Your First UK Self-Employed Invoice 2026: Template + What to Include

You've registered as self-employed and landed your first paying client. Now you need to invoice them. Done badly, your invoice gets paid late (or not at all) and creates problems for your year-end Self Assessment. Done well, it gets paid on time and creates a clean audit trail. This guide covers the must-haves for UK self-employed invoices in 2026.

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What a UK invoice MUST contain

For a basic non-VAT invoice (most freelancers / sole traders starting out), HMRC requires:

The word "Invoice" clearly displayed.
Your business name + trading name if you have one.
Your address (where you trade from - home address is fine for sole traders).
A unique invoice number in sequential order.
The invoice date (when you issued it).
The customer's name + address.
A description of services / goods delivered.
The amount being charged (clearly broken down per item if multiple lines).
The total payable.
Payment terms (e.g. "Net 30 days" or "Due on receipt").
Your bank details for payment.

For a VAT-registered business, additional requirements apply (see VAT section below).

A free UK invoice template

A clean invoice for a non-VAT-registered sole trader looks like this:

─────────────────────────────────────────────────────
INVOICE
─────────────────────────────────────────────────────

From:                         To:
Jane Smith Photography        Acme Marketing Ltd
12 High Street                45 Queen Street
London, NW1 2AB               Manchester, M1 4FP
Tel: 07700 900123
Email: jane@janesmith.co.uk

Invoice number:    JS-2026-001
Invoice date:      15 May 2026
Payment due:       14 June 2026 (Net 30)
─────────────────────────────────────────────────────

Description                              Amount
─────────────────────────────────────────────────────
Product photography for Q2 campaign      
(45 product shots, full editing)         £1,800.00
─────────────────────────────────────────────────────
TOTAL DUE                                £1,800.00
─────────────────────────────────────────────────────

Payment by bank transfer to:
Account name:   Jane Smith
Sort code:      04-00-04
Account number: 12345678
Reference:      JS-2026-001

Late payment will be subject to interest at 8% above
the Bank of England base rate, plus a £40 fixed fee
under the Late Payment of Commercial Debts (Interest)
Act 1998.

Thank you for your business.
─────────────────────────────────────────────────────

Your invoice numbering system

Every invoice needs a unique sequential number. HMRC may audit this in a Self Assessment enquiry - gaps in your sequence raise questions.

Common approaches:

Sequential: 0001, 0002, 0003... simple and clean.
Year-based: 2026-001, 2026-002... easier to find at year-end.
Initials + year: JS-2026-001 (Jane Smith, 2026, first invoice). My recommendation.

Whatever you choose, never go backwards. Don't issue an invoice today numbered 010 then issue one tomorrow numbered 008. Always increment.

Payment terms - what to put

Standard UK payment terms:

Net 30 (most common for B2B): payment due 30 days after invoice date.
Net 14 or Net 7: faster payment for service businesses.
Due on receipt: payment expected immediately.
Net 60: sometimes used by larger corporates (push back if you can - 60 days hurts your cashflow).

Specify calendar days or business days explicitly to avoid ambiguity.

VAT - when and how to add it

You must register for VAT once your annual taxable turnover exceeds £90,000 (the 2026/27 threshold). You can voluntarily register below that.

For a VAT-registered business, your invoice must additionally show:

Your VAT number (e.g. GB 123 4567 89).
VAT rate applied to each line (typically 20% standard, 5% reduced, 0% zero-rated).
VAT amount per line + total VAT.
Total invoice amount including VAT.

Example VAT line on invoice:

Photography services         £1,500.00
VAT at 20%                     £300.00
─────────────────────────────────────
TOTAL DUE                    £1,800.00

If you're not VAT-registered, DO NOT charge VAT on your invoice. Charging VAT when you're not registered is a criminal offence (HMRC sees it as fraud).

Late payment rights - your statutory protections

Under the Late Payment of Commercial Debts (Interest) Act 1998, you have automatic statutory rights against late-paying B2B customers:

Statutory interest: 8% above the Bank of England base rate (currently around 12.5% total in 2026).
Fixed admin fee: £40 for invoices under £1,000, £70 for £1,000-£9,999, £100 for £10,000+.
Reasonable recovery costs: any third-party debt collection fees.

These rights are automatic - you don't need to mention them in your contract or invoice. But citing them on the invoice (as in the template above) discourages late payment.

These rights apply only to B2B transactions. Consumer customers (B2C) have different (weaker) late-payment protections.

Recordkeeping requirements

You must keep all invoices for at least 6 years (HMRC's audit window). For VAT-registered businesses, that becomes 6 years from the end of the tax year.

Best practice:

Issue invoices in PDF, not Word - Word documents can be edited later, raising audit questions.
Save in a numbered folder structure: 2026/Q2/ for example.
Cloud-backup (Google Drive, Dropbox, OneDrive) - losing invoice records during HMRC enquiry is bad.
Spreadsheet log of every invoice + payment status.

Tracking what's paid

A simple tracker spreadsheet:

Invoice #    Date       Customer       Net    VAT   Total   Paid Date  Status
JS-2026-001  15 May 26  Acme Mktg     1800   0     1800    20 Jun 26  Paid
JS-2026-002  18 May 26  Bright Co     2400   0     2400               Pending
JS-2026-003  22 May 26  Quik Print    600    0     600     30 May 26  Paid

This gives you instant visibility on outstanding receivables + cashflow.

Handling non-payment

If an invoice goes 14+ days past due:

Day 14 past due: friendly email reminder. Quote the invoice number + amount + due date.
Day 21 past due: phone call to the AP team or your contact.
Day 30 past due: formal "letter before action" (LBA) citing the Late Payment of Commercial Debts Act, statutory interest accruing, and your intention to escalate.
Day 45 past due: small claims court or use a debt collection service.

For substantial unpaid invoices (over £10,000), consider talking to a commercial litigation solicitor before escalating.

Free invoicing tools (no need to spend on software year 1)

Wave (waveapps.com) - free invoicing + accounting.
Zoho Invoice (zoho.com/invoice) - free for under 5 customers.
Microsoft Office templates - Word/Excel templates work fine.
Google Docs templates - free + cloud-saved automatically.

Once you're earning more than £30,000/year self-employed, consider paid software like FreeAgent, QuickBooks, or Xero for cleaner Self Assessment prep.

What HMRC sees

HMRC doesn't see your invoices directly - they see your annual Self Assessment return showing total turnover. But if HMRC opens an enquiry, they can request all your invoices for the period. Bad invoice records (gaps, missing customer details, unclear amounts) trigger more questions and longer enquiries.

Disclaimer

PayslipIQ provides automated educational guidance based on the figures you supply. It is not regulated tax or accounting advice. Invoicing rules interact with VAT registration, IR35 (off-payroll working), and the Late Payment of Commercial Debts Act. For substantial issues with non-paying customers or VAT registration timing, use an ICAEW/ACCA-registered accountant or commercial solicitor.