How Do Interest Rates Affect Businesses? A Guide for UK SMEs

Very few factors have as much influence on a business’s day-to-day finances as interest rates. They affect the cost of borrowing, how much customers spend, and even what suppliers charge. The Bank of England base rate, currently 3.75%, acts as a benchmark that influences the pricing of many business finance products.

Businesses typically interact with interest rate changes through variable-rate loans or overdrafts, where costs may increase or decrease as lenders respond to movements in the Bank of England base rate. With a fixed-rate loan, repayments remain the same until the end of the agreed term. Any changes in interest rates will only affect you if you refinance or renew the facility. This guide explains what interest rates mean for UK SMEs, what happens when they rise or fall, and what business owners can do to manage their impact.

What Are Interest Rates in Business and How Are They Set?

An interest rate is the cost of borrowing money, expressed as a percentage of the amount borrowed. It determines how much a business pays a lender in return for accessing a set amount of finance. Interest rates are not fixed and can rise or fall over time, depending on wider economic conditions. 

In the UK, the Bank of England influences interest rates through its base rate, which is set by the Monetary Policy Committee (MPC). The MPC meets regularly to decide whether the base rate should rise, fall or stay the same, with the aim of keeping inflation close to its 2% target. When the base rate increases, borrowing generally becomes more expensive and saving becomes more attractive. When it falls, borrowing tends to become cheaper, encouraging spending and investment.

Businesses do not borrow at the base rate itself. Instead, lenders add their own margin based on factors such as the business’s credit profile, trading history, whether or not the finance is secured, and the type of lending. As a result, two businesses applying for finance on the same day could be offered different interest rates. Business finance is typically offered with either a fixed or variable interest rate. A fixed rate stays the same for the agreed term, regardless of changes to the Bank of England base rate. A variable rate can rise or fall over time if the lender changes its rate in response to movements in the wider interest rate environment, meaning repayments may also change.

How Do Interest Rates Affect Businesses?

1. Rising interest rates

When the Bank of England base rate rises, borrowing typically becomes more expensive for SMEs with variable-rate loans, overdrafts or other business lines of credit. As lenders adjust their rates, repayments on these products may increase, putting additional pressure on cash flow and day-to-day operating budgets.

For instance, a £100,000 business loan repaid over five years at 8.5% would have monthly repayments of ~£2,052. If the interest rate increased by 1 percentage point to 9.5%, monthly repayments would rise to approximately £2,100. While an extra £49 a month may seem modest, it adds up to around £582 a year and almost £2,900 over the life of the loan.

The impact extends beyond borrowing costs. Suppliers, wholesalers and landlords often face the same increase in their own financing costs, which can be reflected in higher prices, rent reviews or more expensive supplier credit. As these costs move through the supply chain, SMEs may find themselves paying more to keep the business running. Higher interest rates can also reduce consumer spending. As household mortgage and borrowing costs increase, many consumers have less disposable income to spend on non-essential goods and services.

As a result, many SMEs become more cautious about investment. Plans to recruit staff, open new locations or purchase equipment may be postponed until borrowing costs become more manageable and future returns are easier to predict. The impact is not the same for every business. Retail and hospitality businesses, which often rely on discretionary consumer spending and operate on tighter margins, tend to feel the effects more quickly than sectors where revenues may be more stable and less dependent on day-to-day consumer demand.

2. Falling Interest Rates

Falling interest rates can ease financial pressure for many SMEs by reducing the cost of borrowing. The resulting lower cost of financing can improve cash flow, making it easier to cover day-to-day expenses, invest in growth or build a financial buffer. Businesses with variable-rate loans or overdrafts may benefit first, as their repayments could fall if lenders reduce their rates. Even a small reduction in monthly repayments can free up cash that can be reinvested elsewhere in the business.

Lower interest rates can also make it more affordable to take on new finance in order to invest in growth opportunities. Customer demand may also improve as lower mortgage and borrowing costs can leave households with more disposable income, encouraging spending on non-essential goods and services. This can benefit customer-facing businesses, particularly in sectors such as retail, hospitality and leisure.

That said, falling interest rates are not beneficial for every business. Businesses that keep significant cash reserves in business savings accounts or short-term deposits may earn less interest on those balances when rates fall. Businesses with fixed-rate borrowing are also unlikely to see any immediate reduction in repayments until their current agreement ends. When interest rates fall, it’s worth reviewing your existing finance arrangements and considering whether refinancing or planned investment has become more affordable. The right opportunity will depend on your business’s cash flow, borrowing needs and long-term plans. 

Interest Rates and Their Impact on Business Cash Flow

Changes in interest rates are often most visible on a business’ cash flow, because as the costs of borrowing increases or decreases, the amount available to the business to cover operating expenses, invest in growth or manage unexpected costs also fluctuates. Interest rate changes can affect cash flow in several ways, including:

• Higher repayments on existing variable-rate loans and other credit facilities, leaving less cash available for day-to-day operations.
• Higher costs for finance products, such as invoice finance and trade credit, where pricing may be influenced by the wider interest rate environment.
• Reduced access to new funding, as lenders may tighten affordability criteria or offer smaller borrowing amounts when interest rates rise, limiting available working capital.

Businesses with seasonal or uneven cash flow may be particularly affected. These businesses generate most of their income during certain times of the year, but still need to meet pre-determined finance repayments during quieter trading periods, putting additional pressure on cash flow. SMEs can prepare for these changes by adopting proper cash flow forecasting practices. Also, reviewing how repayments would change if borrowing costs increased can help identify potential shortfalls and give businesses time to adjust spending, strengthen cash reserves or explore alternative funding options.

Fixed vs Variable Rate Business Finance: Which Is Better When Rates Are Changing?

A fixed-rate business loan provides certainty. The interest rate and repayments remain the same throughout the agreed term, making it easier for a business to predict cash flow. If interest rates rise during the loan term, repayments will not change. However, this certainty can come at a cost, with fixed-rate borrowing often carrying a higher initial interest rate than a comparable variable-rate loan because lenders price in the risk of future rate increases. If interest rates fall, you will not benefit from lower borrowing costs until the loan is refinanced or renewed. 

A variable-rate loan moves in line with the lender’s variable rate, which may change in response to movements in the wider interest rate environment. These loans can initially be lower than fixed rates and allow businesses to benefit if borrowing costs fall. However, repayments can also increase if interest rates rise, making monthly costs less predictable.

In general, a fixed rate may be more suitable when interest rates are relatively low and expected to rise, or when predictable cash flow is a priority. A variable rate may be worth considering when interest rates are high and expected to fall, provided the business can comfortably absorb any increase in repayments if rates do not move as expected.

It is also worth noting that not all business finance products are priced using interest rates. Products such as revenue-based finance and merchant cash advances use a factor rate, which sets the total amount to be repaid at the outset. As a result, there is no variable interest rate to track or fixed rate to choose between.

Neither fixed nor variable rates are inherently better; the most suitable choice will vary from one business to another. Here is a side by side comparison of business loans and cash advances that makes the structural difference clear.

How to Protect Your Business Against Interest Rate Changes

Although UK SMEs cannot influence interest rates, they can take certain steps to manage the risks associated with changing borrowing costs. Here are some of the things businesses can do to help reduce the impact of future rate changes and strengthen the business’s financial resilience.

• Make a list of all loans, overdrafts and credit facilities, noting whether each has a fixed or variable interest rate, its current rate and when the agreement ends. Understanding which facilities are most exposed to rate changes can help identify potential risks.
• Review cash flow forecasts to understand how repayments would change if interest rates increased by one or two percentage points. This can help identify pressure points before borrowing costs rise.
• Fixing the interest rate on some borrowing can provide greater certainty over future repayments and improve cash flow planning. Whether this is the right option will depend on market conditions and the business’s financing needs.
• Building a financial buffer can help businesses manage periods of higher borrowing costs or temporary cash flow pressures without disrupting day-to-day operations.
• Short-term facilities such as overdrafts and revenue-based funding are generally better suited to temporary working capital needs than long-term investment. Using the right type of finance can help reduce unnecessary exposure to rate changes.
• Some forms of finance offer a fixed total repayment agreed at the outset, providing certainty over the overall cost of borrowing regardless of future interest rate movements. Businesses should compare available options carefully to determine which best suits their needs. 

The focus should not be on predicting future interest rate movements, but on understanding how changes could affect the business and ensuring appropriate financing arrangements are in place.

The Takeaway for SME Owners

Interest rates influence more than the cost of borrowing. They can affect cash flow, customer demand, supplier costs and investment decisions, making them an important consideration for businesses of all sizes. Therefore understanding how existing finance is structured, reviewing exposure to interest rate changes and planning for different scenarios can help businesses manage changing market conditions with greater confidence.

For businesses looking for funding that is not linked to interest rate movements, 365 Finance’s revenue-based finance offers a different approach. Instead of charging interest, the total cost of finance is agreed upfront using a factor rate, so the amount to be repaid does not change over the term of the agreement. Repayments are collected as a percentage of card sales, increasing during busier trading periods and reducing when sales are lower, helping repayments move in line with business performance.