Taking a business loan is one of the bigger financial commitments a small business can make. Most business owners focus on the monthly payment and whether they can cover it. That is the wrong question. The right question is what you will actually pay in total by the time the loan is cleared, and whether the return on that borrowing justifies the cost.
This guide explains how loan repayments work, why APR and flat rate quotes can be misleading, what types of finance are available, and what lenders will want to see before they approve you.
Use the Business Loan Calculator to model your specific numbers as you work through this.
How Loan Repayments Are Calculated
Most business loans use amortisation, which means each monthly payment covers both interest and a portion of the principal. In the early months of the loan, most of your payment goes toward interest. As the balance reduces, the proportion going to principal increases.
Here is a simplified example. You borrow £20,000 over 3 years at 8% APR.
Your monthly payment will be approximately £627. Over the full 36 months, you will pay roughly £22,572 in total. The total interest cost is approximately £2,572.
The monthly payment is manageable. But you need to assess whether the thing you are borrowing for will generate more than £2,572 in value over that period. If it will not, the loan does not make financial sense, regardless of whether you can afford the monthly payment.
APR vs Flat Rate: Why Flat Rate Is Misleading
Many lenders, particularly alternative and online lenders, advertise their loans using a flat interest rate rather than an APR. These two figures look similar on the surface but are very different in practice.
APR (Annual Percentage Rate) reflects the actual annualised cost of the loan, including fees, and accounts for the fact that you are repaying the principal over time. It is the standardised figure that lets you compare products accurately.
Flat rate is calculated on the original loan amount for the full term, regardless of the fact that your balance decreases as you repay. A 5% flat rate applied to a £20,000 loan over 3 years means you pay £3,000 in interest (5% x £20,000 x 3 years). But because you are repaying the principal throughout, you do not have the full £20,000 for the entire 3 years. The effective APR on that flat rate loan is closer to 9-10%.
The practical result: a lender advertising a 5% flat rate is not offering you a 5% loan in the way that phrase would suggest. Always convert to APR before comparing products. If a lender does not want to tell you the APR, that is a red flag.
Total Cost vs Monthly Payment
The monthly payment is what gets quoted in marketing material because it is the smaller number. The total cost is what you actually pay.
On the same £20,000 loan example:
- 8% APR, 2-year term: monthly payment £905, total paid £21,720, interest £1,720
- 8% APR, 5-year term: monthly payment £406, total paid £24,360, interest £4,360
The 5-year loan looks more affordable month to month. But you pay more than twice as much interest over the life of the loan. A longer term is not always the right answer. Take the shortest term you can genuinely afford, not the longest one that gives you breathing room.
If you are unsure which structure works for your situation, use the Cash Flow Forecast alongside the loan calculator to see how different monthly payment amounts affect your overall business cash position.
Types of Business Finance
Not every financing need requires a traditional term loan. Understanding your options helps you choose the right product.
Term loan. A fixed amount borrowed at a fixed or variable rate, repaid over an agreed period. Best for one-time investments: equipment, refurbishment, expansion. Predictable payments make budgeting straightforward.
Revolving credit facility. A credit line you draw on as needed and repay, similar to a business overdraft but often with a higher limit. You pay interest only on what you draw. Best for managing cash flow gaps rather than capital investment.
Asset finance. Borrowing secured against a specific asset, often the asset you are purchasing (vehicle, machinery, equipment). The lender takes an interest in the asset. Often lower rates because the risk is secured. Includes hire purchase and leasing arrangements.
Invoice finance. You sell your outstanding invoices to a lender at a discount and receive most of the cash immediately, rather than waiting 30 or 60 days for clients to pay. The lender takes a percentage fee. Particularly useful for businesses with large B2B invoices and slow-paying clients.
Merchant cash advance. An advance against future card sales, repaid as a percentage of daily card transactions. Expensive and only suitable in specific situations. Be cautious.
Government-Backed Startup Loans
If you are starting a new business or have been trading for less than 3 years, the Government's Start Up Loans scheme is worth considering. As of 2026, it offers personal loans of £500 to £25,000 at a fixed interest rate of 6% per annum, with 1 to 5 year repayment terms. Critically, it is available to businesses that might not qualify for commercial lending yet.
The application process involves submitting a business plan and cash flow forecast. Successful applicants also receive free mentoring support. The loan is a personal loan rather than a business loan, which means it affects your personal credit history, not a business credit file.
The British Business Bank administers the scheme. Check eligibility and current terms on their website, as details can change.
What Lenders Actually Look For
Understanding what lenders assess helps you prepare a stronger application and understand why you might be declined.
Credit history. For small businesses, most lenders will check both the business credit file (if the business is established) and the personal credit file of the directors. A history of late payments, CCJs (County Court Judgments), or defaults will significantly reduce your options and increase the rate you are offered.
Time in business. Most high street banks want to see at least 2 years of trading history. Alternative lenders often accept 12 months. Startup lenders like the Start Up Loans scheme accept pre-revenue businesses with a viable business plan.
Revenue and profitability. Lenders want to see that your business generates enough income to service the debt. They will typically look for coverage of 1.25 to 1.5 times the annual loan repayment in annual profit or EBITDA.
Existing debt. The amount you already owe affects how much a new lender is prepared to advance. High existing debt-to-revenue ratios reduce borrowing capacity.
Purpose of the loan. Lenders are more comfortable lending for specific, asset-backed purposes (equipment, property, vehicles) than for working capital or vague "business growth" reasons. Being specific about what you are borrowing for helps.
Security. Secured loans typically offer lower rates because the lender has recourse to an asset if you default. Unsecured loans are more expensive. Some lenders require a personal guarantee, which means you become personally liable if the business cannot repay.
Questions to Ask Before You Sign
Before committing to any loan, get clear answers to these questions:
- What is the APR, including all fees?
- What is the total amount repayable over the full term?
- Is the rate fixed or variable? If variable, what is the maximum it can reach?
- What are the early repayment terms? Is there a penalty for paying off early?
- Is a personal guarantee required? What does that mean in practice?
- What happens if you miss a payment?
- Are there arrangement fees, administration fees, or exit fees on top of interest?
A lender who is reluctant to answer these questions clearly is one you should be cautious about.
Making the Decision
A business loan can accelerate growth that would otherwise take years. It can also become a burden that constrains the business if taken for the wrong reasons or at the wrong time.
Before borrowing, run the numbers honestly. What return does this investment produce? How does that return compare to the total cost of the loan? What happens to your cash flow if sales are 20% lower than expected?
The Business Loan Calculator lets you model the monthly payment and total cost for any combination of loan amount, term, and interest rate. Run several scenarios before you approach a lender: the optimal amount and term for your situation may not be the first number you consider.