invoice number

Meaning

A unique, sequential number assigned to an invoice to help both the buyer and seller track payments and reference the transaction. It is crucial for bookkeeping and resolving billing issues.

Examples

• Could you please quote the invoice number when you make the bank transfer?

  Could you please quote the invoice number when you make the bank transfer?

• I cannot find the payment because you forgot to write the invoice number.

  I cannot find the payment because you forgot to write the invoice number.

• Please update the invoice number to INV-2026-004.

  Please update the invoice number to INV-2026-004.

• The client is asking for the invoice number of their last purchase.

  The client is asking for the invoice number of their last purchase.

• Each invoice number must be unique to avoid confusion in our database.

  Each invoice number must be unique to avoid confusion in our database.

Common Mistakes

• ✗ What is the bill code?

  ✓ What is the invoice number?

  In professional B2B (business-to-business) transactions, 'invoice number' is the standard term, not 'bill code' or 'bill number'.

• ✗ The invoice number is wrote at the top.

  ✓ The invoice number is written at the top.

  Use the past participle 'written' with the passive voice construction.

Related Expressions

Practice

• Please include the ___ in the subject line of your email.

  💡 The unique tracking digits on a bill.

  Show answer

  invoice number

• The accounting system automatically generates a unique ___ for every sale.

  💡 The identification code for a specific bill.

  Show answer

  invoice number