Proration
Proration is the adjustment of a charge to cover only part of a billing period. In CSP billing, proration applies when a subscription changes mid-term, for example when seats are added partway through a month, so the customer is billed only for the portion of the period the change was active.
Key Takeaways
- Proration charges for part of a period rather than the whole.
- It applies to mid-term changes such as added seats or upgrades.
- Accurate proration keeps invoices fair and margin correct.
- It is a common source of reconciliation discrepancies when done manually.
How proration works
When a subscription changes partway through a billing period, the charge is calculated for the days the change was active rather than the full period. The same logic applies on both the supplier and customer sides, which is why proration has to be reconciled so the customer charge matches the provider charge.
Why it matters for Microsoft CSPs
Subscriptions change constantly, and each mid-term change creates a prorated charge. Getting proration wrong, or missing it, is a frequent cause of billing errors and revenue leakage. Automated proration keeps invoices accurate as changes happen.
How Work 365 supports this
Work 365 calculates proration automatically for mid-term changes and reconciles it against the provider invoice. See Billing and Invoicing.
Related terms: CSP Billing Reconciliation, Co-terming, NCE, Billing Schedule.
Related Work 365 Resources
- Blog: Proration Controlled at the Billing Contract Level
- Blog: Billing Schedules in CSP Billing: The Missing Layer Between Contracts and Invoices
- Product: Billing and Invoicing
FAQ
When does proration apply in CSP?
When a subscription changes mid-term, such as adding seats or upgrading partway through a period.
Why is proration a reconciliation issue?
Because prorated amounts must match on the supplier and customer sides, and manual calculation is error-prone.
