What is a billing cycle?
Published
A billing cycle is the recurring period a continuing service is invoiced for - usually monthly or annual - with a fixed anchor date each cycle starts from. It determines when the invoice issues, for what span, and when payment falls due.
Proration
The cycle's most common event: a mid-cycle plan change. A customer on a SAR 300/month plan upgrades to SAR 500 with 12 of 30 days remaining:
Daily price difference = (500 − 300) ÷ 30 = SAR 6.67Proration amount = 12 × 6.67 = SAR 80 (net)
SAR 80 plus VAT is invoiced now for the remainder of the cycle; the next cycle starts at the full 500. Cancellations and downgrades follow the same logic in reverse - through a credit note, never by editing the original invoice.
Practical points
- A stable anchor date simplifies reconciliation: all of a customer's invoices open and close on the same day.
- Annual vs monthly is a cash trade-off: annual improves your cash flow as a provider and requires deferred revenue treatment; monthly is accounting-simpler and lighter on the customer.
- The invoice states the covered period explicitly (from-to); it is the basis for the accounting spread on both sides.
Frequently asked questions
Is the billing cycle the same as the accounting period?
No. The billing cycle is a contractual rhythm with each customer and can start any day; the accounting period is your own calendar (month/quarter/year). The accounting spread is the bridge between them.
A customer wants all invoices on the 1st?
Close their current cycle with a proration invoice to month-end, then run cycles from the 1st - common, clean practice.