Notary glossary
Declaration vs Affidavit
Both are written statements of fact that you sign, and both carry a perjury penalty if you lie. The difference that matters in practice is who has to be in the room: an affidavit is sworn in front of a notary, who administers an oath and completes a jurat. A declaration is simply signed by you under penalty of perjury, with no notary involved.
The practical test
Look at the block of text immediately above the signature line. If it says you declare under penalty of perjury that the foregoing is true and correct, and there is nowhere for a notary to sign, you have a declaration and you can sign it yourself.
If there is a notarial certificate underneath, a block beginning "Sworn to and subscribed before me" with space for a seal, commission number and date, you have an affidavit, and you need a notary to complete it.
Why declarations exist
Requiring a notary for every sworn statement is friction, and for a long time it was unavoidable. Federal law now lets most unsworn declarations substitute for an affidavit in federal matters, provided the statement is dated and signed under penalty of perjury, and the great majority of states have adopted a version of the same rule.
The substitution is not universal. Some filings still demand a notarized affidavit by statute, and many institutions require one as a matter of their own policy even where the law would allow a declaration.
Where an affidavit is still required
The pattern is that the more a filing touches property or the public record, the more likely it is that a notarized affidavit is demanded. Anything recorded with a county: deeds, liens, construction notices, owner-builder paperwork, is routinely in this category, because the recorder needs independent proof that the person named actually appeared.
Probate and estate filings, many insurance claims, immigration-related statements and most city permit affidavits follow the same rule. Court rules vary by jurisdiction and by document, so the safest assumption with anything being filed is that the form itself is authoritative: if it carries a notarial certificate, complete it.
Both carry the same perjury exposure
A declaration is not the casual option. Signing one that you know to be false is perjury in the same way that lying in a sworn affidavit is, and the penalty does not soften because no notary was present. The oath changes the procedure, not the consequences.
What the notary adds is evidence: an independent record that you personally appeared, were identified to the state's standard, and swore to the contents on a particular day. That is what makes an affidavit harder to disown later, and it is why courts and recorders ask for one.
If you are not sure which you have
Ask the receiving party rather than guessing, because the cost of the two mistakes is asymmetric. Filing a declaration where an affidavit was required usually means doing it again on their timetable. Having a declaration notarized when it was unnecessary costs you a short appointment and nothing else.
When the form has a notarial certificate on it and you are still unsure, treat it as an affidavit. The certificate is there because somebody expected it to be completed.
Common questions
Does a declaration need to be notarized?
Usually not. A declaration is signed under penalty of perjury and is complete without a notary. If the form has a notarial certificate on it, a block for the notary to sign and seal, then it is functioning as an affidavit and does need one.
Is a declaration as strong as an affidavit?
Legally the perjury exposure is the same. The difference is evidentiary: an affidavit carries a notary's record that you appeared, were identified and swore to the contents, which is harder to dispute later. That is why some filings and institutions insist on one.
Can I turn a declaration into an affidavit?
Yes, if the receiving party will accept it. You add a jurat certificate and sign in front of a notary, who administers the oath and completes the certificate. Ask them first: some want their own form used rather than one you have amended.
Related terms
Affidavit
A written statement of facts that the signer swears or affirms is true in front of a notary. City permit packets are full of them: owner-builder affidavits, roofing affidavits, survey affidavits. An affidavit needs a jurat, not an acknowledgment.
Affiant
The person who signs an affidavit and swears or affirms that its contents are true.
Sworn statement
Any statement made under oath or affirmation. An affidavit is a sworn statement in writing.
Jurat
A notarial act where you sign the document in the notary's presence and swear or affirm that its contents are true. The certificate reads "sworn to (or affirmed) and subscribed before me". Affidavits and sworn applications use a jurat.
General notary practice, not legal advice, rules on identification, witnesses and which documents may be notarized online are set by each state. See the requirements page for your state, or browse the full notary glossary.
The notary guides cover where to get a document notarized and what each option will and will not handle, the FAQs explain how a session runs, and the document guides cover specific paperwork. When you are ready, start a session.