categories, dates, and amounts match your previous records.

Step 3: Link to HMRC

Authorise your new software to access your MTD account through the Government Gateway. Your old software's authorisation may need to be revoked.

Step 4: Verify Submission History

Ensure your new software reflects which quarterly updates have already been submitted. You do not want to accidentally re-submit or miss one.

Step 5: Run in Parallel (Optional)

If you are nervous about the switch, run both systems for the remainder of the current quarter. Compare the figures to ensure consistency.

Step 6: Complete the Switch

Once you are confident in your new software, deactivate your old account. Keep the old data accessible for record retention purposes.

Common Pitfalls

Losing receipt images. If your old software stored receipt photos, export or download them before cancelling your account.

Double-counting transactions. If your new software imports bank transactions from your connected bank, you may get duplicates with your imported historical data. De-duplicate carefully.

Missing the next deadline. During the transition, keep a close eye on upcoming submission deadlines. Do not let the switch cause you to miss one.

Making It Easier

The best time to switch is at the start of a new tax year (6 April), when you have a clean starting point. If you must switch mid-year, do it just after submitting a quarterly update — this gives you maximum time before the next deadline.

Accounted supports data imports and makes mid-year transitions as smooth as possible.

MTD is coming. Accounted is already compliant. Start free and be ready before the deadline.