Ontario operates a centralized waitlist model where families must wait to receive an "invitation" for funded core clinical services. As of the May 2026 FOI data, 91,974 children are registered, but only 22.5% hold an active funding agreement (not proof of service receipt). The remaining 77.5% are on the waitlist, with average waits of 5+ years (ETWO analysis of MCCSS FOI data).
The annual gap — estimated at $570M+ (FAO 2020 estimate at 2018-19 service levels; a dated point-in-time estimate) represents the difference between what Ontario would need to fund all registered families at OAP rates and what is currently budgeted. Children age out of the commonly described early intervention window (roughly ages 2–5) while waiting, causing irreversible developmental harm.
These Ontario figures establish a serious Ontario access problem. They do not, by themselves, establish Ontario's rank against provinces that publish different measures.