CIS scheme explained in plain English helps contractors and subcontractors understand how the Construction Industry Scheme works. If you work in construction, pay subcontractors, or get paid by contractors, CIS affects registration, verification, tax deductions, monthly returns, payment statements and how tax is later credited against your bill. Understanding the scheme helps you avoid HMRC problems, protect cash flow and keep construction tax records under control.

About this episode

Explaining the CIS scheme looks at one of the key tax compliance areas for construction businesses.

We explain what the Construction Industry Scheme covers, what contractors and subcontractors are, when registration matters, how deductions work, why verification is important, and how CIS reporting affects sole traders and limited companies.

For the wider self-employed tax picture, our episode on Tax basics for self employed: What You Need to Know is a useful next step.

Why the CIS scheme matters

The construction sector is large, busy and full of contractor-subcontractor relationships. That is one reason CIS exists.

The scheme was introduced to reduce tax evasion in the construction industry. Under CIS, contractors deduct tax from certain subcontractor payments and pass those deductions to HMRC.

Those deductions are not an extra tax in themselves. They are advance payments towards the subcontractor’s tax and National Insurance. However, mistakes with registration, deductions or returns can still lead to penalties, repayment problems and cash flow pressure.

Key points from this episode

What is the CIS scheme?

The Construction Industry Scheme, usually shortened to CIS, is a UK tax scheme for construction work.

It tells contractors how to deal with payments made to subcontractors. In many cases, the contractor must deduct tax before paying the subcontractor and then pass that deduction to HMRC.

That means both sides need to understand their role. The contractor must deduct and report correctly. The subcontractor must register, keep records and claim credit for deductions through the right tax route.

Who is a contractor under CIS?

A contractor is a person or business that pays subcontractors for construction work.

You may also count as a contractor even where construction is not your main trade, if your business spends enough on construction work over the relevant period.

The key point is practical. Once you pay subcontractors for construction work, you may have CIS responsibilities. That means registration, verification, deductions, payment statements and monthly returns.

Who is a subcontractor under CIS?

A subcontractor is a person or business that carries out construction work for a contractor.

That can include individual tradespeople, sole traders, partnerships and limited companies. The episode gives practical examples such as plasterers, electricians and ground workers.

A business can also be both contractor and subcontractor. For example, you may be paid by a main contractor on one job and pay your own subcontractors on another. In that situation, you need to understand both sides of the scheme.

What construction work is covered by CIS?

CIS covers most construction work to permanent or temporary buildings and structures, as well as civil engineering work such as roads and bridges.

Construction work can include site preparation, foundations, access works, demolition, dismantling, building work, alterations, repairs, decorating, and installing systems for heating, lighting, power, water and ventilation.

Cleaning the inside of buildings after construction work can also fall within the scheme.

What work is outside CIS?

Not everything connected with construction falls under CIS.

The episode highlights several exclusions, including architecture, surveying, scaffolding hire with no labour, carpet fitting, making construction materials, delivering materials, and work on construction sites that is clearly not construction work, such as running a canteen or site facilities.

This matters because the wrong classification can lead to incorrect deductions or missing deductions. Where the work sits near the boundary, check the current HMRC guidance before deciding.

CIS registration for contractors and subcontractors

Contractors must register for CIS before they start paying subcontractors under the scheme.

Subcontractors should also register. A registered subcontractor usually suffers deductions at the standard rate. An unregistered subcontractor normally suffers deductions at the higher rate.

Registering correctly helps avoid unnecessary deductions, confusion and future tax-record problems.

Verification before paying subcontractors

Before paying a new subcontractor, a contractor must verify them with HMRC.

Verification tells the contractor whether to pay the subcontractor gross, deduct at the standard rate, or deduct at the higher rate.

This is not a discretionary choice. The contractor must follow the payment status given through the HMRC verification process.

CIS deduction rates

The main CIS deduction rates are:

• 20% for registered subcontractors paid under deduction;
• 30% for unregistered subcontractors or where HMRC tells the contractor to use the higher rate;
• 0% where the subcontractor has gross payment status.

The deduction is an advance payment towards the subcontractor’s tax and National Insurance. It is not the same as PAYE employment, and it does not automatically mean the subcontractor has no further tax to deal with.

What CIS deductions are applied to

One common mistake is assuming CIS only applies to a narrow labour amount and ignoring related payments.

The episode explains that travel, subsistence and accommodation charged under the construction contract can form part of the overall contract value for CIS purposes.

However, current HMRC rules also require care. Contractors normally start with the subcontractor’s gross invoice and then remove items such as VAT and qualifying direct materials before applying the CIS percentage to the remaining amount. Therefore, the correct answer is not “labour only” and not always “the full invoice” either. The calculation must follow the CIS deduction rules.

Materials, travel and accommodation

Materials need careful treatment under CIS.

Where the subcontractor has paid directly for qualifying materials used for the job, those material costs may be excluded from the amount on which CIS is calculated. Evidence matters.

Travel, subsistence and accommodation are different. Where those costs form part of what the subcontractor invoices under the construction contract, they can fall into the CIS calculation. This is one area where mistakes are common, so contractors and subcontractors need proper records.

Gross payment status

Gross payment status means the subcontractor can be paid in full, without CIS deductions being taken at source.

This can help cash flow, but it comes with conditions. HMRC looks at compliance history, business activity, bank account arrangements and turnover tests before granting gross payment status.

Gross payment status does not remove the tax bill. It changes when the tax is paid. The subcontractor still declares income and pays tax through Self Assessment or Corporation Tax, depending on the business structure.

Monthly CIS returns

Contractors normally need to report CIS payments to HMRC each month.

The monthly return shows payments made to subcontractors, whether they were paid gross or under deduction, and the deduction rate used.

Missing returns can lead to penalties. Even nil periods need attention unless HMRC has been told the scheme is inactive for a period.

Payment and deduction statements

Where a contractor makes CIS deductions, the subcontractor needs a payment and deduction statement.

This statement helps the subcontractor prove what was deducted and later claim credit for those amounts.

Poor records can create problems when preparing a Self Assessment tax return, company records or a CIS repayment claim.

How subcontractors recover CIS deductions

CIS deductions are credited against the subcontractor’s tax position.

A sole trader or partner normally claims credit through Self Assessment. A limited company subcontractor may be able to offset CIS deductions against PAYE, National Insurance and other liabilities during the year, with any remaining claim dealt with through the appropriate company process.

This is why monthly CIS statements and clean bookkeeping matter. Without evidence, the deduction may be harder to match, reclaim or offset correctly.

CIS and VAT reverse charge overlap

CIS can also overlap with VAT reverse charge rules in construction.

They are separate rules, but they often affect the same construction businesses. CIS deals with deductions from subcontractor payments. VAT reverse charge deals with who accounts for VAT in certain construction transactions.

Our episode on VAT Reverse Charging in the UK: When It Applies and How to Record It is a useful supporting step where VAT also applies.

CIS checklist for contractors and subcontractors

• Are you a contractor, subcontractor, or both?
• Have you registered in the correct CIS capacity?
• Have you checked whether the work is covered by CIS?
• Have you identified any exclusions before invoicing or deducting?
• Has the contractor verified the subcontractor with HMRC?
• Is the correct deduction rate being used?
• Has VAT been excluded before calculating CIS where relevant?
• Are direct material costs supported by evidence?
• Are travel, accommodation and subsistence being treated correctly?
• Are monthly returns, payment statements and records up to date?

FAQs about the CIS scheme

What is the CIS scheme?

The Construction Industry Scheme is a UK tax scheme where contractors deduct money from certain subcontractor payments and pass it to HMRC as an advance payment towards the subcontractor’s tax and National Insurance.

Who needs to register for CIS?

Contractors must register where they pay subcontractors for construction work. Subcontractors should register to avoid the higher deduction rate. A business can be both contractor and subcontractor.

What are the CIS deduction rates?

The usual rates are 20% for registered subcontractors, 30% for unregistered subcontractors, and 0% where the subcontractor has gross payment status.

Does CIS apply to materials?

CIS calculations need care. Contractors usually start with the gross invoice, remove VAT and qualifying direct material costs, then apply the CIS rate to the remaining amount. Evidence for materials matters.

Episode Timecodes

• 00:00 – Construction sector size and why CIS exists
• 00:23 – What the episode covers
• 01:09 – Financial awareness and tax compliance context
• 01:32 – What counts as a contractor
• 02:04 – What counts as a subcontractor
• 02:21 – Registering as contractor, subcontractor, or both
• 03:20 – Construction work covered by CIS
• 03:45 – Repairs, decorating and installation work
• 04:02 – CIS exclusions and non-construction site work
• 04:41 – CIS deductions and tax collector role
• 05:26 – 20%, 30% and gross payment status
• 05:55 – Invoices, VAT and common deduction mistakes
• 06:44 – Travel, subsistence and accommodation
• 07:04 – Gross payment status explained
• 08:23 – Offsetting CIS suffered and CIS deducted
• 08:49 – Limited company treatment
• 09:14 – Sole trader treatment through Self Assessment
• 09:34 – Final recap: rates, verification and monthly returns

Related episodes

• Tax basics for self employed: What You Need to Know
• Tax Treatment for Sole Traders Explained
• VAT Reverse Charging in the UK: When It Applies and How to Record It

Key takeaway

The CIS scheme is a practical tax system for construction work. Contractors need to register, verify subcontractors, apply the correct deduction rate, file monthly returns and give deduction statements. Subcontractors need to register, keep records and make sure deductions are credited properly.

The biggest mistake is treating CIS casually. The scheme affects cash flow, tax records, invoices, monthly reporting and HMRC compliance. Good bookkeeping and clear CIS processes make the whole system easier to manage.

Plan it, Do it, Profit.

“CIS is not just construction paperwork. It affects how subcontractors are paid, how tax is deducted and how records are reported to HMRC.”

Further Support

The I Hate Numbers podcast helps business owners understand tax, CIS, VAT, Self Assessment, payroll, bookkeeping, accounting and business finance in a practical way. We simplify financial topics so you can make better decisions and feel more confident with your numbers.

If you need support with CIS registration, subcontractor verification, CIS deductions, monthly returns, bookkeeping or construction tax records, you can contact us for an initial chat.

You can also watch more practical finance and tax support on the I Hate Numbers YouTube channel, or listen and follow on Apple Podcasts.

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The construction sector is one of the largest sectors in the United Kingdom. There are over 3.7 million people that work in that sector, and that's approximately 9% of the UK workforce. That's some numbers indeed. Backing that up, the CIS scheme or construction industry scheme was introduced in 1971, primarily to combat tax evasion within the sector itself.

In this podcast, I'm going to be covering what the CIS scheme is, what are contractors and what are subcontractors, what the requirements are in terms of reporting, in terms of registration, and more importantly, how tax should be correctly dealt with under the CIS scheme itself.

You are listening to the I Hate Numbers Podcast with Mahmood Reza. The I Hate Numbers podcast mission is to help your business survive and thrive by you better understanding and connecting with your numbers. Number love and care is what it's about. Tune in every week. Now, here's your host, Mahmood Reza.

Hi folks. Welcome to another weekly episode of I Hate Numbers, the podcast that's there to improve your financial awareness, improve your money mindset, help your business make more profit, save tax, and save time. What a fantastic combination of things we have there. Let's crack on with the podcast. Now, firstly, let's establish what a contractor is and what a subcontractor is.

Typically, a contractor is an individual or a business, a company that provides services to a client for money under a contract for services. In terms of the regulation requirements here for registration, you must register and notice the word must as a contractor if you either pay subbies or subcontractors for construction work, or your business itself does not do construction work, but you spent more than 3 million pounds on construction in the last 12 months since you made your first payment. Now a subcontractor, or a subbie to give it its working title,

is somebody who takes on work and supports the contractor in either building that house, building that bridge, building that hospital, take on that construction project, and they take on work that a contractor cannot do because they don't have adequate resources or perhaps the skill sets to perform that task.

Now, if you are a subcontractor, you must register with HMRC if you carry out construction work for a contractor. Now, it's possible, by the way, to be both a contractor and a subcontractor. If that applies to you, then you must register in both capacities. Now, subbies range from the individual, one-person operation,

to very large multinational companies, and they carry out work for a building contractor. Imagine somebody who's got a contract to build a hospital, to build a bridge, a highway, it's going to be next to impossible for them to perform all those tasks, so subcontractors will be an important part of that supply chain.

Now it could be, you could be a subbie who's a plasterer, an electrician, a ground worker. Any of those tasks are going to be fitting the bill. Now, having decided what a contractor and a subcontractor is, and the fact is you must register, please folks, check out the show notes for some links as to how you can do that.

Let's have a look at the type of work that's covered by the CIS scheme. Now, CIS covers most construction work to a permanent or temporary building or structure, civil engineering work like roads and bridges, and for the purposes of this CIS scheme, construction work includes site preparation, so for example, laying the foundations, providing the access works, any demolition or dismantling the actual building work itself,

alterations, repairs and decorating, installing systems for heating, lighting, power, water, and ventilation, or cleaning the inside of the buildings once the construction work has been completed. Now, there are exceptions. You may work within the construction industry, but it doesn't necessarily mean that you have to register

as a subcontractor or a contractor. So, if your job of work involves architecture or surveying, you don't have to register. It doesn't apply to you. If you hire out scaffolding, but there's no labor provided, then you are also accepted. Other things including carpet fitting, making the materials that are used in the construction, delivering the materials,

and working on construction sites is clearly not a construction activity. Very important, nevertheless. So if you provide canteen facilities or site facilities like toilets, then that is not covered by the CIS scheme. So, wipe your brow and any invoices that you present to your client can be paid in full

without any deductions. Now, I've mentioned the idea of deductions, and it's really critical that we do them correctly. A subcontractor and a contractor is seen as an unpaid tax collector. The assumption is that ignorance is no excuse, and all the detailed rules and regulations that are covered by the CIS regulations are assumed to be known by the subbie or the contractor or their agents.

Unfortunately, over the years, I have seen mistakes being made here, and it's quite understandable because it's quite a complex area. But, however, having said that, there are some common mistakes that we can certainly avoid. Now, under the CIS scheme, contractors take off money from their subcontractors' payments and they pass that on to HMRC.

HMRC, by the way, folks, is Her Majesty's Revenue and Customs tax office for one of a better term. Now, that tax collection responsibility, those deductions are either made at the rate of 20% or 30%. Now, 30% typically is if you are not registered as a subbie. If there are any issues with your tax records or compliance, then that rate will be dictated to, and a contractor must get verification as to whether to apply from HMRC.

Now, you could also be what's called a gross certificate holder, more of that later on in this podcast. Now, subbies will typically invoice for their time, materials, travel, subsistence, accommodation, and if the subcontractor is VAT registered, then VAT will also be included on that invoice. However, many advisors, many businesses, many companies incorrectly deduct CIS only off the labor element, and that's completely wrong.

Now, I've come across many people who've made that mistake, and this is one of the reasons that prompted this particular podcast. If HMRC decides to investigate with more vigor, then obviously there could be a lot of problems coming down the line. Any tax that's not being correctly accounted for, by the way, will typically mean pay the tax over, and fines and penalties will follow as well.

Now let's have a look at the idea in terms of a subbie where payments include travel, subsistence and accommodation. That's quite common. Now where a construction contract requires the contractor to pay a subbie expenses such as traveling and accommodation, then all those payments form part of the overall value of the contract.

What that means is all those items that are invoiced have to have CIS deductions applied at either 20 or 30. Now, I mentioned something called a gross certificate holder, so the value of your turnover over a six-month period is over a certain value, you can register for what's called a gross certificate, and therefore, what that means, once you get that certificate, you invoice your client,

no deductions are made accordingly. Now, whether that's a good thing or a bad thing, I'll comment at the end of that podcast. Now, when are CIS deductions not due? Now, effectively, when the subbie is allowed to use the contractor's own facilities such as the vehicles or accommodation, then no deduction will be due.

However, if the third party facilities are being used, also no deduction will be due. Now, that's not that common. Most of the clients that I deal with, most of the people I come across, they'll be using their own vehicles, they'll be making their own accommodation, provision, they'll charge for their subsistence, and all that is subject to CIS deductions.

Again, either a 20 or 30, or if you do have a gross certificate, no deductions will be taken off. Now, one way around that, if the subcontractor doesn't want to suffer that tax at source is for the contractor to arrange for that accommodation directly themselves, and they receive the invoice directly, therefore no burden force on the subcontractor.

Now, a couple of things to note here, folks, in terms of the reporting requirements. So if you are the contractor, when you present your invoice to your client, your client may or may not take off CIS off your invoice. When you pay your subbies, you have to take tax off their invoices as well. So if you imagine you've got a seesaw now, a set of scales where you've got CIS that you've suffered on one side and CIS that you've had to pay out on the other side.

Now, if you are a registered company, what happens is you are allowed to offset the CIS that you suffered during the month against the CIS that you've had to pay out. Now, if there is an excess, you've suffered more than you've actually deducted, then that excess remains on account until the end of your financial year when you can offset that against any corporation tax or other tax liabilities.

Now, if you are a sole trader, that offset is not allowed and what will happen is you’ll suffer that and that claim has to be made when you prepare and submit your personal tax return. Now, let's just summarize what we have. We've talked about a subcontractor and a contractor. You can be both, and if so, you need to register separately for both of those as well.

We've talked about the rates of deduction, which can vary from zero if you're a gross certificate holder to as high as 30% if you're either not registered or if you've got any issues with your tax records. If they're not brought up to date, then HMRC will say that 30% has to be withheld from that. Remember, this is not a discretionary choice for the individual contractor.

It’s what HMRC will tell you through the verification process. When you invoice your client for your services, whether that's travel, subsistence in your labor, all of that is subject to CIS deductions. Returns have to be made typically on a monthly basis to HMRC and the primary role of the contractor and the subcontractor is going to be acting as the tax collector on behalf of HMRC. Folks, I hope you've got some value from this podcast.

Share some comments, share some feedback. If you know of anyone who you think will benefit from this podcast, please share it with them, and until next week, have a good week. We hope you enjoyed this episode and appreciate you taking the time to listen to the show. We hope you got some value. If you did, then we'd love it if you shared the episode.

We look forward to you joining us next week for another I Hate Numbers episode.