Litigation File Retention: What to Keep, What to Return, What to Destroy

Every litigation practice eventually faces the closed-file problem: boxes in offsite storage, terabytes on a server, and no clear answer to how long any of it must be kept or what can safely be destroyed. A written law firm document retention policy answers those questions once, so closing a file becomes a routine step rather than a judgment call made years later by someone who never worked the matter.

This guide covers what a retention policy for litigation files should include, how to set retention periods when the rules vary by state, what belongs to the client at closing, how to retain evidence originals and productions, when a hold overrides the schedule, how to destroy files securely, and how to roll the policy out. Retention is an area where state rules and ethics opinions differ significantly, so use this as a framework and fill in the periods from your own jurisdiction's guidance.

What should a litigation file retention policy cover?

A complete policy covers what is kept, for how long, who decides, how the client is told, and how material is returned or destroyed. If a staff member could not close a file correctly using only the policy, something is missing.

• Scope: which records the policy covers, including email, messaging and cloud storage, not just paper.
• Categories of file material, each with a retention period and a trigger date.
• The closing procedure and who performs it.
• Client notice, in the engagement letter and again at closing.
• What is returned to the client, and how.
• Holds that suspend destruction, and who can lift them.
• Destruction methods for paper and electronic records, including backups.
• A disposition log recording what was destroyed, when, how and by whom.
• An owner for the policy and an annual review date.

How long should a law firm keep litigation files?

There is no single national answer. Retention periods depend on your state's rules and ethics opinions, malpractice limitation periods where you practice, the type of matter, other laws that apply to particular records, and the client's instructions.

A few anchors are common. ABA Model Rule 1.15(a) requires complete records of trust account funds and other property to be preserved for a period after the representation ends; the Model Rule shows that period in brackets as five years so each state can set its own. Family matters raise their own considerations: custody and support orders can often be modified or enforced long after the original judgment, so some firms tie retention of key family-law materials to the youngest child reaching the age of majority, plus a margin. Treat that as a design option to evaluate, not a rule.

Fill in the periods with your state's requirements, and have the schedule reviewed by ethics counsel licensed in your state, or checked against your state bar's published guidance, before you adopt it.

What belongs to the client, and what happens at closing?

Model Rule 1.16(d) requires a lawyer, when a representation ends, to surrender papers and property to which the client is entitled, though what counts as the client's file varies by state. A consistent closing procedure turns that duty into a checklist.

1. Confirm the matter is actually over. Check for pending appeals, post-judgment motions, compliance deadlines and fee issues.
2. Inventory the file. List client-provided originals, the core file, the evidence set and any physical items.
3. Return client property. Deliver originals and property with a receipt.
4. Send the closing letter, including the retention period and how to request the file.
5. Revoke access for the client, co-counsel, experts and any integrations tied to the matter.
6. Set the disposition date and record it where the annual destruction review will find it.

Some jurisdictions' guidance calls for an additional notice shortly before destruction; adapt the letter and your procedure to match.

How should you retain evidence originals and productions?

Keep the evidence originals, the records that show their integrity, and the versions you actually produced or filed together, for the full retention period. Separating them, or keeping only the final exhibits, makes the record hard to reconstruct if the matter returns.

Many litigation files now hold digital evidence whose value depends on showing it was not altered. If a custody order is revisited years later, or an appeal or malpractice claim questions what was produced, the firm may need to show what the client provided, what the firm produced, and that the two match.

• Original files exactly as received, unmodified.
• Hash values, such as SHA-256, recorded at intake, with the date and who received each file.
• Produced and filed versions, with their Bates or exhibit numbers.
• Production logs and transmittal records: what went to whom, and when.
• Source manifests for message logs, showing which exports each log was built from.
• Reviewer corrections to machine-extracted text, kept distinct from the original output.

Tools that capture integrity data at intake make this close to automatic. Evidence Helper, for example, preserves originals untouched and records a SHA-256 hash for each file on arrival. For the underlying concepts, see what a SHA-256 fingerprint proves and chain of custody for digital evidence.

When does a hold override the retention schedule?

Whenever litigation or an investigation involving the file is pending or reasonably anticipated. A hold suspends destruction of the affected materials, whatever the schedule says, until someone with authority lifts it.

Federal Rule of Civil Procedure 37(e) addresses the consequences when electronically stored information that should have been preserved in the anticipation or conduct of litigation is lost because a party failed to take reasonable steps to preserve it; state rules and case law set similar expectations. For a law firm's own closed files, the triggers reach beyond the client's case:

• A pending appeal, post-judgment motion or enforcement proceeding.
• A threatened malpractice claim or bar grievance.
• A fee dispute.
• A subpoena or other request for the file.
• A related matter for the same client or involving the same parties.

For drafting the hold itself, see litigation hold letters: what to include and when to send.

How do you destroy client files securely?

Destroy files by a method that makes the information unrecoverable, extend destruction to every copy including backups and cloud storage, and log it. Model Rule 1.6(c) requires reasonable efforts to prevent unauthorized disclosure of client information, and that duty does not end when the file closes.

• Paper: cross-cut shredding, or a destruction vendor that provides a certificate. Comment 3 to Model Rule 5.3 addresses outside service providers such as scanning and storage services, and a shredding vendor is a similar outside service, so vet its practices and confidentiality terms.
• Firm systems: deletion that reaches the document management system, email archives, shared drives and local copies.
• Backups: a documented approach for backup sets, which often cannot be selectively purged; many firms let backups age out on a defined cycle and record that cycle in the policy.
• Cloud vendors: deletion requests and written confirmation, consistent with the vendor's contract terms.
• Devices: wiping or physical destruction of retired drives, laptops and phones that held client data.

Record every destruction in a disposition log: matter, categories destroyed, date, method, who performed it and who approved it. The log is your evidence that the policy was followed. For vendor diligence on cloud tools, see client confidentiality and cloud software.

How do you roll out a retention policy?

Apply the policy to new matters first, then work through the backlog of closed files in batches. Trying to fix every old file before starting usually means the policy never starts.

1. Adopt the schedule after confirming periods against your state's rules.
2. Add a retention clause to the engagement letter template.
3. Build the closing checklist into your matter system so every file closes the same way.
4. Triage the backlog by closing year, oldest first, checking each file for holds and client property before destruction.
5. Run an annual destruction cycle with a named approver and the disposition log.