Business loan interest rates: how they're set and how to compare them

A business loan interest rate is the price a lender charges for lending you money, expressed as a percentage of the amount borrowed. Lenders quote that price in different ways, which is why two offers with similar headline figures can cost very different amounts. This guide explains how rates are quoted, what drives them and how to compare offers fairly.

Smart Funding Solutions is a broker: we don't set rates, lenders do. We compare pricing across our panel of 300+ lenders so you can see the real cost side by side. For the products themselves, see our business finance overview.

01How business loan interest is quoted

Interest compensates the lender for the use of its money and the risk that it may not be repaid. Lenders express cost in several ways, so compare like with like:

How it's quoted	What it means	Watch out for
Annual interest rate	Yearly rate on the outstanding balance, which falls as you repay	Excludes fees
APR	Interest plus certain fees, shown as an annual figure	Not always quoted on business lending
Flat rate	Interest on the original amount for the whole term	Looks lower than an equivalent reducing-balance rate
Factor rate	A fixed multiple of the amount advanced, used by merchant cash advances and some short-term products	Total cost is fixed; repaying faster usually saves nothing
Monthly rate	Rate per month, common on bridging and short-term finance	Multiply by twelve for a rough annual comparison

Why a flat rate looks cheaper than it is

With a flat rate, interest is worked out on the full amount you borrowed for the whole term, even though you are paying the balance down every month. On a loan repaid in equal instalments, the equivalent reducing-balance rate can be nearly double the flat rate. Always ask for the total amount repayable or an equivalent annual rate.

How a factor rate works

A factor rate is a multiplier rather than a percentage. You repay the amount advanced multiplied by the factor rate, and that total is fixed at the start. Because the cost doesn't reduce if you repay sooner, a factor rate product repaid quickly can have a very high effective annual cost.

02A simple way to compare any two offers

1. Add up every repayment over the full term.
2. Add arrangement, valuation, legal, broker and any exit fees.
3. Deduct the amount you will actually receive; this is the total cost of borrowing.
4. Divide the total cost by the amount received to get the cost per pound borrowed.
5. Check the monthly repayment against your quietest month.

This works whether one lender quotes an APR, another a flat rate and a third a factor rate, and it stops a low headline figure hiding a higher total.

03Fixed and variable rates

Fixed rates

The rate stays the same for the agreed term, so repayments are predictable. That makes budgeting and managing business loan repayments simpler and protects you if market rates rise. The trade-off is that you do not benefit if rates fall, and early repayment charges may be higher.

Variable rates

The rate moves with a benchmark, typically the Bank of England base rate, plus a margin set by the lender. Repayments fall if the benchmark falls and rise if it increases. Variable-rate facilities can offer more flexibility, such as overpayments without a charge, but you need headroom in your budget for possible increases. Some products include a cap on how far the rate can rise.

This works whether one lender quotes an APR, another a flat rate and a third a factor rate, and it stops a low headline figure hiding a higher total.

04What affects the rate you are offered

Your credit profile

Businesses and directors with clean credit histories represent lower risk and are usually offered lower rates. Defaults, CCJs or missed payments tend to mean higher pricing and fewer options, though bad credit business loans are available from specialist lenders.

Trading history and financial strength

Consistent revenue, healthy margins, manageable existing debt and up-to-date accounts all support better pricing.

Security

A secured business loan backed by property or assets usually carries a lower rate than an unsecured loan, because the lender has something to recover if you cannot repay.

Loan size and term

Longer terms can reduce monthly payments, but you pay interest for longer, so the total cost may be higher. Very small or very short loans may carry higher rates because the lender's fixed costs are spread over less.

The base rate and wider economy

When the Bank of England raises its Bank Rate, borrowing costs across the market generally rise, and vice versa. Lenders' appetite also changes with economic conditions.

The type of product and lender

High street banks, specialist lenders and online platforms price differently. Faster, more flexible products tend to cost more than slower, secured borrowing.

£150,000A transaction we arranged£150K requirement. Two repayment structures. One solution.We split the facility: £78,000 repaid over five years and £72,000 interest-only, so repayments fitted how the business runs.

05Fees that affect the true cost

• Arrangement or origination fees
• Broker fees, where applicable
• Valuation and legal fees on secured loans
• Early repayment or exit charges
• Non-utilisation fees on revolving facilities
• Late payment charges

06How to secure a better interest rate

1. Strengthen your credit profile by paying on time, reducing outstanding balances and correcting errors on your credit files.
2. Get your figures in order. Up-to-date accounts and management figures reduce the lender's uncertainty.
3. Offer security if appropriate, understanding the risk to the asset.
4. Choose the right term, balancing monthly affordability against total cost.
5. Compare offers on total repayable, not the headline rate.
6. Apply selectively. Several hard searches in a short period can make lenders more cautious.

07How to compare business loan quotes side by side

To compare business loan quotes, put each offer into the same table: the cash you actually receive, every repayment, all fees and the total you will pay back. The example below is illustrative only, not a quote from any lender, and shows how a lower headline rate can still cost more.

Illustrative comparison: two offers for £50,000 over 36 months

	Offer A	Offer B
How the rate is quoted	About 9.9% a year on the reducing balance	5% a year flat rate
Arrangement fee (deducted from the loan)	£1,000	£2,500
Cash you receive	£49,000	£47,500
Monthly repayment	£1,610.00	£1,597.22
Total repaid over 36 months	£57,960	£57,500
Total cost (total repaid minus cash received)	£8,960	£10,000
Cost per £1 received	About 18.3p	About 21.1p

Offer B's flat interest is £7,500 (5% of £50,000 for three years), and its monthly payment is slightly lower, so it looks cheaper. Once the larger fee is taken off the cash you receive, it costs £1,040 more than Offer A.

Other columns worth adding

• Early repayment: what you would save, or pay, by settling early. Our guide to paying off a business loan early explains the charges.
• Security and guarantees: a personal guarantee or a charge over property changes the risk, even if the cost is similar.
• Repayment pattern: fixed monthly, seasonal or a percentage of card takings, as with a merchant cash advance.
• Speed and conditions: how quickly funds are released and what must be provided first.

Comparison sites show indicative products; a broker can return offers based on your actual figures, so the table compares real terms. Our guide to how instant business loan quotes work explains what an indicative quote can and cannot tell you.

If you are deciding whether to go direct or use an intermediary, our guide to what a business loan broker does covers how brokers choose lenders and what to ask about fees and commission.

08Compare rates through a broker

We search our panel for lenders whose criteria and pricing suit your circumstances, then set out each offer's total cost so you can compare them fairly. Lenders make the decisions. It is free to enquire; any broker fee is disclosed separately before you proceed. When you are ready, you can start an application online.