ACH: the payment that waits for the batch to fill

Three payments sent across the day and all three show up at once, overnight, with the same timestamp. It is neither a coincidence nor a bank problem: it is how a system that processes in batches works.

What it actually is

ACH is an automated clearing house: a system that collects operations, groups them, and settles them in batches at set moments, rather than handling them one by one as they arrive.

How it differs from a wire

Why the moment you send matters

A batch system has cut-offs. A payment entering just before the cut-off travels in that batch; one entering just after waits for the next. That explains why two transfers made twenty minutes apart settle at different times.

The name is American, the model isn't

ACH is what it is called in the United States. Many countries run equivalent clearing systems under other names, and the batch logic repeats: grouping is more efficient than handling each operation separately.

Where you will be asked for it

Almost never directly. Usually it shows up as the method a platform pays you by, or as a slower and cheaper collection option next to the urgent alternative.

Related terms

Its individual counterpart is the wire transfer, and the European euro equivalent is SEPA. The rest is in the glossary.

This is not financial, legal, tax, or investment advice.