WHAT IS AN AFFIDAVIT?
An affidavit is a written statement of fact, made voluntarily, sworn or affirmed before an officer authorized to administer oaths, and signed by the person making it. The person who makes it is the affiant. The officer’s certificate at the bottom, reciting that the affiant appeared and swore to the contents, is called the jurat. Strip away any one of these elements and the document is something else. Without the oath it is a statement. Without the jurat it is unverified. Without personal knowledge it is speculation dressed in formal clothing.
The word comes from Medieval Latin. Affidavit is the third person singular perfect of affidare, meaning he has pledged his faith, built from ad and fides. The English legal usage dates to the sixteenth century, and the grammar tells you what the instrument was originally understood to be. It is not a statement of what happened. It is a record that a person pledged his faith to what he said.
The instrument came into English practice through the ecclesiastical and chancery courts rather than the common law side. Common law trials were oral. A jury sat, witnesses appeared, and proof came in viva voce under the eye of the opposing party. Chancery had no jury. The chancellor decided facts himself, and proof reached him on paper, through sworn answers to the bill and written depositions taken by examiners. When a party needed emergency relief, an injunction or a writ of ne exeat, there was no time for that machinery, and the affidavit filled the gap. It was the sworn paper a chancellor could act on immediately.
That origin explains the division that still governs today. The common law courts allowed affidavits, but confined them to collateral and procedural matters: bail, proof of service, applications for continuance, motions of every kind. On the merits, the witness had to appear. When law and equity merged in the nineteenth century, through the Field Code in New York and the Judicature Acts in England, the affidavit carried forward into unified procedure with that same limitation attached. It is why an affidavit today supports a summary judgment motion, Tex. R. Civ. P. 166a(f), or a temporary restraining order, Tex. R. Civ. P. 680, but is inadmissible hearsay if offered as substantive proof at trial. Tex. R. Evid. 801, 802.
One distinction from that era is still worth knowing. A deposition in the old chancery sense was taken on written interrogatories with notice to the adverse party, who could cross-examine. An affidavit was ex parte. The affiant swore to it alone, and the other side had no opportunity to test it. Courts have always treated affidavits with corresponding caution for exactly that reason, and the caution survives in the modern rule that an affidavit cannot substitute for live testimony where the merits are at stake.
Texas inherited the blended system rather than the divided one. The Republic adopted the common law of England as the rule of decision in 1840 while retaining equitable remedies in the same courts, so Texas never developed separate courts of law and chancery, and the affidavit appears in Texas practice from the beginning as a general-purpose supporting instrument. It appears throughout the current rules: verified pleas, Tex. R. Civ. P. 93; sworn accounts, Tex. R. Civ. P. 185; continuances, Tex. R. Civ. P. 251, 252; motions for new trial on jury misconduct, Tex. R. Civ. P. 327.
Two modern developments have reshaped the affidavit’s role. The first is the sharpening of the personal knowledge requirement, which has made the conclusory affidavit a nullity rather than merely a weak filing. Brownlee v. Brownlee, 665 S.W.2d 111, 112 (Tex. 1984). The second is the rise of the unsworn declaration. Tex. Civ. Prac. & Rem. Code § 132.001 now permits an unsworn declaration, made in writing and subscribed as true under penalty of perjury, in place of a written sworn declaration, verification, or affidavit, subject to the exceptions in subsection (b) and the form prescribed in subsection (d). The federal analogue is 28 U.S.C. § 1746. The practical effect is that a notary is no longer required for most purposes, which removes the last purely ceremonial element of a very old instrument and leaves only what always mattered: a person, with knowledge, accepting the penalty of perjury for what he says.
What Belongs in an Affidavit, and What Does Not
An affidavit is evidence. It is not argument. A court reads a sworn statement the same way it would listen to a witness on the stand, which means the affiant may state only what he personally saw, heard, did, or knows, and only what would be admissible if he said it from the witness chair. Rule 166a(f) of the Texas Rules of Civil Procedure states the standard directly: an affidavit must be made on personal knowledge, must set forth facts that would be admissible in evidence, and must affirmatively show that the affiant is competent to testify to the matters stated.
The most common mistake is filling an affidavit with conclusions rather than facts. A statement like “sufficient cause exists for a continuance” or “the witness’s testimony is material” or “no prejudice will result” is not evidence. It is the conclusion a judge is supposed to reach after reading the evidence. Texas courts call these statements conclusory, and a conclusory affidavit has no probative value at all. It is not merely weak. It proves nothing, and the defect can be raised for the first time on appeal because it is a substantive failure rather than a formal one. See Brownlee v. Brownlee, 665 S.W.2d 111, 112 (Tex. 1984); Ryland Group, Inc. V. Hood, 924 S.W.2d 120, 122 (Tex. 1996) (per curiam); Anderson v. Snider, 808 S.W.2d 54, 55 (Tex. 1991) (per curiam). Swearing to a conclusion also does not cure the problem. An affiant who says “I have personal knowledge that the contract was breached” has still stated a legal conclusion, because whether conduct amounts to a breach is a question for the court, not for the witness.
The reliable test is to ask whether the affiant could testify to the statement at trial without being sustained on an objection. “I mailed the notice on March 3” is a fact. “Notice was properly given” is a conclusion. “I was present in the warehouse and saw the forklift strike the shelving” is a fact. “The defendant was negligent” is a conclusion. “I received the file from prior counsel on May 12, and it did not contain the deposition transcripts” is a fact. “I have not had adequate time to prepare” is a conclusion.
This does not mean an affidavit is limited to physical observation. A person has personal knowledge of his own intent and state of mind, and may swear to it. Tex. R. Evid. 701. That is why Rule 252 requires a party seeking a continuance because of an absent witness to swear that the continuance is not sought for delay only, but so that justice may be done. A statement of purpose is a fact about the affiant. A statement about whether the law entitles him to relief is not.
The practical arrangement is a division of labor across three documents. The affidavit supplies the facts. The motion states the legal characterization of those facts and the relief requested. The brief or the argument section supplies the authority and the reasoning connecting them. When a filing collapses these into one sworn document, the affidavit becomes vulnerable to objection and the motion loses its evidentiary foundation. When they are kept separate, the affiant can be cross-examined only on what he actually knows, and the legal argument stands on its own where it belongs.
An Affidavit Does Not Move the Court
An affidavit asks for nothing. It is a container for facts, and standing alone it presents a judge with no request to grant and no order to sign. Texas Rule of Civil Procedure 21 states the rule plainly: an application to the court for an order must be in writing, must state the grounds, and must state the relief sought. That is a motion. The affidavit is what a motion rests on, not what a court acts on. A sworn statement filed by itself, however well drafted and however thoroughly notarized, produces no ruling, because nothing in it asks the court to do anything.
This matters because of a persistent theory circulating outside the courts, usually phrased as the claim that an unrebutted affidavit stands as truth, or that silence in the face of a sworn statement operates as agreement or default. It does not. No Texas rule or statute makes a party’s failure to answer a mailed affidavit into an admission, an estoppel, or a judgment. Admissions in litigation come from two places. A party may make a judicial admission in a live pleading, or a party may be deemed to admit a matter by failing to answer requests for admission properly served in a pending case under Tex. R. Civ. P. 198. Both require a lawsuit already on file and service under the rules. Neither can be manufactured by mailing a document to someone who has never been sued.
Notarization does not close the gap. A notary’s function under Tex. Gov’t Code § 406.016 is to administer the oath and verify the identity of the person signing. The notary certifies that a known person appeared and swore to the document. The notary certifies nothing about whether the contents are true, and a notary is expressly forbidden to give legal advice. A notarized falsehood is still a falsehood, with the added feature that the affiant has now sworn to it.
Even a properly drafted affidavit has limited reach. It is an out of court statement, and outside the specific contexts where a rule permits its use, such as summary judgment under Tex. R. Civ. P. 166a or a temporary restraining order under Tex. R. Civ. P. 680, it is hearsay at trial and inadmissible as substantive proof. Tex. R. Evid. 801, 802. The witness must appear and testify, subject to cross examination.
The practical rule is short. If you want a court to act, file a motion or a petition that states what you want and why you are entitled to it, and attach the affidavit as the evidence supporting it. The pleading invokes the court’s authority. The affidavit supplies the proof. An affidavit filed without either one is a document in search of a case.