Rental Deposit Interest Calculator
Calculate interest owed on a rental deposit
Enter the deposit amount, the applicable annual interest rate, and the number of months the deposit was held to find out the interest owed and total amount to return.
Rental deposit interest explained for landlords and tenants
A rental deposit is a sum of money paid by the tenant at the start of a lease to protect the landlord against unpaid rent, damages beyond normal wear and tear, or other lease breaches. In many countries and regions, landlords are legally required to hold this deposit in an interest-bearing account and to return both the original deposit and the accrued interest to the tenant at the end of the lease, provided the tenant has met their obligations. Getting this calculation right matters for both parties: tenants want to receive what they are legally owed, and landlords want to avoid disputes or penalty claims for incorrect refund amounts.
The calculation used by this tool is simple interest based on the deposit amount, the applicable annual rate, and the number of months the deposit was held. This is the standard approach used by many tenancy legislation frameworks. Simple interest does not compound, meaning interest is not charged on previously accumulated interest. The formula is: interest = deposit x (annual rate / 100) x (months / 12). The result is the interest earned over the holding period, and the total to return equals the original deposit plus that interest.
The applicable interest rate varies by jurisdiction. In some regions, legislation specifies a fixed prescribed rate, often updated annually by a government body or housing regulator. In other regions, the rate is linked to the savings account rate actually earned on the deposited funds. If you are using this calculator, always verify which rate applies under your local tenancy law. Using the wrong rate, even if unintentional, can lead to underpayment disputes that escalate to tribunal or court proceedings.
What landlords need to know about deposit interest obligations
Landlords who hold deposits are typically required to keep the funds separate from their own money, often in a designated trust or investment account. The interest rate credited to the deposit may be determined by the actual account rate, or by a prescribed statutory rate, depending on your jurisdiction. In some regions, a managing agent or body corporate is responsible for holding the deposit on behalf of the landlord, and they carry the obligation to account for interest correctly.
At lease end, the landlord must provide the tenant with a written breakdown of any deductions from the deposit (for unpaid rent or damages), along with the interest calculation. If the full deposit plus interest is being returned without deductions, a simple statement of the amount is sufficient. Disputes most commonly arise when deductions are made without adequate documentation, or when the interest calculation is incorrect.
Keep records of the deposit receipt date, the account used to hold the deposit, the monthly statements showing the balance, and any correspondence with the tenant about the deposit. These records protect you if the return amount is challenged. They also help you quickly recalculate if the tenant disputes the number of months held or claims a different rate should apply.
What tenants should know about reclaiming deposit interest
As a tenant, you are entitled to receive your deposit back in full, plus interest, if you have met your lease obligations. If your landlord deducts amounts for damages or cleaning, they must provide itemised evidence. If you believe the deduction is unfair, most jurisdictions have a formal dispute process through a tenancy tribunal or housing authority. These processes are designed to be accessible to tenants without legal representation.
If you think the interest amount returned is incorrect, use this calculator to run your own calculation and compare it to what the landlord has stated. You will need to know the deposit amount, the rate that should have been applied (check the relevant legislation for the period in question), and the exact number of months the deposit was held. A discrepancy is grounds for a formal query. Most landlords who have made a genuine calculation error will correct it without a formal dispute once you present your working clearly.
Also note that if your landlord failed to hold the deposit in the required account type, or failed to register it with a deposit protection scheme where one is required, there may be additional remedies available to you under tenancy law. This calculator addresses the interest calculation only and does not cover legal remedies for procedural failures.
