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CIS Contractor's Monthly Return (CIS300) - Explained

CIS Contractor’s Monthly Return (CIS300)

CIS Contractor's Monthly Return (CIS300) - Explained

by Daniel at Taxfile.

The CIS Contractor’s Monthly Return is a mandatory requirement for contractors operating within the Construction Industry Scheme (CIS). It acts as a mechanism for contractors to disclose to HM Revenue and Customs (HMRC) payments issued to subcontractors and the corresponding tax deductions withheld from those payments. By providing HMRC with information regarding payments rendered and the accompanying tax deductions, the CIS Contractor’s Monthly Return guarantees transparency and adherence to regulations within the construction sector. In today’s guide, we explain the various components of the monthly ‘CIS300’ return, how the process works, key deadlines, the ramifications of non-compliance, and much more.

Key Components of the Monthly Return

The CIS Contractor’s Monthly Return typically includes the following key components:

This section includes information about the contractor, such as their name, Unique Taxpayer Reference (UTR), and contact details. Ensuring accuracy in this section is crucial for HMRC’s records and communication purposes.

Contractors must provide details of all subcontractors they have engaged during the reporting period. This includes the subcontractors’ names, UTRs, and payment amounts.

Contractors must report the total payments made to each subcontractor during the reporting period. This information helps HMRC track payments within the construction industry and verify compliance with tax obligations.

Contractors are required to calculate and report the tax deductions made from payments to subcontractors. The deducted amounts are typically based on the subcontractors’ verification status and tax treatment under the CIS.

The Monthly Return concludes with the calculation of the total amount due to HMRC, taking into account the tax deductions made from payments to subcontractors.

Deadlines and Reporting Periods

The CIS Contractor’s Monthly Return deadlines follow a structured timeline, which includes:

  • The submission deadline — contractors must submit their Monthly Returns to HMRC by the 19th of each month following the end of the reporting period. (Contractors’ payments to HMRC must also be made by this date).
  • The reporting period covered by each Monthly Return — which typically spans from the 6th of the previous month to the 5th of the current one.

Making Your CIS Payments to HMRC

Once you’ve calculated the total CIS deductions, prepare to make the payment to HMRC. You will need to have the following information ready:

  • Your Unique Taxpayer Reference (UTR) number;
  • Your payment reference, which is your 13-character Accounts Office reference number followed by the letter ‘C’ (e.g., 123PA12345678C);
  • The amount you’re paying.

HMRC offers various payment options for settling your CIS liabilities, which are explained here.

  • A contractor who operates as a limited company and also acts as a subcontractor might find that they are exempt from making any payments to HMRC. Subcontractors who do not have gross payment status will incur CIS deductions, which can then be used to offset any CIS payments owed to HMRC. This is exclusively available to limited companies. Please look out for our forthcoming blog focused on the CIS claim — a hyperlink will follow here once it’s live.

Implications of Non-Compliance

Failure to meet CIS Contractor’s Monthly Return deadlines can lead to various consequences, which may include the following:

  • Penalties — HMRC may impose penalties for late or non-submission of Monthly Returns, which can escalate over time.
  • Loss of benefits — non-compliance with CIS obligations, including Monthly Return deadlines, can lead to loss of benefits such as gross payment status, affecting contractors’ cash flow and competitiveness.

Managing the CIS Monthly Return Process

For contractors, efficiently managing the CIS Contractor’s Monthly Return process involves the following steps:

1. Maintain Accurate Records

Contractors should maintain accurate records of payments made to subcontractors and tax deductions applied. This includes keeping track of invoices, receipts, and CIS statements.

2. Timely Submission

The Monthly Return must be submitted to HMRC by the 19th of each month following the end of the reporting period. Contractors should ensure timely submission to avoid penalties and maintain compliance.

3. Use HMRC Online Services

HMRC provides online services for submitting CIS returns, making the process convenient and accessible for contractors. Registering for and using these online services can streamline the submission process and reduce administrative burdens.

The CIS Contractor’s Monthly Return is the key tool through which to report payments and tax deductions accurately to HMRC. Understanding its components and effectively navigating the submission process helps to ensure that contractors are compliant — and also avoids unnecessary penalties.

Rest assured, though: Taxfile is here when you need help with CIS returns and accountancy for construction workers, bookkeeping, CIS tax rebates for subcontractors, limited company accounts, and any tax-related matters that require professional help. We’re happy to provide guidance on compliance requirements, tax calculations, record-keeping practices, and much more.

Setting Up for Making Tax Digital - Bookkeeping, Record-Keeping Etc

Setting Up for Making Tax Digital

Setting Up for Making Tax Digital - Bookkeeping, Record-Keeping Etc

by Sue at Taxfile.

Whether you’re new to self-employment and have just started to run your own business, or have been doing it for a while – the fact is: Making Tax Digital (‘MTD’) is coming and it would be best to get set up in the right way, now.

Record-Keeping for Making Tax Digital

Keeping your personal life & your business completely separate is the best policy. It keeps things streamlined and will also save you money when your tax agent comes to do your bookkeeping & tax returns. So:

  • Set up a separate bank account just for your business;
  • Pay for your expenses from this account;
  • Pay income from your sales into it;
  • Keep an ongoing file for each tax year, where you put all your expenses, receipts & invoices;
  • Include copies of your sales invoices in that file too;
  • Keep the file in monthly order, so that accountants/tax advisors like Taxfile can easily cross-check the invoices to the bank statements and analyse your costs accurately.

Setting Up Digitally

Making Tax Digital means that you must run your business through a digital traceable source. The best way to do this is to allow us, if we are your tax agent/accountant, to set up your bank statements to feed automatically into accounting software like ‘Xero’. Alternatively, we can accept bank statements downloaded in CSV format, which we would then transfer to Excel spreadsheets.

Cash & Card Sales

If you are making cash & card sales, set up an app on your smartphone like ‘Sum Up’ or ‘Square’ so that you will be complying with MTD – your bank can also supply you with a PDQ card reader to accept your cash/card sales. We can upload your sales reports from these services and include them in your sales figures.

Accurate record-keeping is the cornerstone of every successful business

Moving to Quarterly Reporting

Here at Taxfile, we can currently run your bookkeeping for you quarterly or annually. However, when HMRC implement MTD fully in 2026, tax returns will need to be submitted each quarter — no longer just once a year. We’re therefore recommending that everyone gets used to sending in their bookkeeping records quarterly.

Quarterly bookkeeping also allows us to monitor your sales turnover and alert you at the appropriate time if you are approaching the level of sales that would require you to get registered for VAT. Finding out at the end of the year that you have already gone over the threshold — and should have been charging VAT at an earlier date — can be very costly.

Contact Taxfile – for All Your Tax & Accounting Needs

We’re Tax Advisors & Accountants in Tulse Hill and Dulwich, South London

Come and chat with one of our friendly team in the Tulse Hill office about getting things set up & ready in good time. Or call for a telephone appointment to discuss what will be best suited to your particular business operations.

Whether you are a sole trader with no staff or subcontractors for a larger concern, we are here to help every size of business get set up on the right path — for getting MTD-ready.


Taxfile is a tax advisor and accountant with offices in Tulse Hill, and Dulwich in South London.

Understanding Overpayment Relief – Types, Eligibility & How to Claim

Understanding Overpayment Relief

Understanding Overpayment Relief – Types, Eligibility & How to Claim

by Mohamed at Taxfile.

Have you ever felt that you’ve paid more in taxes than necessary? Whether due to calculation errors, changes in personal circumstances, or evolving tax laws, overpayments can happen to anyone. The good news is that there’s a way to reclaim those excess funds through the process of overpayment relief claims. In this comprehensive guide, we’ll walk you through the ins and outs of reclaiming your hard-earned money.

What is Overpayment Relief?

Overpayment relief allows you to recover money you’ve mistakenly paid to HMRC within four years after the end of the tax year in which the overpayment occurred. It’s a financial safety net that allows you to correct discrepancies and regain control of your finances. Understanding the concept is the first step toward putting your overpaid taxes back where they belong – in your pocket.

Types of Overpayment

The overpayment must be for income tax, capital gains tax (CGT), Class 4 National Insurance contributions (NICs), or corporation tax. It applies to both overpayments and excessive assessments.

Eligibility Criteria

You must have a valid reason for believing you overpaid tax. This could be an error in your tax return, incorrect coding by HMRC, or changes in your circumstances affecting your tax liability. You cannot claim overpayment relief simply by correcting your tax return after the deadline.

Claiming Overpayment Relief

You need to submit a formal claim to HMRC in the correct format, explicitly stating that it’s for “overpayment relief.”

The claim should clearly identify the tax year, the amount you believe you overpaid, and the reason for the overpayment. Include any supporting evidence, like documents confirming income, deductions, or expenses. Your claim must be submitted within specific time frames — generally, four years from the end of the tax year for which you’re claiming. Special rules apply for late claims.

Claim Format

Your claim must be made in writing, stating the tax year, the amount overpaid, the reason for your claim, and whether you’ve previously appealed. You cannot claim through your tax return.

For more information please refer to the HMRC website or get in touch with Taxfile.

Tax & Accountancy Help from Taxfile

At Taxfile we are skilled at identifying opportunities for additional savings, deductions, and credits that individuals might overlook. You can call us on 020 8761 8000 to schedule a free 20-minute, no-obligation consultation for any tax-related matter — or simply use the buttons below:

Taxfile is a tax advisor and accountant in Tulse Hill at 25 Thurlow Park Road, Tulse Hill, London SE21 8JP. We’re on the corner at the junction of Birkbeck Hill and the South Circular (A205), within easy walking distance of Tulse Hill station (map). We also have a Dulwich office.

Understanding Basis Period Reform for Self-Assessment Tax in the UK

Understanding Basis Period Reform for Self-Assessment Tax in the UK

 

Understanding Basis Period Reform for Self-Assessment Tax in the UK

Are you a sole trader or in a partnership? 

Do you have different accounting dates from the standard 6th of April to the 5th of Apri?

If you answered YES to both questions, some IMPORTANT changes will apply for the tax year 2023-24.

The concept of the basis period determines the time frame used to calculate taxable profits or losses for self-employed individuals, partnerships, and some trusts.  It marks a departure from the traditional “current year” basis, where business profits were taxed based on the accounting period ending within the tax year. Instead, it introduces a “tax year” basis, aligning taxable profits with the UK’s standard tax year, running from 6 April to 5 April. Read more

VAT in the UK: a comprehensive guide including what it is, the different rates, registering, returns, reclaiming it, the different schemes and more.

Navigating the VAT Landscape in the UK: A Comprehensive Guide

VAT in the UK: a comprehensive guide including what it is, the different rates, registering, returns, reclaiming it, the different schemes and more.

Value Added Tax (VAT), a consumption tax levied on most goods and services in the UK, plays a significant role in the nation’s economy. Whether you’re a sole trader, limited company business owner or simply a curious consumer, understanding VAT is crucial for navigating the UK’s tax system effectively. Today’s comprehensive guide explains what it is, the various VAT rates, when you need to be registered for the tax, VAT schemes, and more. Read more

Pension Contribution Deadline Extended

Deadline for Voluntary Insurance Contributions Extended to 5th April 2025

Deadline for Voluntary Insurance Contributions Extended to 5th April 2025

The original deadline for buying National Insurance ‘credit’ was 31st July 2023, but you can now ‘buy’ incomplete years to boost your state pension until 5th April 2025. The extension was approved by the Government, giving HMRC more time to deal with the process.

You can view our original blog on what you need to do to plug the gaps in your National Insurance contributions here.

How do I pay myself as a Director?

This is a question we often face from new company directors, how to pay yourself from the company.

As part of our £375+VAT package for a new limited company we offer the following;

  • company formation (including the option to have the company phrased as a special purpose vehicle for a property rental company)
  • we will register a single director with HMRC for self-assessment
  • we set up the payroll scheme
  • we arrange your chart of accounts on online software and set up the bank feed so transactions are automatically recorded

So the two ways to get paid are in the form of a monthly salary run from a payroll set up by the limited company and the second way is through dividend allocations based on the company’s annual post-tax profit.

A salary is treated as an expense to the business, therefore decreasing profits, reducing corporation tax, and in turn, minimising the amount of dividends available to then be attributed to each shareholder.

We suggest (correct as of the 23/24 tax year) a salary of £9,096 per annum (£758 p/m) as this is the minimum amount to qualify for a state pension (also known as the secondary threshold).  If there are 2 or more directors (on the secondary threshold or above) or any additional staff on the payroll above the secondary threshold for the company, the Employment Allowance offered by the government becomes available, giving the company £5,000 ‘pot’ towards the employer’s NI contributions.

If the company posts a profit, the value of the post-tax profit can be allocated as dividends to the shareholder(s) of the company.  If there is more than one shareholder, then the dividends are allocated dependent on the percentage of shares held by each shareholder.

Unfortunately, the tax efficiency of dividends is being reduced.  For the 22/23 tax year there is a £2,000 tax-free allowance, for 2023/24 there will only be a £1,000 tax-free allowance and for 2024/25 it has been stated that it will be halved again to £500.

The amount of tax you pay on dividends will be dependent on your income tax band which includes your tax-free allowance, and any earnings from the limited company and any other earnings outside.

This will need to be declared on a self-assessment tax return to HMRC, which covers the period of the UK tax year from 6th April to 5th April every year.

As part of our £375+VAT package we can enrol one shareholder/director onto the self-assessment scheme with HMRC to obtain a Unique Tax Reference (UTR) to allow them to comply with their personal tax obligations in the future.  Contact us on 020 8761 8000 for more information.

What does it mean to be a Director?

Your obligations as a Director can be ‘taxing’.

Running a successful limited company typically involves administrative duties outlined by Companies House & HMRC. As the director you’ll also be responsible for ensuring the finances of the company are regulated and healthy.  At Taxfile we can help you focus on growing your business and take care of all your accounting needs.

In order to fulfil your obligations, after your limited company’s financial year comes to a close, it must prepare a set of final accounts and a company corporation tax return.

The company’s final accounts are prepared from the company’s financial records for the period that covers your company’s financial year and must include:

  • a balance sheet showing the value of everything the company owns, owes and is owed on the last day of the financial year
  • a profit and loss account showing the company’s sales against its running costs and highlighting the profit or loss it has made over the financial year
  • notes about the accounts
  • a director’s report (unless you’re a ‘micro-entity’)

The accounts must either meet ‘International Financial Reporting Standards’ or ‘New UK Generally Accepted Accounting Practice’.

At Taxfile we can provide support for small to medium businesses that require accountants to compile and file their full company accounts ready for the shareholders, people of significance to the company, Companies House and HMRC as part of your company corporation tax return.

We can assist you with the bookkeeping and bank reconciliation to ensure that your accounting records are complete and include:

  • all money received and spent by the company
  • details of assets owned by the company
  • debts the company owes or is owed
  • stock the company owns at the end of the financial year
  • all goods bought and sold

As the director you are solely responsible that your accounts and tax return meet the deadlines for filing with Companies House and HMRC. From the accounts you can also deduce how much Corporation Tax to pay. The dates you will need to remember:

  • File the first set of accounts with Companies House 12 months after the date you registered with Companies House
  • File annual accounts with Companies House 9 months after your company’s financial year ends
  • Pay Corporation Tax or tell HMRC that your limited company does not owe any 9 months and 1 day after your ‘accounting period’ for Corporation Tax ends
  • File a Company Tax Return 12 months after your accounting period for Corporation Tax ends
  • File a Confirmation Statement 12 months after: company incorporated, company accounts submitted, or last confirmation statement

As a Director do I need to file a Self-Assessment Income Tax Return?

See our blog HERE

If you are thinking about setting up a limited company we are offering a special price of £375+VAT for the following;

  • company formation (including the option to have the company phrased as a special purpose vehicle for a property rental company)
  • we will register a single director with HMRC for self-assessment
  • we set up the payroll scheme
  • we arrange your chart of accounts on online software and set up the bank feed so transactions are automatically recorded

For more information about any of our tax- and accountancy-related services, call us on 020 8761 8000.

Forming a Limited Company?

Having been the accountants of choice for individuals and businesses in the South London area, we have recently noticed a surge of individuals moving away from the sole trader status and enquiring about forming a limited company.

The reasons for changing status have varied; someone mentioned they should be, their customers needing them to be, being worried about having a personal liability against the business, to hoping to be more tax efficient.

What do we mean by a limited company?

A limited company is an organisation that is set up to run your business. A business becomes ‘limited’ once the company name and its owner(s) have been registered with Companies House and when limited status is granted, it becomes a distinct entity from its owners.

A limited company structure creates a distinct border between the business owner and the business itself, and under the eye of law, the business becomes a separate legal entity in its own right, becoming responsible for its own actions and finances.  This in turn limits the liability of the owner from any risk the business may need to take.    So if you are a small business expanding & possibly needing employees & assets, then a limited company is a good idea.

At Taxfile we are helping a lot more clients make this transition from a sole trader to limited status.

We can help you set up a private limited company, guide your through the process of what happens and what you need to do.  We offer an all-encompassing service from the setting up to filing the corporation tax returns.

We are offering a special price of £375+VAT for the following;

  • company formation (including the option to have the company phrased as a special purpose vehicle for a property rental company- SPV)
  • we will register a single director with HMRC for self-assessment
  • we set up the payroll scheme
  • we arrange your chart of accounts on online software and set up the bank feed so transactions are automatically recorded

A limited company will:

  • need to keep company records
  • report any changes to Companies House & HMRC
  • need to file an annual company tax return along with the company’s accounts, giving an undistorted view of its finances.

As a director of a private limited company you will:

  • make decisions that benefit the company rather than yourself
  • abide by the rules and regulations outlined by the company articles of association, which are written rules about running the company agreed by the shareholders or guarantors, directors and the company secretary
  • notify any shareholders if you might benefit personally from a company transaction
  • always act with the intention of making the company successful.
  • In forming a limited company you are limiting your personal liability but in doing so you cannot abuse your power with the limited liability to take selfish and unnecessary risks.

At Taxfile we can advise you on setting up a private limited company and take care of all these tasks for your private limited company — and avoid any complications down the line.

Starting a limited company is a relatively straightforward administrative task that starts out with choosing an available company name from Companies House to filling and filing a series of forms. At Taxfile we can ensure that all your forms are compiled correctly, providing ongoing support.

To set up your private limited company you will need at least one director and one shareholder.  As the business owner(s) you would then take a salary/wage from the business.  We can advise you how to best set up your salary and dividends to pay less tax.

Once you have a limited company set up you will need to open a new bank account in the name of your new company.  Our advice to clients, is to try and keep all the business income and expenses restricted within this one bank account and to avoid any personal transactions overlapping into this account.

It is also important to remember to transfer all business-related expenses into the company’s name and move any payment plans over to the new bank account.

If you would like help and advice about forming a private limited company please call us on 020 8761 8000.