Remedies for Non-Payment by a Main Contractor: Suspension and Notice Rights

Non-payment is the fastest way for an SME contractor to run out of road. A single missed certificate can drain the working capital that funds wages, plant hire, and your own supply chain, and the pressure to react is immediate. The mistake is to react by downing tools. Suspension and termination are powerful remedies, but they are also the two moves most likely to blow up in your face if you skip the steps that come first. Get the sequence right and the leverage is yours.

The escalation ladder, from letter to leaving site

Think of your remedies as a ladder, not a switch. Each rung is a defined, documented step that increases pressure while preserving your position, and you climb it deliberately rather than jumping to the top. The rungs, in order, are: a clear notice that payment is due and unpaid; a reminder that puts the paying party on notice of the consequences; a formal notice of intention to suspend; the act of suspension itself; and finally, if the default is serious and continuing, termination. Skipping rungs is what gets contractors into trouble - a suspension without the notice period, or a termination without the underlying entitlement, hands the other side a defence.

The discipline here mirrors every other entitlement on the project. Just as a delay claim collapses without a timely notice, a payment remedy collapses without the paper trail that shows you followed the mechanism. The contract almost always tells you exactly what that mechanism is; the job is to read it before you need it, not after.

Establish the debt before you threaten anything

Before you can suspend for non-payment, you need an amount that is properly due and demonstrably unpaid. That sounds obvious, but it is where many disputes are won or lost. Under most standard forms, money becomes due through the certification cycle - an application, a certificate, and a final date for payment. If you have not mastered that cycle, you are arguing about an amount the other side can plausibly say was never due. Our guide to interim payment certificates sets out how the monthly valuation works and where the pay-when-due trigger actually sits.

So the first practical step is to fix the number. Identify the certified sum, or the sum that should have been certified, and the date it fell due. If the paying party has under-certified or failed to certify at all, say so in writing and state the amount you contend is due. This converts a vague grievance into a defined debt with a due date - the foundation everything above it rests on. Keep it factual and neutral in tone; an aggressive letter at this stage rarely accelerates payment and often hardens the other side.

Notice of intention to suspend

You do not suspend by simply stopping. Under FIDIC forms, the contractor's entitlement to suspend or reduce the rate of work for non-payment sits in Clause 16, and it is gated by a notice period. Typically you must give not less than a set number of days notice of your intention to suspend, and the entitlement only crystallises if payment still has not arrived when that period expires. Many bespoke subcontracts import a similar mechanism, and much local legislation on construction payment does the same - a notice of intention, then a waiting period, then the right to suspend.

The notice of intention should identify the unpaid sum, the due date that has passed, the contractual clause you rely on, and the date from which you will suspend if payment is not received. Send it through the contractual communication channel and keep proof of service. This notice is doing two jobs: it is a genuine last call for payment, and it is the document that makes any later suspension lawful. Without it, the suspension is a breach by you.

Suspension and reduced-rate working

When the notice period expires unpaid, you have options short of a full stop. Reducing the rate of working - slowing rather than ceasing - can protect cash while keeping some progress and goodwill alive, and it is often the more commercially intelligent move. A full suspension is the heavier hammer: you cease work, secure the site and the works, and stop incurring cost you cannot recover.

Crucially, a valid suspension is not a free-for-all. You remain obliged to safeguard the works and to act reasonably. In return, a properly executed suspension usually entitles you to an extension of time for the resulting delay and to recover the cost of the suspension and remobilisation - the standby, the demobilisation and re-mobilisation of plant and people, and the associated overhead. Document those costs contemporaneously. If you resume once paid, resume promptly; dragging your feet undermines the reasonableness that protects you.

The table below summarises the ladder and what each rung requires.

Step | Trigger | What you must do | Main risk if skipped --- | --- | --- | --- Establish the debt | Certified or due sum unpaid | Fix the amount and due date in writing | Arguing over an amount never properly due Notice of intention to suspend | Debt remains unpaid | Serve notice stating sum, clause, and suspension date | Suspension treated as your breach Suspend or reduce rate | Notice period expires unpaid | Cease or slow work, safeguard the works | Losing time and cost entitlement Terminate | Serious, continuing non-payment | Serve termination notice per the clause | Wrongful termination and repudiation claim

When suspension becomes termination

Termination for non-payment is the top of the ladder and the point of no return. Under FIDIC, the contractor's right to terminate for the employer's failure to pay again sits in Clause 16, and it typically requires that the non-payment be substantial and that a further notice period elapse after suspension without remedy. The threshold is deliberately high because termination ends the contract; a court or tribunal will scrutinise whether the default was serious enough to justify it.

The danger is asymmetry of consequence. If you terminate and a tribunal later finds the default did not meet the threshold, your termination is itself a repudiatory breach - and the other side recovers its costs of completing with someone else against you. That is why the safest path to termination runs through suspension: suspension applies real pressure at far lower risk, and it often gets you paid without ever reaching the top rung. Do not treat termination as a negotiating bluff. Either the entitlement is there and you are prepared to exercise it, or it is not.

What to do before you stop work

Before you climb past the notice rungs, run a short checklist. Confirm the sum is genuinely due under the certification mechanism, not merely claimed. Confirm you have served every notice the contract requires, through the right channel, with proof. Consider whether retention is tangled up in the dispute - if part of what you are owed is held back retention, the release mechanism is a separate track worth understanding, and our note on how retention works and how to get it back explains why. Weigh reduced-rate working against full suspension. And be honest about your own performance: if you are in default on quality or programme, suspending for payment invites a cross-claim that muddies the water.

Above all, keep the tone measured throughout. The paper trail you build here is not just leverage - it is the evidence a tribunal reads if this ends in a formal claim. Where the numbers are large or the contract wording is ambiguous, a short review before you act is far cheaper than unwinding a wrongful suspension. That is precisely the ground our cure and dispute recovery service is built for.

Frequently Asked Questions

Can I stop work immediately if a main contractor does not pay me?

No - not without following the contractual steps first. Almost every standard form and most construction payment legislation require you to establish that a sum is properly due, then serve a notice of intention to suspend and wait out a defined notice period before you are entitled to stop. If you simply walk off site because a payment is late, the main contractor can characterise that as your breach, deny you the time and cost you would otherwise recover, and potentially terminate you. The notice steps are what convert a risky reaction into a protected remedy.

How much notice do I have to give before suspending for non-payment?

It depends on your contract. FIDIC forms set a defined minimum period in the contractor suspension clause, and bespoke subcontracts and local statutes each impose their own periods, which can differ significantly. There is no universal number, so read the clause that governs your contract rather than assuming a figure. The notice must identify the unpaid sum, the clause you rely on, and the date suspension will begin if payment does not arrive. Serve it through the contractual channel and keep proof of service, because the validity of any later suspension turns on that notice.

Can I recover the cost of suspending?

Usually, yes, where the suspension is valid. A properly executed suspension for non-payment ordinarily entitles you to an extension of time for the resulting delay and to recover the associated cost - standby of plant and labour, demobilisation and remobilisation, and the overhead of the interruption. The key word is valid: the entitlement flows only if you were genuinely owed the money and followed the notice mechanism. Record these costs contemporaneously as they are incurred rather than reconstructing them later, because a well-documented, real-time cost record is far harder for the other side to challenge.

Is reducing my rate of work safer than fully stopping?

Often, yes, both commercially and legally. Reducing the rate keeps some progress moving, preserves goodwill, and demonstrates that you are acting reasonably rather than punitively - all of which help if the dispute is later scrutinised. A full suspension applies more pressure but carries more risk and more disruption to your own programme and supply chain. Where the debt is significant but the relationship may survive, slowing work while your notices run can achieve payment without the rupture of a full stop. Match the response to the seriousness and permanence of the non-payment.

At what point can I actually terminate for non-payment?

Only when the non-payment is substantial and continuing, and the further notice steps in your termination clause have run without remedy. Termination is the top of the ladder and the highest-risk move: if a tribunal later finds the default was not serious enough, your termination becomes a repudiatory breach and you may owe the other side its completion costs. Because the threshold is high and the downside severe, the safest route runs through suspension first - it applies real pressure at far lower risk and frequently produces payment before termination is ever needed.

Master the ladder before you need it, and non-payment becomes a problem you manage from strength rather than a crisis you react to from weakness.

Note: This article is general information on payment remedies and does not constitute legal advice on any specific non-payment or suspension situation.