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Rent Arrears Calculator for UK Landlords and Tenants
This calculator helps landlords and tenants in the United Kingdom determine the exact amount of overdue rent, including any contractual interest that may apply. Understanding your arrears is the first step towards resolving a payment issue or, if necessary, beginning formal proceedings.
How Rent Arrears Are Calculated
The calculation follows a logical sequence based on the terms of your tenancy agreement. First, we establish the principal amount of rent owed. This is done by identifying the number of complete rent periods (weeks or months) that have passed since the first missed payment date up to your chosen calculation date. For monthly rents, a period is considered complete if the day of the month for the payment due date has passed on the calculation date. The rent for each of these periods is summed.
Any payments the tenant has made towards the arrears are then subtracted from this principal amount. Finally, if your tenancy agreement includes a clause for interest on late payments, that interest is calculated on the remaining principal. The interest is applied on a daily basis from the first missed payment date until the calculation date.
A Worked Example
Imagine a monthly rent of £1,200, due on the 1st of each month. The tenant missed their payment due on July 1st, 2026. By October 20th, 2026, they have made no further payments, and the agreement specifies no interest for late rent.
- Days in Arrears: From July 1st to October 20th is 111 days.
- Complete Periods: Payments due on July 1st, August 1st, September 1st, and October 1st have all been missed. That's 4 full months.
- Principal Arrears: 4 months x £1,200 = £4,800.
- Interest: 0%.
- Total Owed: £4,800.
If the agreement had a 5% annual interest rate, daily interest would be added to the £4,800 principal for the 111-day period.
Eviction Grounds and Legal Thresholds
Under Ground 8 of the Housing Act 1988, a landlord may seek possession if the tenant has accrued rent arrears of at least 2 months (for monthly tenancies) or 8 weeks (for weekly tenancies) both at the time of serving notice and at the time of the court hearing. This calculator shows you if this legal threshold has been met based on the number of complete periods missed. Reaching this threshold is a serious matter and is a prerequisite for serving a Section 8 eviction notice on Ground 8, but it does not guarantee possession; a court order is still required.
Next Steps and Useful Documents
If arrears are identified, the recommended first step is formal, written communication. A Letter to Request Arrears of Rent clearly states the amount owed, the period covered, and can propose a payment plan. This document is often sufficient to resolve the issue amicably.
If the arrears persist and meet the legal threshold, a landlord may need to proceed with an Eviction Notice (specifically a Section 8 notice). This is a formal legal step and should be undertaken with care, often with professional advice.
Once payments resume, providing a Rent Receipt for any payment received helps maintain clear records for both parties.