No Win No Fee and Contingency Fees, Explained for the US and the UK

"No win no fee" is a broad term for legal funding arrangements where a client does not pay their lawyer's professional fees unless their case succeeds. It exists in various forms across common-law jurisdictions worldwide, but the two most developed systems are in the United States and the United Kingdom.

In the United States, this is known as a contingency fee agreement. The attorney agrees to represent the client in exchange for a percentage of the damages recovered — most commonly around one third, and often more if the case is filed or tried. If the case is lost, the attorney receives no fee, though the client may still be responsible for case costs such as court filing fees and expert witness charges.

In the United Kingdom, the equivalent arrangement is a Conditional Fee Agreement (CFA). Under a CFA, the solicitor charges their normal base costs plus a "success fee" — an uplift of up to 100% of those costs — only if the case wins. Separately, in personal injury claims, no more than 25% of your damages may be taken — calculated on general damages for pain, suffering and loss of amenity plus past financial loss, but not future financial loss, and after deducting benefits recoverable by the Compensation Recovery Unit. The UK also permits Damages-Based Agreements (DBAs), which work more like US contingency fees.

Both systems exist to ensure access to justice for people who cannot afford to pay legal fees upfront. However, the rules, regulations, caps, and cost consequences differ significantly between — and even within — each country.