Learn the difference between a deed poll, statutory declaration and affidavit in the UK, what each legal document does, and when you may need one.
If you have ever been asked to provide a deed poll, statutory declaration or affidavit, it is understandable to wonder whether they are simply different names for the same type of legal document.
They are not.
Although all three can be important legal documents, they serve very different purposes. A deed poll is most commonly used to provide evidence of a change of name. A statutory declaration is a formal statement declaring that certain facts are true. An affidavit is a written statement that is sworn or affirmed to be true and is commonly associated with evidence in legal proceedings.
Understanding the difference between a deed poll, statutory declaration and affidavit matters because providing the wrong document can delay an application, name change, legal procedure or administrative request.
This guide explains each document in straightforward language, how they differ, when they may be required and which one may be appropriate for your situation.
Important: This article provides general information, mainly in the context of England and Wales, and is not individual legal advice. Different procedures may apply in Scotland, Northern Ireland or for particular legal proceedings.
The easiest way to understand the difference is to look at what each document is designed to accomplish.
Document | Main Purpose | Typical Situation |
|---|---|---|
Deed Poll | Records and provides evidence of a change of name | Changing your first name, surname or other part of your name |
Statutory Declaration | Formally declares that specified facts are true | Confirming facts where a formal legal declaration is required |
Affidavit | Provides sworn or affirmed written evidence | Court proceedings and other situations requiring sworn evidence |
GOV.UK describes a deed poll as a legal document that proves a change of name. HM Courts & Tribunals Service describes an affidavit as a formal written statement setting out facts for use as evidence in legal proceedings. Statutory declarations, meanwhile, are governed principally by the Statutory Declarations Act 1835 and are used to formally declare facts to be true.
So, although the documents can occasionally appear within the same legal or administrative process, their functions should not be confused.
A deed poll is a legal document used as evidence that someone has changed their name.
According to current GOV.UK guidance, a person can use a deed poll to change any part of their name, including adding or removing names, changing spelling or adding or removing a hyphen, subject to certain restrictions.
For example, somebody named:
Daniel James Thompson
might decide to become:
Daniel James Carter
A deed poll creates documentary evidence of that change and can then be presented to organisations when updating records.
These might include organisations holding your banking, employment, education or other personal records, although individual organisations can set their own evidence requirements.
One important distinction is between an unenrolled deed poll and an enrolled deed poll.
Current GOV.UK guidance states that a person aged 16 or over can make an unenrolled deed poll and start using a new name. A person aged 18 or over may apply to place their name change on public record through the High Court, creating what is known as an enrolled deed poll.
An unenrolled deed poll can therefore be a perfectly valid way of documenting a name change without enrolling the change with the High Court.
However, GOV.UK advises checking what evidence an organisation will accept, because some organisations may request an enrolled deed poll.
In simple terms, the person changing their name declares that they:
have given up their previous name;
have adopted their new name; and
intend to use the new name for their purposes going forward.
For a GOV.UK-style unenrolled deed poll, the document is executed as a deed with witnesses. Current government guidance says two witnesses aged 18 or over are needed for the DIY unenrolled deed poll described on GOV.UK.
The important point is that the primary purpose of a deed poll is the name change itself.
That is what separates a deed poll from a statutory declaration or affidavit.
A statutory declaration is a written statement in which a person formally declares that specified information is true.
In England and Wales, statutory declarations have their foundation in the Statutory Declarations Act 1835.
Rather than creating a name change in the same way as a deed poll, a statutory declaration generally provides formal confirmation of facts.
Imagine, for example, that an organisation requires you to formally confirm a particular fact and ordinary supporting documents are insufficient. It might request a statutory declaration.
The declaration contains the facts being confirmed and appropriate declaration wording. It must then be made before a person authorised to witness or administer the declaration.
HM Passport Office guidance lists authorised people who may witness statutory declarations in relevant circumstances, including solicitors, notaries public, justices of the peace and commissioners for oaths.
The precise requirements can depend on the purpose for which the declaration is being made.
No.
This is an especially important distinction when discussing deed poll vs statutory declaration.
A deed poll is principally evidence of a person's change of name.
A statutory declaration formally confirms facts.
There can, however, be some overlap in name-change procedures.
For example, current government guidance for an adult enrolled deed poll application includes a statutory declaration process. The relevant declaration must be completed and sworn or affirmed in front of an authorised person, such as a solicitor, commissioner for oaths or an appropriate court officer.
This does not mean a deed poll and statutory declaration are the same document.
Instead, it demonstrates how one legal process can involve more than one type of document.
Think of it this way:
Deed poll = the name-change document.
Statutory declaration = a formal declaration confirming specified facts.
An affidavit is a formal written statement in which a person gives evidence and swears or affirms that the contents are true.
HM Courts & Tribunals Service describes an affidavit as a formal written statement setting out the facts of a case for use as evidence in legal proceedings.
The person making an affidavit is traditionally known as the deponent.
Unlike an ordinary signed statement, an affidavit normally involves the person swearing an oath or making a non-religious affirmation.
HMCTS confirms that an affirmation has the same legal effect as an oath and that affidavits may be sworn or affirmed before appropriately authorised people such as a solicitor, notary, commissioner for oaths or authorised court staff, depending on the circumstances.
Yes, although an affidavit is not required for every piece of written evidence.
For example, the Family Procedure Rules state that evidence must be given by affidavit instead of, or in addition to, a witness statement where the court, another rule, a practice direction or legislation requires it.
This illustrates an important point about affidavit vs statutory declaration:
An affidavit is particularly associated with evidence.
A statutory declaration is particularly associated with formally declaring facts where a statutory or administrative procedure requires it.
The exact document required should therefore always be checked against the relevant application's instructions, court rules or request from the organisation concerned.
This is one of the most common areas of confusion.
Both documents involve someone formally confirming that information is true. Both may need to be completed before an authorised person. Both also carry serious consequences if deliberately false information is provided.
However, their legal context and purpose are different.
A statutory declaration is generally used when a person must formally declare facts under a statutory or administrative procedure.
Its legal basis includes the Statutory Declarations Act 1835, and particular procedures may specify exactly what wording and witnessing requirements must be followed.
An affidavit is a sworn or affirmed written statement of evidence.
It is particularly associated with legal proceedings and situations in which sworn written evidence is specifically required.
A simple way to remember the distinction is:
Statutory declaration = “I formally declare these facts to be true.”
Affidavit = “I swear or affirm that this written evidence is true.”
That explanation is simplified, but it captures the practical difference for most members of the public.
A deed poll and affidavit have even more clearly separated purposes.
A deed poll is primarily associated with changing a person's name.
An affidavit is primarily a form of sworn or affirmed written evidence.
If your objective is simply:
“I want to formally change my name and obtain evidence of that change,”
a deed poll is normally the document you would investigate.
If your situation is:
“A court or legal procedure has specifically instructed me to provide sworn evidence,”
an affidavit may be required.
You should not create an affidavit simply because it sounds more formal than a deed poll. Use the document required for the particular legal purpose.
Statutory declarations can be relevant to name-change evidence in some circumstances.
HM Passport Office's current caseworker guidance discusses statutory declarations as evidence relating to name changes and also separately discusses affidavits.
However, this does not mean that everybody changing their name should automatically choose a statutory declaration instead of a deed poll.
For most people specifically researching how to change their name by deed poll, the deed poll process remains the relevant starting point.
GOV.UK expressly describes a deed poll as the legal document proving a change of name.
What matters is the requirement of the organisation that needs evidence.
Before preparing any legal document, ask:
“What exact form of evidence does the organisation require?”
That simple question can prevent unnecessary costs and delays.
If you are unsure whether you need a deed poll, statutory declaration or affidavit, start with the purpose of the document.
A deed poll is generally the document most directly associated with demonstrating your change of name.
You may need a statutory declaration, especially where the relevant legislation, application form, authority or organisation specifically requests one.
You may need an affidavit, particularly where a court, rule or legal procedure specifically requires affidavit evidence.
Do not rely solely on the document's name. Read the instructions provided by the organisation requesting it.
The answer depends on both the document and the circumstances.
GOV.UK specifically provides instructions for people aged 16 or over who wish to make their own unenrolled deed poll. It also notes that a specialist agency or solicitor can prepare one.
Statutory declarations and affidavits are different because their formal execution requirements usually involve an appropriately authorised independent person.
For example, HMCTS states that its general affidavit form must be sworn or affirmed and identifies solicitors, notaries, commissioners for oaths and authorised court staff among those who may perform this role in appropriate circumstances.
Similarly, official guidance relating to statutory declarations identifies authorised witnesses and specifies formal declaration requirements.
If an organisation or court has supplied a particular form, use the required form rather than creating your own version from an online example.
Not necessarily for every deed poll.
GOV.UK expressly provides a process for making your own unenrolled deed poll, although it also advises checking whether the organisation you are dealing with will accept the document.
A statutory declaration or affidavit usually requires involvement from someone legally authorised to administer or witness the relevant declaration, oath or affirmation.
That authorised person may be a solicitor, but depending on the document and circumstances, another authorised official may be permitted.
Always check the requirements applying to your particular document before arranging an appointment.
Legal terminology can make a statutory declaration, affidavit and deed poll appear more similar than they really are.
Choosing the right document matters because each performs a particular function.
Using an affidavit when a deed poll has been requested does not necessarily satisfy the recipient.
Likewise, producing a deed poll when a court specifically requires affidavit evidence is unlikely to fulfil the court's evidential requirement.
Civil Procedure guidance also makes clear that documents such as affidavits and witness statements must comply with applicable procedural requirements, and a court may refuse defective evidence in relevant circumstances.
The safest practical approach is therefore to check:
Why is the document required?
Who is requesting it?
Does that organisation specify a particular form?
Who must witness, swear or affirm it?
Are there any supporting documents required?
To summarise the difference between a deed poll, statutory declaration and affidavit:
Primarily used to provide legal documentary evidence that a person has changed their name.
A formal written declaration that specified facts are true, made according to the applicable statutory requirements.
A written statement of evidence that is sworn or affirmed to be true and may be required in particular legal proceedings or procedures.
Although all three documents involve formal legal statements, their purpose determines which one you need.
No. A deed poll is primarily a document evidencing a change of name, while a statutory declaration is a formal declaration that specified facts are true. A statutory declaration may, however, form part of certain deed poll procedures, including aspects of the enrolled deed poll process.
A statutory declaration formally declares facts to be true under the relevant statutory framework. An affidavit is sworn or affirmed written evidence, often used where a court or legal process specifically requires affidavit evidence.
It is generally not useful to describe one as simply “stronger” than the other. They have different purposes and procedural requirements. The correct question is which document the relevant court, authority or organisation requires.
You should use the form of evidence requested by the organisation concerned. HM Passport Office guidance recognises affidavits and statutory declarations in certain name-change evidence contexts, but GOV.UK specifically identifies a deed poll as a legal document proving a change of name.
Yes, where a statutory declaration is required it must be made in accordance with the applicable witnessing and declaration requirements. Depending on the procedure, authorised people can include solicitors, notaries public, justices of the peace, commissioners for oaths or certain other authorised officials.
An affidavit is sworn on oath or made by affirmation. HMCTS explains that an affirmation is a non-religious alternative with the same legal effect as an oath.
Current GOV.UK guidance says that someone aged 16 or over can make their own unenrolled deed poll. You should nevertheless check whether the particular organisation updating your records has its own evidence requirements. Different rules apply to people born in Scotland.
For someone specifically seeking documentary evidence of a change of name, a deed poll is usually the most directly relevant document. GOV.UK states that a deed poll is a legal document proving a change of name.
At first glance, a deed poll, statutory declaration and affidavit can all look like formal documents involving signatures, witnesses and statements of fact. Their legal purposes, however, are quite different.
A deed poll is principally about documenting your change of name.
A statutory declaration formally confirms facts.
An affidavit provides sworn or affirmed written evidence and is often connected with legal proceedings or other procedures specifically requiring an affidavit.
If you are deciding between a deed poll vs statutory declaration, or trying to understand the difference between a statutory declaration and affidavit, focus first on what you are trying to achieve and exactly what evidence the receiving organisation requires.
When changing your name, also check the evidence requirements of the organisations whose records you intend to update. GOV.UK specifically advises people making an unenrolled deed poll to check whether an organisation will accept it or whether it has different requirements.
Getting the document right at the beginning can make the process much simpler.
