Construction tax compliance - how CIS, VAT, CITB, and PAYE work together

Construction businesses face multiple overlapping tax obligations when paying for labour and services. Understanding how CIS, VAT, CITB, and PAYE work together helps you comply correctly and avoid costly mistakes.

This guide shows how these four systems interact on the same payment, with worked examples you can apply to your own business.

The four construction tax obligations

When you pay subcontractors or employ workers in construction, you may need to deal with all four of these systems:

CIS (Construction Industry Scheme) - tax deductions from payments to subcontractors, paid to HMRC
VAT reverse charge - construction services between VAT-registered businesses where the customer accounts for VAT
CITB levy - training levy based on your total labour payments (PAYE wages + net CIS payments)
PAYE - income tax and National Insurance for employees (not subcontractors - but employment status matters)

The key challenge is that these systems overlap but are not identical. A payment to a subcontractor may involve CIS, VAT reverse charge, and CITB simultaneously. Getting any one of them wrong creates compliance risk.

How CIS and VAT reverse charge interact

When you pay a VAT-registered subcontractor for construction services, both CIS deductions AND the VAT reverse charge may apply to the same payment. Understanding how these interact is essential for correct accounting.

The key principles:

CIS applies to labour - deductions are calculated on the labour element only, not materials
VAT reverse charge means no VAT on invoice - the customer accounts for VAT on their VAT return instead
CIS is calculated on the net (pre-VAT) amount - the reverse charge does not change CIS calculations
Both systems use CIS registration as a trigger - the reverse charge applies to supplies between CIS-registered businesses

CIS deduction and VAT reverse charge combined - worked example

Worked example showing how CIS deductions and VAT domestic reverse charge apply together on the same subcontractor payment. This is a common pain point for construction businesses where both regimes interact.

When a CIS-registered contractor pays a VAT-registered subcontractor for construction services, both CIS deductions AND the VAT reverse charge may apply. Understanding how these interact is essential for correct accounting.

Key principle: CIS deductions apply to the labour element of the payment. The VAT reverse charge means no VAT is added to the invoice - the contractor accounts for VAT separately on their VAT return.

Scenario: Subcontractor invoice for construction work with materials
Labour charge: £10,000
Materials provided by subcontractor: £2,000
VAT reverse charge applies: Yes - both parties VAT and CIS registered
Subcontractor CIS status: Registered (20% deduction rate)

Step 1: Understanding the invoice

The subcontractor's invoice shows:

Labour: £10,000
Materials: £2,000
VAT: £0 (reverse charge applies - marked on invoice)
Invoice total: £12,000

The invoice must state: "Reverse charge: Customer to account for VAT to HMRC"

Step 2: Calculate CIS deduction

CIS deductions apply to labour only, not materials:

Labour element: £10,000
CIS rate: 20% (registered subcontractor)
CIS deduction: £10,000 x 20% = £2,000

Step 3: Calculate payment to subcontractor

Labour: £10,000
Less CIS deduction (20% of labour): -£2,000
Net labour payment: £8,000
Add materials (no CIS deducted): +£2,000
Total payment to subcontractor: £10,000

Step 4: Contractor's accounting entries

The contractor must:

Pay subcontractor: £10,000
Pay HMRC (CIS): £2,000 (by 22nd of following month)
VAT return Box 1: £2,400 (reverse charge VAT: £12,000 x 20%)
VAT return Box 4: £2,400 (input VAT recovery, if fully taxable)

Net VAT effect: Zero for fully taxable contractor (Box 1 = Box 4)

Step 5: Subcontractor's accounting entries

The subcontractor:

Receives: £10,000
Records CIS suffered: £2,000 (offset against tax liability)
VAT return Box 6: £12,000 (value of supplies)
No VAT in Box 1: Reverse charge means no output VAT collected

Contractor total outlay: £12,000 (subcontractor + HMRC)
Subcontractor receives: £10,000 (plus £2,000 tax credit)
HMRC receives (CIS): £2,000
HMRC receives (VAT): £0 net (reverse charge offset)

Common mistakes to avoid

Double taxation: Do NOT apply CIS to materials - only labour is subject to deductions
Charging VAT: If reverse charge applies, the subcontractor must NOT charge VAT
Missing annotation: Invoice must clearly state reverse charge applies
VAT timing: Contractor accounts for reverse charge VAT in the period invoice received
Partially exempt contractor: May not recover all input VAT - creates real cost

VAT domestic reverse charge for building and construction services

Make deductions and pay subcontractors (CIS)

Key points from the worked example

The example above shows several important interactions:

CIS only applies to labour - the 2,000 materials are paid in full, only the 10,000 labour element has the 20% CIS deduction
No VAT appears on the invoice - the reverse charge means the contractor handles VAT accounting, not the subcontractor
Contractor pays 12,000 total - 10,000 to subcontractor + 2,000 CIS to HMRC
VAT is neutral for most contractors - Box 1 equals Box 4 if fully taxable

How CIS relates to CITB levy

The CITB levy is a statutory training levy collected from construction employers. Your CIS payment data directly feeds into your CITB levy calculation, but at a higher rate than PAYE wages.

Understanding this connection helps you budget correctly and explains why using more subcontractors increases your CITB costs.

CITB levy calculation from CIS return data - worked example

How the CITB levy relates to CIS payments. The CITB levy is calculated from CIS return data, applying a different rate to subcontractor payments than to PAYE employees. This snippet explains the relationship and calculation.

The CITB levy is a statutory training levy collected from construction employers under the Industrial Training Act 1982. For businesses that engage CIS subcontractors, the levy applies at a higher rate to net CIS payments than to PAYE wages.

Key connection: Your CIS return data feeds directly into your CITB levy calculation. CITB uses your annual CIS payments to calculate part of your levy assessment.

CITB levy on PAYE employees: 0.35% of gross PAYE earnings
CITB levy on CIS subcontractors: 1.25% of net CIS payments (after CIS deductions)
Levy period: 6 April 2026 to 5 April 2029 (3 years)
Exemption threshold: Under £150,000 combined PAYE + net CIS = exempt
Small employer band: £150,000 to £500,000 = 50% reduction

Why CIS payments attract higher levy rate

The 1.25% rate on CIS payments (versus 0.35% on PAYE) reflects:

Subcontractors may not receive employer-funded training
Higher rate compensates for lack of direct training investment
Encourages contractors to invest in training or use trained subcontractors

Worked example: Mixed PAYE and CIS workforce

A construction contractor with:

Annual PAYE wages: £200,000 gross
Annual CIS payments (net, after deductions): £300,000
Combined total: £500,000 (above small employer threshold)

CITB levy calculation

PAYE element: £200,000 x 0.35% = £700
CIS element: £300,000 x 1.25% = £3,750
Total levy: £4,450
Any reduction: No - combined total exceeds £500,000
Final levy payable: £4,450

How CIS data flows to CITB

CIS monthly returns: You report payments to subcontractors to HMRC
Tax year end: HMRC shares aggregate CIS data with CITB (with employer consent)
CITB levy return: You confirm PAYE and CIS figures annually
Levy assessment: CITB issues assessment in spring following tax year

Who must register with CITB

You must register with CITB if you carry out construction activities as defined in the Levy Order, including:

Site preparation, demolition, earth moving
Building construction, alteration, repair
Civil engineering works
Installation (electrical, plumbing, heating)
Building completion (plastering, joinery, painting)
Plant hire with operator for construction

Important distinctions

CIS registration (HMRC): Determines tax deduction rates - separate from CITB
CITB registration: Required for all construction employers - not optional
Levy exemption: Based on wage bill threshold, not CIS registration status
Grant eligibility: Even exempt employers can claim CITB training grants

CITB levy, grants and funding

Construction Industry Scheme (CIS)

Why subcontractor payments cost more in CITB levy

The worked example shows that net CIS payments attract a levy rate of 1.25% compared to 0.35% for PAYE wages. This is because:

Subcontractors may not receive employer-funded training
The higher rate compensates CITB for this training gap
It incentivises contractors to invest in training or use trained subcontractors

Practical implication: When comparing the cost of using employees versus subcontractors, factor in the higher CITB levy rate on subcontractor payments.

CIS registration does NOT determine employment status

This is one of the most important - and most misunderstood - aspects of construction tax compliance. Being CIS-registered does not make someone self-employed.

CIS is purely a tax collection mechanism. A worker can be:

CIS-registered AND genuinely self-employed - correct treatment
CIS-registered AND actually an employee - compliance breach
Not CIS-registered AND an employee - use PAYE

Getting this wrong exposes you to:

Unpaid employer and employee National Insurance
Employment tribunal claims for holiday pay, unfair dismissal
Pension auto-enrolment failures
Interest and penalties from HMRC

CIS registration does not determine employment status - critical clarification

Critical clarification that CIS registration is separate from employment status. A worker can be CIS-registered AND still be an employee for tax purposes. This distinction has significant legal and financial implications for both parties and is a major compliance risk area.

Critical compliance point: Being registered under the Construction Industry Scheme (CIS) does NOT determine whether someone is employed or self-employed. CIS is purely a tax collection mechanism - it does not change the underlying employment relationship.

A worker can be:

CIS-registered AND genuinely self-employed - correct treatment
CIS-registered AND actually an employee - compliance breach
Not CIS-registered AND an employee - correct treatment (use PAYE)

CIS purpose: Tax collection mechanism for construction payments
CIS determines: Deduction rate (0%, 20%, 30%) based on registration status
CIS does NOT determine: Employment status (employee vs self-employed)
Employment status determines: NI liability, employment rights, PAYE obligations, IR35
Determining authority: Employment status tests in case law and HMRC guidance

The employment status tests

Employment status is determined by multiple factors, regardless of CIS registration:

Control: Does the engager control how, when, and where work is done?
Substitution: Can the worker send a substitute to do the work?
Mutuality of obligation: Is there ongoing obligation to offer/accept work?
Financial risk: Does the worker bear genuine business risk?
Equipment: Does the worker provide significant equipment/materials?
Integration: Is the worker integrated into the organisation?
Exclusivity: Is the worker restricted from working for others?

Warning signs of disguised employment

A CIS-registered worker may actually be an employee if:

Works exclusively or mainly for one contractor
Has set working hours dictated by contractor
Cannot send a substitute without contractor approval
Uses contractor's tools and equipment
Is supervised like other employees
Receives regular weekly/monthly payments regardless of work done
Has no genuine risk of loss on contracts

If worker is actually an employee: PAYE and NI must be operated - CIS is wrong treatment
Employer NI rate: 13.8% (plus Apprenticeship Levy if applicable)
Employee NI rate: 8% on earnings above threshold
Holiday pay entitlement: 5.6 weeks per year minimum
Wrongful CIS deduction: HMRC can recover unpaid NI from contractor

Risks of misclassification

For the contractor:

NI liability: HMRC can recover unpaid employer and employee NI
Interest and penalties: On underpaid tax and NI
Employment tribunal claims: Worker can claim employee rights retrospectively
Holiday pay claims: Potentially years of unpaid holiday accrued
Unfair dismissal: 2-year qualifying employees gain unfair dismissal rights
Pension auto-enrolment: Should have been enrolled in workplace pension

For the worker:

Loss of employment rights: If status challenged by contractor
No statutory sick pay: Self-employed have no SSP entitlement
No redundancy: No statutory redundancy payment if work ends

Using HMRC's Check Employment Status for Tax (CEST) tool

HMRC provides the CEST tool to help determine employment status. While not legally binding, HMRC will stand by CEST results if:

The information entered is accurate and complete
It reflects the actual working arrangement
The arrangement does not change after assessment

Check employment status for tax (CEST)

Understanding off-payroll working (IR35)

Best practice for contractors

Assess each engagement: Do not assume CIS registration means self-employment
Use CEST tool: Document status determination for each worker
Review contracts: Ensure contracts reflect actual working practices
Monitor arrangements: Status can change if working practices change
Keep records: Retain CEST results and status assessments
Take professional advice: For borderline cases, seek specialist advice

IR35 and CIS

The off-payroll working rules (IR35) apply when a worker provides services through an intermediary (usually their own limited company). If IR35 applies:

The end client (or agency) must assess status
If "inside IR35" - deemed employment, PAYE must be operated
CIS may still apply to the labour element of payments to the company
Both IR35 and CIS can apply simultaneously in construction

Worked example: All four obligations on one payment

Here is a complete example showing how CIS, VAT, CITB, and employment status checks all apply to a typical subcontractor payment.

Scenario

You are a main contractor paying a subcontractor for plastering work:

Labour charge: 5,000
Materials supplied by subcontractor: 500
Both parties are VAT-registered and CIS-registered
Subcontractor is registered (20% deduction rate)
Your annual CIS payments will total 300,000
You have verified the subcontractor's status

Step 1: Check employment status (before any payment)

Use HMRC's CEST tool to confirm the worker is genuinely self-employed, not an employee. Consider:

Can they send a substitute?
Do you control how they do the work?
Do they work for other contractors?

If actually employed: Stop - use PAYE, not CIS.

Step 2: Calculate CIS deduction

CIS applies to labour only: 5,000
Deduction at 20%: 5,000 x 20% = 1,000
Materials (no CIS): 500

Step 3: Apply VAT reverse charge

Both parties VAT and CIS registered - reverse charge applies
Invoice shows: 5,500 (no VAT)
Annotation: "Reverse charge: Customer to account for VAT to HMRC"

Step 4: Calculate payment to subcontractor

Gross invoice: 5,500
Less CIS on labour: -1,000
Pay subcontractor: 4,500

Step 5: Your accounting entries

Pay subcontractor: 4,500
Pay HMRC (CIS): 1,000 (by 22nd of following month)
VAT return Box 1: 1,100 (reverse charge: 5,500 x 20%)
VAT return Box 4: 1,100 (input VAT recovery)
Net VAT effect: Zero (if fully taxable)

Step 6: CITB levy impact

The net payment (after CIS deduction) counts towards your CITB levy:

Net CIS payment: 4,500
Added to your annual CIS total for levy calculation
At 1.25% rate: 4,500 x 1.25% = 56.25 annual levy impact

Summary: Your total cost for this 5,500 invoice

Payment to subcontractor: 4,500
CIS to HMRC: 1,000
VAT: 0 net (reverse charge offsets)
CITB levy contribution: 56.25
Total cost: 5,556.25

Common mistakes when these systems interact

CIS + VAT mistakes

Applying CIS to materials: Only labour is subject to CIS deductions - materials pass through at full value
Charging VAT when reverse charge applies: If both parties are CIS and VAT registered, no VAT should appear on the invoice
Applying CIS to VAT amount: CIS is always calculated on the net (pre-VAT) labour amount

CIS + PAYE mistakes

Assuming CIS registration = self-employed: Employment status is determined by the nature of the relationship, not CIS registration
Using CIS for regular workers: If someone works set hours, uses your tools, and cannot send a substitute, they may be an employee
Ignoring IR35: Limited company contractors may still be "inside IR35" requiring PAYE treatment

CITB mistakes

Forgetting CIS attracts higher levy: Budget for 1.25% on subcontractor payments, not 0.35%
Excluding CIS payments from levy return: CITB uses your CIS return data - your figures must match

Timeline: When each obligation triggers

Understanding the timing helps you stay compliant:

Before first payment to a subcontractor

Verify CIS status: Check with HMRC online service
Assess employment status: Use CEST tool, keep records
Confirm VAT status: Check if reverse charge applies
Get end user confirmation: If reverse charge may not apply, get written confirmation

When you make a payment

Deduct CIS: Calculate on labour element
Issue payment statement: Within 14 days of tax month end
Account for VAT: On your VAT return (reverse charge)

Monthly deadlines

CIS return: By 19th of following month
CIS payment: By 22nd if paying electronically

Annual deadlines

CITB levy return: Confirm PAYE and CIS figures
CITB levy payment: Per assessment (can be spread)

Checklist: Integrated construction tax compliance

Use this checklist for each new subcontractor relationship:

Before engaging the subcontractor

Verify their CIS registration status with HMRC
Assess employment status using CEST tool and document result
Check their VAT registration status
Determine if VAT reverse charge applies (both CIS registered, not end user)
If they claim end user status, get written confirmation

For each payment

Separate labour from materials on invoice
Apply correct CIS deduction rate to labour only
Check invoice shows reverse charge annotation (if applicable)
Issue payment and deduction statement

Monthly

Submit CIS return by 19th showing all payments and deductions
Pay CIS deductions to HMRC by 22nd
Include reverse charge VAT in your VAT return

Annually

Review employment status of regular subcontractors
Complete CITB levy return accurately
Pay CITB levy as assessed

CONSTRUCTION & PROPERTY Requirement

Be aware: CIS, VAT reverse charge, CITB, and PAYE each have slightly different scopes:

CIS: Construction operations as defined in Finance Act 2004
VAT reverse charge: Specified construction services reportable under CIS (with some exclusions)
CITB: Construction activities under Industrial Training Act 1982 (slightly different list)
PAYE/employment status: Based on nature of working relationship, not the type of work

A single worker relationship may require you to apply all four systems simultaneously. Check each obligation separately.

Related guides

Register as a CIS contractor - how to register with HMRC before making your first subcontractor payment
VAT reverse charge for construction - detailed guidance on when and how the reverse charge applies
Calculate CIS deductions - step-by-step guide to calculating the correct deduction amount
Submit your CIS monthly return - how to file your CIS300 return correctly
CIS registration does not determine employment status - why CIS does not make someone self-employed

Business Context Testing

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Construction tax compliance - how CIS, VAT, CITB, and PAYE work together

The four construction tax obligations

How CIS and VAT reverse charge interact

Key points from the worked example

How CIS relates to CITB levy

Why subcontractor payments cost more in CITB levy

CIS registration does NOT determine employment status

Worked example: All four obligations on one payment

Scenario

Step 1: Check employment status (before any payment)

Step 2: Calculate CIS deduction

Step 3: Apply VAT reverse charge

Step 4: Calculate payment to subcontractor

Step 5: Your accounting entries

Step 6: CITB levy impact

Summary: Your total cost for this 5,500 invoice

Common mistakes when these systems interact

CIS + VAT mistakes

CIS + PAYE mistakes

CITB mistakes

Timeline: When each obligation triggers

Before first payment to a subcontractor

When you make a payment

Monthly deadlines

Annual deadlines

Checklist: Integrated construction tax compliance

Before engaging the subcontractor

For each payment

Monthly

Annually

All four systems use different definitions

Related guides

Compliance Assistant

🧪 Business Context Testing

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The four construction tax obligations

How CIS and VAT reverse charge interact

Key points from the worked example

How CIS relates to CITB levy

Why subcontractor payments cost more in CITB levy

CIS registration does NOT determine employment status

Worked example: All four obligations on one payment

Scenario

Step 1: Check employment status (before any payment)

Step 2: Calculate CIS deduction

Step 3: Apply VAT reverse charge

Step 4: Calculate payment to subcontractor

Step 5: Your accounting entries

Step 6: CITB levy impact

Summary: Your total cost for this 5,500 invoice

Common mistakes when these systems interact

CIS + VAT mistakes

CIS + PAYE mistakes

CITB mistakes

Timeline: When each obligation triggers

Before first payment to a subcontractor

When you make a payment

Monthly deadlines

Annual deadlines

Checklist: Integrated construction tax compliance

Before engaging the subcontractor

For each payment

Monthly

Annually

All four systems use different definitions

Related guides

Related guides in VAT

Business Context Testing

Content Graph