A valid invoice needs the word "Invoice", a unique number, issue and due dates, your details, the customer’s details, itemised charges, totals, tax and payment terms.
If you charge VAT or sales tax, extra rules apply: in the UK and UAE, a VAT invoice must show your VAT number (TRN in the UAE) and the tax amount.
Clear due dates, several payment options and a polite late-payment clause are the simplest ways to get paid on time.
A good invoice does two jobs: it gives your customer everything they need to approve and pay, and it gives you and the tax office a clear record of the sale. Miss a detail and the invoice sits in someone’s inbox waiting for a question to be answered. Here are the 12 details to include, a sample layout and the habits that get invoices paid faster.
Free tool
Create a clean, professional invoice in your browser and download it as a PDF. Open the Invoice Generator.
The 12 things every invoice should include
The word "Invoice" clearly at the top (or "Tax Invoice" where VAT rules require it).
A unique invoice number, in sequence (for example INV-2026-0142). Never reuse one.
Issue date: the date you send the invoice.
Supply date: when the work was done or goods delivered, if different.
Due date: a real calendar date, not only "Net 30".
Your details: business or trading name, address, email and phone. Add your company registration number if you are a limited company.
Customer details: their business name, contact person and address. Add their PO number if they gave you one; many finance teams cannot pay without it.
Itemised description of each product or service: what, how many, and the unit price.
Subtotal before tax and discounts.
Tax: rate and amount for each line, and your tax registration number if you are registered.
Total amount due, with the currency.
Payment terms and methods: bank details, payment link or card option, and any late-payment terms.
Sample invoice layout
Description
Qty
Unit price
Amount
Website copywriting: 5 product pages
5
$180.00
$900.00
SEO title and meta descriptions
5
$40.00
$200.00
Revision round (hours)
2
$60.00
$120.00
Subtotal
$1,220.00
Tax (example 5%)
$61.00
Total due by 25 Nov 2026
$1,281.00
Above the table sit your logo, your details, the customer’s details, the invoice number and the dates. Below it go payment instructions and a short thank-you line. You can build exactly this in the free invoice generator.
Extra details for VAT and sales tax invoices
UK: a VAT invoice must also show your VAT registration number, the time of supply, the VAT rate per item and the total VAT charged.
UAE: a full tax invoice should say "Tax Invoice", show your Tax Registration Number (TRN) and, for most B2B sales, the customer’s TRN, plus the VAT amount in AED.
US: there is no federal VAT. Show state and local sales tax where you collect it, and keep invoices as records that support the income on your tax return.
EU: cross-border B2B invoices often need both VAT numbers and a reverse-charge note.
Rules change and vary by country, so check your tax authority’s current guidance or ask an accountant before you rely on a template.
Payment terms that get you paid faster
Shorter terms. Net 14 is paid faster than Net 30, and "due on receipt" works well for small one-off jobs.
A specific date. "Due 25 November 2026" is harder to overlook than "Net 30".
Several ways to pay. Bank transfer details plus a card or payment link removes excuses.
Deposits on big projects. 30% to 50% upfront protects your cash if a client disappears.
A late-payment clause agreed in your contract and repeated on the invoice.
Vague descriptions like "services rendered", which trigger questions and delays.
Sending to a general inbox instead of the person or accounts team who approves payment.
Missing the customer’s PO number.
Duplicate or skipped invoice numbers, which make your books hard to reconcile.
Not following up. Send a polite reminder the day after the due date, then at 7 and 14 days.
Invoicing as a freelancer
Freelancers often under-charge on the invoice before it is even sent. Make sure your rate covers tax, unpaid admin time and holidays; our freelance rate guide and freelance hourly rate calculator help you set it. If you bill hourly, list dates and hours per task. Clients pay detailed invoices faster because they can see what they bought.
FAQ
Does an invoice need an invoice number?
Yes. A unique, sequential number makes each invoice traceable for you, your customer and the tax authority. In the UK it is a legal requirement for every invoice.
What payment terms should I put on an invoice?
State a specific date ("Due 25 November 2026") rather than only "Net 30". Common terms are due on receipt, Net 14 and Net 30. Shorter terms usually mean faster payment.
Is an invoice the same as a receipt?
No. An invoice asks for payment. A receipt confirms payment has been received.
Can I add a late fee to an invoice?
Usually, if it was agreed in advance and is stated in your terms. In the UK, businesses can claim statutory interest and fixed compensation on late commercial payments. Check local rules before adding one.