An affidavit can look deceptively straightforward: a written account, a signature and a formal declaration. Yet a missing jurat, an incorrectly marked exhibit or signing before the appointment can make the document unacceptable to a court, overseas authority, bank or consulate. Knowing how to prepare an affidavit in the UK means getting both the facts and the formalities right before it is sworn.

An affidavit is a written statement of facts that the person making it, known as the deponent, swears or affirms to be true. It may be required for litigation, probate, family matters, property transactions, immigration applications or overseas administrative processes. The receiving organisation’s instructions should always come first. Its wording, witnessing and legalisation requirements may be more specific than general UK practice.

Start by confirming what the recipient requires

Before drafting anything, establish whether an affidavit is genuinely required. In many situations, a statutory declaration, witness statement or simple signed letter is the correct document instead. These are not interchangeable. An affidavit is sworn on oath or affirmed, while a statutory declaration is made under a different formal procedure.

Ask the recipient whether it has a prescribed form and whether it needs original signatures, particular wording, supporting exhibits, notarisation, an apostille or consular legalisation. This is particularly important for documents intended for use outside the UK. A foreign court or registry may reject a perfectly well-drafted English affidavit if it has not been notarised or authenticated in the required way.

If the affidavit is connected with a live court case, use the relevant court rules and any directions from the court or solicitor handling the matter. Court proceedings can have strict rules on format, service and evidence. A notary can assist with the formal execution of an affidavit, but is not a substitute for litigation advice where the content affects a claim or defence.

Draft the affidavit as evidence, not argument

A strong affidavit is factual, precise and easy to follow. It should set out what the deponent personally knows, rather than opinions, assumptions or second-hand information. Where information comes from another person or a document, say so clearly and explain the source.

Begin with a heading that identifies the matter and recipient where appropriate. The opening should give the deponent’s full name, address, occupation and the capacity in which they are making the affidavit. For example, a company director should state their role and authority to speak for the company.

Use numbered paragraphs. Put events in date order where that helps, and include full names, dates, addresses, reference numbers and other identifying details. Avoid vague phrases such as “recently”, “a while ago” or “they agreed”. Replace them with information that can be checked.

The statement should be in the first person: “I entered into the agreement on 14 March 2026”, rather than “The agreement was entered into”. Keep the language measured. An affidavit is not the place to make accusations or add dramatic background that does not help prove the relevant facts.

A typical ending confirms the truth of the statement before the oath or affirmation is administered. The exact form of words depends on the jurisdiction, purpose and person before whom it is sworn. Do not copy a generic template blindly, especially when the affidavit is for a foreign authority.

Swearing an oath or making an affirmation

The deponent may swear an oath, usually referring to their faith, or make a secular affirmation. Both carry the same legal seriousness. The choice belongs to the deponent and should be made before the document is completed.

An affidavit must be signed in the presence of a person authorised to administer oaths, such as a solicitor, commissioner for oaths or notary public. The authorised person will complete the jurat, which records that the affidavit was sworn or affirmed before them, along with the date and place.

Do not sign the affidavit in advance. This is one of the most common and avoidable errors. Take the unsigned final version to the appointment, together with acceptable photographic identification and any documents referred to as exhibits.

Deal with exhibits carefully

An exhibit is a document attached to the affidavit and referred to within it, such as a passport copy, contract, email chain, certificate or company record. The affidavit should identify each exhibit clearly. For instance: “Shown to me and marked ‘AB1’ is a true copy of the agreement dated 14 March 2026.”

Each exhibit must be kept with the affidavit and marked in a way that matches the reference in the text. The authorised witness may need to sign or certify the exhibit sheet. If there are numerous documents, a schedule can make the bundle easier to review, but only include material that is relevant.

Original documents require particular care. Some organisations need to see originals but will accept certified copies within the affidavit bundle. Others require the original to be submitted separately. Confirm this before binding, scanning or sending anything away.

Choose the right person to witness it

For a UK-only matter, a solicitor or commissioner for oaths may be sufficient, depending on the recipient’s instructions. For an international affidavit, a notary public is often the safer choice because overseas authorities and consulates commonly expect a notarial act.

A notary will verify the deponent’s identity, capacity and understanding of the document, then witness the oath or affirmation and apply their seal. This creates a formal record that is more readily recognised abroad. It does not, however, automatically make the affidavit valid in every country. The next stage may be an apostille or legalisation through the relevant consulate.

The correct route depends on where the affidavit will be used. Countries that recognise apostilles may accept a notarised affidavit once it has been apostilled. Other countries may require further consular legalisation. Some recipients also require a certified translation. Planning this sequence early avoids urgent rework later.

Check identity, authority and capacity before the appointment

The deponent should bring a valid passport or photocard driving licence and proof of residential address, such as a recent bank statement or utility bill. The exact evidence needed can vary, particularly where the name or address on the affidavit differs from the identity documents.

Where a person signs for a company, partnership, charity or attorney, they should also bring documents showing their authority. This might include a board resolution, power of attorney, company records or constitutional documents. The person administering the oath must be satisfied that the individual understands the statement and has the authority they claim.

If the deponent does not speak English fluently, an interpreter may be needed. The affidavit should not be sworn until its contents have been properly explained and understood. A translated version may also be necessary for the final recipient. This is not simply an administrative detail: swearing a statement that the deponent cannot understand creates a serious evidential risk.

Avoid shortcuts with electronic signing and remote appointments

Electronic documents can be useful during drafting and review, but do not assume that an affidavit can be sworn by video call or completed with an electronic signature. Acceptance depends on the legal requirements of the relevant jurisdiction and, above all, the organisation receiving it.

For many affidavits, physical presence remains the appropriate and reliable route. Where remote online notarisation is available for a particular document and destination, the process must still meet the recipient’s requirements for identity verification, witnessing and electronic records. A quick check at the outset is far better than discovering that a consulate requires a wet-ink original.

A final pre-signing check

Read the completed affidavit slowly before the appointment. Check that names match identification exactly, dates follow a logical sequence, paragraph references are correct and every exhibit is present. Remove draft comments, blank spaces and tracked changes. Ensure the place and date of swearing are left for completion at the appointment.

For sensitive, urgent or international documents, professional review can save considerable time. White Horse Notaries can help clients prepare for the notarial stage, verify execution requirements and manage any apostille, legalisation or translation steps needed afterwards. The right affidavit is not merely signed correctly – it is prepared with the destination, evidence and formal process in mind.