Recommending MTD to Mixed-Income Clients: Accountants' Guide

Why Mixed-Income Clients Are the Hardest MTD Referral to Get Right

If you have clients who earn income from both self-employment and property, you already know they fall into a gap. Most MTD software is built for one income type or the other. Free tools often cover sole traders but not landlords. Landlord-focused tools sometimes miss self-employment categories entirely. And the full-fat accounting platforms - Xero, FreeAgent, QuickBooks - are capable but expensive and far more than most of these clients actually need. With the April 2026 mandatory start date now live and the first quarterly update deadline on 7 August, accountants need clear, confident answers about what to recommend. This guide is for you.

Who Qualifies for MTD ITSA From April 2026

The current confirmed threshold is £50,000 gross income from self-employment, property, or a combination of both in a tax year. This is based on gross income, not profit. If a client earned £35,000 from freelance work and £20,000 from rental income in the 2024-25 tax year, their combined qualifying income is £55,000 - they are in scope from 6 April 2026.

The relevant tax year for assessing eligibility is typically the second tax year before the one in which MTD begins to apply. HMRC uses 2023-24 income to determine April 2026 obligations for most clients. You can review the detailed start date logic on GOV.UK's eligibility checker.

If you are unsure whether a specific client is in scope, the post Do I Need to File Making Tax Digital for Income Tax? walks through the eligibility criteria in plain terms - useful to share directly with clients.

The Mixed-Income Problem in Practice

A straightforward sole trader - a freelance designer, a self-employed plumber - has plenty of MTD options. Similarly, a pure landlord with rental income only has dedicated tools available. The problem arises with the in-between client: the graphic designer who also rents out a flat, or the electrician who owns two buy-to-let properties alongside their trade.

This combination is surprisingly common. And it creates a specific software problem that accountants often do not spot until a client has already signed up for something that does not actually work for them.

What goes wrong with single-income-type software

MTD ITSA requires separate reporting for each income source. A sole trader with property income must submit quarterly updates for their self-employment business and separate quarterly updates for their property income. These are distinct reporting streams under the MTD rules - they are not combined into one.

Many sole trader tools simply do not have a property income section. They handle business income and expenses, but there is nowhere to log rent receipts, mortgage interest, letting agent fees, or landlord-specific allowable expenses. If your client fills in what they can and leaves the rest, their filing will be incomplete.

The reverse is also true. Landlord-only tools may have no mechanism to record self-employment income at all, or they treat everything as property income when it is not.

This is not a minor admin issue. Incomplete or mis-categorised submissions can create problems when HMRC cross-references the quarterly updates against the end-of-year final declaration. See Multiple Income Sources and MTD: Self-Employed and Landlord Together for a full breakdown of how the two income streams interact.

Why free tools often fail here

Some free or low-cost MTD tools have been built quickly to meet the April 2026 deadline and cover the most common use case: a sole trader with trading income. Property income support is an afterthought, if it exists at all. Before recommending any free tool to a mixed-income client, check explicitly whether it handles both income streams in the same account, with separate submission pathways.

If it cannot do both, it is not suitable - regardless of the price.

Why Full Accounting Platforms Are Often Overkill

At the other end of the market, platforms like Xero and FreeAgent are technically capable of handling mixed income. But they come with a significant cost - typically £30 to £50 per month or more - and a level of complexity that most sole traders and landlords neither need nor want.

A self-employed electrician who also collects rent from one property does not need double-entry bookkeeping, bank reconciliation dashboards, or payroll features. Recommending a full accounting suite to this client is not a favour. It adds cost, adds confusion, and often results in the client abandoning the software and landing back on your desk three months later having done nothing.

The MTD obligation for these clients is relatively contained: record income and allowable expenses by category, submit quarterly updates, and file a final declaration at year end. That does not require enterprise-level software.

What Bridging Software Actually Does

Bridging software sits between a client's own records - typically a spreadsheet or simple log - and HMRC's MTD system. The client maintains their income and expense records in whatever format they are comfortable with, and the bridging tool handles the technical job of formatting and submitting that data to HMRC in the required structure.

This matters for mixed-income clients because a good bridging tool supports both income types without forcing the client to change how they work. They can keep a simple spreadsheet for rental income and a separate one for their self-employment, then submit both through the same tool.

For a fuller explanation of how bridging software works, see MTD Bridging Software: What It Is and Why It's All Most People Need.

What to look for in a bridging tool for mixed-income clients

• Support for both self-employment income and property income in the same account
• Separate submission pathways for each income type (as HMRC requires)
• Ability to import from spreadsheets or CSV files
• Clear categorisation of allowable expenses for both sole traders and landlords
• HMRC recognition - the software must appear on the HMRC MTD compatible software list
• Reasonable cost - ideally under £15 per month for a basic user

AffordableMTD is built specifically to meet this brief. It handles both self-employment and property income, keeps the two reporting streams separate as HMRC requires, and is priced for clients who need compliance without complexity.

How to Assess a Mixed-Income Client's Software Needs

When a client has more than one income type, work through these questions before making a recommendation.

1. What income types do they have?

Is it self-employment plus property? Self-employment from more than one trade? Property from furnished holiday lets as well as standard residential? Each combination may have slightly different reporting requirements. The post What Income Types MTD Quarterly Updates Accept is a useful reference here.

2. How do they currently keep records?

Some clients use a spreadsheet, some use a shoebox, some use a basic app. A bridging tool works well with clients who are happy to maintain their own records - it just handles the HMRC submission. Clients who want the software to do everything from categorisation to submission may need something slightly more hands-on, but that is still not a reason to push them towards a full accounting platform.

3. Are they comfortable with technology?

The best software for a client is the one they will actually use. A clean, simple interface matters as much as the feature list. If a landlord in their sixties is intimidated by a complex dashboard, they will not file on time.

4. Do they need expense categorisation help?

If a client struggles to categorise expenses correctly, look for a tool with built-in categorisation guidance or CSV import with AI categorisation. AffordableMTD covers this - see also Importing Q1 Expenses: CSV Format and AI Categorisation.

Setting Up a Mixed-Income Client Correctly From the Start

If you are onboarding a mixed-income client to MTD now, the setup stage matters. Mistakes made at setup - for example, logging rental income under the self-employment stream - will cause problems at the quarterly update stage and potentially at year end.

The post Mixed Income and MTD: Landlords with Self-Employment (Q1 Setup Check) covers the specific steps needed to configure an account correctly for this client type. Work through it before your client submits anything.

Pay particular attention to:

• Registering both income sources separately with HMRC through the MTD service
• Confirming the software is connected to both income streams
• Ensuring the client understands they have two separate quarterly update deadlines to meet (even if they fall on the same date)

For a broader checklist covering the April 2026 start, Your MTD ITSA Checklist is worth bookmarking.

The First Quarterly Update Deadline Is 7 August

Q1 covers 6 April to 5 July 2026. The deadline for submitting the first quarterly update is 7 August 2026. That is now fewer than 47 days away at the time of writing. Any client who has not yet sorted their software and started recording income and expenses for Q1 is already behind.

For clients who are still catching up on Q1 records, Fixing Messy Expense Records Before August and Q1 Final Checks Before 7 August are practical starting points. For landlords specifically, First MTD Q1 Filing: What Landlords Must Include explains exactly what needs to go into the submission.

Missing the deadline is not a catastrophe but it does carry potential penalties. The MTD Penalties Explained post covers what happens if a client files late.

A Practical Recommendation Framework for Accountants

When a client comes to you asking what software to use, here is a simple way to frame your recommendation.

1. Single income type, comfortable with spreadsheets: A basic bridging tool is sufficient. AffordableMTD or a comparable recognised bridging tool will cover it.
2. Mixed income (self-employment plus property): You need a bridging tool that explicitly supports both income types with separate submission streams. Most free tools will not cut it. Check before recommending.
3. Multiple trades or complex property portfolios: Consider whether a mid-tier tool or light accounting software is warranted - but only if the complexity genuinely requires it. Many clients with two or three properties still do not need full accounting software.
4. Clients who want their accountant to do everything: Some bridging tools support agent access, which means you can submit on their behalf. Check whether the tool supports this before signing a client up.

For a more detailed comparison of how to match software to income type, see Choosing MTD Software by Income Type and How to Choose MTD Software: A Practical Guide.

Summary

Mixed-income clients - those with both self-employment and property income - are the clients most likely to end up with the wrong MTD software. Single-income-type tools often cannot handle both reporting streams. Full accounting platforms handle both but at a cost and complexity that most of these clients do not need. Bridging software, when it is built to handle both income types correctly, is typically the right answer. It is affordable, it meets HMRC requirements, and it does not require the client to learn a new accounting system. With the first quarterly update deadline on 7 August, there is not much time left to get this right. Check what your clients are using now, and if their current tool cannot handle their income mix, move them before they miss their first filing.