What is an itemised invoice?

What an itemised invoice shows

Each line names one thing, how many of it, the price per unit and the line amount. Tax can sit in its own column or as one GST line under the subtotal, as long as the customer can see what tax applies to what. Under the lines come the subtotal, any discount, the tax, the total and the amount due if a deposit has already been paid. The ATO says a tax invoice must give a brief description of the items sold, including the quantity where applicable and the price, and show the extent to which each sale on the invoice is a taxable sale. Itemising is the natural way to meet that rule when one invoice mixes taxable and GST free items.

Itemised against summary invoices

A summary invoice states one total for the job, perhaps with a short description. It is fine when the client agreed a fixed price and only needs a document to pay against. An itemised invoice suits work billed by time and materials, jobs with allowances or variations, and clients who must code costs to different accounts. Many businesses use a middle path: group the lines under headings such as labour, materials and allowances, so a long job does not produce a two page invoice but every charge can still be traced.

When itemising matters most

Itemise when the price changed from the quote, because the lines show where it changed. Itemise when a client will claim part of the cost from someone else, such as an insurer or a landlord. Itemise when some items are GST free, such as certain basic foods, so the GST line is correct. And itemise when a client is likely to query the bill, because a clear breakdown answers most questions before they are asked. In the UK, HMRC sets out what a full VAT invoice must show, including a description and quantity of goods or services and the rate of VAT.

Common mistakes

Lines that are too vague, such as Materials, $1,200, invite the same questions a summary would. Lines that are too detailed, listing every screw, hide the large items. Quantities with no unit, such as 12 with no hours or metres, cause confusion. Tax shown only as a total when some lines are GST free makes the invoice look wrong. And totals that do not add up to the cent, usually from rounding each line differently, undermine trust in the whole document.

Where it shows up in the product

The pricing table in the proposals module is itemised by design. Its columns are Item, Qty, Unit price, Tax, Discount and Amount, Qty can be hidden, and Tax and Discount appear only when an item has a rate and the toggle is on. Under the lines sit Subtotal, Discount, the tax line, Total, then Deposit due now and Balance when there is a deposit. Each item can carry a unit label and a group label, and Create invoice converts an accepted proposal's items into an invoice.

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