Cheap MTD Bridging Software: What It Won't Do

Every few weeks the same question appears on accountancy forums: what is the cheapest bridging software that will get a quarterly update to HMRC? It is a fair question. Under Making Tax Digital for Income Tax, submission is a compliance cost, not a service you can charge much for, so paying enterprise money for it makes little sense.

But the price comparison hides a more useful question. Cheap bridging software is cheap because it does one narrow job extremely well. Knowing exactly where that job starts and ends is what stops the first quarter being painful.

What bridging software actually does

A bridging tool is a pipe. You point it at cells in a spreadsheet, map those cells to the categories HMRC expects, and it transmits the totals through the Making Tax Digital for Income Tax API. HMRC maintains a list of compatible software, and the cheap end of that list is genuinely capable.

What a pipe does not do is inspect what flows through it. If cell B47 contains a personal transfer that has been categorised as a business expense, the pipe transmits a business expense. If a letting agent statement has been pasted into the workbook twice, the pipe transmits both copies. The submission succeeds. The figures are wrong.

Why that gap matters more this year than it looks

HMRC has confirmed there are no penalty points for late or incorrect quarterly updates in the first year. That sounds like breathing room, and in one sense it is. But two things still bite.

First, a quarterly update is cumulative: each one restates the year to date. An error introduced in the first quarter does not stay in the first quarter. It follows you to the annual return, where the figures do matter and where the correction has to be explained.

Second, the annual return cannot be filed at all unless every quarterly update for the year has been submitted. The soft landing removes the penalty, not the obligation.

The work that sits before the pipe

For anyone keeping records in Excel or Google Sheets — and that is still a large share of sole traders and landlords — the real quarterly workload is not the submission. It is everything that happens before it:

• Consistency. The same supplier described three different ways across three months becomes three different lines in your totals.
• Duplicates. Bank exports and manual entries overlap more often than people expect, particularly where a business has more than one account.
• Categorisation. Drawings coded as expenses, capital purchases coded as repairs, mortgage interest treated as a straight deduction rather than a restricted finance cost.
• Date boundaries. Transactions dated a day either side of a quarter end landing in the wrong period.
• Sign errors. Refunds entered as positive figures, inflating both income and expenditure.

None of these stop a submission going through. All of them change the numbers HMRC receives.

A practical way to choose

When comparing options, run the comparison on your worst file, not your tidiest one. Take the messiest client workbook — or, if you are a sole trader, the quarter you did not keep on top of — and put it through each tool you are considering. Then look at what came back.

Ask three questions:

1. Did it flag anything at all on import, or did it silently accept everything?
2. Can you see the totals it produced broken down by category before you file, in a form you could hand to a client?
3. If HMRC queried a figure in eighteen months, could you reconstruct how it was arrived at?

A tool that answers all three is worth more than one that is ten pounds cheaper. A tool that answers none of them is fine — as long as you have done the checking somewhere else first.

Where the cleaning step fits

There is no rule that says one piece of software has to do both jobs. Plenty of practices run a tidy-and-check step over the spreadsheet, then use whichever cheap compatible tool they prefer for the actual filing. Keeping the two separate also means you are not locked in: if a filing tool disappoints, you swap it without rebuilding your bookkeeping.

That separation is the thinking behind TaxPrepUK. It takes a messy Excel, CSV, OFX or QIF file, classifies and validates the transactions, runs a set of health checks for duplicates and miscategorisations, and produces a clean quarterly summary plus a report you can keep on file. It prepares the data; it does not file it. The filing stays with whichever compatible tool you have chosen.

The short version

Cheap bridging software is not a compromise. It is a correctly-priced tool for a narrow job. The mistake is assuming the narrow job is the whole job. Decide where your checking happens before the quarter closes, and the submission itself becomes the five-minute task it should be.