Significant disproportionality: the rule your district’s data feeds — and the 2026 rewrite to watch

In its 2026 Unified Agenda, the U.S. Department of Education listed plans to propose amendments to the IDEA regulations on significant disproportionality — the provisions governing how states measure racial disparities in special education identification, placement, and discipline — with a proposed rule possible as early as August 2026, as reported in the July 10, 2026 policy update from CEC’s Teacher Education Division. Nobody knows yet what the proposal will say. But the current rules shape state data systems, district budgets, and the scrutiny your referral and discipline decisions get — so this page covers how the system works now, what a rewrite could touch, and what it means at the caseload level. (It’s a separate track from the OSERS-to-HHS reorganization — same Department, different regulation.)

The three dimensions every state must measure

Every state that takes IDEA Part B funds must collect and examine data to determine whether significant disproportionality based on race and ethnicity is occurring in the state and in each district, across three dimensions (34 CFR §300.646(a)):

Risk ratios in one paragraph

The methodology (34 CFR §300.647) works like this: risk is the share of a racial/ethnic group experiencing an outcome — identification, a particular placement, a disciplinary removal. The risk ratio divides one group’s risk by the risk for all other students in the district; a ratio of 3.0 means three times as likely. Each state sets a risk ratio threshold it considers reasonable, plus minimum cell sizes and n-sizes so tiny populations don’t generate statistical noise — the Department treats a cell size no greater than 10 and an n-size no greater than 30 as presumptively reasonable. The calculation runs for seven racial/ethnic groups across the identification, placement, and discipline categories. That standardization is exactly what the 2016 “Equity in IDEA” rule (81 FR 92463) added — before it, states measured however they liked, and almost none identified any district. It is also, presumably, what a 2026 amendment would revisit: the threshold-setting flexibility, the methodology, or the consequences.

What identification costs a district

• Policy review, publicly reported. The district’s identification, placement, and discipline policies and practices get an annual review and, where needed, revision — and the district must report publicly on those revisions (§300.646(c)).
• The 15% set-aside. The district must reserve the maximum amount of Part B funds permitted under IDEA section 613(f) — 15 percent — for comprehensive coordinated early intervening services (CCEIS) addressing the factors behind the disproportionality (§300.646(d)). That money can serve students age 3 through grade 12, including students without IEPs who need academic or behavioral support — but it comes off the top of the budget that funds everything else.
• Root-cause work. The district must identify and address the contributing factors — the regulation names examples from lack of access to scientifically based instruction to inappropriate use of disciplinary removals (§300.646(d)(1)(ii)).

Where your caseload touches the ratios

Teachers don’t compute risk ratios, but they generate every data point in them. Three practices keep the inputs defensible. First, referral discipline: the SLD framework requires evidence that underachievement isn’t due to lack of appropriate instruction before identification — data-based documentation of repeated assessments, not impressions. Second, placement honesty: the “regular-class-under-40%” category is a measured setting, so LRE decisions at every annual review are also disproportionality inputs. Third, discipline procedure: every removal of a student with an IEP feeds the third dimension, which is one more reason the manifestation determination process and a functioning FBA/BIP pipeline matter beyond the individual student. Districts that handle behavior proactively rarely meet the discipline thresholds.

What to watch, and when

A Unified Agenda entry is a statement of intent, not a rule — the proposal must publish, take public comment, and finalize before anything binds, and target dates slip routinely. If the proposed rule lands in late 2026, changes wouldn’t plausibly reach state data systems before the 2027–28 cycle. What’s worth doing now: know whether your district is currently identified (states publish their determinations — and your state’s own federal grade is in the 2026 IDEA determination letters), know your state’s risk ratio threshold, and keep the local data clean — whatever the methodology becomes, identification, placement, and discipline records are its raw material. We track the federal reorganization pieces on the HHS oversight page and will fold in the Equity in IDEA proposal when the text publishes.

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