Savings interest calculator
Enter the amount, rate and months, then pick the country whose tax applies to you.
What you enter stays on this page and is not sent anywhere.
- You get after 12 months
- $10,300.00
| Deposited | $10,000.00 |
|---|---|
| Interest before tax | $300.00 |
| Tax | $0.00 |
| Interest after tax | $300.00 |
What the money really earns
- Effective rate before tax
- 3%
- Effective rate after tax
- 3%
Source, checked October 19, 2026: IRS: Topic no. 403, Interest received, National Tax Agency Japan: Tax Answer 1310, interest income, Einkommensteuergesetz § 32d, Einkommensteuergesetz § 20 Abs. 9, Solidaritätszuschlaggesetz 1995 § 4, Bundeszentralamt für Steuern: Automatischer Informationsaustausch zur Kirchensteuer (Mustertext), Service-Public.fr: Impôt sur le revenu, revenus d'épargne et de placement, BOE: Ley 35/2006 (IRPF), texto consolidado, BOE: Real Decreto 439/2007, Reglamento IRPF, art. 90, Planalto: Lei nº 11.033/2004, arts. 1º e 3º, Planalto: Lei nº 8.981/1995, art. 68, III
How to use it
- Choose a one-off deposit or a monthly savings plan and type the amount, rate and months.
- Pick simple interest or monthly compounding, as your bank states it.
- Choose the country for the tax, or enter your own rate, and read the amount you get at the end.
Questions
Why does a monthly savings plan earn less than its rate suggests?
Each deposit only earns interest from the month it goes in. On a 12-month plan the first deposit earns 12 months, the last only one, so the interest is about 13/24 of what the whole sum would earn for a year.
Is tax withheld from savings interest in the US?
Usually not. Banks report interest of $10 or more on Form 1099-INT, and you pay federal income tax on it with your return. Enter your own tax bracket to see the amount you keep; state tax is not included.
Which tax rates does the calculator use for other countries?
Japan 20.315%, Germany 25% plus 5.5% solidarity surcharge above the saver's allowance, France 12.8% plus 18.6% social levies, Spain the savings scale from 19%, Brazil 22.5% down to 15% by days held. Sources are listed below.
What is the effective yearly rate?
It is the interest divided by the money you put in and by the years. For a lump sum at simple interest it equals the stated rate; for a monthly plan it is lower, which makes plans and deposits easy to compare.
More tools
