Can I Claim Interest in Small Claims Court Northern Ireland?

You are owed money, you have been waiting months, and now you want to know whether you can add interest on top of the original debt when you file your small claims application. The short answer is yes — but the type of interest depends on whether the debt is a consumer dispute or a business-to-business invoice.

Three Types of Interest in Northern Ireland Small Claims

1. Contractual Interest

If your written contract specifies an interest rate for late payment, you can claim that rate. Quote the clause on your application form and show the judge the contract.

This is the most straightforward type. You agreed to it, the other side signed it, and the rate is whatever the contract says.

2. Late Payment of Commercial Debts Act Interest

This applies to business-to-business transactions only — a sole trader chasing an unpaid invoice from a limited company, for example. Under the Late Payment of Commercial Debts (Interest) Act 1998, you can claim:

• Interest at 8% above the Bank of England base rate per year. Check when interest starts under your payment terms before calculating the total.
• Statutory compensation on top of the interest: £40 for debts up to £999.99, £70 for debts between £1,000 and £9,999.99, and £100 for debts of £10,000 or more.

To calculate the daily rate: add 8% to the current base rate, divide by 365, and multiply by the outstanding amount. Then multiply by the number of days the payment is late.

For example, if the base rate is 4.5% and you are owed £2,000 on a business invoice that is 90 days overdue:

• Annual rate: 4.5% + 8% = 12.5%
• Daily interest: £2,000 × 12.5% ÷ 365 ≈ £0.6849 (about £0.68) per day
• 90 days of interest: £2,000 × 12.5% × 90 ÷ 365 = £61.64
• Plus £70 statutory compensation
• Interest plus statutory compensation: £131.64

List this breakdown on your application form. Judges expect to see the working.

3. Post-Judgment Interest

Once the District Judge grants your decree, interest runs on the unpaid amount at 8% per year under Order 33, Rule 2 of the County Court Rules (Northern Ireland) 1981. You do not need to claim this in advance — it applies automatically to all County Court decrees.

This is relevant if the respondent delays payment after losing. Every day they wait, the debt grows.

How to Include Interest on Your Application

The small claims application form has a section for interest. Fill it in with:

• The type of interest you are claiming (contractual or Late Payment Act, as applicable)
• The rate and how you calculated it
• The number of days and the total interest amount to the date of filing
• A note that interest continues to accrue until payment

For a consumer claim, do not assume pre-judgment interest is available: a written contract that specifies an interest rate is one basis for claiming it. The Late Payment Act applies to qualifying business-to-business debts. After a decree, post-judgment interest runs at 8% per year.

Common Mistakes

Claiming Late Payment Act interest on a consumer dispute. The Act covers only commercial debts between businesses. If you bought a faulty sofa from a shop, you are a consumer — the Act does not apply to you.

Forgetting to show the calculation. Do not just write "plus interest." Break it down: rate, daily figure, number of days, total. Judges will not do the maths for you.

Claiming an amount above £5,000. Where the total claim value between the same parties exceeds £5,000, you must abandon the excess on the application or use an ordinary County Court Civil Bill. Splitting one cause of action into smaller claims to get around the limit is prohibited.

Get the Interest Calculation Worksheet

The Making a Small Claim in Northern Ireland guide includes an interest calculation worksheet that walks you through each formula — contractual, statutory, and Late Payment Act — with built-in fields for the base rate, daily amount, and running total.

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