Not every U.S. accessibility requirement uses the same deadline.
ADA Title II
Covered state and local government entities have compliance dates based on population and entity type: April 26, 2027 for larger entities, and April 26, 2028 for smaller public entities and special district governments.
ADA Title III
There is not one federal website accessibility deadline that applies to every private U.S. business in the same way as the Title II web rule. Title III context, state law, contracts and litigation posture may matter.
Section 508
Section 508 is already in force for U.S. federal ICT contexts. The Revised 508 Standards incorporate WCAG 2.0 Level AA for many web and non-web requirements.
Federal procurement
Procurement can create accessibility documentation expectations through solicitations, contract language, VPAT / ACR requests and acceptance criteria. That is different from a universal public website deadline.
State and local accessibility requirements
State and local government requirements may include ADA Title II, state policies, procurement rules and agency-specific standards. Teams should confirm scope before choosing a testing target.
Contractual WCAG requirements
Contracts often name WCAG versions directly. A contract can require WCAG 2.1 AA or WCAG 2.2 AA even when a regulation uses a different version.