A digital link is a transfer of data between systems with no manual intervention — the automated path HMRC requires between your records and the figures you file. Linked cells and formulas, imported files the source system produced, API calls and scheduled exports all count. Typing a figure into a box breaks it, and so does copy-and-paste, even between two spreadsheets, because nothing records where the value came from. The rule is what makes Making Tax Digital more than a new submission button: it means every filed figure can be traced back to a source record.
What a digital link is
Under Making Tax Digital, HMRC requires an unbroken digital link between your source records and the figures you submit. A digital link is an automated transfer of data — one that happens without a human re-entering or manually moving the number. The chain can pass through several pieces of software and several spreadsheets; what it can't do is depend on someone retyping a value along the way.
What counts
HMRC treats the following as digital links:
- Formulas and linked cells — a cell that references another, within or across spreadsheets.
- Imports and exports of digital files between systems (for example a CSV emailed and imported).
- API transfers — one system sending data to another programmatically.
- Automated data feeds and download/upload of digital records.
The common thread is that the data moves as data, under the software's control, preserving what the source said.
The classic failure is a person reading a figure off one screen and typing it into another — or copying a cell's displayed value and pasting it as text somewhere else. The moment a number is manually transcribed, the digital link is broken and the audit trail is lost, even if the number happens to be correct.
Why HMRC insists on it
The digital-link rule exists to make the filed figure traceable and tamper-resistant. If every step from source record to submission is an automated link, then the number HMRC receives can be reconciled back to the transactions behind it. Manual re-keying doesn't just risk a typo — it severs that traceability, which is exactly what MTD was designed to remove. The soft-landing period during which manual transfers were tolerated has ended; the links are now expected to be in place.
Where firms slip
Most break-points aren't the big system-to-system transfers — they're the small manual adjustments at the end. A VAT figure nudged by hand for a partial-exemption tweak, a total copied into the return "just this once," a spreadsheet where someone overtypes a linked cell. Each one is an invisible break in an otherwise compliant chain.
How bridging software keeps the link
This is the core job of Qgentic MTD: it reads the VAT figures straight from your records over a digital link, computes the nine boxes rather than accepting a pasted total, and submits the exact result to HMRC — so the figure filed is provably the figure your records produced, with an audit trail to prove it. Nothing is re-typed between your books and HMRC. See a real return keep its link intact in the live demo.
Qgentic preserves the digital link end to end — the figure HMRC receives is provably the figure your records produced.
See the MTD platform Try the live demo