How recurring billing works
A customer subscribes to a plan with a price and a billing period. From then on, each period runs the same cycle: an invoice is generated, for the coming period or for the one just ended if you bill in arrears; the customer's saved payment method is charged; a receipt goes out. If the charge fails, a retry schedule tries again.
Two choices shape the schedule. Anniversary billing bills each customer on the day they signed up, so a customer who joins on the 14th is billed on the 14th of every month. Calendar billing lines everyone up on the same day, usually the 1st, and charges a prorated amount for the first partial period.
Not every recurring customer pays by card. Larger customers often receive an invoice with payment terms such as net 30 and pay by bank transfer. The schedule is the same; only the collection differs.
Worked example
A customer signs up on March 14 for a $49 monthly plan.
- Anniversary billing: first charge on March 14
- $49.00
- Anniversary billing: then the 14th of every month
- $49.00
- Calendar billing: March 14 to 31, 18 of 31 days
- $28.45
- Calendar billing: then the 1st of every month from April 1
- $49.00
$49 × 18 ÷ 31 = $28.45 for the short first period, then full months after that.
Why recurring billing matters
Recurring billing turns a sale into revenue you can forecast. Customers do not have to remember to pay and you do not have to chase them every month, which is why it is the default for software, memberships, newsletters and anything else people pay for again and again.
It also makes billing errors expensive: a mistake repeats every period until someone notices. That is why the rules around the charge (proration, trials, retries, tax) matter as much as the charge itself.
Common mistakes
- Charges without a document Every charge should map to an invoice the customer can open, with the period it covers. A bare card charge invites a dispute.
- Treating failed payments as cancellations A declined renewal is usually an expired card, not a decision. Retry it and ask for a new card before you end the subscription.
- Ignoring changes between renewals Upgrades, downgrades and seat changes partway through a period need proration, or customers pay for time they did not use.