A small-supplier invoice should identify the buyer and order reference, list each product with the billed quantity, unit and price, and state the amount due. Keep purchase orders and delivery notes separate: the purchase order records the buyer's order, while the delivery note records stated delivery quantities rather than payment.
In this example
Start with the buyer and order reference
Use the billing name of the customer that is responsible for the purchase. If the buyer gave you a purchase-order number or another procurement reference, include it where appropriate so the invoice can be matched to the order.
Keep the roles clear. A purchase order is a buyer-to-supplier purchasing document. Your supplier invoice is the document you issue to bill the customer. A purchase order number can be referenced on the invoice, but the purchase order itself is not your invoice and does not prove payment.
Use product descriptions the customer can recognize. Internal abbreviations can be useful when both sides use them, but an unexplained code should not be the only description if it makes the charge difficult to identify.
A small supplier invoice with clear units and quantities
This fictional example is for Northfield Supplies billing Willow Market for packaging materials. The figures are synthetic and demonstrate document structure, not recommended product prices or tax treatment.
| Description | Quantity | Rate (USD) | Amount (USD) |
|---|---|---|---|
| Thermal receipt rolls — 80 mm, order WM-104 | 12 boxes | 18.00 | 216.00 |
| Shelf labels — white, order WM-104 | 6 packs | 22.00 | 132.00 |
The unit belongs in the description or unit field so the buyer can tell whether the quantity means boxes, packs, pieces or another measure. Check that the billed quantities match the transaction and your own records before sending the invoice.
Separate ordered, delivered and billed quantities
A buyer may order one quantity, receive another quantity in a particular delivery, and be billed according to the terms you agreed. Those numbers are related but they are not automatically interchangeable.
If only part of an order has been delivered, use your agreement and records to decide what should be billed now. Do not copy the purchase-order quantity into an invoice simply because it appears on the order. NineBrief does not maintain inventory, cumulative order balances or an automatic remaining-to-deliver calculation across documents.
For delivery records, use a Delivery Note. The current Purchase Order → Delivery Note workflow asks you to review the quantity delivered now rather than silently treating the ordered quantity as delivered.
Keep the supplier documents distinct
| Document | Who normally prepares it in this workflow | What it records |
|---|---|---|
| Purchase order | Buyer | The goods or services the buyer is ordering and the purchasing terms entered on that document. |
| Delivery note | Supplier or sender | The stated quantities being handed over or delivered, plus delivery references and acknowledgement fields. |
| Invoice | Supplier or seller | The amount being billed, including the products, quantities, rates and adjustments entered on the invoice. |
A delivery note is not a tax invoice, receipt or proof of payment. A signature field does not by itself verify a signer's identity. Keep the records required for your transaction outside the free generator as appropriate.
Check unit prices, adjustments and payment separately
For each line, verify the product, quantity, unit and agreed price. If a discount, tax, delivery charge or other supported adjustment applies, enter it only after checking how it should be calculated. The editor can calculate supported totals from what you enter; it does not decide the correct tax or commercial treatment for you.
Use payment instructions that the customer can verify. Enter an amount paid only after you have confirmed receipt in your payment records. A supplier invoice marked Paid is still user-entered document state, not independent bank or processor confirmation.
If the buyer disputes a quantity or price, reconcile it against the order, delivery record and agreement before changing the document. NineBrief does not adjudicate disputes or reconcile multiple invoices for one purchase order.
A practical small-supplier workflow in NineBrief
- Check the buyer's billing name, order reference and the goods actually being billed.
- Open the Invoice Generator and enter separate product lines with clear units, quantities and prices.
- Add the issue date, due date, currency and verified payment instructions.
- Review any applicable discounts, tax, delivery charges or other adjustments.
- Finish editing, check the clean document, save the PDF and export an editable JSON backup for your own records.
If you need to prepare a buyer-side order first, use the Purchase Order Generator. If you need to record the quantities delivered, use the Delivery Note Generator. These are separate records; opening one tool does not create a linked cloud order history.
Before you send a supplier invoice
- The buyer's billing name and order reference are correct.
- Every product line states a recognizable product, quantity and unit.
- The billed quantities and unit prices match your agreement and records.
- Delivery information is not being confused with payment information.
- Applicable adjustments and verified received payments are reflected correctly.
- The PDF has been checked and an editable backup is stored appropriately.
Can I invoice directly from a purchase order?
The current free tools do not provide a Purchase Order → Invoice conversion. Use the purchase order as a reference and prepare the invoice from the amount you are actually billing.
Does a delivery note prove the customer owes the invoice?
Not by itself. It records stated delivery information. Billing rights and payment obligations depend on the transaction and the records or agreements that apply.
Does NineBrief track stock or remaining order quantities?
No. The current tools prepare individual business documents and keep their working drafts in the browser; they do not provide inventory or account-based order management.
About this resource
Prepared with AI assistance for NineBrief Inc. Product instructions are based on the current free-tool implementation; examples are synthetic and their arithmetic is checked. This is practical product guidance, not professional legal, tax or accounting advice.
For how the tools operate, see the Free Tools Terms of Use and Privacy Policy. Send corrections to hello@ninebrief.com without including confidential customer documents.