This step-by-step guide to registering as a CIS subcontractor online shows you what you need to do from start to finish. how to covers everything you need to know about CIS, registering as a subcontractor, how to check your tax status, your responsibilities and some tips on reducing your tax bill.

You need to register as a subcontractor if you work for someone in the construction industry.

Subcontractors affected by CIS need to follow the rules set out by HMRC. The tax scheme was introduced to reduce tax evasion within the construction industry, where subcontractors who were self-employed were working but not declaring their income for taxes. Or they were faced with huge unexpected tax bills that they struggled to pay.

How Does the Construction Scheme Industry Work?

Construction Scheme Industry is often referred to as ‘CIS’.

The CIS Scheme affects contractors who employ self-employed subcontractors. Contractors are legally required to deduct a fixed amount every time they pay a subcontractor.

This set amount is usually 20% for contractors registered for CIS or 30% for subcontractors who are not CIS registered.

Payments can be made without any deduction in special circumstances (there’s more about “Gross Payment Status later).

This CIS deduction is essentially a tax deduction and is paid over to HMRC on the subcontractor’s behalf.

Anyone who is self-employed must report their earnings and work out their tax once a year using a self-assessment tax return by 31 January each year.

So when a subcontractor completes their tax return each year they can deduct for allowable expenses to reduce their tax bill, balance up how much tax has been deducted by the contractors they worked for and, for some, get a tax refund.

Are CIS Subcontractors Classed as Self-Employed?

Essentially there is no difference between being a subcontractor and being self-employed.

But under CIS the contractors you work for will make a tax deduction every time they pay you. This deduction is unique to the Construction Industry and other self-employed people are unlikely to have this deduction made.

Apart from this, the HMRC requirements are the same. Whether you are self-employed or a subcontractor, you’ll be required to:

  • Keep records of your income and expenses;
  • Work out your own taxes;
  • Submit a self-assessment tax return form by 31 January each year.

Do You Need to Register as a Subcontractor?

Before you register with HMRC as a subcontractor, it will help to check whether you need to register. If you are exempt from CIS you’ll avoid needing to set up as self-employed.

HMRC sets out really detailed rules as to what it considers construction work and who falls under the rules of CIS.

Their rules cover most construction work in the UK including work to:

  • preparing the site, eg laying foundations and providing access works
  • demolition and dismantling
  • building work
  • alterations, repairs and decorating
  • installing systems for heating, lighting, power, water and ventilation
  • cleaning the inside of buildings after construction work
  • a permanent or temporary building or structure
  • civil engineering work like roads and bridges

Who Doesn’t Need to Register as a Subcontractor?

Certain trades, although involved in the construction industry, are exempt from registering for CIS.

This includes:

  • architecture and surveying;
  • scaffolding hire (with no labour);
  • carpet fitting;
  • making materials used in construction including plant and machinery
    delivering materials;
  • work on construction sites that’s clearly not construction, eg running a canteen or site facilities

If you are unsure whether you need to register as a contractor, then call the HMRC CIS Helpline on 0300 200 3210 to discuss your situation.

How to Register as a CIS Subcontractor Online

There is a two-step process to Register as a Self-Employed CIS Subcontractor. Both steps can be completed online and you can do it yourself in most cases.

You’ll need to:

  1. Register as Self-Employed
  2. Register with HMRC as a Subcontractor

Get yourself registered as soon as possible to avoid payment issues and penalties from HMRC.

1. How to Register as Self-Employed Online

If self-employment is new to you, you’ll need to register with HMRC online.

If you are already registered with HMRC and submit a tax return for another reason. Skip to Step 2 – How to Registered for CIS Online below and read more about gross payment status if you wish.

If you registered for self-employed twice, HMRC will expect two tax returns from you.

Before you start the registering as self-employed online, make sure you have your National Insurance number handy.

You’ll then need to complete the following steps:

  1. Visit the HMRC website and choose the option to “Register Online”;
  2. Set up your HMRC online account so you can manage your taxes online;
  3. Enrol for self-assessment online;
  4. Wait for your UTR number to be posted to you (can take up to 10 days)
  5. Wait for your activation code so you can complete setup of your HMRC online account.

Keep your UTR number and login details for your HMRC online account safe. You’ll need these to manage your taxes and register as a CIS subcontractor.

Need my help? Here’s my video guide to help you register as self-employed

2. Register as a CIS Subcontractor Online

Once you have successfully registered as self-employed and have received your UTR number from HMRC then you can register as a CIS subcontractor online.

To register as a CIS subcontractor online you’ll need to:

  1. Have your UTR number and HMRC Online account login details ready;
  2. Visit the HMRC website;
  3. Choose the option to “Register for CIS Online”;
  4. Enter your HMRC Online Account User ID and password;
  5. Complete the online CIS registration form.

Step-by-Step Guide to Completing the Online CIS Registration Form

Step 1

Choose whether you are registering for net or gross CIS payments (see below for more information on gross CIS payments).

CIS registration form choose gross or net status

Step 2

Enter your personal details, including your national insurance number. Your UTR number will be automatically included on the form, but you should check it is correct.

CIS registration form add your personal details

Step 3

Enter details about your self-employment and whether you have been paid as a subcontractor before.

register as a CIS subcontractor business details

Step 4

If you use a trading name, enter it now for HMRC as well as your address.

register as a CIS subcontractor trading details

Step 5

You’ll be presented with a summary of all the information you have entered. Check it is all correct, use the “edit” button if anything is incorrect.

register as a CIS subcontractor check your summary

Step 6

Finally, you will be presented with a declaration for you to agree to. Read the CIS declaration through and, if you are happy, press “Accept and Register”.

register as a CIS subcontractor declaration

What is CIS Gross Payment Status?

Subcontractors with CIS Gross Payment Status receive their payments in full, without any deductions.

That means they will pay all their tax and national insurance every time they complete a self-assessment tax return. And possibly pay a payment on account every July, depending on their status.

Who Qualifies for CIS Gross Payment Status?

Not everyone qualifies for CIS gross payment status. To qualify you must meet the criteria set out by HMRC.

You’ll need to show that you:

  • have paid all your tax and National Insurance on time in the past;
  • work in the UK construction industry;
  • run your business through a business bank account.

Your turnover must also be £30,000 if you are self-employed excluding:

  • VAT and
  • The cost of materials.

How to Apply for CIS Gross Payment Status

If you are eligible, you can apply for gross payment status:

  1. As part of your application to register as a subcontractor online;
  2. By calling the HMRC CIS Helpline on 0300 200 3210

Your Gross Payment Status will be reviewed by HMRC every year. If it is found that you are no longer eligible, your status will be removed and they will write to you to explain your decision.

Always pay your taxes and file your tax return on time to retain CIS gross payment status.

How to Register as a CIS Subcontractor by Phone

If you cannot go online, you can choose to register as a subcontractor by phone.

You’ll need to call the HMRC CIS Registration phone line on 0300 200 3210.

How Long Does it Take to Register for as a CIS Subcontractor Online

If you are already registered as self-employed then registering as a subcontractor may only take a few days.

If you need to register as self-employed then you will need to allow more time. Registering as self-employed and getting a UTR number can take up to 10 days. You can only proceed to register as a CIS subcontractor once this is completed.

What Happens if You Fail to Register as a CIS Subcontractor

The consequences for failing to register for CIS include:

  • Automatic deduction of 30% from your pay by the contractor you work for;
  • An automatic penalty of £100 by HMRC for failing to register as self-employed;
  • Further automatic penalties for failing to submit a self-assessment tax return forms;
  • Penalties and tax estimates made by HMRC that you will need to pay unless you submit a self-assessment tax return.

So if you are undertaking construction work, don’t delay and make sure you get yourself registered.

What Happens When You Are Registered as a CIS Subcontractor

Once registered as a subcontractor you’ll need to:

  • Invoice your contractors for the work you have done and any materials you have bought;
  • Keep hold of your CIS statements for tax time, so you know how much tax has been deducted from your payments;
  • Complete a self-assessment tax return online by 31 January each year;
  • Claim for all your expenses to reduce your tax bill;
  • Pay your taxes by 31 January each year;
  • Keep records and receipts for all your income and expenses for 6 years.

What is Self-Employment?

What is a CIS Payment and Deduction Statement?

A CIS statement is a payment and deduction summary which be issued every time a contractor pays you.

It details the amount you have been paid, along with details of the tax that have deducted and paid to HMRC.

You must make sure the contractor you are working for gives you a statement every single time they pay you.

It is a legal requirement and will make filling in your CIS tax return easy, so don’t lose them.

CIS statements normally includes the following details:

  • Your name;
  • Your UTR number;
  • Your home address;
  • The month statement covers;
  • The rate they have used to make your tax deduction;
  • The amount they have paid you, detailing out the amount of tax deducted on your behalf.

CIS Invoice Template for Subcontractors

As a registered CIS contractor, you’ll need to invoice your contractors for work completed each month so you can get paid.

An invoice is a demand for payment with details of what services and goods you have provided.

Here is a CIS invoice template for subcontractors for you to download.

You should note that your CIS deduction should be calculated on labour only, not materials.

So if you are charging your contractor for any goods or materials, they should not make a CIS deduction on them when they pay you.

Which Invoice Number Should I Start With?

Allowable Expenses for CIS Subcontractors

The easiest way to reduce your tax bill when you are self-employed is to make sure that you claim all the expenses you can against your income.

You can’t always claim for all your expenses, just ones that HMRC consider allowable.

Typical allowable expenses for CIS subcontractors include:

It is really important to keep hold of receipts for all your expenses, not only is it a requirement of HMRC but it means you won’t forget to claim anything when tax time comes.

For many subcontractors, once they have prepared their CIS tax return they find that they are owed a tax refund. This is due to the combination of tax already deducted by contractors they worked for and claiming for allowable CIS expenses.

Do You Need an Accountant If You’re Self-Employed?

Updated 19 July 2019

Anita Forrest

Anita is a Chartered Accountant with over a decade of experience taking self-employed business owners from financially confused to business savvy.
She is the creator of the ‘Go Self Employed’ website, which is her corner on the internet where she makes self-employment less terrifying.
Anita Forrest

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