A purchase invoice is the bill your supplier sends you after they deliver. In plain money terms: it is a record of money you owe, not money you are owed.
That one sentence settles most of the confusion. The same piece of paper is a sales invoice to the business that issued it and a purchase invoice to the business that received it. Nothing about the document changes — only which side of the transaction you are standing on.
- Who sends it: your supplier, after they deliver.
- Who receives it: you, the buyer.
- Money in or money out: out — it is money you owe.
- Same as a sales invoice? Same document, opposite sides. The supplier files their copy as a sales invoice; your copy is the purchase invoice.
- Same as a receipt? No. A purchase invoice asks you to pay. A receipt proves you already paid.
This guide is for Malaysian business owners and admin staff who receive supplier bills and need to check, record and pay them without missing a due date. Below: a free template, a filled RM example, a decision table for working out what is in your hand right now, and the step-by-step way to record one.
01. What a purchase invoice is, in plain terms
A purchase invoice is your supplier’s demand for payment. They delivered something; this document says what it was, what it costs, and when they expect the money.
Accountants file it under accounts payable — the pile of money leaving your business. You do not need that term to use it correctly. What matters day to day is simpler:
- It proves what you actually bought, at what price.
- It starts the clock on when you must pay.
- It is the record you check a supplier’s statement against when the numbers do not agree.
- It is the supporting document behind the expense in your accounts.
You may also hear it called a supplier invoice or a vendor invoice. Those are the same thing, and some businesses simply say “bill”. There is no difference in meaning — only in habit.
02. Download the free template and filled example
Most businesses receive purchase invoices rather than write them. You still need the form when you are logging supplier bills in a spreadsheet, reconstructing a document that went missing, or issuing one on a supplier’s behalf under an agreed arrangement.
The form with live formulas — plus a second sheet: a payables register that tracks due date, amount paid and the balance still outstanding.
Excel ↓If you would rather type than use a spreadsheet, or you need to restyle the header for your own letterhead.
Word ↓Blank, for printing and filling by hand, or emailing a copy nobody can accidentally edit.
PDF ↓The Kedai Runcit Aman bill below, filled in and part paid, so you can see a finished one before you start.
PDF ↓Free · No sign-up · RM-ready · Works on your phone or PC.
The worked example, in full
This is the invoice in the completed PDF. Kedai Runcit Aman Enterprise received a delivery from Syarikat Bekalan Maju Sdn Bhd and was billed for it.
| Description | Qty | Unit price (RM) | Amount (RM) |
|---|---|---|---|
| Beras Super Tempatan 10kg | 40 | 32.00 | 1,280.00 |
| Minyak Masak 5kg | 24 | 27.50 | 660.00 |
| Gula Halus 1kg | 100 | 3.20 | 320.00 |
| Tepung Gandum 1kg | 60 | 2.90 | 174.00 |
| Subtotal | 2,434.00 | ||
| SST, if charged | — | ||
| Total payable | 2,434.00 | ||
| Part payment, 20 August 2026 | 1,000.00 | ||
| Balance outstanding | 1,434.00 | ||
Invoice no. PI-2026-0417 · dated 12 August 2026 · against purchase order PO-2026-0331 and delivery order DO-2026-0402 · terms Net 30, due 11 September 2026.
Why there is no SST line in this example: this supplier is not SST-registered, so none was charged. Whether SST applies at all — and at which rate — depends on the class of goods or services as prescribed by the Royal Malaysian Customs Department, not on the supplier’s preference. The authority is the MySST portal.
03. Purchase invoice vs sales invoice: the decision table
This is the question that sends most people searching, so here is the answer before the explanation.
Ask one thing: who is paying? If money is leaving your business, the document in your hand is a purchase invoice. If money is coming in, it is a sales invoice.
Kedai Runcit Aman orders RM2,434 of goods from Syarikat Bekalan Maju. Bekalan Maju delivers, then sends a bill. To Bekalan Maju that document is a sales invoice — money coming in. To Kedai Runcit Aman the very same document is a purchase invoice — money going out. Kedai Runcit Aman now owes RM2,434.
| If you… | The document is a | Money direction | Where it lands |
|---|---|---|---|
| Received it from a supplier | Purchase invoice | You pay out | Accounts payable — money you owe |
| Issued it to your customer | Sales invoice | You receive | Accounts receivable — money owed to you |
A quick check when you are unsure: look at whose name sits in the “Bill to” field. If it is your company, you owe the money.
If you are on the other side of this and issuing bills to your own customers, see our guide to the sales invoice in Malaysia.
04. What “PO” and “PI” actually mean
Purchase order = “I want to buy this.” You send it, before delivery.
Purchase invoice = “You bought this, and you now owe this amount.” The supplier sends it, after delivery.
PO is a purchase order — the document you send a supplier to place an order, before anything is delivered. It says “I agree to buy this, at this price.”
PI is the ambiguous one, and it is worth being careful because it is used for two different documents:
- PI as purchase invoice — the supplier’s bill, arriving after delivery. You owe money.
- PI as proforma invoice — a preliminary, quote-like document sent before delivery, often to arrange payment in advance. It is not a demand for payment and is not recorded as a liability.
If a supplier says “I’ll send you the PI”, ask which one they mean. The difference decides whether you owe money today or not.
What comes first? The purchase order comes first, then the goods, then the purchase invoice. A purchase order is your commitment to buy; a purchase invoice is the supplier’s request to be paid for what they delivered.
05. Every field on a purchase invoice, explained
When a supplier bill arrives, check these fields before you file it. A missing or wrong field here is what causes a payment dispute three months later.
| Field | Why it matters |
|---|---|
| Supplier name, address, registration number | Confirms who you are actually paying |
| Invoice number | The unique reference for every follow-up and payment |
| Invoice date | Usually the date the payment clock starts |
| Your company details, in “Bill to” | Confirms the bill is genuinely yours |
| Purchase order number | Lets you match the bill to what you ordered |
| Description, quantity, unit price | What you are being charged for, line by line |
| Subtotal | The amount before any tax |
| SST, if it applies to the supplier | Shown as its own line, never merged into the subtotal |
| Total payable | The figure you actually pay |
| Payment terms and due date | When the money must leave |
| Bank details | Where to send it |
On SST: whether a supplier charges it depends on that supplier’s own registration and on the goods or services involved. Treat the amount shown as theirs to justify, and check it against their SST registration if the figure looks wrong — you can check whether a supplier is SST-registered. The Royal Malaysian Customs Department is the authority on who must charge it.
06. Where it sits in the buying process
A purchase invoice is one step in a chain. Seeing the whole chain is what stops documents getting mixed up:
- Quotation — the supplier tells you what it would cost.
- Purchase order — you confirm you want it, at that price.
- Delivery order — the goods arrive with a note listing what is in the box.
- Purchase invoice — the supplier bills you. You are here.
- Payment — you pay, in full or in instalments, often raising a payment voucher to authorise it.
- Receipt — the supplier confirms the money arrived.
Two documents can interrupt this chain. If the supplier overcharged you or you returned goods, they issue a credit note reducing what you owe. If they undercharged, a debit note increases it.
The one habit worth building: three-way matching. Before paying, put the purchase order, the delivery order and the purchase invoice side by side. Did you order it? Did it arrive? Are you being billed the right amount? If all three agree, pay. If not, query it before the money leaves.
07. How to record a purchase invoice by hand
If you are tracking supplier bills in a book or a spreadsheet, this is the working method.
- Check it before anything else. Run the three-way match from section 06, and query anything that does not agree now — not after you have paid.
- Give it a file reference. Number every supplier bill as it arrives — a simple running number is enough. Write that number on the physical copy.
- Record it in your payables list. One row per invoice: date received, supplier, invoice number, total amount, SST amount if shown, due date, and a payment status column.
- File the document itself where the reference number will find it again, whether that is a physical folder or a scanned folder on your computer.
- Enter the expense in your books against the right category — stock, utilities, services, and so on. This is what makes your profit figure correct.
- Diarise the due date. Put it somewhere you will actually look before the date arrives.
- When you pay, close the loop. Record the payment date, the amount and the method against that row — a payment voucher is the usual internal record. Mark it paid — or part paid, with the balance still showing.
Done consistently, this works. The weakness is not the method; it is that every step depends on someone remembering to do it.
08. Where the manual method breaks down
Manual tracking holds up until volume rises. These are the failures that actually cost money:
- You pay the same invoice twice. A bill arrives by email and again on paper, gets two references, and gets paid twice. Recovering it means asking a supplier to return money they have already banked.
- You miss a due date. Nothing in a spreadsheet warns you. You find out when the supplier calls, and the relationship — or your credit terms — takes the hit.
- The same figures get typed twice. Once into the payables list, again into the accounts. Two chances to mistype, and no easy way to know which one is wrong.
- Nobody matches the delivery order. You are billed for twelve units and eleven arrived. Without a three-way match, nobody notices.
- You cannot answer “how much do we owe right now?” without adding it all up by hand — so nobody asks, and cash decisions get made blind.
Every one of these is a bookkeeping-effort problem rather than a business problem. That is the point at which a system earns its keep.
09. Recording a purchase invoice in Niagawan
Whatever system you use, the job is the same five things: record the supplier bill once, track its due date, record a part payment against it, always see the balance still outstanding, and have the expense reach your accounts without being typed a second time.
In Niagawan, that is what recording a supplier bill does. You enter the supplier, the invoice details and the due date once; the amount joins your payables — simply, the list of money your business still owes suppliers — and the expense reaches your profit and loss from the same entry. “What do we owe, and when” becomes a screen you look at rather than a sum you add up.
10. Payment terms, due dates and partial payments
Payment terms state how long you have to pay. Common ones on Malaysian supplier invoices:
| Term | What it means |
|---|---|
| Cash on delivery (COD) | Pay when the goods arrive |
| Net 30 | Pay within 30 days of the invoice date |
| Net 60 | Pay within 60 days of the invoice date |
| 50% deposit, balance on delivery | Split payment, agreed up front |
| Payment in advance | Pay before anything is delivered |
Two details are worth checking every time. First, what the clock starts from — the invoice date and the delivery date are often not the same day, and “Net 30” counted from the wrong one costs you a month. Second, whether an early-payment discount applies; some suppliers offer a small reduction for paying quickly, and it is only worth taking if your cash position allows.
For part payments, record each payment separately against the same invoice, always keeping the outstanding balance visible. In the worked example above, RM2,434.00 was billed and RM1,000.00 paid, leaving RM1,434.00 outstanding — and the invoice stays open until that reaches zero. This is the single most common place manual records go wrong.
11. Common mistakes to avoid
| ❌ The mistake | ✅ Do this instead |
|---|---|
| Filing the bill without checking it — pay first, discover the error later, then ask for money back. | Match against the purchase order and delivery order before it joins the payables list. |
| Treating a proforma invoice as a purchase invoice. It is not a bill and should not be recorded as money owed. | Confirm which document you have before it enters your books. |
| Recording only the total, with no line detail. | Keep the line items — that is what lets you argue a wrong charge months later. |
| Marking a part-paid invoice as “paid”, so the balance quietly disappears. | Record the amount paid and keep the outstanding balance visible until it is zero. |
Bryant Gan is the Founder of Niagawan — the cloud accounting and POS system used by more than 40,000 businesses in Malaysia since 2016. He has spent over 10 years building software that helps Malaysian SMEs keep their books, stock, and tax records in order.
Purchase invoice FAQ
What is a purchase invoice?
A purchase invoice is the bill a supplier sends you after delivering goods or services. It records money you owe, and is filed under accounts payable.
What is the difference between a purchase invoice and a sales invoice?
They are the same document viewed from opposite sides. The business issuing it records a sales invoice, which is money coming in; the business receiving it records a purchase invoice, which is money going out. If your company name is in the "Bill to" field, you owe the money.
What is PO and PI?
PO is a purchase order, the instruction you send a supplier to supply goods, sent before delivery. PI usually means purchase invoice, the supplier's bill sent after delivery, but some businesses use PI for proforma invoice. Confirm which is meant, because only one of them means you owe money now.
How do you record a purchase invoice?
Check it against the purchase order and delivery order, give it a reference number, record it in your payables list with the due date, file the document, enter the expense against the right category, and mark it paid when the money leaves. Keep the balance visible if you only pay part of it.
Who issues a purchase invoice?
The supplier issues it. The buyer receives it and records it as a purchase invoice, while the supplier records their own copy as a sales invoice.
Is a purchase invoice money in or money out?
Money out. A purchase invoice records money your business owes a supplier, so it reduces your cash when you pay it. The document that brings money in is a sales invoice, which you issue to your own customer.
What happens if I only pay part of an invoice?
Record the amount you paid against that invoice and keep the outstanding balance visible. The invoice stays open until the balance reaches zero. Marking it simply as 'paid' is the most common way a balance quietly disappears from the records.
Can I record a purchase invoice without a purchase order?
Yes. Plenty of small or urgent purchases never have a purchase order, and the invoice is still valid. You just lose the ability to check the bill against what you agreed to buy, so check it against the delivery order and your own record of the order instead.
Do I need to keep purchase invoices?
Yes. They are the supporting proof behind every expense in your accounts, the record you check a supplier statement against, and what your accountant will ask for. Keep them filed so the reference number finds them again. Your accountant or LHDN can confirm how long records should be kept for your business.
What comes first, a purchase order or an invoice?
The purchase order comes first. You send it to order the goods; the supplier sends the invoice after delivering them.
Is a purchase invoice the same as a receipt?
No. A purchase invoice requests payment. A receipt confirms payment was made. You should end up holding both.
Does a purchase invoice always show SST?
No. SST appears only if the supplier is SST-registered and the goods or services are taxable. Which goods and services attract SST, and at which rate, is set by the Royal Malaysian Customs Department, so check the supplier's registration if a charge looks wrong.