Calculate Your Business Loan Repayments

A business loan calculator takes three inputs and returns an estimate of what your borrowing will cost each month and over the full term. You enter your desired loan amount, the annual interest rate you expect to pay, and the repayment term in years or months. The calculator applies the standard amortisation formula to produce three key figures: your estimated monthly repayment, total interest payable, and total amount repaid.

The formula behind the calculator is the same one used for any fixed-rate amortising loan. It splits your total debt into equal monthly instalments that cover both interest and principal, with the interest portion decreasing and the capital portion increasing as you progress through the term. Early payments are interest-heavy, while later payments are mostly principal. This pattern is called amortisation, and it determines how quickly you reduce the outstanding balance.

Understanding each input

Loan amount: the total sum you want to borrow. UK business loans typically range from £1,000 for short-term working capital up to £500,000 or more for larger investments such as commercial property or equipment. The amount you can actually borrow depends on your annual turnover, trading history, and whether you provide security against the loan.

Interest rate: the annual percentage charged on your outstanding balance. Business loan interest rates in the UK currently range from around 4% for well-established businesses with strong credit profiles up to 20% or higher for newer businesses, those with thin credit files, or unsecured business loans without collateral. The calculator uses the headline annual rate. Your actual APR may differ once arrangement fees and other charges are included.

Repayment term: how long you take to repay, usually between 1 and 25 years. Stretching the term reduces your monthly payment but increases the total interest you pay. A 5-year term on a £50,000 loan at 7% costs £9,412 in interest. Extend that to 10 years and the monthly payment drops by roughly 40%, but total interest rises to over £19,000.

What the calculator shows you

The outputs assume a fixed interest rate and equal monthly payments throughout the term. If you are considering a variable-rate product, your actual payments could fluctuate as the lender's base rate changes. Similarly, the figures do not include arrangement fees, early repayment charges, or other costs that your lender may apply. Use the results as a reliable starting point for comparing different small business loan scenarios before requesting formal quotes from lenders.

The amortisation schedule behind these figures shows exactly how each monthly payment is split between interest and capital. For a £50,000 loan at 7% over 5 years, your first monthly payment of £990 includes £292 in interest and £698 in capital repayment. By the final month, just £6 goes to interest and £984 repays principal. Understanding this pattern is particularly useful if you are considering early repayment, as clearing the loan in the first half of the term saves a proportionally larger amount of interest.

Running different scenarios through the business loan calculator reveals how loan size, interest rate, and term length interact to determine your total cost of borrowing. Below are three UK-relevant examples covering different scales of business investment, each showing the monthly repayment, total interest, and total amount repaid.

Example 1: £10,000 at 9% over 3 years

A sole trader borrowing £10,000 to purchase initial stock and equipment at 9% annual interest over a 3-year term would pay approximately £318 per month. The total interest over 36 months comes to £1,440, making the full cost of borrowing £11,440. At this rate, roughly 14.4% of the original loan amount goes to interest charges. This scenario is typical for early-stage businesses funding their first year of operations or covering a specific short-term investment.

Example 2: £50,000 at 7% over 5 years

A limited company borrowing £50,000 for premises refurbishment or hiring at 7% annual interest over 5 years would pay approximately £990 per month. Total interest over 60 months reaches £9,412, bringing the total repaid to £59,412. Extending the same loan to 7 years drops the monthly payment to around £751 but pushes total interest to £13,084, an increase of £3,672 for the extra two years of borrowing. This example shows the trade-off between monthly affordability and overall cost.

Example 3: £250,000 at 6% over 10 years

An established business borrowing £250,000 for commercial property or major equipment, secured against business assets, at 6% annual interest over 10 years would pay approximately £2,776 per month. Total interest over 120 months amounts to £83,061, with a total repayment of £333,061. The lower rate reflects the reduced risk to the lender when assets are offered as security, but the extended term generates substantial cumulative interest despite the competitive rate.

Key patterns from these examples

These figures highlight two dynamics that apply to all business borrowing. First, larger loans at lower rates can still generate substantial interest charges over longer terms. The £250,000 example costs over £83,000 in interest despite a competitive 6% rate, purely because of the 10-year duration. Second, even small differences in rate have a significant impact. If the £50,000 loan were offered at 9% instead of 7%, total interest would rise from £9,412 to £12,246, an extra £2,834 in borrowing costs over the same 5-year term.

When using the business loan repayment calculator for your own scenario, try entering at least three different rate assumptions: the best rate you might qualify for, the rate your lender has indicated, and a worst-case rate 2-3 percentage points higher. This gives you a realistic range of outcomes and helps you set a budget that accounts for uncertainty. If you are in the early stages of trading and expect higher rates, startup loans offer government-backed options with rates capped at 6%.

Your business loan calculator estimate gives you a useful baseline, but the actual rate and terms a lender offers depend on several factors beyond the simple inputs. Understanding what drives your borrowing cost helps you enter more realistic assumptions and interpret your results with confidence.

APR vs headline interest rate

The interest rate shown on a loan product is not always the full cost of borrowing. The annual percentage rate (APR) includes mandatory fees such as arrangement charges and gives a more accurate picture of the total yearly cost. A loan advertised at 7% interest with a 2% arrangement fee added to the balance effectively costs more than 7% in real terms. When using the business loan APR calculator, if you know the arrangement fee, add it to the loan amount to see a more realistic monthly payment figure. This simple adjustment bridges the gap between the advertised rate and what you will actually pay.

Arrangement and broker fees

Most business loan lenders charge an arrangement fee, typically between 1% and 3% of the loan amount. On a £100,000 loan, that adds £1,000 to £3,000 to your borrowing. Some lenders let you pay this upfront, while others add it to the loan balance, increasing both your monthly payments and total interest. Early repayment charges (ERCs) typically range from 1% to 5% of the outstanding balance if you settle the loan before the agreed term ends. These charges are not reflected in a standard calculator output, so factor them in when assessing overall affordability.

Business credit profile and trading history

Lenders assess your business credit score, personal credit history (for directors or sole traders), annual turnover, profitability, and how long you have been trading. A business with 3 or more years of audited accounts and a turnover above £250,000 will typically access rates 3-6 percentage points lower than a business trading for under 12 months. If your credit history is imperfect, the rates you should enter into the calculator will be toward the higher end of the ranges shown below. Specialist providers offering bad credit business loans can advise on what rates to expect for your specific circumstances.

Secured vs unsecured borrowing

Offering property, equipment, or other assets as security reduces the lender's risk and usually lowers your rate by 2-5 percentage points compared with an unsecured loan of the same size. However, secured loans put your assets at risk if you cannot maintain repayments. The trade-off between lower monthly costs and higher personal risk is one of the most significant decisions when choosing how to structure your borrowing.

Not all business borrowing works on the same repayment model. The calculator on this page uses a standard amortising repayment structure, which applies to most term loans. Other finance products work differently, and understanding these differences helps you decide which type to model and when the standard business loan calculator results apply.

Term loans (secured and unsecured)

The most common type of business borrowing. You receive a lump sum and repay it in equal monthly instalments over an agreed term, typically 1-25 years. This is exactly what the calculator models. Secured term loans, backed by property or equipment, offer lower rates but require collateral. Unsecured term loans need no security but carry higher rates and are usually capped at lower amounts, often £250,000 or less.

Asset finance

Asset finance lets you spread the cost of vehicles, machinery, or equipment over 2-7 years. The asset itself acts as security, so rates tend to be competitive at typically 4-10%. You can model basic asset finance in the calculator by entering the asset value, the quoted rate, and the term. However, some agreements include a balloon payment at the end, which the standard calculator does not account for.

Invoice finance

Invoice finance works differently from a term loan. The lender advances 80-90% of your outstanding invoices and charges a service fee (typically 0.5-3% of invoice value) plus a discount charge on the amount advanced. Because costs are tied to invoice volume rather than a fixed loan balance, the calculator does not model invoice finance accurately. Costs depend on your monthly invoice volume and how quickly your customers pay.

Merchant cash advance

A merchant cash advance provides an upfront sum repaid through a percentage of your daily card takings. The cost is expressed as a factor rate (typically 1.2-1.5x) rather than an annual interest rate, making direct comparison with term loans difficult. A £20,000 advance with a 1.3 factor rate means you repay £26,000 in total, regardless of how long repayment takes.

Government-backed schemes

The UK government currently offers several government business loan programmes. Start Up Loans provide up to £25,000 at a fixed 6% per year, which you can model directly in the calculator. The Growth Guarantee Scheme backs loans up to £2 million through accredited lenders, with the government guaranteeing 70% of the balance. Rates under these schemes vary by lender but are typically lower than fully commercial alternatives because the government guarantee reduces lender risk.

The figures your business loan calculator produces are estimates based on the inputs you provide. A formal lender quote will almost always differ, sometimes by a significant margin. Understanding why helps you use the calculator more effectively and avoid surprises during the application process.

Why real quotes differ from calculator estimates

Personalised rates: the rate a lender offers depends on your credit score, trading history, turnover, sector, and whether you offer security. Two businesses borrowing the same amount from the same lender can receive rates several percentage points apart. The calculator cannot account for this personalisation until you have a formal indicative rate.

Fee structures: arrangement fees, broker fees, and legal charges are not captured in a simple rate-based calculation. A lender quoting 7% interest with a 2% arrangement fee costs more overall than one quoting 8% with no fee, but the calculator alone will not show this difference unless you manually adjust the loan amount upward to include the fee.

Non-standard repayment structures: some lenders offer interest-only periods at the start of the loan, seasonal payment schedules for businesses with cyclical revenue, or capital holidays during quieter trading months. These change both the monthly amount and total interest compared with a standard amortising calculation.

How to use your estimate when comparing quotes

Run three versions of each scenario in the business loan cost calculator: one at the rate you hope to achieve, one at a mid-range rate, and one at a pessimistic rate 2-3 points higher. This gives you a range rather than a single figure. When a lender provides a formal illustration, compare it to your mid-range scenario. If the quoted rate or total cost falls well above your pessimistic estimate, ask the lender to explain the additional charges driving the higher cost.

Take your calculator results to at least three lenders or use a whole-of-market broker who can access the full UK market. The estimate becomes a negotiation tool, helping you identify which quotes offer genuine value and which carry hidden costs. Requesting a quote from most business lenders requires only a soft credit check, which does not affect your credit score. You can gather several formal illustrations without any downside, using your calculator estimates as the benchmark for comparison.

Before spending time with the business loan calculator, it helps to understand the basic eligibility criteria that UK business lenders apply. Meeting these requirements does not guarantee approval, but falling short on any of them may limit your options or push you toward higher-rate products.

Trading history: most mainstream lenders require at least 12 months of trading, though some alternative lenders consider businesses trading for 6 months or more. Government-backed Start Up Loans are specifically designed for businesses under 3 years old and do not require extensive trading records.

Annual turnover: lenders use turnover as a guide to affordability. For unsecured loans, expect to demonstrate annual turnover of at least 1.5 to 2 times the loan amount. A business seeking a £50,000 unsecured loan would typically need turnover of £75,000 or more to satisfy affordability checks.

Credit history: both your business credit score and personal credit history (as a director or sole trader) are assessed. Missed payments, CCJs, or defaults within the past 3 years will limit your access to competitive rates, though specialist lenders exist for borrowers in this position.

Business plan and projections: lenders want evidence that you can afford the repayments alongside your existing commitments. For larger loans above £50,000, expect to provide cash flow forecasts, management accounts, and a clear explanation of how the funds will be used and how they will generate returns for the business.

Security: for secured loans, the lender will value any property, equipment, or other assets you offer as collateral. A personal guarantee from directors is common for limited company borrowing, especially for unsecured facilities above £25,000.

Sector and risk profile: some industries carry higher perceived risk. Hospitality, construction, and retail businesses may face tighter lending criteria or higher rates than professional services, technology, or manufacturing firms with predictable revenue streams.

The business loan calculator on this page models fixed-rate repayments, where the interest rate stays constant throughout the term. This gives you a predictable monthly figure that will not change. Many UK business loans, however, are offered on variable or tracker rates that move with the Bank of England base rate or the lender's own standard variable rate.

Fixed rate loans

Your monthly payment stays constant from the first month to the last. This makes budgeting straightforward and means the calculator output directly matches what you will pay each month. Fixed rates are typically 0.5-1.5 percentage points higher than the equivalent variable rate at the point of borrowing, reflecting the cost of certainty. Fixed terms commonly range from 2 to 10 years, after which the loan may revert to a variable rate if not fully repaid.

Variable rate loans

Your monthly payment changes when the underlying rate moves. If you enter a variable rate into the calculator, the output shows what you would pay at today's rate, but actual payments could increase or decrease over time. To stress-test a variable rate scenario, run the calculator at your current rate, then again at 2 and 3 percentage points higher. This shows the range of monthly payments you might face if rates rise, which is essential for long-term cash flow planning.

Which rate type suits your business

Fixed rates suit businesses that need certainty for cash flow planning, especially those with tight margins or seasonal revenue patterns. Variable rates can start lower and save money if rates remain stable or fall, but they introduce the risk that your costs could increase. If you are borrowing for a startup with limited cash reserves, the predictability of a fixed rate may outweigh the potential savings of a variable deal. Some lenders offer a blend: a fixed period of 2-3 years followed by a variable rate for the remainder of the term. When modelling this type of arrangement, run two separate calculator estimates covering each phase and combine the interest costs for a more accurate total figure.

If you want to verify the business loan calculator output or understand the maths behind the figures, you can calculate your monthly repayment by hand using the standard amortisation formula. This walkthrough uses a £25,000 loan at 8% annual interest over 4 years (48 monthly payments) as a worked example.

Step 1: convert the annual interest rate to a monthly rate. Divide 8% by 12, giving 0.6667% or 0.006667 as a decimal.

Step 2: calculate (1 + monthly rate) raised to the power of the total number of payments. That is 1.006667 to the power of 48, which equals approximately 1.3757.

Step 3: multiply the monthly rate by this result. 0.006667 multiplied by 1.3757 gives 0.009172.

Step 4: subtract 1 from the Step 2 result to get the denominator. 1.3757 minus 1 equals 0.3757.

Step 5: divide Step 3 by Step 4. 0.009172 divided by 0.3757 gives 0.024416.

Step 6: multiply by the loan amount. £25,000 multiplied by 0.024416 gives a monthly payment of approximately £610.

Total repaid: £610 multiplied by 48 months equals £29,280. Total interest: £29,280 minus £25,000 equals £4,280.

This method works for any fixed-rate amortising loan. For quick estimates without a calculator, a useful rule of thumb: each £1,000 borrowed at 8% over 5 years costs roughly £20.30 per month. At 6%, the same £1,000 costs approximately £19.33 per month. These approximations are useful for mental arithmetic when comparing options on the spot, though the full formula provides more precise results.

To build a full amortisation schedule, take each month's outstanding balance, multiply it by the monthly rate to get that month's interest charge, then subtract the interest from your fixed monthly payment to find the principal repaid. Reduce the outstanding balance by the principal amount and repeat for the next month. This creates a month-by-month table showing how your debt reduces over the full term, and reveals exactly how much interest you save by making early repayments at any point during the loan.

Once the business loan calculator has helped you identify a realistic borrowing range, you will need to gather documentation before approaching lenders for formal quotes. Having your paperwork ready speeds up the application process and demonstrates that your business is organised and creditworthy.

Bank statements: most lenders require 3-6 months of business bank statements showing regular income and expenditure patterns. Some ask for 12 months for loans above £100,000. These statements should be from your primary business account and show consistent trading activity.

Filed accounts: if your business has been trading for more than a year, you will need your most recent filed accounts. Limited companies should provide 2-3 years of accounts if available, including profit and loss statements and balance sheets. Sole traders and partnerships should have self-assessment tax returns covering the same period.

Management accounts: for the current financial year, up-to-date management accounts showing profit and loss, balance sheet position, and cash flow give lenders a current performance snapshot beyond the most recently filed annual accounts.

Business plan: lenders considering larger loans or startup applications want to see a clear plan explaining how the funds will be used, projected revenue for the next 12-24 months, and how you intend to meet repayments from trading income.

Proof of identity and address: directors and significant shareholders will need to provide photo ID (passport or driving licence) and proof of address (utility bill or bank statement dated within the past 3 months).

Asset valuations: for secured loans, you may need professional valuations of property, equipment, or other assets being offered as collateral. The lender will typically arrange formal valuations, but having your own estimate speeds up initial discussions and helps set realistic expectations on borrowing limits.

Interest rates for UK business loans reflect the Bank of England base rate, lender risk appetite, and competition in the market. As of mid-2026, the base rate sits at 4.5%, which acts as the floor for most variable-rate lending. Fixed-rate business loans typically start from around 4% for the strongest borrowers and extend to 25% or more for higher-risk lending.

The market currently divides into three broad tiers. High-street banks and established online lenders offer the most competitive rates, typically 4-9% for secured loans and 6-12% for unsecured borrowing. They tend to require 2 or more years of trading history, clean credit, and robust financials. Alternative lenders fill the gap for businesses that do not meet high-street criteria, offering rates from 8% to 18% with faster decisions and more flexible requirements. Specialist lenders serving startups, adverse credit, or niche sectors charge 12-25% but provide access to funding that would otherwise be unavailable.

When entering a rate into the business loan interest rate calculator, use the ranges above as a starting guide, then adjust based on your specific circumstances. If your business has been trading for over 3 years with no credit issues and turnover above £500,000, test rates in the 4-7% range. If you have between 1-3 years of solid but short trading history, 7-12% is more realistic. For businesses under 12 months old or with credit challenges, model 12-18% to see whether the monthly payments remain affordable within your projected cash flow.

Rate trends also matter for your calculator assumptions. If the Bank of England base rate is expected to fall, variable-rate loans may become cheaper over time, reducing your actual payments below the calculator estimate. If rate rises are anticipated, locking into a fixed rate now could save money over the full term. Running the calculator at several rate points gives you the range of outcomes you need to plan for either scenario, and a whole-of-market broker can provide current rate forecasts specific to your sector and borrowing profile.