An invoice is a request for payment: it tells your customer what you supplied, how much they owe, and how and when to pay. A clear invoice gets paid faster and protects you if there is ever a dispute. Whether you are a freelancer, a shopkeeper or a small company, this guide covers what to put on it and the mistakes that slow down payment.
What a professional invoice includes
| Section | What to include |
|---|---|
| Heading | The word “Invoice” (or “Tax Invoice” if you are registered for sales tax or VAT and the law requires it). |
| Your details | Business name, logo, address, phone, email and, if registered, your NTN and sales tax number (STRN), or VAT number. |
| Customer details | Customer or company name, address and, for business customers, their tax number if required. |
| Invoice number | A unique, sequential number such as INV-0042. Never reuse or skip numbers. |
| Dates | The invoice date and the due date (for example 15 or 30 days later). |
| Items | A line for each product or service: description, quantity, unit price and line total. |
| Totals | Subtotal, any discount, delivery charges, tax (name and rate), and the grand total. |
| Amount in words | Common in Pakistan and the Gulf, e.g. “Rupees Fifty Thousand Only”; it prevents altering figures. |
| Payment details | Bank name, account title, IBAN, or JazzCash / Easypaisa / Raast details. |
| Terms and notes | Payment terms, late payment terms, warranty or return policy, and a thank-you note. |
Step by step
- Agree the price first, ideally with a written quotation, so the invoice holds no surprises.
- Give the invoice the next number in your series and date it on the day you deliver or finish the work.
- List items clearly. "Website design: 5 pages" is better than "Services". The customer's accounts team needs to match it with what they ordered.
- Add tax correctly. Tax is normally calculated after discount. Use the correct rate for what you sell and where.
- Check the total and the amount in words, then send it as a PDF, which can't be edited easily and looks professional.
- Record it. Keep a copy, and when you are paid, issue a receipt.
Mistakes that delay payment
- No due date, so the customer pays "whenever".
- Missing bank details, or details that don't match the account title.
- No purchase order (PO) number, when the customer gave you one. Large companies often can't pay without it.
- Unclear descriptions that need a phone call to explain.
- Sending it as an editable Word file or a photo of a handwritten bill.
Invoice, bill or receipt?
An invoice asks for payment; a receipt confirms payment was received. "Bill" is the everyday word, mostly used for an invoice. For the full set of documents, see quotation, proforma, invoice, challan and receipt explained.
The invoice generator runs in your browser: add your logo, items, discount, sales tax and bank details, choose a template, and download a PDF or image. Nothing you type is uploaded.