Reconciling purchase order, invoice and payment across currencies

When you run a wholesale business you place purchase orders constantly, often across dozens of suppliers and several currencies at once. Each order generates a supplier invoice, then a payment, and somewhere along the way the goods themselves arrive. The trouble is that these three or four events rarely line up perfectly, and every gap between them is a place where money can quietly leak out.

This guide explains three-way matching as the control that catches discrepancies before money leaves your account, why working in several currencies makes the job harder than it looks, and the practical habits that keep reconciliation manageable as your order volume grows.

Where the gaps appear

A single order travels through several documents before it is settled. You raise a purchase order that records what you agreed to buy, at what price and on what terms. The supplier sends a commercial invoice for what they say they have shipped. The goods arrive and someone checks them in. Then a payment leaves your account. In a busy operation, no one person sees all four of these for every order.

That is exactly where errors hide. An invoice can quote a different price or quantity from the order. A supplier can send a second invoice for goods already billed, leading to a duplicate payment. A part-shipment can be invoiced in full, or a unit price keyed in wrongly. None of these are necessarily fraud; most are honest mistakes. But once a payment has gone out, clawing it back from an overseas supplier is slow and sometimes simply does not happen.

Three-way matching as the control

The standard discipline for catching these problems is three-way matching: before you release a payment, you check the supplier invoice against the purchase order and against the record of goods actually received. Only when all three agree on what, how much and at what price does the payment go out.

The logic is simple but powerful. The purchase order says what you intended to buy. The goods-received record says what physically turned up. The invoice says what you are being asked to pay. If those three tell the same story, you are paying for what you ordered and received. If they diverge, you have caught the discrepancy on the right side of the payment, while you still have leverage to query it rather than chase a refund afterwards.

• Price match. The invoiced unit price equals the agreed order price.
• Quantity match. The invoiced quantity does not exceed what was ordered and received.
• Reference match. The invoice cites the correct purchase order so it cannot be paid twice.

Why multiple currencies make it harder

Three-way matching is harder the moment more than one currency is involved, which for an importer or distributor is most of the time. An order placed in one currency can look like a different number once it lands on a bank statement converted into your home currency. The figures genuinely do not match on their face, even when nothing is wrong, so the eye-check that works for a domestic invoice breaks down.

Conversion timing makes this worse. The rate on the day you placed the order, the rate when the invoice was raised and the rate when you actually paid can all differ, so a small variance creeps in that has nothing to do with the supplier. If you reconcile only in your home currency you cannot easily tell an exchange-rate movement apart from a genuine pricing error. The cleaner approach is to match in the currency of the order and invoice first, confirming the supplier billed you the agreed amount in their currency, and treat the conversion as a separate, visible line.

Practical habits that keep it manageable

Reconciliation stays under control when the discipline is built into routine rather than left to a year-end scramble. A few habits do most of the work.

• Use consistent references. Put the purchase order number on the order, ask suppliers to quote it on their invoices, and carry it into the payment reference. A single thread running through all three documents is what makes matching fast.
• Match before you release. Make the three-way check a step that happens before a payment is approved, not after. Catching a discrepancy is only valuable while the money is still yours.
• Reconcile promptly. The longer you leave it, the harder it is to remember which part-shipment a payment covered. Frequent, small reconciliations beat one large one.
• Keep currencies separate in your records. Hold the supplier's currency where you can, so the amount you pay matches the amount invoiced without a conversion muddying the comparison.

How Altery fits

Altery does not raise your purchase orders or post your invoices, and it is not a bank or an accounting system, but it gives you a cleaner payment record to match against. Multi-currency accounts let you hold and pay in USD, EUR and GBP, so a payment can leave in the same currency the supplier invoiced you in, which keeps the amount you paid directly comparable with the amount you ordered instead of distorted by a forced conversion.

Real-time balances and categorised spend mean each payment carries a clear record you can tie back to its purchase order and invoice, and managing several entities in one place keeps the trail consistent when different parts of the business buy from the same suppliers. With references carried through and currencies kept apart, three-way matching becomes a quick check rather than a forensic exercise. This is general information about reconciliation practice, not accounting advice.

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