Sweep account

Definition

A sweep account automatically moves surplus cash between accounts — typically sweeping idle balances into an interest-bearing or debt-reducing account overnight, and back when needed. It puts otherwise-idle working cash to work without manual intervention.

In plain terms

At the end of each day, cash above a set threshold is swept where it earns interest or pays down borrowing; if the main account runs short, funds are swept back. It squeezes value from cash that would otherwise sit still.

Why it matters

Sweeping is a treasury technique for making the most of a fluctuating cash position. See notional pooling and cash position.

In practice

Picture a UK limited company with a current account used for day-to-day trading and a linked account earning interest or reducing an outstanding facility. Once a sweep is set up, the finance team no longer has to remember to move cash around manually at the end of each day — the bank does it automatically, sweeping surplus balances across and pulling funds back the moment the trading account needs them.

The main judgement call for a director is setting the threshold correctly: leave too much sitting in the trading account and the sweep barely does anything; set the threshold too low and everyday transactions could trigger unnecessary movements back and forth. Getting this right usually means watching the pattern of receipts and payments over a normal trading cycle before finalising the settings, rather than guessing at the outset.

How lenders read it

When a lender reviews a company's banking arrangements, a sweep account signals a business with organised treasury habits — cash isn't left idle by accident, and the arrangement usually points to a company that reviews its cash position regularly rather than reactively. That said, a sweep can also mask short-term account balances that look thin on paper simply because funds have been swept elsewhere overnight, so lenders assessing affordability will typically look at the underlying group or linked-account position rather than a single account snapshot.

This is also where notional pooling is worth distinguishing from a sweep: pooling offsets balances for interest purposes without physically moving cash, whereas a sweep genuinely transfers funds between accounts. A director describing their banking setup to a lender should be clear on which one is in place, since they affect visible account balances differently.