Business Law · Haute Lawyer Network

What Happens in Discovery in a Business Lawsuit?

Last reviewed: October 2026 · Jurisdiction: United States (federal rules; state court and arbitration rules differ)

Discovery is the pretrial phase of a lawsuit in which each side must hand over the evidence the other side is entitled to see: documents, emails and other electronically stored information (ESI), written answers under oath, admissions and sworn deposition testimony. In federal court it starts after the parties' Rule 26(f) planning conference, opens with mandatory initial disclosures, and covers any non-privileged information relevant to a claim or defense and "proportional to the needs of the case." It is usually the longest and most expensive part of a business case, and what it turns up often decides whether the case settles. State courts and arbitration run on their own, often different, rules.

At a glance

Discovery tool	What it is	Federal default (FRCP)
Initial disclosures	Automatic exchange of witnesses, key documents/ESI, damages computation and insurance	Within 14 days after the Rule 26(f) conference (Rule 26(a)(1))
Document and ESI requests	Requests to produce documents, emails, data and things, or to inspect property	Written response due in 30 days (Rule 34)
Interrogatories	Written questions answered under oath	Up to 25 per party, including discrete subparts; 30 days to answer (Rule 33)
Requests for admission	Asks the other side to admit facts or the genuineness of documents	Deemed admitted if not answered within 30 days (Rule 36)
Depositions	Sworn, recorded questioning of a witness or company representative	10 per side without leave; 1 day of 7 hours each (Rule 30)
Subpoenas	Compel documents or testimony from non-parties	Geographic limits, generally within 100 miles (Rule 45(c))
Expert disclosures	Reports from retained experts	At least 90 days before trial unless the court orders otherwise (Rule 26(a)(2))

Source: Federal Rules of Civil Procedure 26, 30, 33, 34, 36 and 45 (Cornell LII), checked Oct. 25, 2026. Courts can change these defaults by order, and state rules differ.

What discovery is for

Federal Rule 1 says the rules should be applied to secure "the just, speedy, and inexpensive determination" of every action. Discovery serves that goal by letting each side test the other's story before trial instead of at it. Under Rule 26(b)(1), a party may obtain discovery of "any nonprivileged matter that is relevant to any party's claim or defense and proportional to the needs of the case." The information "need not be admissible in evidence to be discoverable."

Proportionality is the brake. Courts weigh six factors: the importance of the issues, the amount in controversy, the parties' relative access to the information, their resources, the importance of the discovery in resolving the issues, and whether the burden or expense outweighs the likely benefit.

How discovery unfolds in federal court

Preservation starts early. Rule 37(e) penalizes losing ESI "that should have been preserved in the anticipation or conduct of litigation," so a business should start preserving relevant documents and data, including email, chat and phone records, as soon as a lawsuit is anticipated. The Rule 26(f) conference specifically covers preservation.
The Rule 26(f) conference. The parties must confer at least 21 days before the scheduling conference (or before the scheduling order is due) and submit a written discovery plan within 14 days after. As a rule, formal discovery can't begin before this conference (Rule 26(d)(1)), although Rule 34 document requests may be delivered early, more than 21 days after service.
The scheduling order. The judge issues a scheduling order setting discovery deadlines, generally within the earlier of 90 days after any defendant is served or 60 days after any defendant appears (Rule 16(b)(2)).
Initial disclosures. Within 14 days after the 26(f) conference, each side identifies its witnesses and the documents and ESI it may use, computes its damages and discloses any insurance that may cover a judgment.
Written discovery. Document and ESI requests, interrogatories and requests for admission go back and forth, with 30-day response periods.
Depositions. Fact witnesses are deposed, often after documents are produced. A company can be required to designate someone to testify for it on listed topics (Rule 30(b)(6)), and the parties must confer about those topics first.
Experts. Expert reports and expert depositions usually come last.
Supplementing. Parties must supplement or correct disclosures and responses in a timely manner if they learn they are incomplete or incorrect in some material respect (Rule 26(e)).

Privilege, trade secrets and confidentiality

Privilege logs. A party that withholds documents as privileged must describe what it is withholding so the other side can assess the claim (Rule 26(b)(5)(A)). Since Dec. 1, 2025, the Rule 26(f) discovery plan and the scheduling order may address the timing and method for complying with this requirement, so privilege logs get discussed at the start of the case rather than fought over later.
Inadvertent production. If privileged material is produced by mistake, the producing party can notify the other side, which must return, sequester or destroy it (Rule 26(b)(5)(B)). A court order under Federal Rule of Evidence 502(d) can provide that disclosure connected with the case doesn't waive privilege.
Work product. Materials prepared in anticipation of litigation get protection under Rule 26(b)(3).
Protective orders. A court can limit discovery or set terms for confidential material, including trade secrets and confidential commercial information (Rule 26(c)(1)(G)). The party asking must certify it tried to resolve the dispute first.

Electronic discovery (ESI)

Most business discovery is electronic. Rule 34 lets the requesting party specify the form in which ESI should be produced. Under Rule 26(b)(2)(B), a party doesn't have to produce ESI from sources that are "not reasonably accessible because of undue burden or cost," but the court can still order it for good cause.

Losing data has consequences. Under Rule 37(e), if ESI that should have been preserved is lost because a party didn't take reasonable steps and it can't be restored or replaced, the court, on finding prejudice to the other side, may order measures "no greater than necessary to cure the prejudice." The harshest sanctions (an adverse-inference instruction, dismissal or default) require a finding that the party acted with intent to deprive the other side of the information.

When discovery fights reach the judge

Disputes are common. Before filing a motion to compel, a party must certify that it conferred in good faith to resolve the issue (Rule 37(a)). Judges can limit discovery that is unreasonably cumulative or duplicative, obtainable from a more convenient or less expensive source, or outside the proportional scope (Rule 26(b)(2)(C)). Rule 37 also provides sanctions for failing to comply with discovery orders.

How arbitration and state court differ

State court: each state has its own civil procedure rules, including its own limits on interrogatories, depositions and disclosures. Ask your lawyer which rules govern your case.
Arbitration: discovery is generally narrower and is set by the arbitration agreement, the provider's rules and the arbitrator. That is one reason businesses choose (or resist) arbitration. See Mediation vs. Arbitration vs. Litigation.
Rules keep changing: amendments to Civil Rules 26 and 45 (among others) are pending at the Supreme Court for Dec. 1, 2027. They are not in effect.

How business owners can prepare

Issue a written litigation hold as soon as a dispute looks likely, and suspend auto-delete on email, chat and phones.
Map where relevant data lives: email, shared drives, messaging apps, accounting systems, personal devices used for work.
Identify custodians, the people whose files matter, early.
Talk to counsel about privilege before you write about the dispute internally.
Expect your own executives to be deposed and to answer interrogatories under oath.
Ask for a confidentiality or protective order before producing trade secrets or sensitive financials.

Questions to ask a business litigator about discovery

Which rules govern discovery in my case: federal, state or an arbitration provider's?
What should we preserve today, and who should receive the litigation hold?
Which of our custodians and data sources are likely to be in scope?
How will we handle privileged documents, and do we need a 502(d) order?
Who is likely to be deposed, including a corporate representative?
How will proportionality limit what the other side can demand from us, and what we can demand from them?

Find a business litigation lawyer

Browse Business/Commercial Litigation attorneys in the Haute Lawyer directory, or start at Find a Lawyer.

Featured: Haute Lawyer members who practice in this area include Brad Thoreson (trial lawyer and founding shareholder of Buchalter's Seattle office) and Robert Zarco (franchise and commercial litigation in federal and state courts and arbitration, Zarco Einhorn Salkowski & Brito, P.A., Miami).

Haute Lawyer members are featured through paid membership. Membership is not an endorsement or a ranking.

This page is general information, not legal advice. Discovery rules vary by court and case; consult a licensed attorney about your situation.

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