Automatic cash sweeps: move surplus from the current account without starving operations

An automatic sweep moves cash between accounts when balances cross defined thresholds. A business can keep enough money in the operating account for payments while moving surplus into an interest-bearing account, then return money when the operating balance falls.

Set a minimum operating balance before sweeping anything

The business should define the amount that must remain in the current account after considering payroll, tax, supplier runs and unexpected payments. A target balance should reflect real volatility rather than one average day.

If the account usually needs £250,000 but can need £600,000 on payroll week, a fixed £250,000 target can create avoidable payment failures.

Choose when the sweep runs

Bank products can sweep at end of day, on scheduled dates or under other rules. Understand whether incoming cash after the sweep is available immediately and when a reverse sweep can happen.

Payment cut-offs matter. Money sitting in savings can be economically available but operationally too late for a same-day outgoing transfer.

Use instant-access savings for cash that may need to return quickly

Notice or fixed-term deposits are usually poor destinations for automatic operating sweeps because the company may not be able to pull money back on demand.

Match the destination product to the liquidity purpose. Longer-term surplus can use different treasury instruments from day-to-day buffer cash.

Measure the interest benefit net of bank fees and idle buffer

Calculate average swept balance, interest rate and any account charges. A complex sweep producing only a small interest benefit can cost more in administration than it earns.

Review the target when rates or business cash patterns change. Treasury settings should not remain untouched for years.

Plan for failed or delayed sweeps

An outage or bank restriction can prevent money returning to the operating account. Keep an emergency buffer and another authorised route for critical payments.

Do not rely on an automated transfer as though it were guaranteed real-time liquidity. Operational resilience matters most on tax and payroll days.

Keep inter-account transfers out of revenue and expense

A sweep moves the company's own cash between accounts. The accounting system should record it as an internal transfer, not sales or cost.

Reconcile both source and destination accounts so one side of a failed or delayed transfer does not create a phantom balance.

Worked example: an operating account target is £300,000. At 6pm the account holds £900,000, so the bank sweeps £600,000 into instant-access savings. The next morning £450,000 of supplier payments are due. If the reverse sweep is not available before the payment cut-off, the company can still fail payments despite having £900,000 across both accounts.

Set different targets for ordinary days, payroll week and tax dates where the bank product permits, or maintain a larger permanent buffer. The extra interest from a very aggressive sweep can be wiped out by one late-payment fee or damaged supplier relationship.

Review deposit protection and banking-group concentration on the destination account. Moving cash automatically into savings can increase the amount exposed to one banking licence unless treasury limits are considered as part of the sweep design.

Set one person in treasury or finance as the owner of the sweep rules and require approval for changes to target balances. A bank portal can make threshold changes look like routine settings, but changing a target from £500,000 to £100,000 can move hundreds of thousands of pounds out of the payment account every night. Keep a change log with old value, new value, reason and approver.

Review interest earned against operational incidents every quarter. If the sweep earns £8,000 of extra annual interest but causes supplier failures or emergency CHAPS payments costing time and fees, the target is too aggressive. Treasury should optimise total liquidity value rather than maximise the amount removed from the current account.

For groups, do not confuse a same-entity sweep with intercompany cash pooling. Moving money between two accounts owned by the same company is an internal transfer. Moving cash from a subsidiary to a parent creates a different legal and accounting relationship and should use the group cash-pooling framework rather than a simple savings sweep.

Test sweep behaviour before major calendar events. A year-end holiday, month-end payroll or large quarterly tax date can change both payment timing and overnight balances. Temporarily raising the target can be sensible where several obligations fall together. Document any temporary override and its expiry so an emergency setting does not become the permanent treasury policy.

Where interest is credited monthly, reconcile the savings interest separately from sweep principal. Internal transfers should net to zero across the two bank accounts, while interest is genuine income. This simple distinction prevents accounting software from treating every inbound sweep as new revenue.