Limited company expenses – interest, banking and finance costs

If you run a company, you may need access to finance at some point — loans, overdrafts, or other forms of borrowing. You may also have to pay ongoing fees for banking, car hire, or car purchases through the business.

Here, we look at how finance costs are treated for tax purposes and which typical expenses can be offset against your company’s Corporation Tax bill.

As with all types of business expenses, only costs incurred wholly and exclusively for the purposes of your trade are tax-deductible.

At a glance: allowable vs non-allowable finance costs

Typical finance costs for limited companies

Typical costs include:

• Monthly business bank account ‘service fees’ – charged by most high street banks.
• Overdraft fees.
• Interest charged on business bank loans.
• Interest charged on business credit cards.
• Interest charged on hire purchase agreements.
• Costs related to finance (such as Islamic loans).

Which finance costs are not tax-deductible?

• You cannot claim any personal finance costs, even if you’ve used a personal loan to help fund the business.
• All finance agreements must be in the company name (see below).
• You cannot claim the capital repayment element of a business loan.

What about the costs of buying a company car?

There are many things to consider when working out the tax cost of buying or leasing a company car; however, in simple terms:

Your company can claim back the interest costs of car leasing agreements. However, if you lease a car with CO2 emissions of 50g/km or more, there is a 15% flat rate disallowance on the tax-deductible amount.

If you take out a loan to buy a company car, only the interest payments are allowable business expenses. The tax treatment of the car itself is handled through a system of capital allowances, which will reduce the company’s tax bill.

Your finances must be in the company name

Importantly, as a limited company owner, you must have a separate bank account for your business. The company is a separate legal entity from its directors and shareholders.

All business bank accounts must be in the company name. Take a look at our banking comparison table if you feel you are paying too much with your current supplier.

---

---

Similarly, all other finance agreements must be in the company’s name for related costs to qualify as tax-deductible expenses.

What if you lend your company money?

What about if you lend your limited company money? This may be preferable to taking out a bank loan, and, as it would be an unsecured loan, you would be justified in charging a robust interest rate.

There are a few things you need to bear in mind.

• The interest paid by the company is an allowable expense.
• The company must pay you the interest owed, less income tax, at the basic rate (20%).
• The company has to report and pay the income tax liability each quarter, using form CT61.
• Remember to include any interest received on your personal Self-Assessment form.
• You or your accountant should create a formal agreement that documents the loan amount and interest rate.

Find out more in our complete guide to lending money to your company.

What if your company lends you money?

If your company lends you money, as a business owner, this is known as a director’s loan.

How the loan is treated depends on a number of things, including:

• The loan amount – if it is over £10,000, it may be taxed as a ‘benefit in kind’ for the director.
• When the loan is repaid – if it remains unpaid nine months after the company’s year-end, an S455 33.75% Corporation Tax charge will be levied.

So, what about any interest the company charges on the director’s loan? How is this treated?

The company can charge the official beneficial interest rate of 3.75% (2025/26) on the loan to the director, charge a different rate, or charge no interest at all.

The official rate changes from time to time. You can view the prevailing rate here.

However, a business loan benefits a director personally, so if you don’t charge interest on the loan, then you will face a benefit-in-kind charge equal to the official rate, plus an additional 15% Employers’ National Insurance charge (2025/26) on the amount of the interest.

You can find out how director’s loans work here.

We recommend you talk to your accountant before taking on any finance arrangement, as the tax treatment of many loans (and purchases) can be complex.