Deposit Interest Calculator
What could a lump-sum deposit
be worth at maturity?
Estimate the maturity value after interest and tax using a deposit amount, term, and annual rate.
DEPOSIT MATURITY SCENARIOS
Compare after-tax interest and maturity value
by deposit, rate, and term.
These examples assume 3.5% simple interest and no tax deduction.
Principal, interest, tax, and maturity value are calculated estimates. Actual results can differ because of day-count conventions, rounding, and product terms.
By deposit amount
1 year · 3.5% annual rate · simple interest · no tax deducted
- Principal
- $10,000
- Pre-tax interest
- $350
- Estimated tax
- $0
- After-tax interest
- $350
- Maturity value
- $10,350
- Principal
- $30,000
- Pre-tax interest
- $1,050
- Estimated tax
- $0
- After-tax interest
- $1,050
- Maturity value
- $31,050
- Principal
- $50,000
- Pre-tax interest
- $1,750
- Estimated tax
- $0
- After-tax interest
- $1,750
- Maturity value
- $51,750
- Principal
- $100,000
- Pre-tax interest
- $3,500
- Estimated tax
- $0
- After-tax interest
- $3,500
- Maturity value
- $103,500
By annual rate
Deposit $10,000 · 1 year · simple interest · no tax deducted
- Annual rate
- 3%
- Pre-tax interest
- $300
- Estimated tax
- $0
- After-tax interest
- $300
- Maturity value
- $10,300
- Annual rate
- 4%
- Pre-tax interest
- $400
- Estimated tax
- $0
- After-tax interest
- $400
- Maturity value
- $10,400
- Annual rate
- 5%
- Pre-tax interest
- $500
- Estimated tax
- $0
- After-tax interest
- $500
- Maturity value
- $10,500
By deposit term
Deposit $10,000 · 3.5% annual rate · simple interest · no tax deducted
- Term
- 1 years
- Pre-tax interest
- $350
- Estimated tax
- $0
- After-tax interest
- $350
- Maturity value
- $10,350
- Term
- 2 years
- Pre-tax interest
- $700
- Estimated tax
- $0
- After-tax interest
- $700
- Maturity value
- $10,700
- Term
- 3 years
- Pre-tax interest
- $1,050
- Estimated tax
- $0
- After-tax interest
- $1,050
- Maturity value
- $11,050
How it works
Separate principal growth,
interest, and tax.
01How is a lump-sum deposit different from recurring savings?
A lump-sum deposit places all principal at the start, so the full amount earns interest for the entire term. Recurring savings adds money over time, giving each deposit a different interest period.
Simple interest and monthly compounding
Simple interest applies only to principal. Monthly compounding includes previously earned interest in later calculations. Select the method stated in the product terms.
Tax and deposit protection
The default English estimate does not deduct tax. Enter a custom rate when needed. Deposit insurance coverage depends on the institution, product, and jurisdiction, so verify the applicable protection before opening an account.
Depositing $10,000 for one year at 3.5%
This example uses simple interest and does not deduct tax.
- Principal
- $10,000
- Estimated interest
- $350
- Estimated maturity value
- $10,350
Actual results may differ because of day-count conventions, compounding frequency, rounding, taxes, and product terms.
Frequently asked questions
Is the annual rate the same as my after-tax return?
No. The stated annual rate is before tax. The term, compounding method, and tax rate change the actual return on principal.
Do all term deposits compound monthly?
No. Many use simple interest or another compounding frequency. Choose monthly compounding only when the product terms say so.
What happens if I withdraw early?
An early-withdrawal rate or penalty may apply. This calculator models a deposit held through maturity.
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Please check the entered values.
