New business owners in the UAE often use "quotation", "proforma" and "invoice" as if they were the same thing. They are not. Each has a different purpose, and only one of them is a tax document you can use to charge and claim VAT. Mixing them up can create awkward conversations with customers, auditors and the Federal Tax Authority (FTA). This guide explains each document in plain language. It is general information, not tax advice; check the current FTA rules or ask your accountant for your case.

1. Quotation (or estimate)

A quotation is an offer. It tells the customer what you will supply, at what price, on what terms and for how long the offer is valid. It does not create a debt, and it is not a tax document. A good quotation shows your company details, the customer's details, a clear description of each item, quantities, unit prices, whether prices include or exclude 5% VAT, delivery or payment terms, and the validity date. Number your quotations and keep a copy: many disputes start with "that is not what you quoted".

2. Proforma invoice

A proforma invoice is a preliminary bill, used when the customer needs a document before paying or before goods ship: to arrange a bank transfer, open a letter of credit, clear customs or approve an internal budget. It looks like an invoice but it is not a tax invoice, and it should be clearly marked "Proforma". Payment against a proforma normally leads to the real tax invoice. Do not let a proforma stand in for a tax invoice, and do not let the customer claim input VAT on it.

3. Tax invoice

A tax invoice is the document that records a taxable supply and the VAT charged on it. A VAT-registered business must issue one for taxable supplies, and the customer uses it to recover input VAT. The UAE VAT rules list the details it must contain. In summary these include the words "Tax Invoice", your name, address and tax registration number, the customer's details where required, a unique invoice number, the date, a description of the goods or services, the quantity, unit price, the tax rate and the tax amount in dirhams, and the total payable. The rules allow simplified tax invoices in some cases, and special rules apply to some supplies. Always check the current FTA guidance. Our tax invoice checklist and VAT guide for small businesses go through the details.

4. Credit note and debit note

If you must correct a tax invoice after issuing it, for a return, a discount or an error, you issue a tax credit note (to reduce) or a tax debit note (to increase), referring to the original invoice. Never edit or delete an issued invoice quietly. This keeps your VAT return consistent with what the customer recorded.

5. Receipt

A receipt proves that money was received. It may be issued in addition to the tax invoice, showing the date, amount, method and the invoice it settles. In small retail sales the tax invoice and receipt are often one document.

A simple flow

  1. Send a quotation to win the work.
  2. If the customer needs it to pay in advance, send a proforma invoice.
  3. When you supply the goods or services (or receive payment, depending on the rules), issue a tax invoice.
  4. Record the payment and issue a receipt.
  5. If something changes, issue a credit note.

How software helps

Common mistakes we see

  • Sending a proforma to a VAT-registered customer who then books it as a purchase invoice.
  • Issuing invoices without a tax registration number because the quotation template was reused.
  • Changing an issued invoice in the spreadsheet instead of raising a credit note.
  • Numbering gaps because drafts were deleted without a record.
  • Quoting prices without saying whether VAT is included, then losing 5% of the margin.

A short internal rule helps: "Quotation to win, proforma to pay in advance, tax invoice to supply, credit note to correct." Print it and put it near the accounts desk.

A billing system should create each document from the one before, keep numbering in sequence, lock an invoice once issued, show 5% VAT correctly and let you email a copy. That is how our own ERP and CRM systems handle quotations and invoices. See also how to write a professional quotation.