Clarify AI credit reset timing (UTC) (#62008)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

content/copilot/concepts/billing/usage-based-billing-for-individuals.md

@@ -49,6 +49,8 @@ Each paid plan includes the following:
 
 Your base credits are used first. If you go beyond your base credits, the flex allotment is applied automatically at the same rates across your IDE, {% data variables.product.prodname_dotcom_the_website %}, and {% data variables.copilot.copilot_cli_short %}. No additional setup is required. Your usage dashboard shows your available allowance and what you've used.
 
+Included {% data variables.product.prodname_ai_credits_short %} do not carry over between months. Unused credits are forfeited, and your allowance resets to the full monthly amount at 00:00:00 UTC on the first day of each calendar month. This reset date is fixed and does not change based on your subscription billing date. See [AUTOTITLE](/billing/concepts/billing-cycles#billing-cycles-for-metered-products).
+
 ### {% data variables.product.prodname_ai_credits %} allowance by plan
 
 The following table shows what's included with each paid plan.

content/copilot/concepts/billing/usage-based-billing-for-organizations-and-enterprises.md

@@ -40,6 +40,8 @@ A user's included {% data variables.product.prodname_ai_credits_short %} are poo
 
 Adding licenses mid-cycle increases the pool immediately. Removing licenses mid-cycle doesn't shrink the pool: the decrease is reflected at the start of the next billing cycle.
 
+Included {% data variables.product.prodname_ai_credits_short %} do not carry over between months. Unused credits are forfeited, and the pool resets to the full monthly amount at 00:00:00 UTC on the first day of each calendar month. This reset date is fixed and does not change based on when licenses are added, removed, or billed. See [AUTOTITLE](/billing/concepts/billing-cycles#billing-cycles-for-metered-products).
+
 <!-- expires 2026-09-01 -->
 
 ### Promotional amounts for existing customers

content/copilot/reference/copilot-billing/license-changes.md

@@ -30,6 +30,14 @@ What you need to know about the following actions:
 * **Upgrading:** If you upgrade your plan (for example, from {% data variables.copilot.copilot_pro_short %} to {% data variables.copilot.copilot_pro_plus_short %}), the change is **immediate**. You are charged a prorated amount for the new plan.
 * **Downgrading/canceling:** Access remains until the end of the current billing cycle. **No refund for unused time**.
 
+### Included monthly allowance reset
+
+Paying for, renewing, upgrading, downgrading, converting from a trial, or resuming a plan after a lapse does not grant a fresh {% data variables.product.prodname_ai_credits_short %} allowance immediately. Your included monthly allowance resets at 00:00:00 UTC on the first day of each calendar month, regardless of your subscription billing date.
+
+For example, if you exhaust your {% data variables.product.prodname_ai_credits_short %} on May 28 and renew or upgrade your plan on May 30, your allowance does not reset until June 1.
+
+Any additional usage beyond the included allowance is charged separately and is unaffected by this monthly reset. See [AUTOTITLE](/copilot/concepts/billing/usage-based-billing-for-individuals) and [AUTOTITLE](/billing/how-tos/set-up-budgets#managing-budgets-for-your-personal-account).
+
 ## Organizations
 
 What you need to know about the following actions: