Is Business Savings Interest Taxable?

If your business earns interest on its savings, that interest is taxable income. The question is not whether you pay tax on it, but how that tax is calculated and when it is due. The mechanism differs depending on whether your business is a limited company or run as a sole trader, and getting it wrong can create problems at filing time that are straightforward to avoid with the right understanding upfront.

How It Works for Limited Companies

A limited company pays corporation tax on its profits, and interest earned on savings counts as taxable income within those profits. HMRC categorises savings interest received by a company as a "loan relationship credit," which is included in the company's taxable income for the accounting period in which it was earned.

The rate at which a limited company pays corporation tax on interest depends on its total taxable profits. Companies with profits up to £50,000 pay the small profits rate of 19%. Companies with profits above £250,000 pay the main rate of 25%. Companies between those thresholds pay a blended rate under the marginal relief calculation. For most small limited companies, the effective tax rate on savings interest sits at or close to 19%.

One thing worth understanding clearly is that companies do not benefit from a Personal Savings Allowance. The Personal Savings Allowance, which allows individuals to receive a certain amount of savings interest tax-free each year, applies to individuals, not companies. A limited company pays corporation tax on every pound of interest earned, with no tax-free allowance equivalent.

Interest is taxed on an accruals basis, meaning it is recognised as income in the period it is earned, not necessarily when it is paid into the account. For most straightforward savings accounts where interest is credited regularly, this makes little practical difference. For fixed-term accounts where interest is paid at maturity, the accruals treatment can mean income being recognised across multiple accounting periods even if the cash does not arrive until the account matures.

How It Works for Sole Traders

Sole traders are taxed differently from limited companies because there is no legal separation between the individual and the business. A sole trader's business profits, including savings interest earned on a business savings account, are reported through Self Assessment and taxed as personal income.

The Personal Savings Allowance does apply to individuals, including sole traders, but the way it applies to business savings interest can be complicated. The PSA allows basic rate taxpayers to receive up to £1,000 in savings interest tax-free each year, and higher rate taxpayers to receive up to £500. However, the PSA applies to the individual's total savings interest from all sources combined. A sole trader who also has personal savings will find their allowance shared across both.

For a sole trader whose income already exceeds the higher rate threshold, savings interest is taxed at 40% beyond the £500 PSA. The practical implication is that a sole trader on a higher income earns less after-tax from their business savings than a lower-earning business owner at the same headline rate, which is worth factoring into how you think about the real return on business savings.

Partnerships are treated similarly to sole traders for tax purposes. Each partner declares their share of the partnership's income, including any savings interest, on their own Self Assessment return.

When the Tax Is Due

For limited companies, corporation tax is due nine months and one day after the end of the accounting period in which the income was earned. Interest earned in a company's financial year ending 31 March 2026 would form part of the corporation tax return for that year, with tax due by 1 January 2027.

For sole traders, income tax on savings interest is reported through the annual Self Assessment tax return, which covers the tax year from 6 April to 5 April. The filing deadline for online returns is 31 January following the end of the tax year, with any tax due on the same date.

Neither HMRC nor the savings provider deducts tax at source from business savings interest in most cases. The interest arrives gross, and it is the business owner's responsibility to declare it and pay the tax due. This is different from some personal savings products where basic rate tax was historically deducted at source, though that practice has largely ended.

What You Need to Do in Practice

For most businesses, handling savings interest correctly is not complicated. The steps are the same whether you are a sole trader or a limited company.

Keep a record of interest earned. Your savings account statements will show interest credited during each period. Most accounting platforms will pick this up automatically if the savings account is connected, but it is worth checking that interest transactions are being categorised correctly as income rather than capital receipts.

Tell your accountant. If you use an accountant for your tax returns, making sure they know about any savings accounts and the interest earned ensures it is correctly reflected in your tax filing. Interest income is sometimes missed when accounts are not formally disclosed at the start of the relationship with a new accountant.

Do not assume it is not worth declaring because the amounts are small. HMRC has visibility of interest paid by UK savings providers and cross-references this against tax returns. Undeclared interest, even in modest amounts, can trigger queries that take more time to resolve than the tax itself would have cost.

Consider the tax when comparing savings rates. A 4.4% AER savings rate for a company paying 19% corporation tax produces a net after-tax return of around 3.6%. A 4.4% rate for a higher rate taxpayer produces around 2.6% net. Knowing your effective net return makes it easier to compare savings products and assess whether locking funds away at a fixed rate is worth it on an after-tax basis.