The change for an accountant is how often a self-employed client’s figures arrive. Under Self Assessment, the picture arrived once a year, months in arrears. Profit running ahead of drawings, a new mortgage on a let property, or income climbing towards a threshold was seen in January, about something that happened the previous spring. Under Making Tax Digital the same figures arrive four times a year, within weeks of the quarter end.
The figures
HMRC published two numbers. More than 436,000 customers have sent a first quarterly update, and more than 570,000 have signed up to the service. On HMRC’s own figures, around 134,000 people signed up and did not file.
Making Tax Digital for Income Tax has been mandatory since April 2026 for sole traders and landlords with qualifying income over £50,000. The first update period ran from 6 April to 5 July 2026, with a calendar-quarter alternative running 1 April to 30 June, and the filing deadline for all customers was 7 August 2026. From April 2027 the threshold drops to qualifying income over £30,000. Self Assessment continues: the return deadline remains 31 January, and HMRC says quarterly updates do not replace it, though those in scope must send their updates in order to submit a return.
What a quarterly update contains
A quarterly update is a short summary of income and expenses sent through recognised software. HMRC says it takes minutes to complete and carries no adjustments, no reliefs and no final position. It does not replace the year-end conversation.
It changes when the accountant sees the figures. This example uses a made-up client. A landlord with two let properties and consultancy income adding up to £68,000 of qualifying income refinances in May 2026 and buys a third property. Under the old cycle, the practice first sees that transaction in the 2026/27 return, prepared between the following autumn and 31 January 2028, twenty months after the event. Under the new one, the extra rental stream and the changed interest cost appear in a submission due on 7 August 2026, about ten weeks after completion. The accountant can ask whether anything protects the income servicing the new mortgage while the client is still considering it.
HMRC, 12 August 2026: more than 436,000 sole traders and landlords have sent a first quarterly update, and more than 570,000 have signed up to the service.
Five things a quarterly update shows sooner
The accountant now sees them in the quarter they occur. The fuller list is in what to look for in the accounts.
- Profit running ahead of drawings. Three consecutive quarters of surplus building with nothing extracting it is visible by Christmas. The same position inside a company is set out in the cash question.
- A new borrowing commitment. A refinance or an additional property changes the interest line at once. Whether anything protects the income servicing it is a question to ask soon after the borrowing starts.
- Income crossing a threshold mid-year. Movement towards the £100,000 personal allowance taper (GOV.UK, Income Tax rates and Personal Allowances), or towards the point where incorporation starts to make sense, becomes a decision taken in advance.
- A step change in trading. A quarter well ahead of the same quarter last year is the point to raise pension capacity. The annual allowance is £60,000 (GOV.UK, Tax on your private pension contributions).
- A quarter that stops. Income falling away is seen within the quarter, where an annual cycle showed it a year later.