Supplier Payment Terms: Net 30, Net 60 or Upfront

You have negotiated a good price. The service does what you need, the contract looks reasonable, everyone wants to proceed. Then the order form arrives and the payment terms say 100% annually in advance.

Payment terms tend to be treated as an administrative detail — something Finance sorts out once the real negotiation is finished. They are not. How and when you pay decides who is carrying the risk at each point in the relationship, and the same headline price can leave you exposed to wildly different amounts depending on the schedule attached to it.

What Net 30 actually means — and from when

Net 30 means an invoice is due within 30 calendar days of an agreed starting point. A £5,000 invoice issued on 1 March is normally due on 31 March.

The part that causes arguments is the starting point. These three are not the same:

• 30 days from the invoice date
• 30 days from receipt of a valid invoice
• 30 days from acceptance of the services

They can produce payment dates weeks apart, and "valid invoice" does real work — a supplier whose invoice was rejected for a missing PO number may find the clock never started. Whatever the contract says, make sure it says something.

The rest of the vocabulary is simpler than it looks:

Term	Meaning	Who it favours
Net 15	Pay within 15 days	Supplier — faster collection
Net 30	Pay within 30 days	Balanced; the common default
Net 60	Pay within 60 days	Customer — longer use of cash
In arrears	Pay after delivery or the service period	Customer — lower prepayment risk
In advance	Pay before delivery or the service period	Supplier — funding and certainty
Milestones	Pay against defined stages	Shared, if the stages are well drafted

Neither direction is unreasonable in itself. The question is whether the arrangement fits the relationship.

What UK law requires

For business-to-business contracts, the headline position is that payment periods should not exceed 60 days. Longer can be agreed, but only where it is not grossly unfair to the supplier.

Where no payment date has been agreed at all, the statutory default treats payment as late 30 days after the invoice or the relevant delivery or service event. Public authorities are generally held to 30 days. And where a qualifying payment is late, the supplier may be entitled to statutory interest and fixed debt-recovery compensation on top of the debt.

This is also an area that is about to move. The Commercial Payments Bill, a government bill introduced in the House of Lords in the 2026-27 session, would cap commercial payment terms, change the interest regime, ban retention clauses in construction and widen the Small Business Commissioner's powers. At the time of writing it had completed its Lords stages but had not received Royal Assent, so none of it is law yet — and the commencement timetable is still unsettled.

If you are drafting terms that run for several years, that is worth knowing about now rather than discovering mid-contract. Check the current position before relying on any particular wording, and see the government guidance on late commercial payments for the regime as it stands.

The real cost of paying annually in advance

Suppliers ask for money upfront for perfectly ordinary reasons — they have costs before they can deliver, subscription billing is their standard model, it removes their non-payment risk. None of that is sinister. But it moves exposure onto you, and the size of that exposure is rarely discussed.

Take a supplier charging £24,000 a year, offering monthly in advance at £2,000 or the full £24,000 at the start of the year. Identical annual cost. Completely different risk.

Pay monthly and you are never more than about £2,000 ahead of what you have received. Pay annually and you are £24,000 ahead on day one. If the supplier stops delivering in month three, £18,000 of your money relates to services you will never get — and whether you see it again depends on your contract, the circumstances and the supplier's solvency. If they enter an insolvency process, prepaid fees are near the back of the queue.

This is the point most price negotiations miss entirely. The number everyone argues about is the annual cost. The number that decides what you could lose is the maximum you are ever prepaid by.

Is the annual discount worth it?

Suppliers usually pay you to take that risk. A typical offer:

	Monthly billing	Annual upfront
Effective monthly cost	£2,000	£1,800
Annual cost	£24,000	£21,600
Saving	—	£2,400
Most you are ever prepaid	£2,000	£21,600

A 10% saving is real money, and for an established supplier running a low-risk subscription it is often worth taking. The thing to notice is the bottom row: you are being paid £2,400 to put roughly ten times more at risk.

So the question is not "is 10% a good discount?" but "is 10% enough for this particular supplier?" Before agreeing:

• How financially stable are they, and when did you last check? This is what due diligence before signing is for.
• Is the service business-critical, and how quickly could you replace it?
• Are prepaid fees refundable on termination — and under what circumstances?
• What termination rights do you actually have?

A large, long-established supplier offering 10% is a different proposition from a twenty-person company offering the same 10% on a service you could not operate without. The discount should compensate you for the risk you are taking, and sometimes it plainly does not.

Middle grounds worth asking for

A supplier's standard billing model is rarely their only possible one, and billing structure is often easier to move than headline price. Three things worth asking for:

Split the annual payment. A £100,000 subscription invoiced £50,000 at the start and £50,000 at the six-month mark still gives the supplier payment in advance. It halves what you have at risk at any moment.

Quarterly in advance. On a £90,000 annual SaaS contract, quarterly billing takes the amount due at the start of each period from £90,000 to £22,500, and caps your prepayment exposure at the same figure.

Milestones, for projects. On a £60,000 implementation, something like 20% on signature, 30% on configuration, 30% on user acceptance testing and 20% on final acceptance ties money to progress. The critical part is defining them properly: "implementation substantially complete" is an invitation to argue, while a milestone tied to named deliverables and acceptance criteria is not.

One caution that matters. Changing the payment schedule does not reduce what you are contractually committed to pay. Moving a three-year commitment from annual to quarterly billing improves your cash flow and cuts your prepayment risk. It does not make it a shorter contract, and it is worth being clear with yourself about which problem you have actually solved.

Why Net 60 is not a free win

Pushing suppliers to 60 days looks like straightforward working-capital improvement. For a large supplier it usually is.

For a small one it may not be. They still have payroll, subcontractors and rent, and extending your terms moves your cash-flow problem onto the business you depend on. The predictable responses: the price goes up to cover the financing, discounts stop being offered, deposits start being requested, credit limits tighten, and you drift down the priority list when their capacity is tight.

Squeezing a supplier you could not easily replace is a strange way to manage a dependency. Good procurement is not simply obtaining the longest terms available — and in any case that lever is one of the things the Commercial Payments Bill is aimed at.

Payment terms and renewal clauses work together

Payment terms should never be read in isolation, because the expensive combinations are made of several clauses that look harmless apart.

A contract that renews automatically, requires 90 days' notice, invoices the full year in advance and makes prepaid fees non-refundable is four reasonable-sounding provisions that together mean one missed date costs you a full year's fees, payable immediately. Evergreen agreements are particularly good at this, and the date that matters is not the renewal date but the notice deadline that sits in front of it.

So when you record a contract, record the payment terms next to the dates. A register that captures billing frequency, annual value, total committed value, whether payment is in advance, and the notice deadline tells you something a list of expiry dates cannot: that three large contracts all renew in March on annual upfront terms, and Finance should know about that in January. That is the argument for a register built around decisions rather than documents.

Before you sign

Five questions, none of which take long:

1. When does the clock start? Invoice date, receipt of a valid invoice, or acceptance.
2. Advance or arrears? And what is the most you are ever prepaid by?
3. What happens if they fail? Refund rights, termination rights, continuity.
4. Can the billing frequency move? Quarterly or split-annual is often available for the asking.
5. What happens at renewal? Does another full payment obligation arise automatically?

Two suppliers quoting the same service at £24,000 payable monthly and £22,000 payable upfront are not making the same offer, and the cheaper one is not automatically the better deal. It might be. But that is a judgement about the supplier's stability and your ability to replace them, not a comparison of two numbers.

Timemy keeps contracts, payment terms, values and key dates together, so the cash-flow picture and the renewal picture are the same picture. See how contract tracking works.

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The short version: the price tells you what the contract costs; the payment terms tell you what you could lose. Check what starts the payment clock, work out the most you are ever prepaid by, and treat an annual-upfront discount as payment for risk rather than a free saving. Billing frequency is usually more negotiable than price, and payment terms only make sense read alongside the renewal and notice clauses.

This article is general business information, not legal or financial advice. The rules and contractual rights that apply to payment arrangements depend on the circumstances and the jurisdiction, and the law in this area is currently changing.