MTD ITSA and Inside-IR35 Contractors – Do You Need to Worry?

As the rollout of Making Tax Digital for Income Tax Self Assessment (MTD ITSA) draws closer, contractors operating under IR35 rules are increasingly asking whether the new requirements will apply to them. For many, IR35 already feels complex enough. Now, with the added pressure of digital tax compliance, the question arises: does MTD ITSA affect those working inside IR35? What if you also have self-employment or rental income on the side? What if you switch between contract types throughout the year?

This article aims to offer clarity on the relationship between MTD ITSA and inside-IR35 contractors. It explains how HMRC defines qualifying income, whether MTD ITSA obligations apply to you, and how Merranti Accounting can help you stay on the right side of the rules — without unnecessary admin, cost, or confusion.

Understanding the IR35 Context

IR35 legislation is designed to prevent “disguised employment,” where contractors work through limited companies while effectively operating as employees. If you fall inside IR35, your income is treated as employment income for tax purposes, even if you operate through a personal service company (PSC).

In most cases, contractors working inside IR35 either:

• Are paid through an umbrella company and taxed under PAYE, or
• Receive deemed salary payments via their PSC, also taxed as PAYE income

Either way, HMRC classifies this as employment income, and that classification has important implications for MTD ITSA.

What Income is Counted Under MTD ITSA?

MTD ITSA only applies to individuals who receive qualifying income over a certain threshold. As of April 2026, that threshold is set at £50,000 of qualifying income, which will later drop to £30,000 in 2027 and is expected to reduce further to £20,000 by 2028.

However, HMRC is very specific about what counts as qualifying income. The following types of income do count toward MTD ITSA thresholds:

• Self-employment income (sole traders)
• Property income (from UK or overseas property lettings)

Other income types do not count toward the MTD threshold, including:

• Employment income (whether from a traditional job, umbrella company, or deemed employment via PSC)
• Dividends (including those drawn from a PSC)
• Pension income
• Bank interest and investment income
• Capital gains

This distinction is crucial. If all your income comes from working inside IR35 — either through a PSC paying deemed salary or via an umbrella company — then you are not required to join MTD ITSA, even if your gross income is over £50,000.

Common Scenarios Explained

Let’s look at a few real-world examples to clarify who is affected and who is not.

Scenario 1: Contractor Paid via Umbrella Company

You earn £80,000 per year working as a contractor via an umbrella company. Your income is taxed at source through PAYE.

In this case, you are not subject to MTD ITSA, because this income is classed as employment income. It does not contribute to the MTD threshold.

Scenario 2: Contractor with Mixed Income

You work part of the year through an umbrella company (£45,000 income) and also earn £30,000 through freelance work paid directly to you as a sole trader. Additionally, you rent out a flat generating £12,000 in rental income per year.

Here, your total qualifying income is £30,000 (sole trader) + £12,000 (property) = £42,000. You are not yet caught by MTD ITSA under the £50,000 threshold but will be if your qualifying income grows — or when the threshold is lowered to £30,000 in 2027.

Scenario 3: Director of PSC Working Inside IR35

You operate through a personal service company (PSC), but your client has determined that your contract is inside IR35. You take a small salary from the PSC (taxed via PAYE) and the rest as dividends.

This income structure is not classed as self-employment. It’s either employment income (the salary) or investment income (dividends), and neither count toward the MTD ITSA threshold.

You would not need to comply with MTD ITSA unless you had additional income from direct sole trader work or property lettings.

The Importance of Monitoring Mixed Income Streams

The key issue for contractors is whether they earn income outside IR35 in addition to their inside-IR35 engagements.

More and more contractors now supplement their umbrella income with:

• Ad hoc freelance work
• Rental income
• Consultancy arrangements via sole trader registration

This is where the MTD obligations begin to emerge. The qualifying threshold of £50,000 applies to the combined gross total of self-employment and property income. So, while your umbrella or IR35-related income may not count, your side hustle might — and it could push you over the limit without you realising.

At Merranti Accounting, we regularly see clients who are on the border of these thresholds. Often, a small boost in rental income or an extra freelance contract can trigger MTD requirements. That’s why we recommend reviewing your income structure early and planning ahead.

Does MTD Apply if You Exit IR35?

If your current contract is inside IR35 but you switch to a fully outside-IR35 role in the future, and begin trading again as a sole trader or a limited company with genuine self-employed income, your qualifying income could rapidly rise above the MTD threshold.

For example, if your outside-IR35 work generates £60,000 in self-employment income in 2024/25, you will be required to comply with MTD ITSA starting April 2026, even if you later return to IR35 contracts or reduce your income. This is because HMRC assesses your qualifying income based on the figures two years prior to the start of MTD obligations.

In short, it’s not just where you are now — it’s where you’ve been.

Merranti’s Role: Helping Contractors Prepare with Clarity

Whether you are a contractor operating inside IR35, moving between contract types, or unsure how your income is classified, Merranti Accounting offers tailored advice and compliance support. Our goal is to make sure you:

• Understand whether MTD ITSA applies to you
• Monitor all income sources accurately
• Avoid unnecessary work or penalties
• Are prepared if your circumstances change

We also work closely with contractors who use multiple income structures, providing practical advice on:

• Tax efficiency across IR35 and non-IR35 contracts
• Digital record-keeping for self-employment or rental income
• Setting up simple MTD-compliant software
• Submitting quarterly updates and year-end declarations
• Managing hybrid structures involving limited companies, sole trader work, and property ownership

If you’re unsure whether your situation requires MTD compliance, we’ll carry out a free eligibility check, assess your income mix, and guide you through your next steps.

Summary: MTD ITSA and IR35 in Perspective

• Contractors whose income is fully inside IR35 are not subject to MTD ITSA
• Income taxed under PAYE — including umbrella companies and deemed salary via PSC — does not count toward the MTD threshold
• MTD ITSA applies only to self-employment and property income
• If you have side income from freelancing or rental properties, and it exceeds £50,000 combined, you will need to comply
• Your status is based on your gross qualifying income two years earlier
• Changing contract types can affect your future MTD status — so plan now

Need Expert Advice?

At Merranti Accounting, we help contractors simplify tax and stay compliant without unnecessary stress. If you’re confused by IR35, income thresholds, or whether MTD ITSA applies to you, speak with our team today.

Find More About MTD ITSA Here