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High-Yield Savings Interest Calculator

Estimate how much your savings will actually grow using effective-APY compounding, real deposit timing, and your own tax rate.

Quick answer: A high-yield savings account earns simple daily interest that compounds into APY. Enter your balance, APY, and months saved to estimate interest earned and the gap versus a low-rate bank account.

SWReviewed by SwitchWize Research Desk · Last reviewed July 15, 2026
Ending Balance
$13,500
Ending Balance
$13,500
Total Deposits
$13,000
Interest Earned
$500
After-Tax Interest
$380
HYSA growth mix
$13,500total
Your deposits$13,000
Interest earned$500
Total$13,500
Average Monthly Interest
$42
Diagnostic

At your APY, your HYSA grows to about $13,500 over 12 months.

That includes $500 of interest before tax and $380 after tax.

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At 4.40% APY, $10,000 plus $250/mo could grow to $13,500 over 12 months.

What to do next

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Your action plan
  1. 1

    Calculate the baseline result with your current numbers

    Estimate savings growth using effective-APY compounding, end-of-month deposits, and an entered tax-rate scenario.

  2. 2

    Compare the result against current market-rate options

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Confirm with a qualified professional or the provider before acting.

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What the Bank Gap Index Measures, and What It CostsA definitional report on the SwitchWize Bank Gap Index: what it measures, how it is calculated, why the gap between the national-average and top-available savings rate persists, and what it costs a real household.
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Top savings picks

Reviewed Nov 7, 2026 · Methodology

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PiBank
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Frequently Asked Questions

Everything you need to know.

Is savings account interest taxed?
Yes, interest earned in a regular high-yield savings account is taxed as ordinary income in the year it's earned, which is why this calculator lets you enter your marginal tax rate to see the after-tax growth, not just the gross number.
Why does deposit timing matter for the interest calculation?
Money deposited later in the month earns less interest that month than money already in the account, so assuming all contributions land on day one overstates growth. This calculator models end-of-month deposit timing instead for a more realistic estimate.
What is effective APY compounding?
It's the actual annualized return after accounting for how often interest compounds, daily or monthly are common, which can be slightly higher than the stated rate compounded just once a year. This calculator uses that effective rate rather than a simplified annual estimate.
Is the High-Yield Savings Interest Calculator free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the High-Yield Savings Interest Calculator affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to compare high-yield savings rates, or run Money Map to compare this banking & savings decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (savings) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

A simple "balance times APY" estimate overstates or understates real growth depending on when deposits actually land and how compounding is applied. Using effective-APY compounding with end-of-month deposit timing, and netting out your entered tax rate, gives a more accurate picture of what a high-yield savings account will actually earn than a back-of-envelope calculation.

How to Use It

  1. 1Enter your starting balance, APY, and how much you plan to deposit each month
  2. 2Set your time horizon and marginal tax rate
  3. 3Review the projected balance and total interest earned, before and after tax
  4. 4Compare the result against a CD or other savings option to see which fits your timeline
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