What a purchase order does for an accommodation booking
A purchase order, or PO, is a document a company issues to a supplier that formally authorises a purchase before any money changes hands. It sets out what's being bought, the agreed price, and the budget it's coming from, and it carries a unique PO number that ties everything together afterwards.
For contractor accommodation, raising a purchase order turns an informal booking into an approved, trackable commitment. Finance knows in advance what's been committed, the supplier knows they'll be paid against an authorised order, and the eventual invoice has a reference to match against.
Getting the purchase order for contractor accommodation right at the start is what stops a booking stalling later in accounts payable, and it's usually far quicker than people expect once you know the steps.
Why procurement teams insist on a PO
In many firms, especially larger contractors and corporates, no invoice gets paid without a matching PO, full stop. This is the no PO, no pay policy, and it exists to keep spend controlled, visible and approved before it happens rather than questioned afterwards.
From procurement's side the PO is the control point. It captures who authorised the spend, against which budget or project code, and at what price, so the commitment is recorded the moment it's made rather than discovered when an invoice lands.
Understanding that the PO is a control, not red tape, helps the whole booking flow more smoothly, because you're giving finance exactly the authorisation trail they need to release payment without a query.
The information a PO needs to carry
A clean PO for accommodation should capture everything finance needs to approve it and match it later. Vague POs are the ones that bounce back, so it pays to get the detail right first time.
Pin these down with the supplier before the PO is raised, so the order, the booking and the eventual invoice all describe the same thing in the same terms.
- check_circleA unique PO number, generated by your purchasing system
- check_circleSupplier name and account details, ideally already set up as a vendor
- check_circleA clear description: accommodation, the property or location, and the dates
- check_circleThe agreed rate and total value, with VAT treatment stated
- check_circleThe project code, cost centre or budget line it's charged to
- check_circleThe authoriser and any internal approval reference
Getting the PO approved internally
Before a PO is issued it usually passes through an approval chain set by spend thresholds. A modest booking might need a single line-manager sign-off, while a larger or longer commitment can require budget-holder or even senior approval.
The practical lesson is to start the approval early. Confirming the accommodation, the dates and the price with the supplier first means the PO request goes in complete, with nothing for an approver to query, which is where most delays actually happen.
If your project has predictable, recurring accommodation needs, it's worth asking whether a blanket or standing PO can cover a run of bookings, so you're not raising a fresh order every week.
Getting the PO number onto the invoice
Once the PO is approved, the single most important step is giving the PO number to the supplier and asking them to quote it on every invoice. An invoice without the PO number is the classic reason accommodation payments get held in accounts payable.
A good accommodation provider will record the PO number against your booking and print it clearly on the invoice, alongside the dates and the rate that match the order. That one reference is what lets finance connect the invoice back to the authorised spend without chasing anyone.
Make it a habit: confirm the booking, send the PO number, and check it appears on the first invoice exactly as raised. A few seconds there saves a fortnight of payment chasing.
Three-way matching, and why it speeds you up
When the invoice arrives, finance typically runs a three-way match: they line up the purchase order, the record that the service was received, and the invoice itself. If all three agree on the supplier, the description, the dates and the amount, the invoice clears for payment automatically.
Mismatches are what cause holds. If the invoice value differs from the PO, or the dates don't line up because a stay was extended without updating the order, the match fails and the payment stops until someone resolves it.
The takeaway is to keep the PO and the booking aligned throughout. If a contractor's stay extends or changes, update the PO at the same time so the eventual invoice still matches, and the three-way match clears first time.
Handling changes and extensions cleanly
Accommodation bookings move. Projects overrun, a crew needs an extra fortnight, or a room is added mid-stay. The danger is that the booking changes but the PO doesn't, leaving an invoice that no longer matches the authorised order.
The clean approach is to treat the PO as a living document. When the booking changes, raise an amended or additional PO to cover the extra value before the new invoice is issued, so authorisation always stays ahead of the spend.
Working with an accommodation provider who's used to PO-based corporate bookings makes this painless, they'll flag when an extension needs a fresh PO, quote the right numbers on each invoice, and keep the paperwork matching so your bookings clear procurement without delays.
Frequently asked questions
What is a purchase order for accommodation and why do I need one?expand_more
A purchase order is a document your company issues to authorise a booking before payment, carrying a unique PO number, the agreed price and the budget it's charged to. For contractor accommodation it turns an informal booking into an approved, trackable commitment. Many firms operate a no PO, no pay policy, so without one the supplier's invoice may not be paid at all.
What information should a PO for contractor accommodation include?expand_more
It should carry a unique PO number, the supplier's name and account details, a clear description of the accommodation with the property or location and dates, the agreed rate and total value with VAT treatment, the project code or cost centre, and the authoriser. Pin these down with the provider before raising the PO so the order, booking and eventual invoice all describe the same thing.
Why do accommodation invoices get held in accounts payable?expand_more
The most common reason is a missing or incorrect PO number on the invoice, which breaks the link to the authorised spend. The other frequent cause is a mismatch, where the invoice value or dates differ from the PO because a stay was extended without updating the order. Quoting the right PO number and keeping it aligned with the booking prevents both.
What is three-way matching?expand_more
It's the check finance runs before paying an invoice. They match three things: the purchase order, confirmation that the service was received, and the invoice. If all three agree on supplier, description, dates and amount, the invoice clears automatically. If they don't, the payment is held until the discrepancy is resolved, which is why keeping the PO and booking aligned matters.
How do I handle a PO when a contractor extends their stay?expand_more
Treat the PO as a living document. When the booking changes, raise an amended or additional purchase order to cover the extra value before the new invoice is issued, so authorisation stays ahead of the spend and the invoice still matches the order. A provider experienced with corporate bookings will flag when an extension needs a fresh PO and quote the right numbers each time.