What is a fixed deposit calculator?

A fixed deposit calculator estimates the maturity value and interest earned on a one-time term deposit using the amount, interest rate, tenure, and compounding assumptions entered by the user.

What is the difference between cumulative and payout mode?

Cumulative mode reinvests interest and shows a maturity amount at the end of the tenure. Payout mode treats interest as paid out instead of reinvested, so the principal remains separate while cash payouts accumulate over time.

Can this calculator be used for term deposits or CDs?

Yes. Different markets call similar fixed-term deposit products fixed deposits, term deposits, time deposits, or certificates of deposit. This calculator uses generic assumptions rather than one bank's product rules.

Does this calculator include tax, withholding, or early withdrawal penalties?

It can apply optional user-entered tax and withholding assumptions, but it does not hardcode country tax law, insurance, penalty, or promotional-rate rules. Early withdrawal penalties are not included.

Why does compounding frequency matter?

More frequent reinvestment can increase the maturity value in cumulative mode because interest earns interest more often. The calculator compares yearly, half-yearly, quarterly, monthly, and daily compounding side by side.

§ Tools / Series 03 · Personal finance

Fixed deposit calculator

A deterministic, stateless calculator that turns a single term deposit into its full output picture: maturity value, gross interest, after-tax maturity, effective annual yield, and side-by-side comparison of how different compounding frequencies change the same deposit. Product-neutral: works as a Fixed Deposit, Term Deposit, or Certificate of Deposit — no country-specific tax law is hardcoded.

§ Transparency layer

Every output has a formula-trace line. Every input is audited as used / defaulted / unused. Nominal vs effective rate is a first-class toggle, not buried. Cumulative vs payout are explicitly separate modes — you cannot accidentally compare apples-to-oranges.

Presets

Compounding frequencies

Interest modes

5×

Rate scenarios

Methodology

§ Start with a preset

Three product-neutral presets · adjust any field after.

Inputs

Everything you change reruns the math instantly. No save, no login.

Currency

Display unit

01Deposit

Deposit amount

Tenure

yrs

02Rate

Interest rate (P.A.)

Effective annual: 5.095%

Compounding frequency

03Interest mode

How interest is handled

Interest payout frequency

Locked to at-maturity for cumulative mode.

04AdvancedRate Nominal APR · tax 0% · withholding 0%

Maturity value · gross

$11,607.55

Single deposit of $10,000.00 grows over 3 years at 5% quarterly compounding.

Gross interest$1,607.55

Effective annual yield5.095%

Principal

$10,000

10,000 × ones

Periodic rate

1.2500%

per quarterly · 4×/yr

Compounding periods

3 years × 4

Total cash received

$11,608

paid at maturity

§ Compounding comparison

How much does compounding frequency actually move the maturity number?

Same principal · same nominal rate · same tenure. The spread between yearly and daily is what you'd give up by choosing the wrong frequency.

Compounding	Periods / yr	Periodic rate	Effective annual	Maturity	Interest	vs yearly
Yearly	1	5.0000%	5.000%	$11,576.25	$1,576.25	—
Half-yearly	2	2.5000%	5.062%	$11,596.93	$1,596.93	+$20.68
Quarterly selected	4	1.2500%	5.095%	$11,607.55	$1,607.55	+$31.30
Monthly	12	0.4167%	5.116%	$11,614.72	$1,614.72	+$38.47
Daily	365	0.0137%	5.127%	$11,618.22	$1,618.22	+$41.97

§ Rate scenarios

What if the bank's quote moves by 25 bps before you lock in?

-50 bps

4.50%

$11,437

interest $1,437

-25 bps

4.75%

$11,522

interest $1,522

Base

5.00%

$11,608

interest $1,608

+25 bps

5.25%

$11,694

interest $1,694

+50 bps

5.50%

$11,781

interest $1,781

§ Yearly schedule

How the balance compounds year-by-year

Year	Opening balance	Interest credited	Closing balance
Y1	$10,000.00	+$509.45	$10,509.45
Y2	$10,509.45	+$535.41	$11,044.86
Y3	$11,044.86	+$562.68	$11,607.55

§ Formula trace

every output, derived

principal = 10000 × Ones = 10000.00 USD
periodsPerYear = 4 (quarterly)
periodicRate = 1.250000% (from 5% nominal apr)
periods = round(3 × 4) = 12
effectiveAnnualYield = (1 + periodicRate)^4 − 1 = 5.094534%
maturityAmountGross = principal × (1 + periodicRate)^periods = 11607.55
grossInterestEarned = maturity − principal = 1607.55

§ Input audit

no input silently ignored

amountused

annualRatePctused

compoundingused

currencyused

interestModeused

payoutFreqdefaulted

rateConventionused

taxRatePctdefaulted

tenureYearsused

unitused

withholdingRatePctdefaulted

§ Warnings

No tax or withholding modeled — FD/CD interest is generally taxable as ordinary income; the after-tax maturity will be lower than shown.
Early-withdrawal penalties and deposit-insurance caps are not modeled. Country-specific tax (TDS thresholds, slabs, exemptions) is whatever rate you type — no jurisdictional rules are hardcoded.

§ Golden references · locked in tests

Principal $1,000 · 12% · 10 years — the same deposit at four compounding frequencies. The spread is the whole reason the comparison table exists.

Yearly

$3,105.85

Quarterly

$3,262.04

Monthly

$3,300.39

Daily

$3,319.46

§ Related calculators

Recurring deposit calculator →Compound interest calculator →FD vs stock market returns →SIP calculator →

§ Same engine, headlessly

Rate normalization, compounding comparison, rate scenarios, yearly schedule, formula trace, and input audit are all reachable through public stateless REST. MCP candidates exist behind an unpassed launch gate and are not publicly available. Unknown inputs are rejected with a 422; ignored-in-context inputs are flagged in the audit — no input is silently consumed.

POST/api/v1/financial-calculators/fixed-deposit/calculate

POST/api/v1/financial-calculators/fixed-deposit/run

GET/api/v1/financial-calculators/fixed-deposit/schema

GET/api/v1/financial-calculators/fixed-deposit/defaults

MCP preview · not launchedcalculate_fixed_deposit_returns

methodology_version = financial-calculators.v1 · canonical = /en/tools/fixed-deposit-calculator

§ What v1 does not include

No workbook save/load — v1 is intentionally stateless.
No early-withdrawal penalty modeling.
No country-specific tax law (TDS thresholds, slab rules, exemptions) — tax is whatever rate you type.
No leap-year handling in daily compounding (uses 365 days flat; surfaced in warnings).
No premium prefill — there is no ticker data for FDs.

§ FAQ

Four things worth knowing

Q01Is this a Fixed Deposit, Term Deposit, or Certificate of Deposit calculator?+

It is all three. The math is identical — a single deposit, a fixed rate, a fixed compounding frequency, and a maturity date. The page is intentionally product-neutral: no country-specific tax law, TDS thresholds, deposit-insurance limits, or promotional-rate restrictions are hardcoded. Use it with the terminology of whichever market you are in.

Q02Why does the effective annual yield differ from the rate I typed?+

Banks usually quote the nominal APR (the rate compounded n times per year). A 12% nominal rate compounded daily produces an effective annual yield of about 12.747%. Toggle Rate convention → Effective annual to treat your input as the already-compounded yield instead. The Compounding comparison table makes the gap visible across yearly / half-yearly / quarterly / monthly / daily.

Q03Cumulative vs payout — what is the difference?+

Cumulative reinvests every period of interest until maturity (compound growth). Payout returns the principal at maturity and pays simple interest periodically (a CD-style income stream). The two are not interchangeable — payout deposits do not benefit from compounding, which is why cumulative deposits at the same nominal rate end up with a higher total cash received. We model the two as separate modes precisely so the gap is visible.

Q04How is tax computed?+

Tax and withholding are both applied to the gross interest earned. The tool does not model any country-specific tax law (no TDS thresholds, no slab logic, no exemptions) — it is whatever rate you type. After-tax maturity = principal + gross interest × (1 − tax rate). Withholding is reported separately so you can model a TDS-style withholding without conflating it with your final tax bill.

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