The money market isn’t a place you can visit, and it isn’t a product you can buy from your high street bank. It’s a term for the wholesale market where institutions — banks, governments, large corporations — lend and borrow cash over very short periods, typically overnight up to twelve months. Interest rates in this market influence the savings rates and loan rates your business sees every day.

But here’s why it’s worth understanding even if you’re running a small business in Oldham rather than a trading desk in the City: money market funds, which invest in this market, are increasingly used by owner-managed businesses and their finance teams as a place to park surplus cash. They’re marketed as near-cash alternatives to current accounts. Whether that’s right for your business — and what the real risks look like — is what we want to work through here.

At its core, the money market is where short-term borrowing and lending happens between large financial institutions. When the Bank of England sets its base rate, it’s directly influencing the rate at which banks lend to each other overnight in this market. That rate then ripples outward — affecting your business savings account, your overdraft, and the interest on any variable-rate loans you hold.

The instruments traded in the money market include Treasury bills (short-term government debt), commercial paper (short-term corporate IOUs), and repurchase agreements (repos). These aren’t things you buy directly as a business owner. But they underpin the products that are positioned to you as ‘low risk, liquid alternatives to cash’.

The Bank of England publishes regular data on sterling money supply — referred to as M4ex — which gives a picture of how credit and liquidity are flowing through the system. When credit conditions tighten, the money market feels it first. For small businesses, that usually shows up as higher borrowing costs or tighter lending criteria before anything else changes.

Understanding this chain of cause and effect is useful context. It means that when the Bank raises or cuts rates, you can anticipate what’s likely to happen to your savings and borrowing costs rather than waiting for your bank to quietly adjust them.

Money market funds (MMFs) pool investor capital and use it to buy a diversified range of short-term debt instruments — the kinds described above. They aim to preserve capital and provide liquidity, while generating a return that tracks closely with prevailing short-term interest rates.

For businesses with surplus cash sitting in a current account earning little or nothing, MMFs can look attractive. They’re designed to be accessible quickly, they aim for a stable value, and — in a higher interest rate environment — they can offer a meaningfully better return than a standard bank account.

There are two broad types to be aware of:

• Government MMFs — invest primarily in government debt. Lower yield, but the underlying assets are considered very low risk.
• Prime MMFs — invest in a broader range of short-term corporate and financial institution debt. Slightly higher yield, but with correspondingly more credit risk and complexity.

For most owner-managed businesses, if MMFs are relevant at all, a government-focused fund is the more appropriate starting point. The incremental yield from prime funds rarely justifies the added exposure for a business that needs reliable access to its cash.

It’s also worth noting that MMFs are not bank accounts. They are not covered by the Financial Services Compensation Scheme (FSCS) in the same way your bank deposits are.

Money market funds are routinely described as ‘near-cash’ or ‘cash equivalent’ products, and in normal market conditions, that’s a reasonable description. But it can create a false sense of security. A Financial Times analysis from late 2025 made the point plainly: money market funds are not risk-free. There are two risks in particular that business owners should understand before using them.

Liquidity risk

MMFs are designed to be liquid, but during periods of market stress — think March 2020, or the UK gilt crisis of September 2022 — redemption pressure can build quickly. If many investors attempt to withdraw at the same time, funds can face liquidity strains. Regulators have long been concerned about this ‘run risk’, which is part of why the FCA has been consulting on reforms to MMF liquidity and redemption rules since late 2023.

Credit risk

Even in a government-focused fund, there is a small degree of credit exposure. In prime funds, the exposure is more material. If a significant issuer in the portfolio defaults or is downgraded, the fund’s net asset value can move. For most UK government MMFs, this risk is low — but it is not zero, and it should be understood rather than ignored.

The takeaway for business owners is straightforward: MMFs are a legitimate tool for managing idle cash more efficiently than a current account, but they should be understood as an investment product with some risk, not a risk-free bank substitute.

The UK’s regulatory framework for money market funds is in the process of being updated. The FCA issued a consultation paper in December 2023 (CP23/28) proposing enhancements to how MMFs manage liquidity buffers and redemption mechanisms. The stated aim is to make the sector more resilient during market stress — addressing the run risk discussed above.

In June 2026, the FCA confirmed that the UK government intends to introduce primary legislation to support these reforms by the end of the year. The direction of travel is toward stronger liquidity requirements and clearer rules around how funds can gate or delay redemptions in stress scenarios.

For most small businesses, the practical impact of this is limited — you’re unlikely to be running significant cash through MMFs in the first place. But if you are, or if you have a finance director or treasurer looking at institutional cash management options, it’s worth knowing that the product landscape will look somewhat different by mid-2027 than it does today.

More broadly, the regulatory focus on MMF resilience is a useful reminder that ‘low risk’ is not the same as ‘no risk’. The reforms are being made precisely because real vulnerabilities have been identified. That’s not a reason to avoid MMFs, but it is a reason to understand what you’re using them for and whether it’s genuinely appropriate for your situation.

For the vast majority of owner-managed businesses we work with, the money market isn’t something that needs to feature in day-to-day financial decision-making. But there are two scenarios where it becomes relevant.

If you hold significant surplus cash: If your business regularly sits on a large cash balance — whether that’s retained profits, a client deposit, or funds set aside for a future tax bill — it’s worth thinking carefully about where that cash is held. A savings account, a notice account, or in some cases an institutional MMF may generate better returns than a current account while preserving the accessibility you need. The right answer depends on the amounts involved, your cash flow pattern, and how quickly you might need to access the funds.

If you’re thinking about investing business profits: Business owners sometimes ask whether surplus profits should be invested rather than left in cash. That’s a broader question about investment strategy, risk appetite, and tax efficiency — and it’s one where getting proper advice matters. The money market sits at the lower-risk end of the investment spectrum, but it’s still not the same as holding cash at your bank. Capital gains tax implications, corporation tax treatment of investment income, and your own financial planning all need to feed into that decision.

If either of these scenarios resonates, it’s the kind of thing we can help you think through as part of a broader conversation about your finances.