CIS Calculator UK

The Construction Industry Scheme (CIS) is a system used by HMRC where contractors deduct money from subcontractors’ payments and pass it directly to HMRC as advance tax.

CIS deductions usually apply to:

• Construction work
• Repairs and maintenance
• Site labour and subcontracting

CIS Deduction Rates UK

The standard CIS rates are:

• 20% – Registered subcontractors
• 30% – Unregistered subcontractors
• 0% – Gross payment status (no deductions)

How to Use the CIS Calculator UK

Using the calculator is simple:

1. Enter your invoice amount
2. Select your CIS status (registered or unregistered)
3. Choose the deduction rate (20% or 30%)
4. Click calculate

You’ll instantly see:

• CIS deduction amount
• Net payment after tax
• Total payable by contractor

How CIS Is Calculated

Step 1: Identify Invoice Amount

Total amount before deductions

Step 2: Apply CIS Rate

• 20% or 30% depending on registration

Step 3: Calculate Net Pay

Net pay = Invoice – CIS deduction

Example Calculation

If your invoice is £1,000:

Registered subcontractor (20%):

• CIS deduction = £200
• Net payment = £800

Unregistered subcontractor (30%):

• CIS deduction = £300
• Net payment = £700

Why Use Our CIS Calculator UK?

Instant CIS deduction calculations
Works for contractors and subcontractors
Helps avoid payroll errors
Saves time on manual calculations
Ideal for construction businesses

Who Should Use This Tool?

This calculator is perfect for:

• Construction contractors
• Subcontractors
• Freelance tradespeople
• Builders and electricians
• Accounting professionals

What CIS Covers

CIS applies to:

• Building work
• Renovations and repairs
• Demolition work
• Site preparation
• Installation work

Gross Payment Status

If you have gross payment status, you:

• Do NOT have CIS deducted
• Receive full payment
• Pay tax later via Self Assessment

Common CIS Mistakes

• Using wrong deduction rate
• Forgetting CIS registration status
• Not recording CIS deductions properly
• Miscalculating invoice totals

Our CIS Calculator UK helps avoid these issues.

CIS Tax Tips

• Always check your CIS status
• Keep accurate invoice records
• Reconcile deductions monthly
• Claim CIS refunds if over-deducted

Stay Compliant with HMRC

Using the CIS system correctly helps you:

• Stay compliant with tax rules
• Avoid penalties
• Manage cash flow better
• Track construction income accurately

Start Using the CIS Calculator UK

Use our free CIS Calculator UK above to quickly calculate your CIS deductions and manage your construction payments with confidence.

FAQs – CIS Calculator UK

What is CIS tax in the UK?

It is a tax deduction system for construction work where tax is taken from subcontractor payments.

What is the CIS deduction rate?

20% for registered subcontractors and 30% for unregistered subcontractors.

Do I get CIS tax back?

Yes, if you overpay tax, you may get a refund via Self Assessment.

Who pays CIS tax?

Contractors deduct CIS tax and send it to HMRC on behalf of subcontractors.

Is this calculator accurate?

Yes, it provides reliable estimates based on current CIS rules.