How direct debit works
The customer signs a mandate once, online, by entering their bank details and agreeing to be debited. After that, each time an invoice comes due, the business, through its payment provider, asks the customer's bank for the money. The customer does not have to approve each payment, though most schemes require advance notice of what will be taken and when, at least when the amount changes.
Each region has its own scheme. In the United States it is an ACH debit, in the eurozone and wider SEPA area it is SEPA Direct Debit, and in the United Kingdom it is Bacs Direct Debit. The rules differ in detail, but the shape is the same: one mandate, then debits against it.
Bank debits trade speed for reliability. A debit takes several banking days to settle, rather than a card's instant approval, and it can still fail afterward if the account lacks funds or has closed. In return, a bank account does not expire like a card does, so renewals fail less often for that reason, and fees are often lower than card fees. Customers can also reclaim a debit through their bank, and under some schemes that claim cannot be contested.
Worked example
A made-up agency bills a client $500 a month by ACH debit. The client signed a mandate on February 20.
- February 20: mandate authorized, nothing charged
- $0.00
- March 1: invoice issued, debit created, payment processing
- $500.00 in flight
- March 6: provider confirms the debit, invoice paid
- $500.00
The dates are illustrative. Settlement time depends on the scheme and the banks involved; until it confirms, the invoice shows a payment in flight, not a paid invoice.
Why direct debit matters
For business customers and long subscriptions, direct debit is often the payment method that fails least. There is no card to expire, no card limit to hit, and in many countries paying suppliers by bank debit is what finance teams expect.
It also costs less to collect in many cases, which matters on large invoices where a card fee calculated as a percentage adds up. The trade is patience: money arrives days later, so cash flow planning and access rules need to account for payments in flight.
Common mistakes
- Treating a created debit as paid A debit is not money until the provider confirms it. Mark the invoice paid on confirmation, not on creation.
- Forgetting that debits can fail late A debit can bounce days after it was submitted. It needs the same recovery process as a declined card.
- Using it where you need money now If a purchase must be confirmed at checkout, take a card for the first payment and use direct debit for renewals.