Rental income and self-employment: why MTD gets complicated with both

The search that goes nowhere

If your qualifying income from property and self-employment combined puts you over the threshold, you're in scope for MTD. That much you probably know. What you might not know is that you must do MTD for both income sources, not whichever one is bigger.

So you start looking for an app. And here's where it falls apart.

Most MTD tools are built for one type of income. Accounting apps like QuickBooks and Xero handle self-employment well, but property is an afterthought. Property-specific tools handle rental income but don't touch self-employment. A handful attempt both, but they all feel like a compromise: the property side is clunky, or the self-employment features are bolted on, or you end up paying for two subscriptions.

Several banks have started offering free MTD tools built into their apps. Monzo, HSBC, Tide. These sound appealing until you realise they're stripped-down sole trader tools. Fine for a freelancer tracking invoices. Terrible for a landlord dealing with mortgage interest, joint ownership, or letting agent statements.

So you're stuck. Nothing handles both properly. And the deadline isn't moving.

Why property income is harder than it looks

Self-employment income is relatively straightforward: invoices in, expenses out. Property income has layers that generic tools aren't built for.

Take mortgage payments. Every month, you need to split interest from capital repayment. The interest qualifies for tax relief under Section 24. The capital repayment doesn't appear on your tax return at all. In a self-employment app, recording this correctly means posting journals, splitting entries between the profit and loss account and the balance sheet, and getting the numbers right every single month. Get it wrong, and your quarterly update is wrong.

Or take the question of capital versus revenue expenses. You replace a broken boiler with a like-for-like model: that's a repair, and it's an allowable expense. You replace it with an upgraded system: that's a capital improvement, and it's treated completely differently. Self-employment apps don't prompt you. They expect you to know the difference and classify it yourself.

These aren't edge cases. If you have a mortgage, you deal with the interest split monthly. If you ever repair or improve a property, you hit the capital versus revenue question. And if you get either wrong, your quarterly updates are wrong.

HMRC has already solved this (but nobody tells you)

Here's the part most people miss.

HMRC's own guidance says you can use more than one app for Making Tax Digital. Their published guidance on choosing MTD-compatible tools specifically says you can use one product that does everything, or more than one product that work together.

This isn't a workaround. It's how HMRC designed MTD to work. Each app handles one income source, sends its own quarterly updates, and everything comes together at year end in one final declaration.

For landlords with self-employment income, this means using a dedicated self-employment app for your trading income and a dedicated property app for your rental income. Each does what it's built for. No compromises on either side.

But making this work in practice raises questions. How do the apps communicate? What happens at year end? Do the quarterly updates conflict? What does the setup actually look like?

The full answer is in the guide

We've written a complete guide to handling MTD when you have both rental income and self-employment. It covers everything this post doesn't have room for:

• How qualifying income works when you have multiple income sources (and the calculation that catches people out)

• Three real scenarios showing how mixed income affects mandation dates

• What actually goes wrong when you use a self-employment app for property, with specific examples

• How two apps work together during the year and at year end

• How to choose a self-employment app and set up Provestor for the property side

• Why Provestor handles property income differently from generic accounting tools

If you've been putting off the mixed income question because none of the answers you've found made sense, this guide is the one that will.

Read the full guide: Rental income and self-employment — how to handle MTD when you have both →