What is Joint and Several Liability?

The default position is that co-debtors are each liable for an equal share. Joint and several liability is the exception, though a more common exception than most business owners expect. It arises where legislation provides for it, where the parties agree it, or where the obligation cannot sensibly be split.

The effect runs one way, in the creditor's favour. If three parties work on a project together and something goes wrong, the client does not need to establish who caused which part of the failure. The client pursues whichever party offers the best prospect of recovery, and in practice that is the party with the strongest balance sheet or the best insurance, not necessarily the party at fault.

Whoever pays then starts a second process. A right of recourse gives them a claim against the other debtors for their respective shares. Those shares follow from the internal relationship between the parties, and that is where the difficulty begins: if the internal split was never documented, it gets determined after the event. If one of the others has become insolvent in the meantime, the paying party absorbs that share. Joint and several liability therefore shifts not only the collection risk but also the insolvency risk away from the creditor and onto the debtors.

In contracts it surfaces in three places. In consortium and joint venture arrangements, where the client routinely requires every participant to be liable for the whole engagement. In group structures, where a parent company binds itself alongside its subsidiary. And on contract transfer, where the outgoing party often remains jointly bound for performance by the incoming one.

For a smaller business joining as the minority participant, that is where the exposure becomes disproportionate. A party taking a 15 percent share in an EUR 800,000 project signs for the whole of it under a joint and several clause. An internal split agreed between the participants changes nothing towards the client, because the liability operates externally. What it does determine is whether you ever recover what you paid.

The practical limit is therefore rarely deletion of the clause, which a serious client will not accept. It lies in three other provisions: a liability cap drafted to apply expressly to the joint and several obligation, a written contribution agreement between the participants, and security from your co-debtors for their share in the form of a bank guarantee or a parent company guarantee.

Joint and several liability is a risk that lives entirely in the drafting and nowhere in the price. It occupies a single sentence, changes nothing about the work you actually perform, and multiplies the amount you can be pursued for.

That makes it exactly the kind of provision that gets lost in version control. Ironclad (2025) finds that 92 percent of contract management errors are human errors rather than defects in the agreements themselves. A joint and several clause removed in the first draft and quietly restored in the third is precisely that kind of error.

For SMEs there is a second point about scale. The clause makes the smallest participant in a project as exposed as the largest, while its balance sheet cannot absorb the same loss. Before countersigning, the question worth asking is whether the maximum amount you can be pursued for bears any relation to what the engagement earns you.