How UK business loans work
A UK business loan is commercial debt issued by an FCA-regulated lender, PRA-regulated bank or unregulated commercial lender to a limited company, LLP, partnership or sole trader. The core mechanics are five: term (typically 6 to 84 months), rate (fixed or variable APR, sometimes per-month or factor rate), repayment schedule, security (secured against assets or unsecured), and personal guarantee from a director. This guide explains each in plain English. Start here if you are taking your first loan.
Director, BestBusinessLoans
Oliver leads BestBusinessLoans's editorial reviews and methodology. With a background in UK commercial finance, he oversees lender research, rate verification and review independence.
Last reviewed: 26 April 2026
What a UK business loan actually is
A contract between your business and a lender. The lender advances a sum (the principal); your business repays principal plus interest over a fixed period (the term). Most UK SMB loans are fully amortising, equal monthly payments that cover both interest and principal, and most are unsecured but require a director personal guarantee.
How rate is decided
UK lenders price against the Bank of England base rate (current 3.75% as of April 2026), the lender's funding cost, the lender's margin requirement, the credit score and trading time of the borrower, and the security on offer. The rate range a lender publishes (e.g. "from 6.9%") is the rate the cleanest applicant gets; most applicants land above the headline.
How repayment works
Equal monthly payments by direct debit are the default. Some lenders offer flexi-loans (you draw against an approved facility and only pay interest on what is drawn) or merchant cash advance (you repay a fixed percentage of daily card-machine takings). Each has a different cost shape.
Security and personal guarantees
Most UK SMB term loans are unsecured against company assets but require a personal guarantee from at least one director. The PG makes the director personally liable if the company cannot pay. Any charge over company assets is registered at Companies House and visible to other lenders. Limited PGs cap the director's exposure (e.g. £50k) regardless of the loan size; unlimited PGs do not.
How early repayment works
Most UK SMB lenders allow early repayment without penalty after an initial period. Some charge an early-repayment fee equivalent to interest you would have paid; check the contract before you sign. Flexi-loans often have no early-repayment penalty by structure.
FAQ
How much can my business borrow?
Most UK SMB lenders cap unsecured term loans at 25% to 30% of your annual turnover, and require monthly repayment to stay under 30% to 40% of free cash flow. Asset-backed and commercial mortgage products go higher relative to turnover.
Will my business credit score affect the rate?
Yes, materially. Score differences of 100 points can change your offered rate by 3 to 5 percentage points on the same product.
Reviewed by Oliver Mackman, Director. Last reviewed: 2026-04-26.