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Purchase Order

A formal document issued by a buyer to a seller specifying the goods or services, quantities, prices, and delivery terms for a purchase transaction.

ProcurementAP Automation

FAQs

At what transaction size should companies require POs?

Common thresholds: require POs for all purchases above $500–$1,000 for startups; $1,000–$5,000 for mid-market companies; $5,000–$25,000 for enterprises. Purchases below the threshold may use corporate cards or simplified requisition processes. The right threshold balances control benefits against process friction.

What is a PO number and why do vendors request it?

A PO number is the unique identifier assigned to each purchase order. Vendors request it to include on their invoice, enabling the buyer's AP team to automatically match the invoice to the correct PO for approval. Invoices received without valid PO numbers often get delayed as AP staff must manually identify the right PO or return the invoice to the vendor.

What is maverick spending and how does it create problems?

Maverick spending is purchasing outside the established procurement process — bypassing the PO system, using unapproved vendors, or exceeding purchase authority. Problems include: budget overruns (commitments made outside budget tracking), lost vendor discounts (volume not consolidated), contract non-compliance, and AP chaos (invoices arriving with no matching PO).

Related Terms

Three-Way Matching

An accounts payable control process that verifies a vendor invoice against the corresponding purchase order and goods receipt before approving payment.

Accounts Payable

Short-term liabilities representing amounts a business owes to suppliers and vendors for goods or services received but not yet paid.

Early Payment Discount

A price reduction offered by sellers to buyers who pay invoices before the standard due date, improving the seller's cash flow.

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A purchase order (PO) is a commercial document and legally binding contract issued by a buyer to a seller, specifying the goods or services to be purchased, quantities, agreed prices, delivery date, delivery location, and payment terms. Upon acceptance by the seller, the PO creates a contractual obligation for both parties — the seller to deliver and the buyer to pay.

POs serve multiple critical business functions: spend commitment tracking (the company knows what it has committed to spend before receiving invoices), three-way matching (the PO is the reference document against which invoices and receiving reports are matched), budget control (PO approval workflows enforce spending authority), and audit documentation (providing an authorized record of every procurement transaction).

The PO lifecycle: (1) Requestor creates a purchase requisition; (2) Requisition is approved by budget owner; (3) Procurement converts the approved requisition to a PO and sends it to the vendor; (4) Vendor acknowledges the PO; (5) Vendor delivers goods/services; (6) Receiving creates a goods receipt; (7) AP matches the vendor invoice to the PO and GR for payment.

PO types include standard POs (one-time purchases), blanket POs (covering multiple deliveries over a period — common for recurring suppliers), contract POs (referencing master contracts), and planned POs (scheduled future deliveries). Blanket POs simplify procurement for high-frequency small purchases with the same supplier.

For companies without formal PO processes, a common financial control finding is 'maverick spend' — purchases made without POs that bypass approval controls, leading to budget overruns, contract compliance failures, and difficult AP matching. Implementing a PO system is a foundational financial control maturity milestone.