How to Earn Interest on Business Cash Without Losing Access to It in 2026

Idle cash loses value when every pound sits ready for a withdrawal that will never come this week. Split business cash by when you need it: an operating buffer for the next 30 to 60 days, and a surplus tranche for everything beyond that.

Match each portion to an account, deposit or fund whose access terms fit that timeline, using rates checked today, not a number carried over from last year.

TL;DR

• The Bank of England held Bank Rate at 3.75% at the meeting ending 29 July 2026; the next review is due 17 September 2026, the floor most business savings and fund rates track.
• On 1 September 2026, named UK business savings accounts paid between 2.80% and 4.00% AER, a real spread between providers checked the same day.
• FSCS deposit protection rose from £85,000 to £120,000 per banking group on 1 December 2025, and never covers e-money or a money market fund.
• The BlackRock ICS Sterling Liquidity Fund behind our own yield route published a 7-day net yield of 3.88% as of 28 August 2026, separate from our dated 13 November 2025 tiers of 3.29% to 3.79% AER. Your capital is at risk.
• A sweep account moves cash above your threshold out overnight and back before the next business day opens; it is a rules-based transfer, not a daily decision.
• On a £520,000 surplus, a 180-day notice account gains roughly £2,340 a year over easy access for six months of lost flexibility; a money market fund route gains only around £200 a year and swaps deposit protection for capital at risk.

Want help sizing your own buffer and surplus split? Talk to Round about your current cash position.

How much cash do you need to keep instantly accessible?

Start with the number that matters: how much cash you would need in the next 30 days if a client paid late or a supplier wanted payment on delivery. That figure, not your total balance, is your buffer.

Build it from fixed commitments: payroll, rent, committed supplier payments, plus headroom for a concentrated customer or seasonal swing.

Everything above that buffer is surplus, and it does not need to sit in the same account as your operating cash.

A business with £40,000 a month in payroll, rent and committed payments might set a two-month buffer of £80,000 in an instant-access account, treating anything above that as surplus.

Revisit the figure: a buffer sized for a steady month is too small the moment a customer pays 45 days late or a quarter doubles orders.

What do instant access, notice and fixed-term accounts pay right now?

The rate on offer moves with the wider environment: the Bank of England held Bank Rate at 3.75% at the MPC meeting ending 29 July 2026, published 30 July 2026, next review 17 September 2026.

Many floating business savings and money market products price against SONIA, the Sterling Overnight Index Average, rather than Bank Rate directly. SONIA stood at 3.7303% on 27 August 2026, the Bank of England's most recent published figure.

Named rates differ meaningfully between providers on the same day: on 1 September 2026, Recognise Bank quoted 3.55% AER on Easy Access Issue 2, Allica Bank 2.80% AER, variable, on its own Issue 2, a 0.75 point gap between two instant-access products.

Notice pays more, though not uniformly: Recognise Bank's 95-Day Notice Issue 4 matched its Easy Access rate at 3.55% AER, its 120-Day Notice Issue 2 paid 3.90%, and its 180-Day Notice Issue 2 paid 4.00%.

One inconsistency is worth naming: Recognise Bank's current-issue products stated FSCS cover up to £120,000, matching the limit from 1 December 2025, while an older 35-Day Notice issue on the same page still showed £85,000. Check the regulator's figure if a product page disagrees.

Who moves the money in a sweep, and what happens if a payment lands late?

A sweep is not a daily decision. The bank or platform evaluates your balance at the end of each business day against a threshold you set in advance, for example £100,000.

Above that threshold, the excess moves automatically into a higher-yielding account or fund overnight, then returns before the next business day begins.

Two common structures exist: an investment sweep, into a money market fund, and a loan sweep, paying down a revolving credit balance instead, cutting interest cost rather than earning it.

Our own AI Treasury Manager runs this as continuous automation, finding rates and sweeping funds for payroll and bills against thresholds you set, rather than waiting for someone to review the balance first.

The mechanic that catches finance teams out is the cutoff, not the sweep. Banks stop crediting same-day transactions at a fixed time; a payment landing after it waits until the next business day, whichever provider you use.

Applied to a sweep, a payment arriving after the balance is swept out will not draw on that cash until it returns next morning. Ledger and available balance diverge until then, and matching what went out against what came back is the ordinary cost of running a sweep.

Set the threshold against your buffer figure, not a round number that looks tidy: too low, and the account sweeps cash you needed for an unplanned payment, costing you the rest of that day to pull back.

What does a money market fund hold, and how fast can you get the cash back?

A money market fund pools your cash with other investors' money and buys short-term, high-quality debt maturing in days or weeks, which is why many funds offer fast access.

A savings account holds your money as a bank deposit. A fund holds units in a pooled investment owning the debt, so the return floats and FSCS cover does not apply.

Our own yield route places cash into the BlackRock ICS Sterling Liquidity Fund, an AAA-rated (S&P) fund in segregated accounts, not on our balance sheet. Its factsheet, data as at 31 July 2026, describes it as a Low Volatility NAV fund under the Money Market Funds Regulation, weighted average maturity 58 days.

The fund's net yield moves daily, separate from any figure a provider quotes with its own fixed date. As of 28 August 2026, the fund published a 7-day net yield of 3.88% (1-day 3.89%, 30-day 3.86%).

Our own tiers carry a fixed date instead, 13 November 2025: 3.29% AER Launch (next-day), 3.59% Growth and up to 3.79% Enterprise (both same-day).

Your capital is at risk here; it is an investment, not a deposit.

Where same-day access is offered, treat the cutoff as the real constraint: withdrawals must be requested by 10:30am for same-day liquidity on our Growth and Enterprise tiers, with Launch settling next day instead. Ask any provider, including us, for its own cutoff in writing.

Fast access is not unconditional either. The FCA's 8 June 2026 update on UK Money Market Fund Regulation reform confirmed funds keep the ability to apply liquidity fees or redemption gates, and to suspend dealing, while staying open under stress: a normally same-day fund can charge you to redeem or pause redemptions during genuine stress.

A bank deposit carries no such mechanism.

How much protection do you get if a bank or fund fails?

FSCS raised its deposit protection limit to £120,000 on 1 December 2025, following PRA rules confirmed in November 2025 after a March 2025 consultation. Before that, from 1 January 2017, the limit stood at £85,000.

That limit protects eligible deposits per banking group, not per account: three accounts at one bank still share one £120,000 ceiling.

It only applies to a deposit. FSCS's own guidance is direct: it cannot protect e-money or payment services firms, only money held by UK branches of authorised banks, building societies and credit unions.

This is design, not oversight: an e-money institution must safeguard money it holds overnight or longer under its own regime, so it can be returned if the business collapses.

A money market fund sits outside both. FSCS investment protection, a separate, lower limit covering a firm's failure or misconduct, was never designed to cover ordinary market risk in a fund's holdings.

An AAA rating and your capital is at risk are not in tension; the rating describes credit quality, not a guarantee against loss.

Businesses above £120,000 who want FSCS-eligible status typically spread it across banks, real admin when done manually. Introducer routes remove that admin, not the protection. Our own Savings route introduces you to Insignis Asset Management, with access to 100-plus accounts across 25 banks.

Balances above £120,000 at any single bank fall outside protection there, and spreading across the network is how the aggregate reaches £3.5m.

Before opening any account for the protection alone, ask which banking group actually holds the deposit, since a platform can route cash to a bank you did not choose, and whether you already hold balances that would share the limit.

When is a single instant-access account still the right call?

None of the structure above is free: every extra account or fund adds a relationship to manage, a cutoff to track, a reconciliation step to run.

If total business cash sits comfortably under £120,000 and almost all of it is genuinely your buffer, a single instant-access account at your existing bank is the sounder call: one relationship, no cutoff.

The leftover surplus earns only a few hundred pounds a year in extra yield, below the time cost of onboarding a second provider.

The same logic holds for a business with genuinely unpredictable intraday payment timing, where a fixed cutoff such as 10:30am for same-day liquidity is a live constraint. For that business, an account with no cutoff is worth more than the extra yield a notice account or fund would pay.

This is a fit question, not a size threshold: splitting cash pays for itself once the surplus, and the time saved automating it, exceeds the admin of running more than one account.

For many that point arrives before a finance hire; for a small business it may not arrive at all.

What the choice costs you in a year

Take a business holding £600,000 in cash, £40,000 a month in payroll, rent and committed payments. A two-month buffer of £80,000 sits in Recognise Bank's Easy Access Issue 2 at 3.55% AER (checked 1 Sep 2026), leaving £520,000 surplus.

Left in the same easy-access account, the surplus earns 3.55% AER, £18,460 a year (£520,000 x 3.55%), with no change in access.

Moved to Recognise Bank's 180-Day Notice Issue 2 at 4.00% AER, the same £520,000 earns £20,800 a year (£520,000 x 4.00%), a gain of £2,340. The cost is 180 days' notice on the full amount, and since £520,000 exceeds the £120,000 FSCS limit at one bank, £400,000 would sit unprotected unless spread further.

Moved instead to our Growth Money Market Account, the BlackRock ICS route, at 3.59% AER as of 13 November 2025, the same £520,000 earns £18,668 a year (£520,000 x 3.59%), just £208 more than easy access.

Your capital is at risk here; it is a fund holding, not a deposit, and withdrawals must be requested by 10:30am for same-day liquidity, which is not the anytime access of an easy-access account.

On these dated figures, notice pays most per pound but costs six months of access on the full surplus. The fund route barely beats easy access in yield while trading deposit protection for capital-at-risk status.

Easy access costs nothing in flexibility, the baseline every option has to beat.

The same £520,000 spread through Insignis's 25-bank network sits comfortably inside the £3.5m aggregate FSCS ceiling without breaching the £120,000 limit at any bank, the scenario where an introducer route earns its fee.

What should you ask a provider before moving cash?

The account type on the label matters less than the specific terms attached, which vary enough between providers on the same day that these questions matter more than the product name.

A provider that cannot answer them clearly in one conversation is telling you something about how the product works, whatever the marketing page says.

• What is the exact notice period or dealing cutoff for withdrawals, and does it change by tier or balance?
• Is this a deposit, FSCS-eligible and capped per banking group, or a fund investment, capital at risk and outside FSCS cover?
• If it is a fund, what does it invest in, what is its weighted average maturity, and how often is the yield updated?
• If it is an introducer arrangement, which regulated entity actually holds the money, and under what permission?
• Could this fund apply a liquidity fee, a redemption gate, or suspend dealing under stress, and has it ever done so?
• What happens if you need funds back faster than the stated notice period or after the cutoff: a penalty, or simply not possible until the next business day?

Is this worth setting up before you have a dedicated finance hire?

The mechanics do not change with company size, but automating them makes more sense over time. A business moving a few thousand pounds a month can run the split by hand, checking rates monthly.

Once cash positions move across accounts, currencies or entities daily, manual tracking becomes the more expensive option, not the cautious one, and a sweep or always-on tool starts paying for the time it saves, independent of yield.

The same logic compounds across currencies: surplus GBP, USD and EUR balances mean the buffer-and-surplus decision three times over, where automation earns its keep fastest.

Whichever route you take, the buffer stays constant: decide what you need in the next 30 to 60 days first, protect it without compromise, then decide where the rest goes, against rates dated the day you commit.

Where we would put ourselves, on the same terms as everything else here. Choose our Savings route when the surplus is above £120,000, you want FSCS eligibility without opening accounts at 25 banks yourself, and the introducer structure is acceptable to your board.

Choose our money market route only if you accept a fund holding rather than a deposit, and the 10:30am cutoff fits your payment run. Your capital is at risk on that route.

Stay on a single instant-access account, Recognise Bank or Allica Bank in the table above, when the surplus is small enough that the yield difference is smaller than the admin of moving it.

Take a Recognise Bank notice or fixed-term account when the money is genuinely idle for the full notice period, because that headline rate is usually better than either of ours and you are paid for giving up the access.

The buffer decision comes first in every one of those cases, and no product changes it.

Related reading

Best places to park idle business cash in the UK (2026): a ranked comparison of nine specific providers, for once you have worked out how much of your cash falls into each bucket here