What is a purchase requisition? The UK finance team's guide to spend control

Key takeaways

• A purchase requisition is an internal document raised by an employee to request management approval before company funds are spent. It has no legal binding power and creates no obligation with any supplier.

• UK procurement activities manage between 40% and 80% of an enterprise's total operational costs, making pre-purchase approval controls essential for protecting margins.

• Traditional procurement tools often stop once a purchase order is generated, while Airwallex bridges the gap — unifying corporate cards with custom spend limits, AI-powered bill pay with automatic PO matching, and local payment rails in 150+ countries — giving finance teams complete control from approved requisition through to settlement.

Uncontrolled spend rarely starts with one large, obvious transaction. It starts with smaller purchases that slip through the gaps: a software subscription approved over email, a direct order from a non-preferred supplier, or a team purchase that bypasses budget checks entirely.

A purchase requisition puts a formal checkpoint in front of all of that. It gives finance and procurement teams a structured way to validate need, verify budget, and enforce policy before money is committed — not after it has already been spent.

This guide explains what a purchase requisition is, how the workflow operates, and how connecting that process to your payment infrastructure can give UK businesses tighter control over spend from start to finish.

What is a purchase requisition?

A purchase requisition is an internal document raised by an employee to formally request permission to buy goods or services on behalf of the business. It's the opening step in the procure-to-pay lifecycle, capturing the essential details of a proposed purchase before any external commitment is made to a supplier.

Critically, a purchase requisition is not a purchasing document. It doesn't authorise a supplier to ship goods, and it doesn't create a payment obligation. Its function is internal: to act as a check-and-balance mechanism so managers, budget holders, procurement teams, and sometimes legal or IT can review a request before the business takes on any financial liability.

That distinction matters for scaling UK businesses. When procurement activity can account for 40% to 80% of an enterprise's total operating costs, validating spend before it happens is far more effective than trying to fix problems during month-end reconciliation.

What should a purchase requisition form include?

A well-designed purchase requisition form captures standardised information so the request moves quickly through approval and procurement workflows. Incomplete forms slow everything down — purchasing teams end up chasing missing details manually, which defeats the purpose of having a structured process in the first place.

Common fields to include:

The more complete the form at submission, the faster it moves through review. Digital systems can enforce mandatory fields automatically, reducing the back-and-forth that slows manual workflows.

The purchase requisition workflow: step by step

A standard purchase requisition process follows six stages, from initial need through to supplier engagement. Manual, paper-based approaches can stretch each cycle to more than a week per document. Digital processes compress that to hours.

Step 1: Identify the operational need

The process starts when someone identifies a business requirement — a new SaaS licence, replacement hardware, or stock replenishment. The requester should be able to articulate the business case clearly before raising the form.

Step 2: Submit the requisition form

The requester completes a digital requisition form with specifications, quantities, expected costs, supplier quotes, and the relevant cost centre. Digital forms enforce consistent data capture from the start, avoiding errors that stall the process downstream.

Step 3: Managerial and budgetary review

The request is routed to the appropriate manager or budget holder. They check whether the spend is necessary and whether sufficient budget is available. Approval authority is typically structured around tiered spending limits— lower-value requests go to a line manager, higher-value ones escalate to finance leadership.

Step 4: Technical and compliance screening

For higher-risk or specialist purchases, the requisition may also route to IT security or legal teams to review security requirements, contractual terms, or policy compliance.

Step 5: Procurement validation and sourcing

Once approved internally, procurement reviews the request, checks existing inventory, validates the supplier, or negotiates commercial terms if external sourcing is needed.

Step 6: Convert the requisition into a purchase order

After final validation, the approved requisition is converted into a purchase order. The PO inherits key data from the requisition, reducing manual entry errors and kicking off the external buying step.

Purchase requisitions vs purchase orders

Purchase requisitions and purchase orders are frequently confused, but they serve different functions at different stages of the buying process.

That legal distinction carries real weight. Because a purchase requisition is internal, it can be changed, rejected, or cancelled without consequence. Once it becomes a purchase order and the supplier accepts it, the business has entered a formal commercial commitment. For UK businesses managing cash flow or working within tight budget cycles, that is not a distinction you can afford to ignore.

Why bypassing requisitions leads to maverick spend

When employees buy directly from suppliers without going through a requisition process, they bypass budget checks, supplier controls, and negotiated pricing. That's one of the primary causes of maverick spend — off-contract, unmanaged purchasing that quietly erodes procurement value.

Research shows that directing purchases through contracted suppliers can recover 10% to 50% of lost procurement value. For finance leaders, that makes the purchase requisition more than an administrative formality. It's a pre-spend control point that protects margins before money leaves the business.

The impact compounds at scale. A business spending £2 million annually on procurement could be losing between £200,000 and £1 million to uncontrolled purchases if requisition workflows are absent or poorly enforced. Getting procurement flowing through approved channels — with validated suppliers and confirmed budgets — is often one of the fastest ways to improve spend efficiency without adding headcount.

Types of purchase requisition

Organisations categorise requisitions so they can apply the right approval path for different situations. Common types include:

• Standard requisitions cover routine, non-urgent purchases for day-to-day operations — bulk office supplies, standard IT hardware, or planned facility maintenance. They route through standard tier-based approval lines.

• Planned requisitions are created for anticipated procurement aligned with long-term forecasts or seasonal demand. A manufacturer, for example, might raise planned requisitions for raw materials ahead of a quarterly production run to stabilise supply lines.

• Emergency requisitions are used when immediate procurement is needed to prevent operational failure or financial loss. These bypass standard queues and route directly to senior authorisation.

• Contractual requisitions draw against pre-negotiated supplier agreements. The system verifies that pricing and delivery terms comply with the master contract before the request proceeds.

• Recurring requisitions handle repeat spend — monthly software subscriptions or utility services — reducing the need to raise a new request each cycle.

Categorising requisitions isn't just an organisational preference. It allows businesses to apply proportionate oversight — fast-tracking genuine emergencies while keeping tighter controls on discretionary or high-value spend.

How automation eliminates manual bottlenecks

Manual, paper-based, or spreadsheet-led requisition processes create delays, introduce data entry errors, and increase compliance risk. Manual document handling costs UK businesses an average of £17.50 per document, with approval cycles stretching to around eight days. That's a significant drain on finance team capacity when multiplied across hundreds of requests each month.

Digital procurement systems address several of these pain points directly.

Dynamic approval routing sends requests automatically to the right approver based on spend value, department, cost centre, or risk level. Lower-value purchases route to a line manager; high-value ones escalate to finance leadership — without manual intervention.

Real-time budget validation checks each request against live departmental budgets as it's submitted, flagging potential overspend before the purchase is approved rather than after it appears on a bank statement.

Three-way matching cross-references the purchase order, the goods received note, and the supplier invoice to confirm that what was ordered, received, and billed all line up. This supports invoice fraud prevention and simplifies end-of-month reconciliation into accounting systems such as Xero, Sage, or NetSuite.

How Airwallex closes the loop from approval to payment

Most traditional procurement tools stop at the point a purchase order is generated. That leaves a gap between approved spend and actual payment — a gap where visibility and control can break down, especially in businesses managing multiple suppliers, currencies, or entities.

Airwallex bridges that gap by connecting the procurement approval workflow directly to payment execution.

Once a requisition is approved, it can be mapped to corporate cards with custom spending limits. That means teams control spend at the point of purchase — not after a transaction has already hit the ledger. Limits can be set by merchant category, supplier, or maximum amount, giving finance teams granular oversight without slowing down day-to-day operations.

For supplier payments, Airwallex Bill Pay uses AI-powered OCR to automatically ingest supplier invoices, match them against purchase orders, and execute high-speed local payments across 150+ countries. This eliminates SWIFT transfer costs, reduces FX markups on cross-border payments, and gives finance teams a more connected workflow from approval through to confirmed settlement.

For UK businesses managing international supplier relationships, that end-to-end visibility — from the original requisition through to payment — can make a material difference to how efficiently the finance function operates. Pairing automated invoice processing with structured spend approvals is one of the more direct routes to reducing manual workload and improving expense management across the business.

Take control of your procurement spend

A purchase requisition is one of the most straightforward ways to introduce stronger spend governance into a growing business. It helps teams validate need, check budgets, route approvals properly, and prevent uncontrolled purchasing before any liability is created.

For UK finance and procurement teams, the benefits extend beyond governance. When requisitions, purchase orders, invoice matching, and payments are connected in one workflow, you gain tighter control over margins, clearer audit visibility, and less administrative friction as you scale.

Explore spend management from Airwallex to see how your approved procurement can connect directly to payment execution.

Frequently asked questions

Who prepares a purchase requisition?

Any employee, department lead, or project owner who identifies a business need can prepare and submit a purchase requisition form. In larger organisations, this is often formalised so that only designated requesters within specific cost centres can raise forms above certain value thresholds.

Is a purchase requisition legally binding?

No. A purchase requisition is strictly an internal administrative request used to secure spending approval before a purchase happens. It carries no legal binding power and doesn't constitute a contract with any supplier. Legal obligation begins when a purchase order is issued and accepted by the supplier.

Are purchase requisitions required by law?

No, they're not required by UK statute. But, a structured requisition process supports audit readiness, stronger internal governance, and financial controls that matter when businesses scale or face external scrutiny.

Can a purchase order be raised without a purchase requisition?

Yes, technically it can. But, it's not recommended. Skipping the requisition removes a key layer of budget validation and increases the risk of maverick spend, overpayment, and supplier compliance gaps. For most scaling businesses, the cost of bypassing the process far outweighs the time it saves.

Sources and references

1. Chartered Institute of Procurement & Supply (CIPS) - https://www.cips.org/intelligence-hub/procurement/purchase-requisition

2. Chartered Institute of Procurement & Supply (CIPS) - https://www.cips.org/intelligence-hub/procurement-technology/procure-to-pay-process

3. Chartered Institute of Procurement & Supply (CIPS) - https://cips-download.cips.org/short-reads/from-requisition-to-payment-how-the-procure-to-pay-process-streamlines-procurement

4. Chartered Institute of Procurement & Supply (CIPS) - https://www.cips.org/intelligence-hub/procurement/procurement-policies

5. GOV.UK, “Record keeping for VAT (VAT Notice 700/21) - https://www.gov.uk/guidance/record-keeping-for-vat-notice-70021

6. International Journal of Operations and Quantitative Management -https://www.ijoqm.org/papers/25-4-1-p.pdf / DOI: https://doi.org/10.46970/2019.25.4.1