Bridging Software for Spreadsheet Users
You can keep your spreadsheet for MTD. Here's exactly what bridging software does, what the digital link rule actually means, and when this genuinely is the right call.
What bridging software actually does
Bridging software connects your spreadsheet to HMRC. It reads the totals you've already worked out and submits them as your quarterly update, or your year-end tax return if the product covers that too. That's the whole job.
What it doesn't do matters just as much. Bridging software doesn't keep your records for you, and it doesn't check them. The spreadsheet itself has to be your proper digital record, accurate, complete, kept up to date as you go. If your spreadsheet has gaps or mistakes, the bridging tool will submit those gaps and mistakes faithfully. It's a courier, not an accountant.
One thing worth saying plainly: a lot of guidance on this steers people away from bridging software, often because the accountant giving the advice can't see a client's spreadsheet the way they can see inside cloud accounting software, or because they're paid a referral fee by the cloud platform they're recommending instead. Neither of those is a reason bridging software is unfit for purpose. We support it directly, for the clients it genuinely suits, and we'll say more about who that is further down this page.
The digital link rule, properly explained
This is the part most guidance on bridging software gets vague about, and it's the part that actually matters. The principle behind the rule is simple: once a figure exists in digital form, it has to stay digital all the way to HMRC. No one re-types it, no one copies and pastes it, anywhere along the way.
In a compliant setup, your bridging software reads your totals straight out of your working spreadsheet, either through a formula that sums a column automatically, or by importing the file and pulling the figure itself. The number that reaches HMRC was generated by a calculation or an import. A person never typed it in.
The same rule applies whether you've got one spreadsheet or several. If you're a landlord with two properties, or a sole trader with a separate sheet for each income source, every total feeding into your submission needs to flow through the same kind of automatic link, not get manually combined into a "master" figure first.
What counts as a digital link:
- A direct API connection between your software and HMRC
- An import from your bank feed
- A formula linking two cells in the same spreadsheet, or between two tabs
- Bridging software importing a file and reading the totals itself
What doesn't count:
- Copying a figure and pasting it into another cell or file
- Manually re-typing a total you've already worked out
- Printing a report and keying the numbers back in somewhere else
The mistake that catches people out
Here's the scenario we see most often, and it's not careless, it's actually the opposite. Someone keeps a perfectly good working spreadsheet through the quarter, invoices in one column, expenses in another, the kind of sheet that does the job but looks a bit untidy. A few days before the deadline, they open a fresh tab, or a new file, and type the quarter's total in by hand, reading it straight off the working sheet, because they want something clean to hand over to the bridging tool.
That single act breaks the digital link. The figure is completely accurate. It doesn't matter. HMRC's rule isn't about whether the number is right, it's about whether a person's eyes and fingers were the thing that moved it from one place to another. The moment you read a number and type it in somewhere else, the chain is broken, however careful you were.
The fix is straightforward once you know to look for it: build your "tidy" summary as a formula that pulls from the working sheet automatically, rather than typing the total into it by hand. If the summary updates itself when the working sheet changes, the link holds. If you're the one updating it, it doesn't.
This is what the penalty framework covers. A record-keeping penalty of up to £3,000 can apply where MTD digital record-keeping requirements are not met, including where required digital links are broken. It is not generally charged automatically. This is separate from the late-submission penalty system.
This is Income Tax bridging, not VAT bridging
Most existing guidance on bridging software is written about VAT, where the rules are older and simpler. If you've read something about bridging software that mentioned an End of Period Statement, it is out of date for MTD for Income Tax. The current process is four quarterly updates followed by your MTD tax return.
What it costs
Bridging software for Income Tax typically runs to somewhere between £30 and £50 a year. That's a category figure, not a quote for any specific product, and it's worth checking current pricing before you commit, but it gives you a sense of scale next to full cloud accounting, which usually runs £7 to £40 or more a month.
When bridging genuinely suits you, and when it doesn't
We're not going to hedge on this. Bridging software is a real recommendation for the right client, not a fallback we tolerate because someone insists on keeping their spreadsheet.
Bridging suits you if:
- You have one or two income sources
- Your transaction volume is low to moderate
- You already keep a tidy, well-organised spreadsheet
- You don't need bank feeds, invoicing, or the other features full accounting software bundles in
Bridging doesn't suit you if:
- You're VAT-registered with a high transaction volume
- You have several income sources and would rather one tool handled all of them together
- Your records aren't currently well organised. Bridging software won't tidy up messy records, it only submits whatever you give it
We support clients on bridging software the same way we support clients on full cloud accounting: we'll run your quarterly updates and your year-end tax return filing either way. The right setup is whichever one suits how you actually work, not whichever one happens to be easier for us.
One thing to check before you commit
Some bridging products only handle quarterly updates, not the year-end tax return. That's a real gap in some tools on the market, not a vague caveat. Check the product you're considering covers both before you rely on it for the full year.
Common questions
Yes, provided it's connected to HMRC through bridging software with a proper digital link. The spreadsheet itself becomes your digital record, so it needs to be accurate and kept up to date, the same as any other record-keeping method.
Anything that moves a figure automatically, an API connection, a bank feed, a formula between cells, or bridging software importing a file. Copying, retyping, or printing-then-re-keying a number breaks it, even if the figure itself is correct.
No. VAT bridging is older and simpler. Income Tax bridging has to handle multiple income sources, so check any product you're considering is built for Income Tax specifically, not just carried over from VAT.
No. The End of Period Statement was dropped from MTD for Income Tax before it launched. If something you've read mentions it as a current step, it is out of date.
Not all of them will. Many steer clients toward cloud accounting instead, partly because it's easier for them to see your records that way. We support bridging software directly where it suits the client, and run the same quarterly filing service either way.
This page is general guidance, not advice for your own circumstances. It was correct as at the date shown at the top, and tax rules and rates change over time. Please take advice on your own position before acting on anything here.
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