A document may need to be signed urgently, but the person witnessing it must have the right authority for its destination. That is where the question of notary public versus commissioner oaths matters. Choosing the wrong service can lead to a rejected document, missed transaction deadline, or the need to repeat the process abroad.
For many documents used solely in England and Wales, a Commissioner for Oaths may be sufficient. For documents going overseas, a notary public is usually the appropriate professional. The precise answer depends on the document, the purpose of the signing, and the requirements of the receiving authority or country.
What does a Commissioner for Oaths do?
A Commissioner for Oaths is authorised to administer oaths and take affidavits, statutory declarations and affirmations. In practice, many practising solicitors in England and Wales can act in this capacity. Their role is particularly relevant where someone must formally confirm that a statement is true.
An oath is a sworn statement made before an authorised person. An affirmation has the same legal effect but is used by a person who does not wish to swear a religious oath. A statutory declaration is a formal written statement of fact, usually made under the Statutory Declarations Act 1835.
Typical examples include a declaration for a UK legal process, an affidavit required in civil proceedings, or a statement supporting an application to a British organisation. The Commissioner checks the signatory’s identity, ensures the document is signed in their presence, administers the oath or affirmation where required, and completes the relevant jurat or attestation.
This is a focused domestic function. It does not generally involve authenticating documents for use by foreign courts, overseas banks, embassies, registries or property authorities.
What does a notary public do?
A notary public is a specialist legal professional whose authority is recognised internationally. In England and Wales, notaries are appointed through the Faculty Office of the Archbishop of Canterbury and are regulated professionals with duties that extend beyond witnessing a signature.
A notary can verify identity and legal capacity, witness execution, certify copies, prepare or authenticate documents, and apply an official signature and seal. Depending on the matter, the notary may also need to check company records, confirm a director’s authority, review the wording required by the overseas recipient, or retain a detailed notarial record.
This higher level of verification is why notarial documents are commonly requested for overseas property purchases, foreign company matters, immigration files, powers of attorney, educational records, shipping papers and international banking requirements.
A notary’s work may also be the first step in legalisation. If a foreign authority requires an apostille, the notary’s signature is submitted for authentication by the Foreign, Commonwealth & Development Office. Some countries require a further stage of consular legalisation after the apostille. A Commissioner for Oaths cannot usually provide the notarial signature and seal needed for that process.
Notary public versus commissioner oaths: the practical difference
The central distinction is purpose. A Commissioner for Oaths assists with sworn or affirmed statements, usually for domestic use. A notary public authenticates documents for use across borders and carries an internationally recognised official seal.
The difference is not simply a matter of cost or appointment availability. It is about whether the receiving organisation can rely on the certification. A foreign land registry may need assurance that the person signing a power of attorney has been properly identified and has signed voluntarily. An overseas bank may require a notarised corporate resolution before it will accept instructions from a UK company. A local Commissioner for Oaths stamp is unlikely to meet those requirements.
Conversely, asking for notarisation when a UK organisation only needs a statutory declaration may add unnecessary time and expense. The wording of the request is useful, but it should not be accepted uncritically. Organisations sometimes use terms such as “notarised”, “certified” and “witnessed” loosely. Where possible, obtain written confirmation of exactly what is required before arranging an appointment.
When a Commissioner for Oaths may be enough
A Commissioner for Oaths may be suitable where the document is for use in England and Wales and specifically requires an affidavit, oath, affirmation or statutory declaration. Examples can include statements for UK court proceedings, certain probate-related declarations, or evidence requested by a domestic institution.
Even then, the form of the document matters. Some declarations have prescribed wording, and some bodies require the declaration to be made before a particular category of person. Do not sign the document in advance unless you have been told that this is permitted. For an oath, affidavit or declaration, the signature is normally made in the authorised person’s presence.
When you are likely to need a notary
You will normally need a notary public where the document is to be presented outside the UK, particularly if it concerns legal authority, identity, a corporate decision or an official record. Common examples include a power of attorney for overseas property, a travel consent for a child, foreign marriage documentation, a certified passport copy, a university certificate, company incorporation documents and a board resolution for an overseas bank.
Notarisation is also commonly required where an overseas lawyer, government department, consulate, court or registry has requested a notarial certificate, notarial seal, apostille or legalisation. The destination country’s rules take priority. A document accepted in Spain may require different formalities in the United Arab Emirates, China, the United States or another jurisdiction.
Certification, notarisation and legalisation are separate stages
These terms are often used interchangeably, but they describe different services. A certified copy confirms that a copy matches the original seen by the certifier. Notarisation involves a notary’s formal verification and certification. Legalisation confirms the authenticity of the notary’s signature or, in some cases, another public official’s signature for international acceptance.
One document may require all three stages. For example, a university degree may need a certified copy, notarial certification, an apostille and then embassy legalisation. Another document may need only a notarially certified copy. A UK affidavit may require neither.
The original document should be checked before any work begins. Foreign authorities can be strict about translation, dates, names, company details, photographs, seals and the order in which legalisation steps are completed. Correcting an error after an apostille or consular submission can cause delay and additional fees.
Preparing for the appointment
The quickest way to establish the right service is to provide a clear scan of the document and the instructions from the receiving body. It is helpful to state the country of use, the deadline, whether an apostille or embassy legalisation has been requested, and whether you will be signing personally or for a company.
For an individual, valid photographic identification and proof of address are commonly required. A company signatory may need to provide incorporation details, current company information, board minutes or a resolution, and evidence that they have authority to sign. If the document is a power of attorney, the notary may need to consider capacity and whether the signing is voluntary.
Do not alter the document after it has been notarised. Even a small amendment may invalidate the certificate or require the document to be notarised again. If a translation is needed, ask whether the receiving authority requires the translator’s signature or the translation itself to be notarised.
Can this be done remotely?
Remote electronic notarisation can be useful when a client is abroad, travelling, housebound or working to a tight deadline. However, availability depends on the document type, identity checks, electronic-signature arrangements and, above all, the requirements of the country and organisation receiving the document.
Some authorities still require wet-ink signatures and a physical notarial seal. Others will accept an electronic notarial act if it follows their stated procedure. Remote convenience should never override the receiving authority’s rules. Confirming acceptance first prevents a document being refused simply because it was signed electronically.
For urgent international documents, M M Karim Notary Public London can assess the document, explain the likely notarial and legalisation route, and arrange an appointment in office, at a suitable location or remotely where appropriate.
The right question is not merely who can witness your signature. It is what level of authority the recipient needs to accept the document without delay. Establish that point before signing, and the process becomes clearer, faster and far less likely to need doing twice.