Accounts payable: a six-stage pipeline from arrival to reconciliation

Accounts payable is the only part of bookkeeping where the money leaves the building. A six-stage pipeline should run from arrival to supplier statement reconciliation. Treat it as a pipeline where each stage answers a question the next stage can assume. Skipping any stage is where the money goes wrong.

What to take away

One arrival point for every invoice is the cheapest control in the process. Every other route produces something paid late, paid twice, or both.
Approval is worth nothing unless the approver could refuse. In a business too small to separate roles, review after the fact is the substitute, and it is far better than nothing.
Supplier statement reconciliation is the stage most often skipped and the one that finds the money. Duplicate payments do not announce themselves.
Bank detail changes are verified by calling a number you already held. It is the one failure here that usually cannot be reversed.

Stage 1: Arrival, in one place

Invoices reach a small business by every route a supplier can find: an inbox, someone's personal email, a paper copy in a van, a portal that emails a notification instead of a document. Every route that is not the official route is an invoice that will be paid late, paid twice, or paid twice and late.

One destination, and everything that lands elsewhere gets forwarded there before it is touched. That is the whole control. It is unglamorous and it prevents more problems than any software feature.

Stage 2: Match before you believe it

An invoice is a supplier's claim. Matching is how you check the claim against your own records:

A three-way match compares three documents: the purchase order you raised, the goods received note (or delivery note) signed when the delivery arrived, and the supplier's invoice. The checklist below turns on whether the invoice agrees with both of the other two.

Three-way match before paying

Did we order this? Purchase order or signed quote
Did we get it? Delivery note or timesheet
Does the invoice agree? Quantity, price, currency
Check discount, tax treatment and coding account
All three agreeproceed with no judgment
Disagreesupplier error, shortfall or price change

Where all three exist and agree, the invoice can proceed with no further judgment. Where they disagree, the difference is the useful information: it is either a supplier error, a delivery shortfall, or a price change nobody told you about, and all three are worth knowing before you pay.

A very small business will not run formal purchase orders for everything. It can still run the same logic informally, as long as the person approving is not the same person who ordered it and remembers what they wanted it to cost.

Stage 3: Approve, by someone who could refuse

Approval means a named person is willing to say this is a real cost we agreed to. It is worth nothing if the approver has no basis to refuse.

In a business too small for separate roles, split at least three critical actions. Whoever raises a payment should not approve it. Whoever approves it should not be the only one who sees the bank statement.

If two of these fall to one person, a second person reviews the payment list and the bank reconciliation afterward. Review after the fact is weaker than separation before it, but far better than nothing.

Stage 4: Record it in the right period

An invoice recorded when it is paid rather than when the goods or services arrived puts the cost in the wrong month, which distorts every comparison you will make later.

Where the supply happened before the period end and the invoice has not arrived, accrue it. Goods received and not invoiced is a real liability, and a business that leaves them out reports a profit and a payables balance that are both too flattering. See expense recording for the mechanics of accruals and prepayments.

Stage 5: Pay deliberately

Ad hoc payments made whenever someone remembers produce three predictable problems: duplicates, missed discounts and unmanaged cash. A scheduled payment run fixes all three.

Early payment discount arithmetic

2%discount for paying early
$10,000invoice value
$200saved by taking it
$9,800released twenty days early

Before each run, the list is reviewed once as a list, not invoice by invoice. That review catches what individual approval cannot: the same amount to the same supplier twice, a supplier you do not recognize, a round number that does not look like a real invoice, a payment out of its usual pattern.

On timing. Suppose a supplier offers 2% off a $10,000 invoice for paying twenty days earlier than the due date — the familiar 2/10 net 30 arrangement, 2% for paying within ten days instead of the thirtieth. Taking it saves $200 to release $9,800 twenty days early.

That is roughly 2.04% for twenty days, which annualizes to something in the high thirties of percent. Framed that way, an early payment discount is a return you are choosing to accept or decline. Compare it with what that cash does elsewhere in your business.

Do the same arithmetic on the terms you are actually offered rather than assuming any offer is worth taking. If you want to see discount terms and due dates defined in full rather than assumed, the rules the federal government pays its own suppliers under work as a model: the Prompt Payment Act, 31 U.S.C. §§ 3901–3907, and its regulation at 5 CFR Part 1315, set a 30-day standard for a proper invoice and run the clock and any discount period from receipt.

On stretching. Paying late is borrowing from a supplier without asking. It has a price, usually paid in priority, price increases or supply when things are tight. If cash is short, negotiating explicitly nearly always costs less than going quiet.

Stage 6: Reconcile to the supplier's own record

This is the stage most small businesses skip, and it is the one that catches almost everything else.

Every supplier can send a statement of what they think you owe. Compare it with your ledger, line by line, and every difference is one of a small number of things:

What you see	What it usually is	What to do

Statement differences and what they mean

What you see

On their statement, not your ledger: Invoice never arrived
In your ledger, not their statement: Duplicate or unprocessed credit
Same invoice, different amount: Price change or dispute
Paid by you, still open: Payment misallocated
Old small balances both sides: Rounding or unapplied credits

What it usually is

On their statement, not your ledger: Get copy, match, accrue
In your ledger, not their statement: Check your own entry first
Same invoice, different amount: Resolve against delivery record
Paid by you, still open: Send remittance and reference
Old small balances both sides: Clear them deliberately

What to do

On their statement, not your ledger
In your ledger, not their statement
Same invoice, different amount
Paid by you, still open
Old small balances both sides

The differences that turn up most often:

A missing invoice.The supplier billed and posted it; you never received it, so your ledger is short. Ask for a copy and record it in the right period.
A duplicate.The same invoice posted twice, or two invoices for one delivery. This is the difference that recovers money rather than paperwork.
A credit note you have not recorded.A return, a rebate or a price adjustment the supplier has already applied.
A payment the supplier has not allocated.You paid, the supplier has not matched the payment to the invoice, and the statement still shows it as owed.
A price or quantity difference.What was billed against what you ordered and what actually arrived.

Do this monthly for your significant suppliers and at least once a year for the rest. Duplicate payments almost never announce themselves; a statement reconciliation is how they surface. It is the clearest example of the principle in the bookkeeping foundations guide, that books are proved by agreement with somebody else's record rather than by adding up.

The fraud that targets this exact process

The common attack is not sophisticated. Someone emails, apparently from a real supplier, saying the bank details have changed. The invoice looks right because it often is right: taken from a compromised mailbox.

Bank detail change request

Supplier emails new bank details

Yes

Call a number you already held

Never use the number in the message

The control is one rule with no exceptions. Bank detail changes are verified by calling a number you already held. Never use a number in the message, and never reply to it. Add a second: any first payment to newly changed details is confirmed with the supplier afterward.

Urgency in the request is the signal, not the reason to hurry. A genuine supplier will wait for a phone call.

What is worth measuring

Measure things you would act on:

How long invoices sit before approval.This is entirely within your control and it is usually the largest part of any delay.
The share of invoices that match first time.Falling means either a supplier problem or an ordering problem, and the two need different fixes.
Duplicates and near-duplicates caught, and where they were caught.If they are all being caught at reconciliation rather than at the payment run, the run review is not working.
Discounts available versus discounts taken, with the reason for each one missed.
The payables balance next to the cash you expect to havewhen those invoices come due. That comparison is the point where payables stops being a filing task and becomes cash planning, and it is the mirror image of the collections question covered in the accounts receivable guide.

Averages are only meaningful against your own history. Comparing your figures to a number found online tells you nothing about your suppliers, your terms or your industry.

The line between recording and advice

Matching, coding, scheduling, reconciling and flagging exceptions are all bookkeeping, and all of it rests on documents.

Some questions need an accountant or a lawyer. Is a disputed invoice legally payable? How should a lease or finance arrangement be treated? Does a supplier arrangement create an employment relationship? That starts from the federal test for independent contractor or employee: the IRS common-law factors, the twenty-factor checklist set out in Revenue Ruling 87-41, and Form SS-8, which asks the IRS for a determination. What should you do when you cannot pay everyone? Those questions also need professional advice.

The bookkeeping job at that point is to have the contract, the delivery evidence and the correspondence in one place so the advice is quick and the answer is based on facts rather than recollection.

Common questions

We are two people. How much of this is realistic?

All six stages, informally. One inbox, one person confirming the thing arrived, one person coding, one review of the payment list before release. What is not realistic is full separation of duties, and the substitute is that the review happens at all.

A supplier will not send statements. What then?

Ask once in writing, and if none comes, reconcile from their invoice numbering instead: a gap in the sequence of invoices you hold from a regular supplier is a missing invoice. It is weaker than a statement and it is better than nothing.

Should recurring card charges go through this process?

They should, and they usually do not, which is why they accumulate. The workable version is a yearly review of every recurring charge asking whether anyone would notice it stopping, plus fetching the invoice each month rather than relying on the card line.

How long should we take to pay?

It starts from the terms you agreed, which are written as a net figure: net 30 means the full amount is due 30 days from the invoice date. Beyond that it follows from what your cash allows and what the relationship will bear. What is certain is that going quiet costs more than asking.

Who should hold the supplier bank details?

Someone who does not release payments, with every change logged and verified. That single separation removes the most expensive failure available in this process.