If you run a construction business and pay subcontractors, CIS is not something you can tidy up once a year. You need the right deduction rate, the right subcontractor details, and the right monthly information going to HMRC at the right time.
CBM Accounting Ltd helps UK contractors stay on top of that workload. We are chartered accountants and tax consultants serving businesses across the UK, with a strong focus on London, and we provide accounting, payroll, tax, HMRC compliance and outsourced back-office support that fits the practical demands of Construction Industry Scheme reporting.
CIS accountant support for UK contractors who need accurate monthly HMRC compliance
For contractors, CIS is mainly a compliance job with real financial consequences. HMRC requires contractors to tell it each month about payments made to subcontractors through a monthly return, and incorrect employment status reporting can trigger penalties of up to £3,000.
CBM Accounting supports contractors with the accounting and compliance work around those obligations, so you are not trying to manage monthly returns, subcontractor payment records and tax admin in isolation.
“CBM Accounting supports CIS contractor reporting in a regime where HMRC requires a monthly return and can charge up to £3,000 for the wrong employment status on that return.”
That matters if your internal admin is stretched, your subcontractor list changes regularly, or your finance process still relies on disconnected spreadsheets, emails and year-end catch-up. We help bring the monthly CIS workload into a more controlled routine, with clear communication on what is needed and when.
CBM Accounting helps contractors manage CIS deductions, registration support and tax records
CIS deductions are not optional judgement calls. Under HMRC rules, registered subcontractors are normally deducted at 20%, while unregistered subcontractors are deducted at 30%, and the deduction process starts from the gross invoice amount before the CIS percentage is applied.
CBM Accounting gives you practical guidance on CIS tax implications for contractors and subcontractors and helps you keep the underlying accounting records aligned with those rules, which reduces the risk of preventable reporting mistakes.
“CBM Accounting helps you work with CIS rates that are normally 20% for registered subcontractors and 30% for unregistered subcontractors.”
This is where a specialist CIS accountant adds value beyond basic bookkeeping. When your records are accurate from the start, deductions, reporting, tax returns and year-end accounts are easier to reconcile and much easier to defend if HMRC asks questions.
CBM Accounting can support the wider tasks that sit around CIS, including:
- bookkeeping and accounting for ongoing contractor records
- payroll services, including assistance with registering as a contractor or subcontractor
- guidance on CIS tax implications for contractors and subcontractors
- self-assessment and tax return support, including services tailored for CIS subcontractors
- HMRC compliance, VAT services, corporate tax and outsourced back-office accounting
That joined-up support is useful when CIS is only one part of your compliance picture. If you also need VAT, payroll, year-end reporting or day-to-day finance support, we can help you manage those obligations through one firm rather than splitting them across several providers.
Accounting, payroll and outsourced back-office support for London and UK construction businesses
Many contractors do not just need a return filed. They need a finance process that works every month, especially when subcontractor payments, payroll, VAT and general bookkeeping all affect the same cash flow and reporting cycle.
CBM Accounting combines accounting, payroll, HMRC compliance and outsourced back-office services so your CIS work sits inside a broader, workable finance function.
“CBM Accounting brings CIS-related accounting, payroll, tax returns and HMRC compliance into one UK service for contractors who need fewer gaps between tasks.”
That approach helps you avoid the common problem where one adviser handles year-end tax, someone else runs payroll, and nobody has full visibility of the records behind CIS deductions. We keep the process clearer, which makes deadlines easier to manage and reduces the need for last-minute corrections.
CBM Accounting also uses technology-driven, MTD-ready solutions where they support your wider finance operations. For contractors, that means more reliable record-keeping, cleaner reporting lines and a better base for VAT, management information and future growth.
Why contractors choose CBM Accounting for CIS-related accounting and tax support
CBM Accounting is not a generalist admin service. We are an accredited team with ACCA, CIMA, IFA and ICPA credentials, and our work covers accountancy, advisory, assurance, tax and back-office outsourcing.
For you, that means CIS support can be handled in the context of the rest of your business. If a deduction question affects payroll, if bookkeeping issues affect your tax return, or if CIS records flow into year-end accounts, we can deal with those connected issues without sending you from one provider to another.
Our clients also benefit from tailored, industry-specific strategies and proactive compliance support. In practice, that means we do not treat a contractor in London with regular subcontractor payments the same way as a landlord, a startup or a non-construction SME, even though we support those groups too.
When CBM Accounting is the right CIS accountant for your contractor business
CBM Accounting is a strong fit if you want more than basic data entry. We are particularly relevant when you need a firm that can connect CIS with the rest of your accounting and tax responsibilities.
You are likely to get the most value from CBM Accounting if:
- you pay subcontractors regularly and need tighter control over monthly CIS reporting
- you want support that covers bookkeeping, payroll, tax returns and HMRC compliance together
- you are a sole trader, partnership, SME or established company in the construction sector
- you need a London-focused UK accountant that can communicate clearly and deliver on time
- you want help that can continue beyond CIS into VAT, corporate tax, self-assessment and outsourced finance work
If that sounds familiar, the next step is simple. Speak to CBM Accounting about how you currently handle subcontractor payments, deductions and HMRC reporting, and we can help you put a cleaner, more reliable CIS process in place for your contractor business.
