If you’re a self-employed landlord, it’s easy to assume the Construction Industry Scheme (CIS) is “for builders, not for me”. In practice, CIS can catch landlords out when you’re doing significant building work on a property — especially refurbishments, extensions, conversions, or ongoing maintenance using contractors.
This guide explains when CIS applies to landlords, what your responsibilities look like day-to-day, and how good CIS support can keep you compliant (and reduce stress). We’ll also touch on how this links to Making Tax Digital (MTD) for Income Tax, because the record-keeping expectations are only going one way.
## What CIS is (in plain English)
CIS is HMRC’s way of collecting tax from people who do construction work.
If you pay someone to carry out construction work, you may have to:
– register as a **CIS contractor** (even if you’re “just a landlord”),
– **verify** your subcontractors with HMRC,
– **deduct tax** from their labour charges (usually 20% or 30%),
– **file monthly CIS returns**, and
– give subcontractors **payment and deduction statements**.
It’s a compliance process. HMRC expects it to be done on time and done properly.
## The key question: can a landlord be a CIS contractor?
Yes. A landlord can be treated as a contractor under CIS if they are running a **property business** and the construction spend is high enough.
Broadly, CIS can apply if:
– you carry out construction work on properties you rent out (or plan to rent out), and
– your construction spend is significant over a period (HMRC looks at this across the business, not just one property).
Where landlords get caught is when a “one-off refurb” becomes a pattern of projects — or when costs rise and cross the threshold without anyone noticing.
If you’re unsure whether you should be registered, it’s worth checking early. Sorting it out after HMRC query it is almost always more painful.
## What counts as “construction work” for CIS?
CIS covers a wide range of work, including:
– extensions, conversions, and structural alterations
– major refurbishments
– installation of kitchens and bathrooms (often CIS, depending on the contract)
– repairs and maintenance (many types)
– decorating (often included when part of a wider construction contract)
– groundwork, drainage, roofing, plastering, tiling, and similar trades
It can also include labour-only work.
Some things are usually **outside** CIS (depending on the facts), such as purely professional services (for example, architects) and some types of manufacturing/supply-only contracts. The detail matters — and HMRC won’t accept “I didn’t realise” as a defence.
## Why CIS matters for landlords in practice
Here’s what tends to go wrong:
### 1) Paying contractors gross when you should be making deductions
If CIS applies and you pay a subcontractor without verifying them and applying the right deduction, HMRC can pursue **you** for the tax that should have been withheld.
### 2) Missing monthly CIS returns
CIS returns are monthly, even if you only had one contractor on one job.
Late filing penalties can build up quickly, and they don’t always feel proportionate to the size of the project.
### 3) Mixing up materials and labour
CIS deductions are generally taken from the **labour element**, not the materials element (and not VAT). If invoices aren’t clear, it’s easy to deduct the wrong amount.
### 4) Treating everyone as “a subcontractor”
Some workers should be on **PAYE** instead, depending on the working arrangement. Getting this wrong can create payroll problems as well as CIS issues.
## What good CIS support looks like (and what we actually do)
When we provide CIS support to self-employed landlords, it’s usually a mix of set-up, monthly compliance, and keeping your records clean.
Typical support includes:
– checking whether you need to register as a CIS contractor
– registering you and setting up the process properly
– verifying subcontractors with HMRC
– calculating the correct deductions (including separating labour/materials correctly)
– preparing and submitting monthly CIS returns
– producing payment and deduction statements for subcontractors
– helping you keep a clear audit trail (in case HMRC ask questions)
– tying CIS activity back to your year-end accounts and Self Assessment
The aim is simple: keep you compliant, avoid penalties, and make sure your property figures are correct.
## How CIS links to Self Assessment for landlords
CIS is not a separate tax return — but it affects your wider tax position.
For landlords who also do self-employed work (or have a property business with construction activity), CIS compliance sits alongside:
– your rental income and allowable costs
– capital vs revenue treatment (for example, refurb vs improvement)
– your Self Assessment tax return
If you’ve had a big property project, it’s also a good time to check whether costs have been claimed correctly. Misclassifying spend can cause problems later.
## CIS and Making Tax Digital (MTD): why you should get organised now
From April 2026, MTD for Income Tax (ITSA) begins rolling out, bringing digital record keeping and quarterly updates for many self-employed people and landlords.
If you want a clear view of the rollout dates and what preparation actually involves, this guide is a helpful starting point: **[MTD for Small Businesses (2026–2028): Costs, Benefits and a Clear Preparation Timeline](https://www.taxdigital.co.uk/mtd-for-small-businesses-2026-2028-costs-benefits-and-a-clear-preparation-timeline/)**.
CIS isn’t the same as MTD, but they share a theme: HMRC expects better, more timely records. If your invoices are scattered across emails and WhatsApp messages, it becomes hard to:
– prove what was labour vs materials,
– show who you paid and when,
– reconcile payments to your bank,
– and prepare accurate quarterly updates when MTD applies.
### Choosing software that won’t make this harder
If you’re moving towards digital record keeping, choosing the right software matters. Some tools make it far easier to track contractor payments, store invoices, and keep a clean trail.
This comparison guide is useful if you’re weighing up your options: **[Best MTD-Compatible Software for UK Businesses (2026 Guide): What to Use for MTD for Income Tax](https://www.taxdigital.co.uk/best-mtd-compatible-software-for-uk-businesses-2026-guide-what-to-use-for-mtd-for-income-tax/)**.
And if FreeAgent is on your radar (particularly common for smaller businesses), you may find this overview helpful: **[FreeAgent](https://www.taxdigital.co.uk/software/freeagent/)**.
## Common questions we hear from self-employed landlords
### “I only did up one property — surely CIS can’t apply?”
It might not. But the deciding factor is rarely the story (“one project”) and more the facts: what work was done, who was paid, and whether your property business meets HMRC’s tests.
### “My builder is a limited company. Do I still need CIS?”
Often yes — CIS can apply to payments to companies as well as individuals. Verification and correct treatment still matter.
### “Can I just sort it out at year end?”
CIS is monthly. Waiting until year end is exactly how penalties and messy records happen.
## A sensible next step
If you’re a landlord paying for building work (or about to start a project), it’s worth getting clarity on CIS before the first payment goes out.
A quick review can confirm:
– whether CIS applies to your property business,
– whether you need to register,
– and what your monthly process should be.
If you want support, Tax Digital can help you set it up properly, keep the monthly returns on track, and make sure your records are in good shape for Self Assessment — and for MTD as it approaches.
Related: If Everything Is Digital Under MTD, Do I Still Need an Accountant? (MTD ITSA 2026–2028)
Related: Can I File Nil Quarterly Updates Under MTD ITSA and Just Do the Tax Return at Year End?
Related: Integrating ERP and CRM with MTD-Enabled Accounting Systems (MTD ITSA 2026 Guide)
Related: {Topic_Name}: A Plain-English UK Guide (Including MTD for Income Tax 2026–2028)