A lockbox is a bank-operated postal address where customer payments are sent, opened, deposited and reported by the bank on the business's behalf.
Why it matters in B2B collections
Lockboxes exist because cheques used to arrive in volume and someone had to open the envelopes. The bank does that work, banks the funds sooner than an internal mailroom would, and returns a data file listing what arrived. In the United States they remain common in industries where cheque payment persists, particularly wholesale, distribution, healthcare and construction.
Retail versus wholesale lockbox
A retail lockbox handles high volumes of standardised payments with a machine-readable remittance stub, and is largely automated. A wholesale lockbox handles lower volumes of larger, less standardised B2B payments, where a cheque may arrive stapled to a marked-up statement covering many invoices. Wholesale is where the interesting work is, and where the resulting data file is often incomplete, because a human is transcribing intent from a document that was never designed to be machine-read.
The lockbox file is where cash application starts, and often stalls
The bank returns a file of what was received, usually with an image of each item. That file is the input to cash application, and its quality determines how much of the work can be automated. If the remittance detail was captured, matching is straightforward. If it was not, the receipt arrives as an amount and a payer name, which is frequently not enough to identify which of eleven open invoices it settles.
Largely a United States institution
The lockbox model reflects a payments landscape where cheques stayed mainstream far longer than elsewhere. In the UK and Europe, where Bacs and SEPA displaced cheques much earlier, the equivalent problem is not opening envelopes but reconciling bank transfers that arrive with a truncated or missing reference. The underlying difficulty is identical: the payment and the explanation of the payment travel separately.
Lockbox: common questions
What is a lockbox in banking?
What is the difference between a retail and a wholesale lockbox?
Are lockboxes still used?
Go deeper: Applying lockbox and bank receipts automatically.
How this connects to other terms
- Cash application
The lockbox file is the raw input that cash application works from.
- Unapplied cash
Incomplete lockbox remittance data is a leading source of unapplied cash.