A bookkeeper keeps a spreadsheet. At the end of each quarter she totals the columns, opens HMRC's website, and types nine figures into nine boxes. She has done it for twenty years and has never made a mistake worth mentioning.
That process is the thing Making Tax Digital was designed to end. Not the spreadsheet. The retyping.
The rule is about the chain, not the software
Making Tax Digital requires two things. Records must be kept digitally, and the data must reach HMRC through compatible software, with no manual transfer anywhere along the way.
The second part is the one that catches people. Between the point where a transaction is first recorded digitally and the point where the return is submitted, every step must be a digital link. A digital link is any transfer of data between programs that does not involve a human retyping or copying it: a formula linking cells, an import of a CSV file, an API call, emailing a spreadsheet as an attachment so it can be imported at the other end.
What is not a digital link is copying a number from one place and pasting or typing it into another. Cut and paste was specifically allowed during a soft landing period, and that period ended.
This is why bridging software exists. A spreadsheet is a legitimate digital record. Bridging software reads it and files the return, so the spreadsheet survives and the retyping does not. HMRC publishes a list of software that has been recognised as compatible, and it includes free and low-cost options as well as the well-known accounting packages.
VAT came first and is now universal
MTD for VAT started with businesses above the VAT registration threshold in April 2019. It was extended to all VAT-registered businesses, regardless of turnover, from April 2022. If you are VAT registered, you are in it, including voluntary registrations below the threshold.
What you must keep digitally is defined: the business name and address, the VAT registration number, any schemes used, and for each supply the time of supply, the value and the rate of VAT charged. You do not have to scan every invoice, although if you are using software that does it, the work of finding things later becomes much easier.
Penalties for VAT moved to a points-based system for periods starting on or after 1 January 2023. A late return earns a point rather than an immediate fine, and a fixed penalty applies once you reach the threshold for your filing frequency. Late payment penalties work separately and increase the longer the money is outstanding, with interest running alongside. The design is deliberately kinder to the occasional slip and harder on persistent lateness.
Income tax is the bigger change
MTD for Income Tax Self Assessment is the part that affects sole traders and landlords who have never had anything to do with VAT.
The phasing is by qualifying income, which means gross income from self-employment and property before expenses, added together. The first group, those with qualifying income above £50,000, came into scope from April 2026. Those above £30,000 follow from April 2027, and the government has announced an extension to those above £20,000 from April 2028. Dates and thresholds in this programme have moved more than once, so check where you sit rather than assuming.
The obligations are different from VAT. Instead of one annual return you file quarterly updates of income and expenses for each business and property source, followed by a final declaration after the end of the tax year that brings in everything else and replaces the old Self Assessment return.
Two points that cause confusion. Quarterly updates are not quarterly tax bills: payment dates are unchanged, still 31 January and 31 July. And the quarterly figures are cumulative summaries rather than a finalised set of accounts, so accounting adjustments happen at the year end as they always did.
What it actually costs a small business
For a business already using accounting software connected to its bank, the change is close to nothing. For a business running on a carrier bag of receipts and an annual visit to the accountant, it is real work, and the work moves from January to every quarter.
Realistically you need three things:
- Compatible software, or a spreadsheet plus bridging software. Check HMRC's published list rather than a supplier's claim.
- A bank feed, so transactions arrive in the records without being typed. This is where most of the time saving comes from.
- A habit. Fifteen minutes a week beats four days in January, and the quarterly deadlines remove the option of leaving it.
Some people are exempt. Digital exclusion, on grounds of age, disability, location or religious belief, can be claimed, and HMRC decides each case. There are also exclusions for certain taxpayers with more complicated affairs where the systems are not ready. Exemption has to be applied for, not assumed.
The reason behind it, whether you agree or not
HMRC's stated purpose is reducing the tax gap attributable to error, and the department has published estimates attributing a substantial part of that gap to mistakes and failure to take reasonable care by small businesses. Whether quarterly filing addresses that is a fair argument to have, and plenty of professional bodies have had it publicly.
The practical position is unchanged by the argument. The direction has been consistent across several governments, the VAT half is done, and the income tax half is now running. Businesses that moved early tended to find the software useful for its own sake, because knowing your position in October is worth something regardless of what HMRC requires.
If you are close to a threshold, work out your qualifying income now. It is gross, it combines trading and property income, and it is tested against the figures on a previous tax return, so the year that determines your start date may already have happened.
Where this shows up in the game
In Business Baron, bookkeeping is a cost and a source of error rather than a chore you click through. Records kept badly produce a worse picture of your own business, which is the real penalty, and the compliance regime tightens as the game moves through the decades towards 2040. The free game has all of it too, paperwork included.