Purchase Orders, Invoices & Payment Terms

You have chosen a supplier and agreed on terms. Now comes the part that turns a decision into money actually leaving the company: the paperwork. Purchase orders, invoices, and payment terms form a small, sturdy system designed to make sure the right thing is ordered, the right thing arrives, and the right amount gets paid — with checks at each step so nobody, inside or outside, can quietly cheat. It looks like bureaucracy. It is actually a trust machine.

The chain: PO, then goods, then invoice, then payment

A purchase order (PO) is the buyer’s official “yes, send me this.” It lists exactly what you want, how many, at what price, and gets approved internally before anything is ordered. The supplier ships the goods or does the work. Then the supplier sends an invoice — their official “here is the bill, please pay.” Finally, once everything checks out, the company pays. The order matters: the PO comes first on purpose, so spending is approved before it happens, not explained away afterward.

Reading payment terms: what Net 30 really means

Payment terms say when the bill is due. The most common is Net 30: you have 30 days from the invoice date to pay in full. Net 60 and Net 90 stretch that to 60 or 90 days. Longer terms are good for the buyer — you keep your cash longer — and a small strain for the supplier, who waits longer to be paid. Sometimes you will see something like 2/10 Net 30, which means “pay within 10 days and take 2% off, otherwise the full amount is due in 30.” That early-payment discount is a real lever: paying a little early can quietly save a couple of percent on every bill.

The 3-way match: the company’s quiet bodyguard

Before a big invoice gets paid, careful companies run a 3-way match. They line up three documents and check that they agree: the purchase order (what we ordered), the goods received note (what actually showed up), and the invoice (what we are being billed for). If all three match — same items, same quantities, same price — payment goes through. If the invoice says 100 units but only 80 arrived, the match fails and the bill is held until it is sorted out.

Rule of thumb: if the PO, the receipt, and the invoice all agree, pay it. If any one disagrees, stop and ask why before a cent moves.

The 3-way match is the unglamorous control that catches overbilling, duplicate invoices, and goods that never arrived. It is the reason the paperwork exists at all: not to slow you down, but to make sure the company only pays for what it ordered and actually received.

Spot it: the payment chain

Read each situation and decide for yourself, then tap a card to flip it and check your answer.

Sort the payment documents and terms

Drag each item into the stage or concept it belongs to — or tap an item, then tap a category. Hit Check placement when you’re done.

Why this matters to you

Even if you never raise a PO yourself, you will bump into this chain constantly. A vendor chasing you because their invoice “has not been paid” is usually stuck somewhere in this process — maybe no PO was raised, maybe the match failed. Knowing the steps lets you find the snag instead of just apologising. And when finance says “we cannot pay without a PO,” they are not being difficult; they are protecting a control that keeps the whole company honest.

How to use it

When you want to buy something, ask first: “Do I need to raise a PO before I order this?” Raising it up front prevents the awkward scramble later. When a supplier complains about a late payment, trace the chain: “Was a PO raised? Did we log the goods as received? Does the invoice match?” When you see payment terms, read them out loud: “Net 30 means we have a month — is there an early-payment discount?” Useful phrases: “Has this got a PO against it?” “Did the 3-way match clear?” “What are the payment terms on this one?” Speaking this language turns you from someone who waits on accounts payable into someone who can unblock a stuck payment.