If you've spent any time researching Making Tax Digital (MTD), you've almost certainly encountered the term "bridging software." For many UK sole traders, small business owners, and accountants, it's become one of those necessary evils — an extra piece of technology bolted on to existing spreadsheets or legacy accounting tools just to satisfy HMRC's digital submission requirements. It adds cost, complexity, and yet another login to manage. The good news is that it doesn't have to be this way. BizHub365 was built from the ground up with direct HMRC API integration, which means bridging software is simply never part of the conversation.
What Is Bridging Software and Why Do So Many Businesses Still Use It?
Bridging software sits between your existing records — typically a spreadsheet or an older accounting package — and HMRC's MTD systems. It reads your figures, formats them correctly, and submits them via the HMRC API on your behalf. Think of it as a translator that speaks both "Excel" and "HMRC digital."
The reason so many businesses rely on it is largely historical. When MTD for VAT was first mandated for VAT-registered businesses with a taxable turnover above £85,000 (the threshold at the time of its April 2019 launch), millions of businesses were already mid-cycle with their spreadsheets and accounting systems. Rebuilding everything from scratch felt too disruptive. Bridging software offered a quick fix.
But quick fixes have a habit of becoming permanent arrangements. Many businesses that adopted bridging software in 2019 are still paying for it every month, even though the underlying reason — avoiding disruption — no longer applies. With MTD for Income Tax Self Assessment (ITSA) on the horizon for sole traders and landlords earning above £50,000 from April 2026, now is precisely the right moment to reconsider whether bridging software is still serving you.
How Direct HMRC API Integration Actually Works
HMRC provides a set of secure, government-grade APIs — application programming interfaces — that allow approved software to communicate directly with HMRC's systems. When a platform is built to use these APIs natively, it can submit VAT returns, retrieve obligations, confirm liabilities, and handle the full MTD workflow without any external tool involved.
BizHub365 is a recognised MTD-compatible software provider that connects directly to HMRC's production APIs. When you file a VAT return inside BizHub365, the submission travels from the platform straight to HMRC — no export, no copy-and-paste, no bridging layer. The same architecture supports RTI Payroll submissions (Full Payment Submissions and Employer Payment Summaries) and is built to handle ITSA when those obligations begin.
This matters for accuracy as much as convenience. Every time data passes through an additional system, there is an opportunity for human error or formatting mismatch. Direct integration eliminates those handoff points. Your figures go in once, and HMRC receives exactly what you entered.
The Real Costs of Relying on Bridging Software
The headline subscription fee for bridging software is rarely the full story. Consider the broader picture:
- Subscription fees: Many bridging tools charge between £8 and £25 per month, per VAT entity. For an accountant managing 40 VAT-registered clients, that could mean hundreds of pounds a month in software costs alone.
- Time spent on data transfer: Exporting figures from one system, formatting them correctly, importing into the bridging tool, and then submitting — this process can take 30 minutes to an hour per return. Across a year, that is a material overhead.
- Error risk: Manual data transfers introduce the possibility of transposing figures or referencing the wrong period. A VAT return with an error doesn't just cause administrative pain; it can trigger an HMRC compliance check.
- Version dependency: Bridging tools often require your spreadsheet to follow a precise layout. A formatting change in one cell can break the entire import. Businesses frequently discover this at the worst possible moment — the night before a VAT deadline.
None of these costs appear on a single invoice, which is why they tend to be underestimated. But they accumulate quickly, particularly for practices that manage multiple clients.
MTD for ITSA: Why Getting Off Bridging Software Now Makes Sense
MTD for VAT has been mandatory for the vast majority of VAT-registered businesses since April 2022. MTD for ITSA is next, with sole traders and landlords whose qualifying income exceeds £50,000 required to comply from April 2026, followed by those above £30,000 from April 2027.
ITSA is significantly more demanding than VAT in terms of data requirements. Instead of a single quarterly return, businesses will need to submit quarterly updates of income and expenditure figures, plus a final end-of-period statement and an annual tax return — all digitally, all via compatible software.
Trying to stretch bridging software to cover ITSA obligations will be far more complex than it was for VAT. The volume of submissions increases substantially, and the data flowing through needs to be accurate, categorised correctly, and timestamped in line with HMRC's requirements. A platform that handles this end-to-end — capturing income, categorising expenses, and submitting directly — is not a luxury; it is a practical necessity.
BizHub365 is designed with exactly this in mind. Its double-entry bookkeeping engine, automated receipt scanning (powered by AI), and bank statement import tools mean that the data feeding into HMRC submissions is clean and categorised before submission day arrives — not scrambled together at the last minute.
What Accountants and Business Owners Gain From a Fully Integrated Approach
For accountants in practice, the shift away from bridging software is partly about efficiency and partly about client relationships. When a client's accounting data lives in an integrated platform like BizHub365, the accountant can review figures in real time, identify anomalies early, and submit returns with confidence. There is no chasing clients for exported spreadsheets, no reconciling two systems, and no anxious last-minute uploads.
For sole traders and small business owners, the benefit is simplicity. Running a plumbing business in Leeds or a freelance design studio in Bristol is already demanding. The last thing you need is to maintain a spreadsheet in one format, export it to a bridging tool, log into a separate portal, and hope everything aligns before the deadline. An all-in-one platform that handles your invoicing, expenses, VAT, and payroll — and submits directly to HMRC — removes an entire category of administrative stress from your working week.
There is also a compliance confidence argument. HMRC's MTD rules require a "digital link" between your source data and your submission. With bridging software and spreadsheets, maintaining and evidencing that digital link can be tricky, especially if manual steps are involved. With a fully integrated platform, the digital link is inherent to the system architecture — it is not something you need to document or worry about separately.
Conclusion: The Bridging Software Era Is Coming to an End
Bridging software was a pragmatic response to a sudden regulatory change. For many businesses in 2019, it was the right call. In 2025, with MTD for ITSA approaching and MTD for VAT firmly established, it is increasingly difficult to justify the ongoing cost, complexity, and risk that bridging tools introduce.
The stronger approach — for sole traders, SMEs, and accountants alike — is to work from a platform that speaks HMRC's language natively. BizHub365 does exactly that, connecting directly to HMRC's APIs for MTD VAT, RTI Payroll, and ITSA, while also managing the day-to-day bookkeeping that makes those submissions accurate in the first place. If you are still paying for bridging software every month, it is worth asking what you are actually getting for that money — and whether you need it at all.