Five invoice mistakes small businesses make every week

'Consulting work', 'Design services', 'Project Q3' — these are the most-disputed line items in B2B invoicing. The buyer's accounts team cannot match them to a purchase order, the project lead cannot remember what they refer to, and the invoice sits in approval limbo for weeks.

The fix is to write each line as a specific deliverable: 'Brand identity design — logo and type system (Phase 1 of 2)'. It takes ten extra seconds per line and clears the most common reason for slow payment.

Invoices issued without a due date default to 30 days in most jurisdictions, or worse, to 'on demand' — neither of which is a strong recovery position. Invoices with the wrong due date (e.g. issued today, due yesterday) cause confusion at the buyer and frequently get sent back.

Always set an explicit due date in the future. If you operate in multiple countries, default to the longer term unless you know the local norm.

An invoice that shows only a final total, with tax 'included', causes problems on both sides. The buyer's accounts team has to back-calculate the tax to apply the correct deduction. The seller has weak documentation in a tax audit.

Show subtotal, tax (with rate), and total separately. Always.

Payment details on page 3 of a multi-page invoice are read by almost no one. The buyer skims the line items, sees the total, and either pays or files. Putting payment instructions at the bottom of page 3 is the same as not putting them at all.

Move payment details to a clearly labeled block on page 1. Lead with your preferred method.

Most overdue invoices are not malicious — they are forgotten. A simple four-step reminder cadence (day 0, day +3, day +10, day +21) recovers most overdue invoices with the relationship intact. Doing nothing leaves recovery to chance.