Invoice Template for Contractors UK: Free Guide & Examples

Contractor Invoicing in the UK

As a contractor in the UK — whether you're in construction, IT, consulting, or trades — your invoice is your most important business document. It's how you get paid, track your income, and stay compliant with HMRC. This guide covers everything you need to know about contractor invoices.

What Makes a Contractor Invoice Different?

Contractor invoices often include additional details that standard freelance invoices don't need:

• Purchase Order (PO) numbers — Many agencies and companies require a PO reference
• Timesheet references — Linking to approved timesheets for hourly/daily rate work
• CIS deduction details — For construction industry contractors
• Contract/engagement reference — Identifying which contract the work relates to
• IR35 status — Some clients require confirmation of IR35 determination

Essential Fields for a Contractor Invoice

• Your company name (limited company) or trading name (sole trader)
• Your registered office address
• Company registration number (if limited)
• VAT number (if registered)
• Client company name and address
• Unique sequential invoice number
• Invoice date and tax point
• Description of work (with dates/hours)
• Daily/hourly rate and total hours/days worked
• Subtotal, VAT, and grand total
• Payment terms (typically Net 30 for contractors)
• Bank details for BACS payment

CIS Invoices for Construction Contractors

If you work in construction and are registered under the Construction Industry Scheme (CIS), your invoices need special treatment. The contractor paying you will deduct CIS tax (usually 20%) before paying. Your invoice should show:

• Gross amount (before CIS deduction)
• CIS deduction amount (20% or 30%)
• Net payment amount (what you'll actually receive)
• Your UTR (Unique Taxpayer Reference) number
• A note stating "CIS deduction applies"

Payment Terms for Contractors

Standard payment terms for UK contractors:

• Net 7 — Common for small/direct clients
• Net 14 — Standard for recruitment agencies
• Net 30 — Standard for larger companies and end clients
• End of month + 30 — Some corporate clients pay on monthly cycles

Under the Late Payment of Commercial Debts Act, you have the legal right to charge interest on overdue invoices at 8% above the Bank of England base rate.

Tips for Getting Paid Faster as a Contractor

• Submit invoices on the same day each week/month
• Always include the PO number — invoices without it get rejected
• Email invoices to the accounts payable team, not just your manager
• Follow up politely after 7 days if payment terms are Net 14
• Keep a spreadsheet tracking invoice dates and expected payment dates

Create professional contractor invoices instantly with InvoiceForged. Our Contractor template is specifically designed for UK contractors with fields for PO numbers, timesheet references, and CIS deductions. Start free — 3 invoices per week.