Is APY the same as the interest rate?

APY includes the effect of compounding over a year. A stated interest rate may be lower than APY when interest compounds during the year.

Does the calculator include taxes?

It can apply a simple estimated tax rate to interest earned, but it is not tax advice and does not file or classify income.

Can a savings APY change?

Yes. Savings-account rates are often variable. Check the bank's account disclosures for current APY, fees, and conditions.

Savings Calculator

Estimate how a savings balance can grow with APY, monthly deposits, interest posting frequency, and an optional tax-rate scenario.

Initial balance ($)

APY (%)

Time to grow (months)

Interest posting

Monthly deposit ($)

Tax treatment

APY and fees can change for savings accounts. This estimate does not replace bank disclosures, account terms, early withdrawal rules, or tax advice.

What this savings calculator estimates

English savings-calculator intent is about estimating how a bank savings balance can grow over time. The calculator uses an initial balance, APY, time period, monthly deposits, and interest posting frequency to estimate the ending balance and interest earned.

Initial savings balance.
Annual percentage yield, or APY.
Monthly deposit amount.
Time to grow in months.
Ending balance, total deposits, interest earned, and optional estimated tax.

Estimate only

Savings account APYs can change, fees may reduce earnings, and tax treatment depends on the account and taxpayer. Use bank disclosures for official terms.

APY and recurring-deposit model

r_{p} = (1 + A P Y)^{1/ m} - 1

The tool converts APY into a periodic rate for the selected interest-posting frequency.

B_{i} = B_{i - 1} (1 + r_{p}) + D_{i}

Each period applies interest to the current balance, then adds the allocated recurring deposit.

I n t er es t = E n d in g ba l an ce - T o t a l d e p os i t s

Estimated tax, when entered, is applied only to the interest earned.

APY, fees and deposit insurance

Item	Why it matters
APY	A standardized annual yield that reflects compounding for deposit accounts.
Fees	Monthly maintenance or transaction fees can reduce the real amount earned.
FDIC or NCUA coverage	Eligible bank or credit union accounts are insured up to applicable limits.
Variable rates	Savings-account APYs can change after account opening.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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