What changed
New seats must be paid for before users get access. From October 1, 2026, existing card and PayPal customers are charged upfront for assigned seats at the start of their next billing cycle. GitHub says users who go past included usage may need to pay more and included usage may be prorated, while plan prices stay the same.
Who it affects
Copilot Business and Enterprise customers paying by credit card or PayPal.
What to do
Expect upfront seat charges from October 1, 2026, and review seat assignments before your billing date.
Source: https://github.blog/changelog/2026-09-03-reopening-copilot-business-and-enterprise-signups/