MTD Bridging Software Explained: What It Is and Why You Need It

You'll see the term "bridging software" a lot when researching Making Tax Digital. Here's what it actually means and whether it's what you need.

The simple explanation

Bridging software is a tool that takes data from your existing records — usually a spreadsheet — and submits it to HMRC in the format their system requires. It's the bridge between how you keep your books and how HMRC wants to receive them.

Why does it exist?

HMRC requires MTD submissions to be sent digitally through their API. You can't just email them a spreadsheet or type numbers into a web form. The data has to arrive through compatible software.

Full accounting platforms like Xero and QuickBooks include this capability built in. But if you don't use accounting software — if you keep your records in Excel or Google Sheets — you need something to handle just the submission part. That's bridging software.

What bridging software does

• Reads your turnover and expenses from your spreadsheet
• Connects to HMRC using your Government Gateway credentials
• Submits your quarterly figures through HMRC's API
• Stores a record of what was submitted

What bridging software doesn't do

• It doesn't replace your spreadsheet or change how you keep records
• It doesn't do bookkeeping, invoicing, or bank reconciliation
• It doesn't categorise your transactions
• It doesn't calculate your tax

It does one job: get your numbers from point A (your spreadsheet) to point B (HMRC).

Is bridging software HMRC-approved?

HMRC maintains a list of compatible software for Making Tax Digital. Bridging software that connects through their official API and meets their requirements can appear on this list. Always check that the tool you choose is HMRC-recognised.

How Flonancial works as bridging software

Flonancial is free bridging software designed for sole traders and landlords who use spreadsheets. Upload your file, click on the cells containing your totals, review, and submit. Your spreadsheet is parsed in your browser — it never leaves your device.