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Home, Property & Mortgages

Security Deposit Interest Calculator

Calculate interest owed on a rental security deposit between two dates, using simple or annually compounded interest.

Your inputs

Only some jurisdictions require interest — enter the rate that applies to you.

Results

Interest owed

$40.05

Deposit + interest
$2,040.05
Days held
731

✓Exact calculation — rounded only for display

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

Some jurisdictions require landlords to pay interest on security deposits. Enter the rate that applies to you and the dates the deposit was held.

Formula and method

Simple: interest = deposit × rate × days ÷ 365 Compounded annually: interest = deposit × ((1 + rate)^(days/365) − 1)

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Deposit amount: 2000 (any currency)
  • Annual interest rate required or paid: 1 %
  • Date deposit was paid: 2024-01-01
  • Date deposit is returned: 2026-01-01
  • Interest method: Simple interest

Results

  • Interest owed: 40.05
  • Deposit + interest: 2,040.05
  • Days held: 731

How to read the results

Check whether your jurisdiction specifies simple or compound interest and how often it must be paid.

Assumptions and limitations

  • Only some places require interest; this tool does not determine whether it applies to you.

Financial results are estimates based on the inputs and assumptions shown. They are not financial advice; confirm figures with your lender, provider or a qualified adviser before making decisions.

Questions

What rate should I use?

The rate set by local law or your lease, or the rate actually earned on the deposit account.

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy