Making Tax Digital (MTD) is the biggest shift in UK tax administration in a generation. Since April 2019, VAT-registered businesses above the £90,000 threshold have been required to keep digital records and submit returns via MTD-compatible software. The next wave — MTD for Income Tax Self Assessment (ITSA) — begins in April 2026 for sole traders and landlords earning above £50,000. For many businesses, the scramble to comply has meant bolting on a piece of so-called bridging software as a quick fix. But that fix comes with a cost. BizHub365 was built from the ground up with direct HMRC API connectivity, which means bridging software was never part of the plan — and that matters far more than it might first appear.
What Is Bridging Software, and Why Does It Exist?
Bridging software is essentially a translator. If your existing accounting system — whether that is an old desktop package, a spreadsheet, or a basic invoicing tool — cannot speak directly to HMRC's MTD APIs, you need something in the middle to take your figures and forward them on. The bridging tool reads your data (often from a spreadsheet), packages it into the correct API format, and fires it to HMRC on your behalf.
It sounds straightforward enough. In practice, it introduces a chain of steps that each carry their own risk. You export data from your accounting tool, you import or paste it into the bridging software, you map the fields correctly, and then you submit. Every hand-off is an opportunity for human error. A misaligned column in a spreadsheet or a copied figure from the wrong VAT period can result in an incorrect return — and HMRC is not particularly sympathetic to errors that originate in a broken manual process.
Bridging software also costs money. Products like Absolute Tax, DataDear, or various Excel-based tools typically charge a monthly or annual subscription. For a sole trader already watching every pound, that is an additional overhead for a problem that should not exist in well-designed software.
The MTD Digital Links Requirement — and Where Bridging Goes Wrong
HMRC's MTD rules do not just require digital submission; they require a fully digital journey. The regulation speaks of "digital links" — meaning data must flow electronically from your source records through to the final submission without any manual re-keying at any stage. A copy-and-paste operation, even between two pieces of software on the same machine, breaks the digital link.
This is where bridging arrangements can become legally precarious. If you export a CSV from your accounts, open it in Excel, manually adjust a figure, and then import it into your bridging tool, you have broken the digital link. HMRC's compliance checks are becoming increasingly sophisticated, and the department has made clear that it expects businesses to be able to demonstrate a clean, unbroken audit trail from source records to submission.
A further complication arises with VAT groups, partially exempt businesses, or those with complex reverse-charge transactions. The more adjustments that need to be made outside the core accounting system, the more brittle a bridging-based workflow becomes.
How BizHub365 Connects Directly to HMRC
BizHub365 is a recognised MTD-compatible software solution that holds a direct connection to HMRC's official APIs — both for MTD VAT and for ITSA. There is no intermediary, no bridging layer, and no spreadsheet in the chain. When a VAT return period closes, the figures are calculated automatically within the platform using the double-entry bookkeeping engine, and the submission travels directly to HMRC's systems at the click of a button.
The platform handles the OAuth 2.0 authorisation that HMRC requires, manages the API token refresh cycle, and surfaces any HMRC-side errors or acknowledgements directly within the interface. A business owner in Leeds running a VAT-registered consultancy, for example, can reconcile their bank transactions on a Monday morning, review their VAT liability on the built-in dashboard, and submit their return to HMRC — all without leaving BizHub365 and without touching a third-party tool.
For payroll, the same principle applies. BizHub365 submits Full Payment Submissions (FPS) and Employer Payment Summaries (EPS) to HMRC in real time via the RTI (Real Time Information) API, meaning PAYE reporting is equally direct and equally free of bolt-on tools.
Why This Particularly Matters for Accountants and Bookkeepers
If you are an accountant or bookkeeper managing VAT returns for ten, twenty, or fifty clients, the maths of bridging software becomes painful very quickly. You may be paying for multiple bridging licences, maintaining separate spreadsheet templates for different client types, and spending billable hours managing the data-transfer workflow rather than delivering actual advisory value.
With BizHub365, an accountant can manage multiple client entities under a single practice login. Each client's records are maintained in one place, VAT obligations are visible at a glance, and submissions are made directly to HMRC without any intermediate steps. That is not just a convenience — it is a genuine reduction in professional risk. Fewer hand-offs mean fewer opportunities for the kind of clerical errors that generate penalty notices and awkward client conversations.
As MTD for ITSA approaches, the stakes rise further. From April 2026, sole traders and landlords above £50,000 will need to submit quarterly updates to HMRC, followed by a final end-of-period statement and an annual declaration. That is up to five submissions per client per year, compared with one under the current Self Assessment regime. Managing that volume through bridging software and spreadsheets would be, frankly, unsustainable for most practices.
Preparing Now Rather Than Scrambling Later
The businesses and practices that will find the April 2026 ITSA deadline straightforward are the ones that have already adopted software with native HMRC connectivity. Migrating accounting data, retraining staff, and rebuilding workflows under a deadline is far more stressful — and more expensive — than making a considered move now.
There are practical steps you can take today. Start by auditing your current MTD workflow: count how many manual steps sit between your source records and your HMRC submission. If the answer is more than zero, you have a digital-link risk. Next, check whether your current software is on HMRC's list of MTD-compatible products — being on the list does not automatically mean direct API integration, as many listed products still require bridging for certain return types.
If you are a sole trader keeping records in a spreadsheet, BizHub365 offers a straightforward onboarding process that pulls transactions in via bank statement import — powered by AI receipt scanning and categorisation — so you can move from spreadsheet chaos to a clean, MTD-compliant digital record relatively quickly.
Conclusion: The Bridge You Never Have to Build
Bridging software exists because legacy tools were not built with MTD in mind. It was a pragmatic workaround for an industry caught off guard by HMRC's digital transformation agenda. But workarounds have a habit of becoming permanent fixtures, and in this case that permanence carries real compliance risk, ongoing cost, and operational friction.
BizHub365 was designed with HMRC's digital future as a given, not an afterthought. Direct API connectivity for MTD VAT, RTI Payroll, and ITSA means that every submission follows an unbroken digital path from your records to HMRC's systems — exactly as the legislation requires. For UK small businesses, sole traders, and accountants who want compliance without complexity, that is a compelling reason to leave the bridge behind entirely.