A colleague needs a €29-per-month software subscription. Under a classic procurement process, the request goes to purchasing, which raises a purchase order. The supplier invoices. Accounts payable matches the invoice to the order, then settles by bank transfer. Four people will have touched that file — for €29 a month. The corporate purchasing card exists precisely to cut that detour on low-value buys.
Also called a P-card (purchasing card) or procurement card, the corporate purchasing card lets a designated cardholder pay directly for a good or service without going through the purchase-order cycle. This guide explains how it works, what controls keep it safe, what it actually delivers, and under what conditions it stays under control.
What is a purchasing card?
A purchasing card is a business payment card issued in a company's name and entrusted to an employee for buying supplies, services or small equipment. What sets it apart is less the payment method than the workflow it replaces: where a standard corporate card covers everyday expenses and travel, the purchasing card targets transactions that would otherwise run through the formal procurement process[1].
The terminology shifts by region. In English the term is purchasing card, abbreviated P-card, PCard or ProCard; in the UK, procurement card prevails[1]. Don't confuse it with a general corporate card, or with a single-use virtual card for suppliers. The latter is mainly for securing a recurring payment to one vendor, as covered in our page on the virtual corporate card.
How a purchasing card works
The idea is to turn a purchase that would have generated paperwork into a simple payment transaction, then recover the accounting data automatically. For each cardholder the company sets a usage framework: a per-transaction limit, a monthly limit, an allow-list of merchant categories and a cycle period. The cardholder pays. The bank sends an electronic statement that replaces the supplier invoice. Accounts payable reconciles that statement against the receipts the cardholder kept.
Everything rests on merchant category codes (MCC), inherited from how four-party payment networks operate: issuer, acquirer, merchant and cardholder[2]. By filtering on MCCs, a company can allow office supplies and IT hardware while blocking casinos or jewellers. That filtering applies card by card: a wide frame for an experienced buyer, a tight one for an occasional user.
On the ground, the gain shows up in cycles eliminated. Take a €120 stationery order: without a card it chains request, purchase order, an invoice to key in, reconciliation and a transfer — several calendar days and several people. With a corporate purchasing card, the same operation comes down to one payment and a filed receipt, reconciled automatically on the end-of-cycle statement.
Over time, the purchasing card has stopped being just for small amounts. Many organisations now use it as a strategic settlement method for accounts payable, replacing cheques or transfers on transactions drawn from a purchase order[1]. The logic is unchanged: capture the payment trail and automate it.
The controls that keep a card safe
A purchasing card is never "open". It combines several control levers, configurable per cardholder and adjustable as the programme evolves:
| Control | Purpose | Example |
|---|---|---|
| Per-transaction limit | Stops large impulse buys | €500 / transaction |
| Monthly limit | Caps cumulative risk per cardholder | €3,000 / month |
| MCC filter | Allows only certain merchant categories | Supplies, IT, transport |
| Cycle period | Sets the reconciliation and review cadence | Monthly |
| Hierarchical approval | A manager signs off before settlement | Threshold > €1,000 |
| Independent review | Someone outside the cardholder audits usage | Quarterly audit |
These levers are detailed in our guide to corporate card spending limits and policy. The golden rule, echoed across sector references, is that no programme holds up without periodic review by someone independent of the cardholder[1].
Purchasing cards and "off-PO" buying: what's the upside?
An "off-PO" (off purchase order) buy is precisely one that doesn't warrant a full process. That's the purchasing card's home ground: supplies, software subscriptions, small tooling, repair costs, express deliveries. On these low-value transactions, the administrative cost of a full order–invoice–reconciliation cycle often outweighs the purchase itself.
The card removes that overhead and speeds up supplier payment, which eases commercial relationships and can open the door to prompt-payment discounts. On the accounting side, it cuts the volume of invoices typed in by hand. The shift is not new: by the early 2000s, purchasing cards were spreading fast across large organisations to "cut red tape" and reduce costs[1].
Benefits, and the catch
A purchasing card turns a heavy, administrative purchase into a simple, traceable payment. Fewer invoices to process, suppliers paid faster, spend data available automatically for reporting.
The benefits are real, but they vanish the moment control loosens. A card handed out with no limit, no MCC filter and no independent review becomes an unchecked authorisation to spend. The most common drifts are personal use (the most visible), off-scope buying and duplication with other payment methods. Hence the importance of an expense policy that is written down, read and enforced.
No purchasing card without a review rule. A cardholder who self-checks is not checked: build in an independent reviewer and a strict reconciliation cadence.
Rolling out a corporate purchasing card: the steps
Setting up a purchasing card programme follows a well-trodden path:
- Frame the scope. Define what the card may and may not buy, in line with the procurement policy.
- Identify cardholders. Pick the employees whose role justifies frequent, low-value purchasing.
- Configure the controls. Limits, MCC filters, cycle period, tailored to each cardholder's profile.
- Integrate accounting. Pipe the electronic statement into the accounting export to automate reconciliation. The Greenway corporate card brings limits, MCC filters and hierarchical approval together behind a single back-office, as described for corporate card integration with the accounting export.
- Audit. Set up the independent review and a periodic programme audit.
Frequently asked questions about purchasing cards
What's the difference between a purchasing card and a corporate card?
A corporate card covers general and professional expenses (travel, representation, subscriptions). A purchasing card targets low-value transactions that would otherwise run through the formal procurement process, with finer controls: per-transaction limits, MCC filters, hierarchical approval. The two can coexist in the same company.
Does a purchasing card work without a purchase order?
Yes — that's the whole point. It enables an "off-PO" buy with no purchase order raised and no manual supplier invoice to process. The electronic statement replaces the invoice and feeds accounting directly.
Is VAT recoverable on purchases paid by card?
Yes, under the usual conditions: the purchase must be for a good or service used for the business, and the supporting receipt or supplier invoice must let you identify the VAT. The card doesn't change the tax rule. It simply automates the payment and the accounting trail.
From what company size does a purchasing card make sense?
As soon as several employees regularly buy small supplies or services, a purchasing card saves administrative time. It pays off most in SMEs and mid-caps, where the cost of processing a supplier order weighs on a small purchasing or accounting team.
Who typically holds a purchasing card?
Natural cardholders are employees who buy often for their role: office managers for supplies, IT teams for hardware and software subscriptions, site leads for parts and maintenance, sales staff for samples and literature. The principle: hand the card where the time saved outweighs the residual risk.
Parent guide: the purchasing card fits into a broader business-payment system, detailed in our white paper on the corporate card and pro payments. For the CSR angle, see also the corporate card in service of CSR.
References
- Purchasing card, Wikipedia (English edition). Definition, controls (per-transaction limits, merchant category codes, independent review) and the programme's historical development. en.wikipedia.org/wiki/Purchasing_card ↩
- Sujit Chakravorti, Theory of Credit Card Networks: A Survey of the Literature, Review of Network Economics, 2003. The four-party payment network model (issuer, acquirer, merchant, cardholder) that underpins MCC codes. doi.org/10.2202/1446-9022.1018 ↩
