21 articles

CIS Compliance

Practical guides on cis compliance for UK construction subcontractors and contractors.

Sort:

CIS Compliance
Do Bookkeepers Need to Be Registered? What to Check Before You Hire One
There is no register you must join to call yourself a bookkeeper in the UK, but there is one supervision requirement nobody keeping books for clients can lawfully skip. This guide sets out the anti-money laundering supervision rule, how to verify it before you hand over a year of CIS payment and deduction statements, the qualifications that actually mean something, the red flags worth walking away from, and why the penalties for a wrong return land on the subcontractor rather than the bookkeeper.
4 August 20268 min read
CIS Compliance
Landlord Electrical Safety Checks: What to Charge and How to Certify
Every private rented home in England has needed a valid Electrical Installation Condition Report at least every five years since 1 April 2021, and the maximum financial penalty for a landlord without one is now up to £40,000 per property. That legal duty is a standing, repeating revenue line for any electrician who sets the job up properly. This guide covers what the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 actually oblige the landlord to do, where the 28-day remedial window puts the money, what the market is paying in 2026, how to build a landlord and letting agent client base, and how CIS and VAT apply to the work.
4 August 20269 min read
CIS Compliance
How Long Do Large Construction Firms Actually Take to Pay? The Data
Every large UK business must publish, by law, how long it takes to pay its suppliers. We compiled that statutory disclosure for 225 large construction businesses and cross-checked each one against its registered Companies House SIC code. The median is 33 days. Almost one in four takes more than 45 days on average, and eight companies pay over half their invoices later than 60 days. This article works through what the data shows, names the extremes at either end (using each company's own published disclosure), and sets out what a subcontractor should actually do about a slow-paying main contractor, from payment terms to retentions to CIS cashflow.
23 July 20265 min read
CIS Compliance
Which Construction Sub-Sectors Have the Most Insolvencies (And Which Are Getting Worse Fastest)
Insolvency Service data broken down by SIC division shows that specialised construction trades, electrical, plumbing, plastering, joinery, groundworks and demolition among them, account for more than half of all construction company insolvencies in the trailing twelve months. But the sub-sector with the fastest-deteriorating trend over the last decade is building construction, where insolvency counts have risen 79.9% since 2016, more than twice the rate of civil engineering. This article separates the two questions that get conflated in headline construction insolvency figures: which sub-sector carries the largest share of failures today, and which sub-sector is getting worse the fastest.
23 July 20265 min read
CIS Compliance
UK Construction Insolvencies: The Decade Trend and What It Means for CIS Subcontractors
Construction company insolvencies in England, Wales and Scotland rose 49.9% between 2016 and 2025, from 2,793 to 4,188 per year. Creditors voluntary liquidation accounts for nearly three in four cases, and the practical consequences for subcontractors are severe. Unpaid invoices, trapped retentions, and the cascading effect of main-contractor failure are real and common risks. This article explains what the data shows, what each insolvency procedure means for an unsecured creditor, and what CIS subcontractors and trade businesses can do to reduce their exposure.
20 July 202612 min read
CIS Compliance
CIS End of Year: What Contractors and Subcontractors Must Do
There is no annual CIS return filing event. The Construction Industry Scheme runs on monthly returns throughout the year, and year-end is simply the close of the final tax month on 5 April. But that close triggers a different set of obligations for contractors and subcontractors depending on how they trade. This guide sets out what each party must do between 5 April and the weeks that follow, and how to avoid the mismatches that delay repayments.
14 July 20267 min read
CIS Compliance
Unallocated Credit on Your HMRC Account: How to Reclaim CIS Deductions
If your HMRC account shows an unallocated credit and you are a CIS subcontractor, the money has arrived but HMRC has not yet matched it to your tax position. This guide explains what that term means, why limited companies use the EPS route to recover deductions monthly, why credits sometimes stall (mismatched deduction statements, wrong employer reference, late EPS), and the practical steps to get the money moving again including repayment timelines, phone versus webchat, and the year-end Corporation Tax offset. Sole traders follow a different route via Self Assessment.
14 July 20268 min read
CIS Compliance
CIS April 2026 Rule Changes: GPS Revocation, Nil Returns and Director Liability Explained
Finance Act 2026 reshaped the Construction Industry Scheme from 6 April 2026. HMRC can now revoke gross payment status immediately where a contractor knew or should have known about supply-chain fraud, the reapplication ban after a fraud-grounds removal jumps from 1 year to 5 years, new knowledge-based penalties fall on anyone who pays or makes a return knowing a connected party deliberately failed to comply (FA 2004 s.62A charges 20% of the payment, s.62B recovers 100% of the sum a false return treats as paid), and the CIS300 nil return is mandatory again. This guide explains each change, works the cash-flow and liability numbers in real pounds, and sets out the due-diligence checklist that keeps you on the right side of the new standard.
12 June 202614 min read
CIS Compliance
CIS Deadline Calendar 2026/27: Monthly Returns, SA, MTD and GPS
Missing a CIS deadline costs money. The penalty for a late monthly return starts at £100 and escalates quickly if left unresolved. This calendar sets out every CIS-related deadline for the 2026/27 tax year: the 12 monthly CIS300 filing dates, the nil return obligation reinstated from April 2026, the Self Assessment filing deadline, MTD quarterly update dates for higher earners, and the GPS review cycle. Every date is based on locked house-position figures from HMRC guidance.
12 June 20268 min read
CIS Compliance
CIS for Contractors: Your Monthly Responsibilities Checklist
Under CIS a contractor is the withholding agent, responsible for verifying subcontractors, calculating and deducting the right amount, issuing payment and deduction statements within 14 days, filing the CIS300 return by the 19th and paying HMRC by the 22nd every single month. This checklist walks through every step in order, with a worked example across three subcontractors and the full penalty picture for anything missed.
12 June 20267 min read
CIS Compliance
CIS Gross Payment Status: How to Qualify, Apply and Keep It in 2026
Gross payment status lets a construction subcontractor be paid in full with no CIS deduction taken at source, settling tax through Self Assessment or Corporation Tax instead. This guide explains the three qualifying tests, the turnover thresholds by entity type, the application and annual review, the tougher April 2026 anti-fraud regime, and the cash-flow cost of losing it.
12 June 202611 min read
CIS Compliance
CIS Monthly Returns: Deadlines, Nil Returns and Penalties (2026)
Every contractor registered for the Construction Industry Scheme must file a CIS300 monthly return with HMRC showing every payment made to subcontractors in the tax month. From April 2026 the rules tightened in two key ways, including a reinstated nil-return obligation and a new public sector exemption. This guide covers who must file, the exact deadlines, what verification you must complete before paying, what changes in 2026, and the full penalty ladder for late returns.
12 June 20268 min read
CIS Compliance
CIS Nil Return: The April 2026 Rule Every Contractor Must Know
From 6 April 2026, contractors must file a CIS300 nil return for every tax month in which they make no payments to subcontractors, or pre-notify HMRC that they are inactive for up to six months. The obligation was removed in 2015 and quietly reinstated eleven years later. Many contractors have no idea it exists. Miss it and the penalty clock starts the next day.
12 June 20266 min read
CIS Compliance
CIS Payment and Deduction Statements: What They Must Show and What to Do If You Are Missing Them
A CIS payment and deduction statement is the primary evidence for your Self Assessment refund claim. This guide explains exactly what a statement must contain, the 14-day issuance rule (statements due by the 19th of the following month), why there is no statutory annual CIS statement, what to do when a contractor refuses to issue one, and how to compile your total CIS deducted across multiple contractors for your tax return.
12 June 20269 min read
CIS Compliance
CIS Penalties and Appeals: The Complete Guide for 2026/27
Late CIS300 returns trigger an automatic £100 penalty per missed return, and the Self Assessment penalty ladder piles on interest and surcharges the longer a liability goes unpaid. From April 2026, nil returns are mandatory again for contractors, reopening a penalty risk many had forgotten about. This guide sets out every tier of the penalty regime, what counts as a reasonable excuse, how to appeal within the 30-day window, and what HMRC's interest rate means for late payments.
12 June 20269 min read
CIS Compliance
CIS Record Keeping: What to Keep, How Long to Keep It, and What HMRC Looks For
Poor record keeping is one of the most common reasons CIS refunds are delayed, compliance checks go badly, and penalties arrive unexpectedly. This guide sets out which records contractors and subcontractors must keep, minimum retention periods, the MTD ITSA digital record rules live from April 2026, and what HMRC typically asks for in a CIS enquiry.
12 June 20266 min read
CIS Compliance
Retention Payments and CIS: Tax Treatment, Timing and Cash Flow
Retentions are a routine part of construction contracts, but their interaction with the Construction Industry Scheme catches subcontractors out. The CIS deduction does not apply when you invoice; it applies when the retention is actually paid. Income is recognised for Self Assessment when the money is received. This guide covers the mechanics, record-keeping, cash flow planning for outstanding retentions, and what contractors must do when releasing a retention payment.
12 June 20268 min read
CIS Compliance
How to Verify Subcontractors Under CIS and Why It Matters
Before paying a subcontractor under the Construction Industry Scheme, a contractor must verify that subcontractor's status with HMRC. Verification tells the contractor which deduction rate to apply: 0% for gross payment status, 20% for a registered subcontractor, or 30% for an unregistered one. From 6 April 2026, verification has taken on a second, more urgent role as the foundation of the due diligence duty that protects contractors against GPS revocation and the new knowledge-based penalties under Finance Act 2026.
12 June 202612 min read
CIS Compliance
CIS Supply Chain Compliance and Due Diligence: What the April 2026 Rules Require
Finance Act 2026 shifted the CIS gross payment status regime from a compliance-only test to a conduct-based one. A contractor who fails to carry out reasonable due diligence on their supply chain can now lose GPS immediately, face a 5-year reapplication ban, and expose individual directors to personal penalties. This guide explains the new standard, the three core due-diligence steps, how to evidence them, and what the red flags look like.
12 June 20267 min read
CIS Compliance
Deemed Contractors Explained: Who They Are and What CIS Obligations They Have
A deemed contractor is a business that is not in the construction trade but crosses the £3 million construction expenditure threshold, measured over a rolling 12-month period, at which point the full CIS regime applies. This guide explains who the threshold catches, how the rolling 12-month test is calculated, what obligations arise, and what the April 2026 changes mean for deemed contractors.
12 June 20268 min read
CIS Compliance
Gross Payment Status and Cash Flow: What It Is Worth and How to Keep It in 2026
Gross payment status converts a 20% deduction at source into a 0% rate, leaving tens of thousands of pounds in the business as working capital every year instead of with HMRC. This pillar quantifies what GPS is worth at real turnover levels, models the cash-flow cost of losing it, and maps the April 2026 maintenance framework, from the annual compliance review to supply-chain due diligence and the new knowledge-based penalties under FA 2004 sections 62A and 62B (s.62A 20% of the payment, s.62B 100% of the sum a false return treats as paid).
12 June 202613 min read

Back to all articles