
This is the part that surprises people most, so it is worth slowing down on. Under Making Tax Digital, HMRC treats each of your businesses separately, and each one gets its own set of quarterly updates. Your self-employment and your property are two different businesses in HMRC's eyes.
A self-employed plumber who also rents out a flat has two businesses. That means four quarterly updates for the plumbing and four for the property, so eight quarterly updates a year, followed by a single Final Declaration that brings everything together.
If you work under the Construction Industry Scheme for several contractors, that is still one trade, not one per contractor. You do not split it into separate businesses. CIS is simply about how tax is taken off at source, so all that work sits inside a single set of quarterly updates.
Only your self-employment and property income go into the quarterly updates. Everything else, such as a PAYE wage, a pension, dividends or savings interest, stays out of the quarterly cycle and is added once a year in the Final Declaration.
Even with several businesses, you only ever pick up one penalty point per quarter for a late update, not one per business. So a missed deadline does not multiply against you.
If you can already feel this getting fiddly, you are not alone. Juggling several streams, several sets of records and eight or more deadlines a year is exactly the sort of thing worth handing
Key differences between the two:
Covers injury or damage to the public.
Covers injury or illness to employees.
Not legally required.
Legally required with staff.
Common for customer-facing businesses.
Required for any business with staff.