Fixed Deposit Calculator

Total Value By Maturity

$ {{ formatMoney(analysis.totalAfterTaxValue) }}

Principal:

Enter dollars only, e.g. 10000 for a $10,000 fixed deposit.

Rate basis:

Choose the wording printed on the bank offer: APR or APY.

Quoted rate:

Use percent form, e.g. 4.25 for a 4.25% fixed-deposit quote.

% / yr

Term length:

Use whole years plus 0-11 extra months; 1 year 6 months means 18 months.

years months

Interest crediting:

Match the deposit contract: monthly, quarterly, semi-annual, or annual.

Interest handling:

Use reinvest for compounding, or payout when interest is paid to another account.

Check the inputs:

Deposit start date:

Select the deposit opening date; the date input stores YYYY-MM-DD.

Tax rate:

Enter 0-100 as a percent of interest, not of principal.

Tax timing:

Use each credit for withholding; use maturity for end-of-term tax deduction.

Inflation rate:

Enter expected annual inflation as a percent, or 0 to skip real-value adjustment.

% / yr

Coverage limit:

Enter an insured or policy cap in dollars; 0 turns off the coverage lens.

Category	Field	Value	Detail	Copy
{{ row.category }}	{{ row.label }}	{{ row.display }}	{{ row.note }}

Period	Credit window	Days	Opening ($)	Gross ($)	Tax ($)	Paid out ($)	Ending ($)	Copy
{{ row.periodNumber }}	{{ row.windowLabel }}	{{ row.days }}	{{ formatMoney(row.openingBalance) }}	{{ formatMoney(row.grossInterest) }}	{{ formatMoney(row.taxApplied) }}	{{ formatMoney(row.paidOut) }}	{{ formatMoney(row.endingBalance) }}

Year	Gross ($)	Tax ($)	Paid out ($)	Ending ($)	Total value ($)	Copy
Year {{ row.yearIndex }}	{{ formatMoney(row.grossInterest) }}	{{ formatMoney(row.taxApplied) }}	{{ formatMoney(row.paidOut) }}	{{ formatMoney(row.endingBalance) }}	{{ formatMoney(row.totalAfterTaxValue) }}

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A fixed deposit is a time-based savings arrangement: money is placed with a bank or similar institution for a stated term, and the rate is normally known before the term begins. In the United States the close equivalent is a certificate of deposit, or CD. The appeal is predictability, but the planning question is broader than the advertised rate. The final value depends on how interest is quoted, when interest is credited, whether credits stay on deposit, and how taxes, inflation, and coverage limits affect the amount that is actually useful at maturity.

The headline rate is easy to overread. A nominal annual percentage rate (APR) tells you the yearly rate before compounding. Annual percentage yield (APY) is already an annualized yield and reflects compounding assumptions. A deposit paying 4.25% APR with monthly crediting is not the same as a deposit advertising 4.25% APY, and a payout deposit is not the same as a reinvested deposit even when the same rate appears on the offer sheet.

Fixed deposit planning factors
Factor	Why it changes the answer
Rate quote	APR needs compounding context; APY is already annualized.
Crediting dates	Monthly, quarterly, semi-annual, and annual credits create different compounding paths and schedule rows.
Interest handling	Reinvested credits can earn more interest; paid-out credits become separate cash.
Tax and inflation	Taxes reduce interest, while inflation can turn a positive nominal gain into a smaller real gain.
Protection limit	Coverage depends on the highest balance and the real account ownership rules, not just the starting deposit.

Fixed deposit flow from principal and rate quote through crediting dates to after-tax and real value.

Timing also matters because deposit contracts are written against dates, not just neat fractions of a year. A one-year term can contain 365 or 366 days, monthly periods can have different day counts, and a 17-month term with quarterly crediting ends with a shorter final credit. These details usually move cents on small deposits, but they can matter when comparing close offers or large balances.

A maturity value is still only a modeled result. Early-withdrawal penalties, renewal choices, promotional step rates, bank fees, jurisdiction-specific tax rules, and deposit-insurance ownership categories can change the real decision. The calculation is most useful as a consistent comparison frame, not as a substitute for the bank disclosure or professional advice.

How to Use This Tool:

Enter the contract terms first, then add tax, inflation, and coverage assumptions only when those details affect the decision.

Enter Principal, choose Rate basis, and fill Quoted rate. Pick APR for a nominal annual quote and APY when the offer already states annual percentage yield.
Set Term length and Interest crediting. The FD Readiness tab then shows Maturity date, Calendar days, and Crediting periods.
Choose Interest handling. Reinvest each credit leaves net credits in the deposit. Pay out each credit separates those credits into Paid-out cash.
Open Advanced for planning assumptions. Deposit start date controls the actual calendar schedule, Tax rate and Tax timing control after-tax interest, Inflation rate produces real-value fields, and Coverage limit checks the highest on-deposit balance.
If the warning area says Enter a principal greater than 0. or Choose a term longer than 0 months., fix that input before using the tables or charts.
Use Credit Schedule for period-level interest, Yearly Rollup for longer terms, Outcome Mix for principal versus interest and tax, Balance Curve for the value path, and Rate Reality for APR/APY, after-tax yield, and real yield comparison.

Interpreting Results:

Start with Total after-tax value, After-tax annual yield, and Real annual yield. These fields say more than the quoted rate because they include the selected tax timing, interest handling, and inflation assumption. If interest is paid out during the term, read Paid-out cash together with Maturity settlement; the settlement alone can look low because the interest has already left the deposit.

Equivalent APY appears for APR quotes, while Implied nominal rate appears for APY quotes. Use the converted field when comparing offers with different rate wording.
Real value at maturity discounts the modeled final value by the entered inflation rate. A positive Net interest can still pair with a weak or negative Real annual yield.
Calendar vs equal-month delta shows how much the actual date schedule changed the total after-tax value compared with equalized month lengths.
Amount above limit is based on Peak on-deposit balance. It does not decide whether a bank, ownership type, beneficiary setup, or linked account arrangement is insured.
Use the schedule when a result looks surprising. It shows the opening balance, days, gross interest, tax, paid-out cash, and ending balance for every credit window.

Technical Details:

Fixed deposit math is a period schedule. Each credit window starts with an opening balance, runs for a specific number of calendar days, earns gross interest, applies any selected tax deduction, and either retains the net interest or pays it out. The final maturity value is the balance or combined cash outcome after the last period and any maturity-end tax reserve.

APR and APY feed the period rate differently. A nominal APR is prorated over the actual days in the credit window using a 365-day year. An APY quote is treated as an annual growth factor, so the period rate is the APY growth over the same day fraction. Separately, the converted headline fields use the selected crediting frequency to show either equivalent APY or implied nominal APR.

Formula Core:

The core formulas below show the governing rate conversion, period interest, annualized yield, and inflation adjustment. The schedule rounds money values to cents at each credit, while rate fields are displayed to four decimal places in the main result table.

\begin{array}{lll} r_{APR period} & = & APR \frac{d}{365} \\ r_{APY period} & = & {(1 + APY)}^{\frac{d}{365}} - 1 \\ I_{gross} & = & B_{open} r_{period} \\ Y_{annual} & = & {(\frac{V_{end}}{V_{start}})}^{\frac{365}{d_{total}}} - 1 \\ V_{real} & = & \frac{V_{after-tax}}{{(1 + i)}^{\frac{d_{total}}{365}}} \end{array}

Fixed deposit symbols and result fields
Symbol	Meaning	Related output
`Bopen`	Opening balance for one crediting period	`Opening ($)` in `Credit Schedule`
`d`	Actual calendar days in a crediting period	`Days`
`dtotal`	Total calendar days from start date to maturity	`Calendar days`
`Vend`	Ending value used for annualized yield	`Total after-tax value` or `Real value at maturity`
`i`	Annual inflation assumption used for discounting	`Inflation rate`

Tax timing changes cash movement, not the gross interest formula. With tax on each credit, every period deducts tax before reinvestment or payout. With tax at maturity, the schedule tracks a reserve and deducts the full modeled tax at the end. Payout mode records each net credit as cash received during the term, while reinvest mode keeps credits inside the deposit and lets later periods earn on a larger balance.

Fixed deposit input bounds and effects
Input	Accepted range or choices	Effect on the model
`Principal`	0 or more, but results require a value greater than 0	Sets starting value and the base for interest and coverage checks.
`Quoted rate`	0% to 1000%	Feeds the APR proration path or APY growth-factor path.
`Term length`	0 to 100 years plus 0 to 11 months, with a positive total term required	Sets maturity date, total days, credit count, and possible stub period.
`Interest crediting`	Monthly, quarterly, semi-annual, or annual	Controls schedule windows and compounding opportunities.
`Tax rate`	0% to 100%	Applies only to modeled interest, not to principal.
`Coverage limit`	0 or more; 0 turns off the comparison	Compares the limit with peak on-deposit balance.

For a one-year $10,000 deposit starting January 1, 2026 at 4.25% APR with monthly crediting and reinvested interest, the schedule contains 12 periods over 365 days. With tax and inflation set to zero, the modeled gross interest is $433.37, the Total after-tax value is $10,433.37, and the Equivalent APY is 4.3338%. Differences from another calculator usually come from rate-basis choice, day-count convention, per-credit rounding, or whether paid-out interest is treated as available cash.

Limitations and Privacy Notes:

This is an educational planning model for a single fixed-rate deposit held to maturity. It is not financial, tax, legal, or banking advice.

Early-withdrawal penalties, renewal rates, promotional steps, fees, required minimums, and tiered rates are outside the calculation.
The tax fields apply a simple percentage to interest. They do not determine actual withholding, filing status, deductions, or tax liability.
The coverage check is a generic limit comparison. It does not calculate FDIC, CDIC, FSCS, PIDM, or other jurisdiction-specific insurance rules.
Inflation is entered as one annual assumption for the whole term. Real purchasing power can differ when inflation changes during the deposit period.
After the page loads, the deposit math runs in the browser. The form values do not need to be sent to a server to produce the schedule, charts, or downloads.

Worked Examples:

Monthly reinvestment from a nominal quote

Set Deposit start date to January 1, 2026. Enter Principal $10,000, choose APR, use Quoted rate 4.25%, set a one-year term, monthly Interest crediting, and Reinvest each credit. With tax and inflation at zero, Total after-tax value is about $10,433.37, Equivalent APY is about 4.3338%, and After-tax annual yield is about 4.3337%.

Paid-out interest with tax and inflation

For a $20,000 deposit starting January 1, 2026 at 5.00% APY over two years, choose monthly crediting and Pay out each credit. Add a 24% Tax rate on each credit and a 2% Inflation rate. The modeled Paid-out cash is about $1,486.24, Maturity settlement stays at $20,000.00, Total after-tax value is about $21,486.24, and Real annual yield is about 1.6167%.

Stub period with a coverage check

Use a January 1, 2026 start date, $15,000 principal, 4.60% APR, one year and five months, quarterly crediting, reinvested credits, 15% tax at maturity, 2.5% inflation, and a Coverage limit of $15,500. The Credit Schedule ends with a 61-day final row because 17 months does not divide into full quarters. Peak on-deposit balance is about $16,002.18, so Amount above limit is about $502.18.

Near a $250,000 protection threshold

Set $249,000 principal, 4.90% APY, a six-month term from January 1, 2026, monthly crediting, reinvested interest, and a $250,000 Coverage limit. The modeled Peak on-deposit balance reaches about $254,977.41, so Amount above limit is about $4,977.41. That is only a mathematical exposure flag; actual insurance depends on account ownership and institution rules.

Validation before reading results

A $0 Principal hides the analysis and shows Enter a principal greater than 0.. A zero-year, zero-month term shows Choose a term longer than 0 months.. Clear those warnings before relying on the schedule, charts, JSON, or exported tables.

FAQ:

Is APR the same as APY?

No. APR is treated as a nominal annual rate before compounding. APY is treated as an annualized yield that already reflects compounding. That is why the results show Equivalent APY for APR input and Implied nominal rate for APY input.

Why is maturity settlement close to principal in payout mode?

Payout mode records each credit as Paid-out cash instead of adding it back to the deposit. Read Paid-out cash, Maturity settlement, and Total after-tax value together.

Why does the final credit period sometimes have fewer days?

The selected term may not line up with the selected crediting interval. When that happens, the last Credit Schedule row uses the remaining calendar days to maturity instead of forcing a full month, quarter, half-year, or year.

Does the coverage limit calculate FDIC insurance?

No. The limit field compares your entered amount with Peak on-deposit balance. For U.S. FDIC-insured banks, the standard amount is generally $250,000 per depositor, per insured bank, per ownership category, but the ownership rules are outside this calculator.

Do the tax fields calculate my tax return?

No. Tax rate is a simple percentage applied to modeled interest, and Tax timing only decides whether that deduction is taken each credit or at maturity. Use actual tax forms and local rules for filing decisions.

Why did the result disappear?

The result panels are hidden when required inputs fail validation. Enter a positive Principal and a term longer than zero months, and the schedule, charts, JSON, and exports return.

Glossary:

APR: Nominal annual percentage rate before compounding effects are included.
APY: Annual percentage yield, an annualized return that reflects compounding assumptions.
Crediting period: One interest window between an opening balance and the next posted credit.
Maturity settlement: The amount still in the deposit at maturity after any maturity-end tax deduction.
Paid-out cash: Interest distributed during the term instead of retained in the deposit.
Real value at maturity: The modeled final value after discounting by the entered inflation rate.
Stub period: A shorter final credit window created when the term does not match the crediting interval.

References:

Appendix A to Part 1030 - Annual Percentage Yield Calculation, Consumer Financial Protection Bureau.
Deposit Insurance at a Glance, Federal Deposit Insurance Corporation.
Publication 550 (2025), Investment Income and Expenses, Internal Revenue Service, 2025.