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Many jurisdictions require landlords to place tenant security deposits in interest-bearing accounts. The interest earned typically belongs to the tenant, though rules vary on when and how it should be paid out. Some areas mandate annual interest payments, while others allow landlords to add the accrued amount to the final refund when the lease ends. Tracking this interest ensures you receive all funds owed at move-out.

This calculator helps tenants and landlords alike estimate deposit interest. By entering the initial amount, the annual interest rate, and the time span, you can see how much the deposit grows. For simplicity, the formula here assumes simple interest and does not compound. However, if your lease or local regulations specify compounding, you could adjust the result accordingly.

Imagine you paid a $1,500 security deposit with a 1% annual interest rate. After one year, the interest would be $15. If your lease lasted two years, you’d earn roughly $30. While these amounts may seem small, they can add up over long tenancies or larger deposits. Some areas also impose penalties on landlords who fail to handle deposits properly, so understanding the numbers is worthwhile.

Security deposit laws vary widely by state and even by city. Some places require landlords to place deposits in separate escrow accounts. Others allow commingling with regular funds but demand that interest be calculated annually. Reading the exact statutes in your area helps you know your rights and obligations. Landlords who hold deposits in interest-bearing accounts sometimes provide annual statements summarizing accruals.

Tenants can use this calculator to verify the interest amounts listed on such statements. If the numbers don’t match your calculations, ask the landlord for clarification. In some disputes, tenants have successfully recovered unpaid interest by demonstrating the correct figures. Keeping records of deposit amounts and any increases during renewal periods makes this process much easier.

Some jurisdictions offer very low mandated rates that barely exceed typical savings account returns. Others tie the required interest to a benchmark such as the federal funds rate or local bank averages. The idea is to compensate tenants fairly while acknowledging that deposit interest is usually minimal. In high-rent areas where deposits may exceed several thousand dollars, however, even a modest rate can generate significant sums over time.

Landlords may deduct allowable charges from the deposit at move-out, such as unpaid rent or repair costs. Interest typically accrues on the balance before any deductions. Make sure you review the itemized list of deductions to confirm the final interest calculation aligns with your lease agreement and local rules. If you believe a deduction is improper, check your state’s procedures for disputing charges.

When you input dates into this calculator, it counts the number of days between them and prorates interest accordingly. You can select any start and end date, which is useful for partial-year tenancies or prorated interest when moving in mid-month. Simply ensure that the annual interest rate you enter reflects your lease terms or local statute.

While this tool is designed primarily for tenants, landlords can benefit as well. Accurately calculating interest demonstrates compliance with the law and fosters trust with renters. Providing clear statements of interest earned can help avoid disputes and encourage lease renewals. If you manage multiple properties, consistent record-keeping across all deposits is a sound business practice.

The simple interest formula used here is Interest = Principal × Rate × Time. Time is expressed in years, so a six-month period would be 0.5 years. Our JavaScript code automatically converts days to years by dividing the total day count by 365. This approximation is sufficient for basic planning, though you can adapt it for leap years or compounding if necessary.

Let’s take a hypothetical example. Suppose your $1,200 deposit accrues interest at 1.5% annually. You rent the property for eighteen months, which is about 1.5 years. The interest would be $1,200 × 0.015 × 1.5, or $27. That amount could cover small moving expenses or a celebratory meal after you get your deposit back. Knowing the math keeps both parties accountable.

If you discover that a landlord has not followed local deposit laws, you may be entitled to additional damages or even a multiple of the deposit in some jurisdictions. Conversely, landlords who maintain transparent records are better positioned to defend against claims. Either way, clear calculations help prevent misunderstandings and promote smoother tenant-landlord relationships.

Use this calculator as a guide, but always confirm the specifics of your lease and local regulations. Even small errors in dates or rates can change the final amount. When in doubt, consult a legal professional familiar with landlord-tenant law in your area. Armed with accurate numbers, you can protect your rights and ensure a fair outcome when your lease concludes.