Discovery Proportionality: The Rule 26(b)(1) Standard

Discovery proportionality under Rule 26(b)(1) means that a request for information in federal civil litigation must clear two hurdles at once: the information has to be relevant to a claim or defense, and the request has to be proportional to the needs of the case as measured by six specific factors.¹ Relevance alone no longer justifies a sweeping demand for documents or data. Since the 2015 amendment moved the proportionality factors into the main definition of discoverable information, both sides have had to weigh cost, burden, and practical value from the moment they draft a request or an objection.

How the Standard Works

Relevance is necessary but not sufficient. A request for ten years of company-wide email might relate to the claims in a case, but a judge can still block it if the projected cost dwarfs whatever the search is likely to turn up. The Advisory Committee Notes to the 2015 amendment describe the change as restoring the proportionality factors “to their original place in defining the scope of discovery” and reinforcing the obligation of parties to consider those factors when making any discovery request, response, or objection.¹ Before that, courts often treated proportionality as an afterthought raised only when someone complained. Now it is part of every discovery decision from the start.

The Six Factors

Rule 26(b)(1) lists six considerations a court weighs when deciding whether a request is proportional. No single factor controls, and judges have wide discretion to balance them based on the circumstances of the case.

Importance of the issues at stake. Cases involving significant public interests or civil rights can justify broader discovery than a routine private commercial dispute. An employment discrimination lawsuit or a challenge to government policy may warrant expensive searches that a straightforward contract case would not, because the outcome affects more than just the two litigants.
Amount in controversy. If a plaintiff seeks $10,000 in damages, a court is unlikely to order $200,000 worth of data processing. There is no fixed ratio, and courts recognize that neither side can predict costs or case value with precision early on. A stark mismatch between potential recovery and projected discovery expense almost always cuts against the request.
Relative access to relevant information. When one party holds virtually all the records, courts expect that party to shoulder more of the burden. This factor shows up constantly in employment disputes, where the employer maintains personnel files, emails, and payroll data the employee has no other way to obtain. Information asymmetry alone does not make a request proportional, but it weakens the responding party’s argument that the request is unfair.
Parties’ resources. A multinational corporation with a dedicated litigation support team can absorb the cost of a complex electronic search far more easily than a sole proprietor. Courts look at the actual financial capacity of each side and may limit or shift costs to prevent one party from being priced out of the case.
Importance of the discovery in resolving the issues. Evidence that goes to the heart of a disputed claim carries more weight than information only tangentially related. If the requested documents are the only way to prove a central element, a court will tolerate higher cost and burden. If the same facts are available from a less expensive source, the cheaper route wins.
Whether the burden or expense outweighs the likely benefit. The catch-all balancing test. Even when every other factor favors production, a court will shut down a request if the projected cost of collection, review, and production would produce evidence of minimal value.¹

Judges rarely find all six factors pointing the same direction. The more common scenario is a split, where the stakes justify broad discovery but the cost does not, or where information asymmetry favors the requesting party but the evidence is only marginally useful. Courts handle these splits by narrowing the request rather than granting or denying it outright, often limiting date ranges, custodians, or search terms to bring the scope in line with what the case actually needs.

Who Has to Prove What

The 2015 Advisory Committee Notes describe proportionality as a shared responsibility. Neither side gets a pass. The party seeking discovery must be ready to explain why the specific information is needed and how it connects to the claims or defenses. The party resisting must show, with specifics, that the burden or cost is unreasonable relative to the case.¹

Generic objections no longer work. A responding party that stamps “disproportionate” on every request without estimating actual costs, identifying the volume of data involved, or explaining the technical difficulty will lose that argument. Courts expect concrete numbers: how many custodians would need to be searched, how many gigabytes of data are at issue, and what the estimated cost of collection and review would be. A requesting party that cannot articulate why it needs the information, or why a narrower request would not serve the same purpose, risks having the request trimmed or denied.

The Rule 26(f) Conference

Proportionality discussions are supposed to start before anyone files a motion. Rule 26(f) requires the parties to meet and develop a proposed discovery plan early in the case. During that conference, they must discuss claims and defenses, arrange initial disclosures, address preservation, and propose the scope and limits of discovery.¹

The 2015 Advisory Committee Notes flag this conference as the place to reduce proportionality uncertainties. That means discussing the estimated volume of electronically stored information, which custodians are likely to have relevant data, and whether the parties can agree on search terms or date restrictions. A party that sandbags the conference and raises proportionality objections later will have a harder time convincing a judge it acted in good faith. If a party or attorney fails to participate in good faith in developing a discovery plan, the court can require that party to pay the reasonable expenses, including attorney’s fees, caused by the failure.²

Attorney Certification Under Rule 26(g)

Rule 26(g) adds an enforcement layer many litigants overlook. Every discovery request, response, or objection must be signed by an attorney (or the party, if unrepresented), and that signature certifies the filing is consistent with the rules, not pursued for an improper purpose, and not unreasonable or unduly burdensome given the needs of the case.¹ An attorney who signs a discovery request without making a reasonable inquiry into whether it satisfies proportionality has violated the rule.

The rule requires sanctions when a certification violates these standards. The court has discretion over the type of sanction, which can include monetary penalties, but imposing some sanction is mandatory. Proportionality is therefore not just a standard courts apply when resolving disputes. It is a professional obligation that attaches the moment an attorney puts a signature on a discovery document.

When the Court Must Cut Discovery Back

Beyond the general proportionality standard, Rule 26(b)(2)(C) identifies three situations where a court is required to step in and restrict discovery, whether or not anyone asks:

Cumulative or duplicative requests. If the same information can be obtained from a more convenient, less burdensome, or less expensive source, the court must limit the request to that cheaper alternative.
Ample prior opportunity. If the requesting party has already had sufficient time and means to obtain the information through earlier discovery, the court must deny a second bite.
Outside the scope of Rule 26(b)(1). If the proposed discovery fails the proportionality test, the court must block it.¹

The word “must” matters. These are not discretionary tools a judge might use. They are mandatory limitations that apply whenever the conditions are met. A party opposing a request should frame objections around these triggers when possible, because they give the court less room to split the difference.

Proportionality and Electronically Stored Information

Modern discovery overwhelmingly involves electronically stored information: emails, chat logs, database records, cloud storage. The sheer volume of digital data is what makes proportionality more than an academic concept. A single custodian’s email account can contain hundreds of thousands of messages, and a large organization may have dozens of relevant custodians.

Data That Is Not Reasonably Accessible

Rule 26(b)(2)(B) provides a specific escape valve for electronic data that is expensive or difficult to retrieve. A party does not have to produce electronically stored information from sources it identifies as not reasonably accessible because of undue burden or cost.¹ Backup tapes, legacy systems that require specialized software, and damaged storage media are common examples. The responding party bears the initial burden of showing the data is truly inaccessible. If it meets that burden, the requesting party can still get the data by showing good cause, but the court will weigh the same proportionality factors and may impose conditions, including shifting the cost of retrieval.

Technology-Assisted Review

When discovery involves collections too large for human reviewers to handle efficiently, technology-assisted review can reduce costs by using algorithms to identify responsive documents. The Federal Judicial Center recognizes TAR as a tool for achieving proportional discovery, noting that it can “greatly reduce the number of documents in a collection that need to be reviewed by humans.”³ Judges have authority under the Federal Rules to direct parties to use TAR when the volume of data makes manual review impractical or disproportionately expensive.

TAR is not a universal solution. When relevant documents can be identified by specific terms, account numbers, or other unique identifiers, traditional keyword searches may be more reliable and less costly. The choice between methods is itself a proportionality question, and courts evaluate whether the selected review approach is a “reasonable inquiry” under the circumstances.³

Cost-Shifting and Protective Orders

When discovery is justified but expensive, courts have tools to allocate costs rather than simply block production. Rule 26(c)(1) allows a court to issue a protective order specifying the allocation of expenses for disclosure or discovery.¹ The requesting party may be required to pay some or all of the production costs, particularly when the data comes from sources that are not reasonably accessible.

Courts generally start from the premise that the responding party pays for its own compliance. Cost-shifting becomes appropriate when the data is difficult or expensive to retrieve and the proportionality factors do not clearly favor production. Factors that influence cost-shifting include how specifically the request targets relevant information, whether the data is available from cheaper sources, the total production cost relative to the amount in controversy, and each party’s resources and ability to control costs. When a court does shift costs, the requesting party’s obligation is typically limited to the expense of making inaccessible data accessible, not the cost of reviewing that data for relevance and privilege once it has been retrieved.

Protective orders serve a broader function as well. A court can protect a party from annoyance, embarrassment, oppression, or undue burden or expense by limiting the topics of discovery, restricting who can view produced materials, or setting deadlines for specific categories of requests.¹ A party seeking a protective order must show good cause, which usually means demonstrating a specific and concrete harm rather than a generalized complaint about inconvenience.

Non-Party Subpoenas Get Stronger Protection

Proportionality protections extend beyond the litigants. Non-parties dragged into discovery through subpoenas receive their own layer of protection under Rule 45. The party issuing a subpoena must take reasonable steps to avoid imposing undue burden or expense on the recipient.⁴ If the subpoena crosses that line, the court must quash or modify it.

Non-parties get stronger cost protection than the parties themselves. When a court compels production over a non-party’s objection, the order must protect that person from significant expense resulting from compliance.⁴ In practice, this often means the requesting party picks up the tab for the non-party’s document collection and production costs. Courts can also impose sanctions, including lost earnings and reasonable attorney’s fees, against a party or attorney who issues a subpoena that violates the undue burden standard.

Phased Discovery

One of the most effective proportionality tools in practice is phased discovery. The court or the parties agree to break the information exchange into stages. The first phase focuses on the most important evidence, the documents and testimony most likely to resolve the central disputes. Only if that initial round leaves genuine gaps does the case proceed to a second, broader phase.

Federal judges have authority to order phased discovery through their case management powers under Rule 16, and the proportionality factors of Rule 26(b)(1) provide the analytical framework for deciding what goes into each phase. The logic is straightforward. If a targeted initial search might resolve the case through settlement or summary judgment, there is no reason to incur the cost of a full-scale production upfront. Phased discovery is particularly useful when large volumes of electronically stored information are involved: the first phase might focus on a handful of key custodians and a narrow date range before expanding.

Parties can propose phasing in their Rule 26(f) discovery plan, and judges who manage their dockets actively often raise it at the initial scheduling conference. Agreeing to phases voluntarily tends to produce better results than waiting for the court to impose limits, because the parties know their own data better than the judge does.

Preservation, Lost Data, and Sanctions Exposure

Proportionality intersects with preservation duties in an uncomfortable way. Parties anticipating litigation must preserve relevant electronically stored information, but deciding what to preserve, and for how long, requires the same kind of judgment proportionality demands. Over-preserving is expensive. Under-preserving can be catastrophic.

Rule 37(e) governs what happens when electronically stored information that should have been preserved is lost because a party failed to take reasonable steps to keep it, and the lost data cannot be restored or replaced through other discovery.² If the court finds another party was prejudiced by the loss, it may order measures no greater than necessary to cure that prejudice. If the court finds the party acted with intent to deprive the other side of the evidence, the penalties escalate sharply: the court may instruct the jury to presume the lost information was unfavorable, or in extreme cases dismiss the action or enter a default judgment.

This matters for proportionality because parties sometimes argue they should not have to preserve data that would be disproportionate to collect. That argument has limits. A court will not look kindly on a party that destroyed data first and raised proportionality second. The safer approach is to raise proportionality objections promptly, support them with concrete cost estimates, and seek a protective order or agreed limitation rather than unilaterally refusing to produce. Rule 37 sanctions for defying a discovery order can include paying the opposing side’s reasonable expenses and attorney’s fees, prohibiting the disobedient party from presenting certain claims or defenses, striking pleadings, or entering a default judgment.²

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
2
Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions
3
Federal Judicial Center. Technology-Assisted Review for Discovery Requests
4
Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena