Do self-employed people need to send invoices?

There is no legal requirement for non-VAT-registered self-employed people to issue invoices. However, invoices are essential for professional credibility, record-keeping, and getting paid on time. They create a clear paper trail for your self-assessment tax return and make it much easier for clients to process your payment.

What must be on a UK invoice?

A UK invoice should include: your name or business name, your address, client name and address, a unique invoice number, the invoice date, a description of goods or services provided, the amount due, payment terms, and your payment details (bank account or PayPal). If you are VAT registered, you must also include your VAT number, the VAT rate, and the VAT amount.

Do I need to put my address on an invoice?

If you are VAT registered, yes — your address is a legal requirement on VAT invoices. If you are not VAT registered, it is not legally required but is considered best practice and many clients expect it. You can use a PO Box or registered business address if you work from home and prefer not to share your home address.

What is the difference between a quote and an invoice?

A quote is sent before work begins and estimates the cost. An invoice is sent after work is completed (or at agreed milestones) and requests payment for work done. A quote becomes a basis for the invoice, but the final invoice may differ if the scope changed.

Should I charge VAT on my invoices?

Only if you are VAT registered. You must register for VAT if your taxable turnover exceeds £90,000 in any 12-month period (2025/26 threshold). If you are not VAT registered, do not add VAT to your invoices. You can voluntarily register below the threshold, but this is only beneficial if most of your clients are VAT-registered businesses.

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How to Write an Invoice (Self-Employed UK): What to Include + Free Template

Published: 2026-03-09 · For UK freelancers, sole traders, and self-employed

Writing your first invoice can feel awkward — especially if you've never done it before. What do you actually need to include? Is there a legal format? What if you're not VAT registered?

Good news: invoicing is simpler than it looks. This guide covers everything, with a real example and a checklist you can follow every time.

What must be on your invoice

✅ Every UK invoice should include:

Your name (or business name)
Your contact details (address, email, phone)
Client's name and address
A unique invoice number
The invoice date
A clear description of what you provided
The amount due (with currency)
Payment terms (when it's due)
Your payment details (bank account, sort code, or PayPal)

If you're VAT registered, you must also include:

Your VAT registration number
The VAT rate applied
The VAT amount
The total including VAT

Example invoice

Bill to:
TechStart Ltd
Suite 200, Innovation House
London EC2A 1NT
[email protected]

Description	Qty	Rate	Amount
Website copy — homepage, about page, services page	3 pages	£250.00	£750.00
Blog post — "Getting Started with AI" (1,200 words)	1	£180.00	£180.00
Revision round (homepage amendments per client feedback)	1	£75.00	£75.00
Total due			£1,005.00

Payment details:
Bank: Starling Bank
Account name: Jane Smith
Sort code: 60-83-71
Account number: 12345678
Reference: JS-2026-003

Not VAT registered. Payment due within 30 days. Late payments may incur statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998.

Step-by-step: writing your invoice

1. Choose an invoice number system

Your invoice numbers must be unique and sequential. Common formats:

Simple sequential: 001, 002, 003...
Year-based: 2026-001, 2026-002...
Initials + year: JS-2026-001
Client-based: TECH-001, TECH-002...

💡 Tip: Don't start at 001 if you'd rather not advertise that you're brand new. Starting at 100 or 1001 is perfectly fine and common practice.

2. Add your details

Include your full name (or registered business name), address, email, and phone number. This tells the client exactly who they're paying.

If you work from home and don't want to share your home address, consider a PO Box or virtual office address.

3. Add the client's details

Their company name, address, and a contact email. If they have a specific "accounts" or "finance" email, use that — it speeds up payment processing.

4. Describe what you did

Be specific. "Copywriting services" is vague. "Website copy — homepage, about page, services page (3 pages × £250)" is clear and hard to dispute.

Good descriptions include:

What you delivered
Quantity (hours, pages, items, days)
The rate per unit
The line total

5. Set clear payment terms

State when the invoice is due. Common terms:

Due on receipt — payment expected immediately
Net 14 — due within 14 days
Net 30 — due within 30 days (most common)
Net 60 — due within 60 days (avoid if you can)

Include the actual due date, not just "Net 30." Writing "Due: 8 April 2026" removes any ambiguity.

6. Add your payment details

Make it as easy as possible for them to pay you:

Bank transfer: sort code, account number, account name, payment reference
PayPal: your PayPal email
Stripe/card link: include a payment URL if you have one

💡 Pro tip: Always include a payment reference (usually the invoice number). This makes reconciliation much easier when you're doing your self-assessment.

7. Add a late payment notice (optional but recommended)

A simple line at the bottom referencing the Late Payment of Commercial Debts (Interest) Act 1998 reminds clients that late payment has consequences. You don't need to threaten — just state the fact.

Example: "Late payments may incur statutory interest at 8% + Bank of England base rate, plus fixed compensation of £40-£100 under the Late Payment of Commercial Debts (Interest) Act 1998."

Common invoicing mistakes

No invoice number — makes it impossible to reference later and fails HMRC record-keeping requirements
Vague descriptions — "services rendered" invites disputes. Be specific.
No due date — if you don't say when it's due, the client decides
Missing payment details — every extra step for the client delays payment
Adding VAT when not registered — you cannot charge VAT unless you have a VAT registration number
Inconsistent formatting — professional, consistent invoices get paid faster
Sending to the wrong person — always confirm who handles payments

Do you need invoicing software?

Not necessarily. You can create invoices using:

Word/Google Docs — fine for low volume, but manual
Excel/Google Sheets — good for tracking, but formatting is fiddly
Free tools — our free invoice generator creates professional invoices instantly
Accounting software — FreeAgent, Xero, QuickBooks (from ~£12/month) — best if you send 10+ invoices per month

Start simple. Don't pay for software until your invoicing volume justifies it.

What about recurring invoices?

If you invoice the same client monthly for the same amount (retainer, subscription, ongoing work), set up a template and change only the date and invoice number each month.

Better yet, use a tool that generates recurring invoices automatically. Most accounting software can do this.

When to send your invoice

The sooner you invoice, the sooner you get paid. Best practices:

On completion — send the invoice the same day you deliver the work
At milestones — for larger projects, invoice at each agreed stage
Monthly — for ongoing work, invoice at the start of each month for the previous month's work
Upfront — for new clients or high-value projects, ask for a deposit invoice before starting

⚠️ Don't wait. Every week you delay sending an invoice adds a week to your payment timeline. Freelancers who invoice on the same day they deliver get paid an average of 2 weeks faster.

Keeping records

HMRC requires you to keep copies of all invoices for at least 5 years after the relevant tax year. Keep:

A copy of every invoice (PDF or digital)
A log of invoice numbers, amounts, dates, and payment status
Records of any credit notes or adjustments

A simple spreadsheet works. Or use our free client and project tracker to log everything in one place.

Related guides

Free Invoice Generator — create and download a professional invoice now
Free Invoice Templates (UK) — 3 styles, VAT toggle, PDF download
How to Chase Unpaid Invoices (Email Templates)
Freelance Payment Terms: What to Put in Your Contract
Late Payment Interest Calculator
Free Client & Project Tracker

📧 12 Ready-Made Invoice Email Templates

Stop writing chase emails from scratch. The Invoice Email Pack gives you 12 professionally written templates — from friendly first reminders to firm final notices — ready to copy, paste, and send.

Get the Invoice Email Pack — £7 →

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