How to File a Motion to Amend by Interlineation

To file a motion to amend by interlineation, submit a short motion that names the pleading you want to correct, points to the exact page and line, shows the current and proposed language, attaches a marked-up copy of the affected page, and includes a proposed order for the judge to sign. Before you draft anything, though, check whether you need a motion at all. Federal Rule 15 lets you amend a pleading once without permission if you’re still inside the 21-day window, and opposing counsel’s written consent works in place of a court order after that.¹

Confirm You Actually Need the Motion

Under Rule 15(a), you can amend a pleading once as a matter of course, with no motion and no court approval, within 21 days of serving it. If the pleading requires a response, the window runs 21 days after the opposing party serves a responsive pleading or a Rule 12 motion, whichever comes first.¹ Inside that window, skip the motion and file the corrected pleading directly.

After the window closes, written consent from the opposing party is still enough. File a stipulation and the corrected document, no court order needed.¹ For a typo, most attorneys will agree. A quick email to opposing counsel before you draft anything can save the effort.

You need a motion only when both routes are closed: the amendment-as-of-right window has passed, and the other side won’t consent or can’t be reached.

When Interlineation Is the Right Tool

Interlineation is for corrections that don’t change the substance of your case. Fixing a misspelled party name, correcting a single wrong digit in a date, updating an address, or cleaning up a typographical error are the classic uses. The test is whether the change could surprise or disadvantage the opposing party. If it doesn’t alter the claims, defenses, or factual allegations in any meaningful way, interlineation fits.

Anything beyond cosmetic correction needs a formal amended pleading. Adding a claim, dropping or substituting a party, changing the legal theory, or introducing new factual allegations all fall outside the scope. Courts reject interlineation motions that overreach far more often than they penalize filers for being thorough, so when in doubt, file a full amended pleading instead.

What Courts Look At

Rule 15 directs courts to “freely give leave when justice so requires.”¹ The Supreme Court in Foman v. Davis identified the reasons a court might still refuse: undue delay, bad faith or dilatory motive, repeated failure to cure through earlier amendments, undue prejudice to the opposing party, or futility of the proposed amendment.² For a routine interlineation, these factors almost always cut in your favor. Courts push back when the “minor correction” quietly shifts the meaning of an allegation, or when a party sat on a known error for months and now wants to slip it in without the scrutiny a formal amendment would draw.

Drafting the Motion

Keep it short. A page or two is plenty. If your motion runs longer, you’re probably trying to do something that calls for a formal amendment. The court needs to see exactly what you want to change, where it sits in the document, and why interlineation is appropriate. Include:

The standard caption and case number used on every other filing in the case.
The specific document you want to correct, by title and filing date.
The precise location of the error: page, line, or paragraph. Precise enough that the judge can find it without hunting.
The exact current text and the exact proposed text.
A sentence or two confirming the change is clerical and does not alter the substance of the pleading.
A statement of whether you contacted the opposing party and whether they object. Many courts require this, and including it always helps the court rule faster.

The Marked-Up Exhibit

Attach the affected page or pages from the original filing with the interlineation shown visually. Strike through the text to be removed and underline the replacement. The redline lets the judge see the change at a glance. Some courts accept bold text for insertions in place of underlining, but strikethrough for deletions is essentially universal.

The Proposed Order

Most courts expect a proposed order with the motion. Keep it to one page. It should state that the court has reviewed the motion, grant leave to amend by interlineation, and direct the clerk to treat the corrected document as the operative pleading. Local rules will tell you whether a proposed order is required or merely encouraged; submitting one either way makes approval easier.

Filing and Serving

In federal court and most state courts, you’ll upload the motion, the marked-up exhibit, and the proposed order through the e-filing portal. The system typically confirms filing and serves opposing counsel automatically for parties registered on the system. If you’re in a court that still uses paper, follow local rules on paper size, margins, font, and spacing, which vary significantly.

You must serve the motion on every other party. Under Rule 5, a written motion goes to every party, and if a party has counsel, service goes to the attorney. Acceptable methods include hand delivery, mail, and electronic transmission through the court’s filing system or another method the recipient consented to in writing.³ An e-filing system that automatically notifies all parties satisfies the requirement.

After You File

The opposing party has time to respond, typically 14 to 21 days in federal court depending on the district’s local rules. For a genuinely minor correction, many opposing attorneys file a non-opposition or simply don’t respond, which signals the motion is uncontested.

The correction is not effective until the court enters an order granting the motion. Some judges rule on paper without a hearing when the change is obviously clerical and unopposed; others set a brief hearing. Once the order is signed, the original filing is treated as corrected, and the amended version supersedes the original for all future purposes.

Mistakes That Get These Motions Denied

Overreach is the most common problem. Parties sometimes try to use interlineation to slip in changes that go beyond a typo. Replacing “negligence” with “gross negligence,” adding a defendant’s name to an existing paragraph, or shifting a date to bring a claim within the statute of limitations are all substantive changes, and courts reject them when framed as interlineation. If the change alters the meaning of an allegation, it’s not clerical.

Delay is the next problem. Even for a small fix, filing months after you discovered the error, or on the eve of trial, invites the court to question your diligence. Courts that freely grant leave early in a case become much less receptive as trial approaches.² Fix errors as soon as you spot them.

The third issue is ignoring local rules. Courts often have specific requirements for how redline changes must be displayed, whether a declaration or affidavit is required, and whether a meet-and-confer statement must accompany the motion. A procedurally deficient motion gets rejected on technical grounds before the court reaches the substance. Check your district’s rules and the judge’s individual rules before filing.

State Courts Differ

Everything above is federal practice under the Federal Rules of Civil Procedure. State courts run on their own amendment rules, and they vary. Some track FRCP 15 closely; others follow different frameworks. A number of state and local courts have provisions expressly limiting interlineation to scrivener’s errors and typographical mistakes and prohibiting substantive use. The timeline for amending as of right, the standards for leave, and the formatting rules for marked-up documents all differ. Before filing in state court, review both the statewide rules of civil procedure and the local rules for your specific court.

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 15 – Amended and Supplemental Pleadings
2
Justia. Foman v. Davis, 371 U.S. 178 (1962)
3
Legal Information Institute. Federal Rules of Civil Procedure Rule 5 – Serving and Filing Pleadings and Other Papers