UK procurement: invoicing and payment Q&A

Question 1

Does the Procurement Act give suppliers a general thirty-day payment protection?

Accepted Answer

The Act implies payment terms into many public contracts and relevant subcontracts, including regulated below-threshold contracts, but there are exceptions and conditions.

The guidance describes a general thirty-day period measured from invoice receipt, subject to validity, disputes and the applicable due-date rule.

Check the actual regime and contract category before relying on it.

A supplier should also follow the agreed invoicing process and keep evidence of receipt so an avoidable administrative problem does not obscure the payment position.

Question 2

Does the thirty-day period only start after a buyer decides an invoice is valid?

Accepted Answer

The guidance distinguishes the Act from the previous approach: the relevant period is measured from receipt, provided the invoice is valid and undisputed, rather than simply from a later internal validation date.

The buyer must notify invalidity or a dispute without undue delay.

Preserve the date and method of receipt and respond promptly to a genuine query.

Do not assume that the supplier can ignore contractual information requirements merely because an invoice has been sent.

Question 3

What minimum information should a supplier check before issuing an invoice?

Accepted Answer

The guidance identifies the invoicing party’s name, a description of the goods, services or works, the requested sum and a unique identification number.

Depending on the route to validity, the contract’s other requirements also matter.

Check purchase references, milestones and delivery evidence against the agreed procedure.

The practical aim is to send a complete, accurate invoice through the required channel and retain a receipt, rather than discover a missing requirement after the expected payment date.

Question 4

Is an emailed PDF necessarily an electronic invoice in the Act’s required form?

Accepted Answer

Not necessarily. The statutory required electronic form concerns a structured format that supports automatic processing and complies with the referenced standard and syntax requirements.

An ordinary PDF attached to an email is not automatically the same thing.

The parties can have other permitted invoicing arrangements, so check what the contract accepts.

If a buyer requests a particular electronic system, confirm the technical format and process before the first billing milestone.

Question 5

Can a buyer agree a payment period shorter than the Act’s general period?

Accepted Answer

Yes. The guidance explains that the implied payment protection does not prevent agreement to a shorter period.

Read the contract for the actual commitment rather than automatically treating the statutory general period as a target the buyer must use.

A shorter promise is commercially useful only if the supplier can meet the invoicing and approval requirements and the buyer follows the agreed process.

Include the correct timing assumptions in cash-flow planning.

Question 6

Does every school contract have the same implied payment terms as other public contracts?

Accepted Answer

No. The official guidance identifies contracts awarded by schools among the exceptions to the implied terms described in section 68.

The contract can still include relevant payment commitments, and other law may matter.

Do not generalise an Act FAQ into a conclusion about every school purchase.

Read the buyer’s status, governing regime and actual terms before deciding the applicable payment obligation or a route for recovering overdue sums.

Question 7

What should a supplier do when an invoice is disputed?

Accepted Answer

Ask for the specific reason, identify the contract requirement involved and provide the missing evidence or correction through the agreed process.

Keep the original invoice, receipt, correspondence and any revised version so the timeline remains clear.

The Act’s payment guidance treats validity and disputes as material to the implied payment position.

A dispute should therefore be resolved on its facts, rather than assuming that either the buyer’s label or the supplier’s invoice automatically settles the question.

Question 8

Why should the bid team review invoicing rules before pricing the contract?

Accepted Answer

Payment milestones, evidence requirements, acceptance processes and invoicing channels affect working capital and administration.

A supplier may have to fund mobilisation and payroll before it can issue a valid milestone invoice.

The Act’s general protections do not remove those practical commercial questions.

Read the proposed contract and model the cash flow as well as the accounting margin.

Raise unclear or unworkable payment mechanics during the permitted clarification stage rather than after award.

Question 9

What evidence helps demonstrate when an invoice was received?

Accepted Answer

Keep the portal acknowledgement, transmission record or other reliable confirmation required by the agreed invoicing process, together with the invoice version submitted.

The guidance explains that receipt through an electronic invoicing system is relevant to the payment timeline.

A draft saved internally is different from an invoice received by the buyer.

Allocate responsibility for monitoring rejection messages so a technical or routing failure is identified promptly and the invoice can be corrected or resubmitted appropriately.

Question 10

Can the main contractor assume public-sector payment protections do not concern its supply chain?

Accepted Answer

No. The Act includes implied payment provisions for relevant public subcontracts, subject to the specific scope and exceptions.

Main contractors should identify which downstream agreements are covered and ensure their processes support compliant invoicing and payment.

The current official guidance contains inconsistent wording on some utilities-subcontract exceptions, so this FAQ does not resolve that specialist boundary.

Check the legislation and obtain advice for an affected arrangement instead of applying a universal flow-down statement.

UK procurement: invoicing and payment Q&A

Does the Procurement Act give suppliers a general thirty-day payment protection?＋

Does the thirty-day period only start after a buyer decides an invoice is valid?＋

What minimum information should a supplier check before issuing an invoice?＋

Is an emailed PDF necessarily an electronic invoice in the Act’s required form?＋

Can a buyer agree a payment period shorter than the Act’s general period?＋

Does every school contract have the same implied payment terms as other public contracts?＋

What should a supplier do when an invoice is disputed?＋

Why should the bid team review invoicing rules before pricing the contract?＋

What evidence helps demonstrate when an invoice was received?＋

Can the main contractor assume public-sector payment protections do not concern its supply chain?＋