Counterclaims and Set-Off: When a Defence Pushes Back

This works through claims raised by the party being sued in the order the parts actually depend on each other.

Two different manoeuvres

A set-off is a defence asserting that sums owed the other way should be brought into account against the claim. A counterclaim is a claim in its own right, brought by the defending party within the same proceedings.

The practical difference appears where the cross-claim exceeds the original claim or fails altogether. A successful set-off reduces or extinguishes what is owed, while a counterclaim can produce a positive award. The two are frequently pleaded together, since the same facts may support both characterisations.

When a set-off is available

Systems generally require some connection between the claim and the cross-claim before a set-off is permitted. The classic case involves the same contract, where defective performance is set against the price claimed.

For most everyday situations, some systems recognise wider forms where debts are simply mutual, without any transactional connection. Contracts commonly attempt to exclude set-off entirely, which is why such clauses appear in payment terms. Whether an exclusion clause of that kind is effective depends on local law and on the nature of the contract.

Why the distinction matters commercially

A party with a valid set-off may lawfully withhold payment, whereas one with only a counterclaim generally may not. Withholding payment on a mistaken belief in a set-off can itself amount to a breach with serious consequences.

On the face of the agreement, in insolvency contexts the availability of set-off becomes extremely important and is governed by specific rules. Those rules differ between systems and may operate automatically rather than at the parties' election. This is a technical area where the consequences of misjudging the position are disproportionately severe.

Bringing a counterclaim

A counterclaim is usually filed with the defence and must satisfy the same requirements as any claim. It may attract its own fee, and the party bringing it takes on the burden of proving it.

Read strictly, it also exposes that party to costs consequences if the counterclaim fails while the main claim succeeds. Limitation periods apply to counterclaims, though some systems have special rules where the claim was brought first.

The procedural details differ, and filing late or in the wrong form can waste an otherwise good claim.

Strategic realities

Counterclaims are sometimes raised primarily to create leverage rather than because recovery is genuinely expected. Courts and opponents recognise this pattern, and weak counterclaims can damage credibility on the main issues.

For most everyday situations, a genuine counterclaim, conversely, changes the settlement dynamic substantially and often produces a negotiated outcome. It can also affect which party is effectively the claimant, with consequences for how the case is presented. Assessing whether to bring one is a judgement requiring knowledge of local procedure and costs rules.

Limitation periods are short and unforgiving, which is why proper advice is worth taking early rather than after reading around.

Where these arguments arise

Construction, supply and professional services disputes generate most of them, since performance and payment are intertwined. A claim for an unpaid invoice met by an allegation of defective work is the standard pattern.

Landlord and tenant disputes produce a similar structure where arrears meet allegations of disrepair. Whether disrepair can be set against rent is treated very differently across jurisdictions and is often restricted. Anybody considering withholding payment on this basis should take advice from a qualified lawyer locally before doing so.

The takeaway

Reducing what you owe and claiming something back are different moves with different risks. General information rather than legal advice.

Most disputes are settled by whoever kept the better record.