---
title: "Purchasing Process: 8 Steps, Spend Tiers and Controls"
description: "The purchasing process is the sequence of steps a business uses to buy goods and services: identify the need, raise a requisition, get quotes…"
canonical: "https://www.auravms.com/blogs/purchasing-process"
author: "Dhrumil Barot"
author_bio: "Dhrumil is a procurement veteran. Dhrumil built AuraVMS to take the manual chasing out of RFQs, supplier quotes and purchase orders."
published: 2026-10-26
updated: 2026-10-26
image: "https://www.auravms.com/og.png"
---

# Purchasing Process: 8 Steps, Spend Tiers and Controls

*By [Dhrumil Barot](https://www.auravms.com/about#founder) | Published October 26, 2026*

> **TL;DR:** The purchasing process is the sequence of steps a business uses to buy goods and services: identify the need, raise a requisition, get quotes, appro

## Purchasing Process: 8 Steps, Spend Tiers and Controls

TL;DR: The purchasing process is the sequence of steps a business uses to buy goods and services: identify the need, raise a requisition, get quotes, approve, issue a purchase order, receive and inspect, match the invoice, and pay and review. Not every purchase needs every step. Size the process to the spend: a $40 consumable needs a card and a receipt, a $40,000 contract needs three quotes, a signed PO and a three-way match.

The purchasing process (also called the purchase process or buying process) is the set of steps an organization follows to buy a product or service, from the moment someone needs it to the moment the supplier is paid. The standard sequence has eight steps: identify the need, submit a purchase requisition, source suppliers and request quotes, approve the spend, issue a purchase order (PO), receive and inspect the goods, match the invoice against the PO and receipt, then pay and record the purchase. Purchasing is the transactional part of procurement; procurement also covers strategy, supplier relationships and contracts. A good purchasing process is fast for low-risk buys and strict for high-value ones.

## What are the key stages of the purchasing process?

The purchasing process steps below are the full version. The table in the next section shows which ones you can drop for smaller purchases.

1. *Identify the need.* A department confirms what it needs, how many, by when and against which budget line. Good requests name a specification (brand, model, grade, service scope) and a delivery date, not just "laptops".
2. *Submit a purchase requisition.* The requester records the need in a [purchase requisition](https://www.auravms.com/terms/purchase-requisition), an internal document with item, quantity, estimated cost, cost center and justification. The requisition is a request, not a commitment to any supplier.
3. *Source suppliers and request quotes.* The buyer checks approved suppliers or catalogs first. When there is no agreed price, the buyer issues a request for quotation (RFQ) to several suppliers and compares the answers on price, lead time, payment terms, freight and warranty.
4. *Approve the spend.* The requisition and chosen quote go to whoever holds authority for that amount: a manager below one threshold, finance or a director above it. Approval checks budget, need and supplier choice.
5. *Issue the purchase order.* The buyer converts the approved requisition into a [purchase order](https://www.auravms.com/terms/purchase-order) carrying the PO number, items, unit prices, quantities, delivery address, delivery date, payment terms and terms and conditions. Once the supplier accepts it, the PO is a binding contract.
6. *Receive and inspect.* Receiving staff count the delivery, check it against the PO and the packing slip, and record a goods received note (GRN). Damaged, short or wrong items are flagged before anyone signs.
7. *Match the invoice.* Accounts payable compares the supplier invoice with the PO and the GRN. This three-way match catches price changes, quantity differences and invoices for goods that never arrived.
8. *Pay, record and review.* Finance pays on the agreed terms (for example Net 30), the purchase is recorded against the budget, and the buyer logs supplier performance: on-time delivery, defects and invoice accuracy.

Procurify's guide uses seven steps and Amazon Business uses eight; the difference is mostly whether negotiation and performance reporting get their own step. The work is the same.

## Which steps can you skip for small purchases?

Use a spend tier to decide how much process a purchase needs. The tiers below are a common structure for small and mid-sized businesses; set the dollar values to match your own risk and volume.

| Spend per purchase | Requisition | Quotes | Approval | PO | Three-way match |
| --- | --- | --- | --- | --- | --- |
| Under $500 (petty spend) | No | No, buy at a reasonable price | Card limit or budget owner | No, card receipt | No |
| $500 to $5,000 | Yes | 1 to 2, or an approved catalog price | Line manager | Yes | Two-way (PO vs invoice) |
| $5,000 to $25,000 | Yes | 3 written quotes | Manager plus finance | Yes | Yes |
| $25,000 to $100,000 | Yes | Formal RFQ to 3+ suppliers, documented comparison | Director or CFO | Yes, with full terms | Yes |
| Over $100,000 | Yes | RFP or tender, negotiation | Executive, sometimes board | Contract plus PO | Yes |

The $500 line is not arbitrary. Under the US Uniform Commercial Code, section 2-201, a contract for the sale of goods priced at $500 or more is generally not enforceable unless there is a writing that shows a contract was made. A purchase order is that writing. Below $500, a receipt is usually enough documentation.

Public-sector rules use the same logic. The US Uniform Guidance (2 CFR 200.320) lets grant recipients buy "micro-purchases" without competitive quotes when the price is reasonable and the reasoning is documented, and lets them self-certify a micro-purchase threshold of up to $50,000 per year. Above the micro-purchase threshold and up to the simplified acquisition threshold, they must get "price or rate quotations from an adequate number of qualified sources." Federal buyers under FAR 13.104(b) are told to consider soliciting at least three sources and, when practicable, to ask two sources not used in the previous solicitation. Private companies are not bound by these rules, but "three quotes above a threshold, rotate suppliers" is a tested default.

## How is purchasing different from procurement?

Purchasing is the transactional subset of procurement: raising the order, receiving it and paying for it. Procurement is the wider function that also includes spend analysis, sourcing strategy, contract negotiation, supplier risk and supplier relationship management. Sourcing sits between the two: finding and qualifying suppliers before a purchase happens. In a five-person company, one person does all three. In a 500-person company, a procurement team sets the contracts and approved supplier list, and departments buy against them. For a deeper breakdown, see our guide to [procurement vs purchasing vs sourcing](https://www.auravms.com/blogs/procurement-vs-purchasing-vs-sourcing-complete-guide).

The purchasing process also sits inside the larger [procure-to-pay (P2P) process](https://www.auravms.com/blogs/procure-to-pay-p2p-process-complete-guide-smb), which starts at the need and ends at payment and reconciliation in the accounting system.

## What documents does the purchasing process create?

The purchasing process produces a paper trail of six documents, and each one answers a different audit question:

| Document | Created by | Answers |
| --- | --- | --- |
| Purchase requisition | Requester | Who needed it, why, and against which budget? |
| RFQ and supplier quotes | Buyer and suppliers | Was the price competitive? |
| Approval record | Approver | Who authorized the spend, and were they allowed to? |
| Purchase order | Buyer | What exactly was ordered, at what price and terms? |
| Goods received note (GRN) | Receiving | What actually arrived, and in what condition? |
| Supplier invoice | Supplier | What does the supplier say we owe? |

When an auditor or a new finance lead asks why a supplier was paid $18,400, these six documents should answer it without anyone's memory.

## When does a purchase order become a binding contract?

A purchase order is an offer. It becomes a contract when the supplier accepts it, by signing it, sending a written acknowledgment, or shipping the goods. Two UCC rules matter here:

- *Conflicting terms (UCC 2-207).* A supplier's written confirmation sent within a reasonable time counts as acceptance even if it adds or changes terms, unless the acceptance is expressly conditional on the buyer agreeing to them. This "battle of the forms" is why buyers should read supplier acknowledgments rather than file them. Our guide to [PO acknowledgment](https://www.auravms.com/blogs/purchase-order-acknowledgment-process-guide) covers the fields to check.
- *Acceptance of goods (UCC 2-606 and 2-602).* The buyer accepts goods when, after a reasonable opportunity to inspect, it signals they conform or fails to reject them. A rejection must happen within a reasonable time after delivery and the seller must be notified. In practice, this is why step 6 should happen on the day of delivery, not when the invoice turns up three weeks later.

## How does three-way matching work?

Three-way matching is an invoice control that compares three documents before payment: the purchase order (what was ordered), the goods received note (what arrived) and the supplier invoice (what is billed). If quantity and unit price agree across all three, within any tolerance you set, the invoice is approved for payment. If not, it is held as an exception.

A worked example: the PO says 200 units at $12.00 ($2,400). The GRN records 190 units received. The invoice bills 200 units at $12.50 ($2,500). The match fails twice: 10 units were never delivered, and the price is $0.50 above the PO. The correct payment is 190 x $12.00 = $2,280 until the supplier issues a credit note or the buyer approves a price change.

Two-way matching (PO against invoice only) is common for services and low-value orders where there is no physical receipt. Four-way matching adds an inspection or quality report, used for regulated goods or components that go into production.

## What are the most common purchasing process problems?

The most common purchasing problems show up in the same places in almost every small business:

- *Maverick spend.* People buy outside approved suppliers or without a PO, usually because the official process is slower than a credit card. The fix is a faster path for low-value buys, not more rules.
- *Approval bottlenecks.* Requests wait days for a manager who is traveling. Set a deputy approver and a target turnaround, for example 24 hours below $5,000.
- *Quotes that cannot be compared.* Suppliers send PDFs with different units, freight terms and validity dates. Use one RFQ template so every quote comes back in the same format.
- *POs issued after the invoice.* "After-the-fact" POs defeat the control. Track them as a percentage of all POs and push it toward zero.
- *Receiving skipped.* Without a GRN, three-way matching cannot work and short shipments get paid in full.
- *Price creep.* Repeat orders drift above the quoted price. The three-way match catches it only if the PO price is the agreed one.

## Which KPIs measure purchasing performance?

Six KPIs cover most of what a small purchasing function needs to watch:

| KPI | Formula | What it tells you |
| --- | --- | --- |
| Purchase cycle time | Days from requisition to PO issued | How fast the process serves requesters |
| PO compliance rate | Spend with a PO before invoice / total spend | How much buying bypasses control |
| Quote coverage | Purchases above quote threshold with 3 quotes / all such purchases | Whether competition is real |
| Supplier on-time delivery | Orders delivered by the PO date / all orders | Supplier reliability |
| Invoice exception rate | Invoices failing the match / all invoices | Data quality between PO, receipt and invoice |
| Cost savings | (Average or first quote minus awarded price) x quantity | Value of sourcing effort |

Measure monthly. One number trending the wrong way, such as PO compliance falling below 80%, tells you where the process is breaking.

## How do you streamline and automate purchasing today?

To streamline your purchasing process, start by fixing the slowest step first, then automating the repetitive parts. A practical order:

1. Write a one-page [purchasing policy](https://www.auravms.com/blogs/purchasing-policy-template-rfq-approval-rules) with the spend tiers, approval limits and quote rules above.
2. Standardize the RFQ so suppliers quote in the same structure.
3. Set approval routing by amount and department, with deputies.
4. Use PO numbers on every order above the PO threshold, and require suppliers to quote them on invoices.
5. Record receipts on delivery day.
6. Automate the match so only exceptions reach a person.

Software helps most at steps 3 to 7. Spreadsheets and email work for a handful of orders a month; beyond that, quotes get lost and approvals stall. AuraVMS is RFQ and purchase-order software for small and mid-sized businesses: suppliers respond to an RFQ without creating an account, quotes are compared side by side with automatic L1/L2/L3 price ranking, and the winning quote becomes a PO. AuraVMS starts at $4.99/month, billed annually.

## Frequently asked questions

### What is the first step in the purchasing process?

The first step is identifying the need: confirming what is required, how much, by when and against which budget. Everything after depends on a clear specification; vague needs produce quotes that cannot be compared.

### What is the difference between a purchase requisition and a purchase order?

A purchase requisition is an internal request asking permission to buy. A purchase order is the external document sent to a supplier that commits the business to buy at stated prices and terms once the supplier accepts it.

### How many quotes should you get before purchasing?

Three written quotes is the common rule for purchases above a set threshold, often $5,000 for small businesses. US federal buyers are told under FAR 13.104(b) to consider at least three sources. Below the threshold, one quote or a catalog price is usually enough if the price is reasonable.

### Is a purchase order legally binding?

A purchase order becomes legally binding once the supplier accepts it, by signing, acknowledging or shipping. Under UCC 2-201, sales of goods at $500 or more generally need a writing to be enforceable, which a PO provides.

### What are the types of purchasing?

The main types are spot purchasing (one-off buys at current prices), contract purchasing (buying against a negotiated agreement), blanket orders (one PO covering repeated deliveries over a period) and catalog purchasing (choosing from pre-approved items and prices).

### How long should the purchasing process take?

For routine purchases under a few thousand dollars, requisition to PO should take one to three business days. Purchases that need formal quotes typically take one to three weeks, depending on how long suppliers are given to respond.

## Sources

- [UCC 2-201, Formal requirements; statute of frauds](https://www.law.cornell.edu/ucc/2/2-201)
- [UCC 2-207, Additional terms in acceptance or confirmation](https://www.law.cornell.edu/ucc/2/2-207)
- [UCC 2-606, What constitutes acceptance of goods](https://www.law.cornell.edu/ucc/2/2-606)
- [UCC 2-602, Manner and effect of rightful rejection](https://www.law.cornell.edu/ucc/2/2-602)
- [2 CFR 200.320, Procurement methods](https://www.law.cornell.edu/cfr/text/2/200.320)
- [FAR 13.104, Promoting competition](https://www.acquisition.gov/far/13.104)

## About the author

Written by [Dhrumil Barot](https://www.auravms.com/about#founder). Dhrumil is a procurement veteran. Dhrumil built AuraVMS to take the manual chasing out of RFQs, supplier quotes and purchase orders.

[LinkedIn](https://www.linkedin.com/in/bdhrumil) | [X](https://x.com/fyidhrumil)

## Continue this topic

- [Build a free RFQ template](https://www.auravms.com/tools/rfq-template)
- [Request for quotation glossary guide](https://www.auravms.com/terms/request-for-quotation)
- [Compare supplier quotations](https://www.auravms.com/side-by-side-easy-vendor-quote-comparison)

Source: https://www.auravms.com/blogs/purchasing-process