The January MTD Reckoning: Eight Weeks to Rescue a Wobbly Digital Tax Set-Up

Making Tax Digital for Income Tax stopped being a pilot project in April 2026. Sole traders and landlords above the £50,000 qualifying-income threshold have been inside the regime ever since, and the practical consequences are only now surfacing in accountants' in-trays. The third quarterly update for 2026-27 falls due on 7 February 2027 — a date that sits close enough to the old 31 January routine to lull people into treating it as business as usual.

It is not. Below is what is going wrong most often, and what an owner-manager can realistically achieve between now and the filing.

The failures turning up most often

Software that was never authorised. HMRC publishes a register of compatible products, and not every bookkeeping app is on it. Nor is a spreadsheet, on its own, usually enough — bridging software exists for precisely that gap. Firms that bought a package on price, or on a recommendation from a peer in the same trade, are discovering the compatibility problem at the worst possible moment in the calendar.

Records that are digital in name only. Photographing a shoebox of receipts in the final week is not digital record-keeping. Transactions need to be captured digitally at or near the point they happen, in a form the software can actually use. A folder of PDFs is not a ledger.

Quarterly updates treated as optional. There is a persistent belief that a quarterly update is only a rough estimate, and therefore skippable when trade is quiet or the figures are embarrassing. Late submission penalty points can accrue even where no tax is due at that stage, and points accumulate across the year.

Unreconciled bank feeds. Automated feeds import duplicates, miss transfers between current and savings accounts, and quietly file a supplier payment under general expenses. Nobody notices until the quarterly figures bear no resemblance to the bank balance.

Personal and business spending through one account. The most common sole-trader habit, and the most tedious to unpick retrospectively. Every coffee, school trip and supermarket shop has to be separated out before the numbers mean anything at all.

There is a sixth problem that is less technical but just as damaging: the agent has never been authorised. An accountant cannot see or file anything until the client grants access through their HMRC business tax account, and that handshake reliably takes longer than anyone expects.

Eight weeks, one job per week

The instinct at this stage is to attempt everything at once, panic, and abandon the effort halfway through the second evening. Resist it. A sequenced plan, one task per week, is far more likely to reach the finish line.

Week one: audit the tooling

List every piece of software in the chain — invoicing, bookkeeping, spreadsheet, bridging product — and check each against HMRC's register. Confirm that the business tax account credentials work and that nobody has changed the password since last spring. Write down precisely what is missing, because a vague sense of dread is not a project plan.

Week two: rebuild the paper trail

Download twelve months of bank and card statements as CSV files. That is the spine of any reconstruction, because statements cannot be argued with. Receipts and invoices get matched to them afterwards; the statements come first. Where a receipt is genuinely lost, note it and move on rather than stalling the whole exercise.

Weeks three and four: cleanse and categorise

This is where the real time goes. Split personal spending from business, settle on a consistent set of categories, strip out duplicate feed entries and park genuinely ambiguous items in a holding pot labelled queries. Two focused evenings a week will usually clear a year of small-trader transactions; three if the account has been used as a personal current account.

Week five: file what is outstanding

Submit overdue quarterly updates oldest first. Late filing is a far better outcome than silence, and the points-based penalty regime is generally more forgiving than the interest and scrutiny that follow months of nothing. Do not attempt to perfect the numbers at this stage — file on the best available evidence and correct later if needed.

Week six: reconcile with the accountant

Book a call, share view-only access and ask them to check the first two quarters before you press on. An hour of review in late November is considerably cheaper than an enquiry next summer. This is also the week to authorise the agent formally if that has not happened.

Week seven: get the cash right

Quarterly updates are not tax payments, a distinction that catches out a surprising number of people. Payments on account still fall due on 31 January and 31 July, and the final declaration for 2026-27 is due on 7 February 2028. Model the cash impact now, while there is still time to move money.

Week eight: build the routine

Put the four quarterly dates in the diary, block a twenty-minute reconciliation into the last Friday of each month, and decide who does what. The businesses coping best with the new regime are not the ones with the fanciest software; they are the ones with a fixed monthly slot and a single bank account.

What to change, not merely fix

The underlying trap is treating Making Tax Digital as an annual event with quarterly admin bolted on. It rewards the opposite habit: small, frequent, boring housekeeping. If the last eight months have been improvised, the fix is not a heroic December — it is a modest routine that survives into the spring.

The bottom line

Most of the errors now surfacing are not technical failures of the software. They are process failures made by busy people who were told the change was coming and hoped it would be gentler than it is. Eight weeks is enough time to make the 7 February deadline uneventful — but only if the first week starts this week.