GST Calculator — add or remove GST

Add GST to a base price, or pull the GST out of an amount that already includes it. The result shows the base amount, the tax, and the CGST + SGST split for an intra-state sale.

Loan amount

Interest rate (p.a.)

Tenure

Extra monthly prepayment (optional)

Monthly EMI

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PrincipalInterest

Principal

Total interest

Total payable

Amortization schedule (year-wise)

Year	Principal	Interest	Balance

Monthly investment

Expected return (p.a.)

Time period

Annual step-up

Projected value

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InvestedReturns

Invested amount

Est. returns

Step-up raises your monthly amount each year — a powerful way to grow wealth as income rises.

One-time investment

Expected return (p.a.)

Time period

Future value

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Invested

Est. returns

How much to invest monthly to reach a target corpus.

Target amount

Expected return (p.a.)

Years to goal

Monthly SIP needed

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One-time lumpsum alternative

Total you'll invest (SIP)

Deposit amount

Interest rate (p.a.)

Tenure (years)

Compounding

Maturity value

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Principal

Interest earned

Recurring deposit — a fixed amount every month, compounded quarterly.

Monthly deposit

Interest rate (p.a.)

Tenure (months)

Maturity value

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Total deposited

Interest earned

Public Provident Fund — yearly deposit, compounded annually (15-year lock-in).

Yearly deposit

Interest rate (p.a.)

Duration (years)

Maturity value

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Total deposited

Interest earned (tax-free)

Amount (₹)

GST rate

Amount type

Total amount

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Base amount

GST (18%)

CGST + SGST

Compare the New and Old regimes side by side (FY 2025-26). Enter deductions for the Old regime.

Annual gross income

Old-regime deductions (80C, HRA, etc.)

New regime

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Old regime

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You save by choosing the better one

New Regime: nil up to ₹12,00,000 taxable (§87A), incl. 4% cess. Old Regime: ₹2.5L exempt, then 5/20/30% slabs on (income − deductions), incl. cess. Indicative estimate — not tax advice.

Bill / price (₹)

Mode

Percentage

You pay

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Discount

Systematic Withdrawal Plan — how long your corpus lasts while you draw a fixed amount each month.

Corpus invested

Monthly withdrawal

Expected return (p.a.)

Period

Balance after period

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Total withdrawn

Corpus status

Sukanya Samriddhi Yojana — deposit yearly for 15 years; matures in 21 years. Interest compounded annually, fully tax-free (EEE).

Yearly deposit (max ₹1.5L)

Interest rate (p.a.)

Maturity value (21 years)

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Total deposited (15 yrs)

Interest earned (tax-free)

National Pension System — corpus at 60, then min 40% buys an annuity (pension).

Monthly contribution

Expected return (p.a.)

Your age

Annuity return (p.a.)

Corpus at 60

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Lumpsum at 60 (60%, tax-free)

Annuity corpus (40%)

Est. monthly pension

Gratuity under the Payment of Gratuity Act = last salary (Basic + DA) × 15 ÷ 26 × years of service.

Last monthly salary (Basic + DA)

Years of service

Gratuity payable

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Tax-exempt limit₹20,00,000

Eligible after 5 years of continuous service. Amount above ₹20 lakh is taxable.

Estimate your monthly in-hand from annual CTC (New tax regime, standard assumptions).

Annual CTC

Estimated monthly in-hand

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Annual in-hand

Employee PF

Income tax (New regime)

Professional tax

Indicative only. Assumes Basic = 50% of CTC, employer + employee PF at 12% of Basic, gratuity provision, ₹75,000 standard deduction, ₹2,500/yr professional tax. Your actual structure varies.

How big a loan you may qualify for, from your income and existing EMIs (FOIR method).

Net monthly income

Existing monthly EMIs

Interest rate (p.a.)

Tenure

FOIR (income share for EMIs)

Eligible loan amount

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Max affordable EMI

Mode

Principal

Rate (p.a.)

Time

Total amount

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Interest

Absolute return

What today's money will cost — and be worth — in the future.

Amount today

Inflation rate (p.a.)

Years

Future cost of the same basket

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Today's amount will then be worth

How the GST Calculator works

Add GST: Total = Base × (1 + g ÷ 100) · Remove GST: Base = Total × 100 ÷ (100 + g)

g — GST rate in % (5, 12, 18 or 28)

Within one state the tax is split equally into CGST and SGST; for an inter-state sale the same total is charged as IGST.

Worked example

At 18% GST:

₹10,000 + GST	₹11,800 (GST ₹1,800)
CGST + SGST	₹900 + ₹900
₹11,800 including GST	base ₹10,000, GST ₹1,800

Adding and removing GST are exact inverses: 18% added to ₹10,000 gives ₹11,800, and removing it from ₹11,800 gives ₹10,000 back.

Load these numbers into the calculator →

Frequently asked questions

Why is removing 18% GST not the same as taking 18% off?

Because the GST was charged on the base, not on the total. 18% of ₹11,800 is ₹2,124, but the GST inside ₹11,800 is only ₹1,800. Divide by 1.18 instead.

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PaisaCalc results are arithmetic estimates from the inputs you enter and the formulas shown. They are not financial, investment or tax advice; rates, rules and your own situation vary, so check with your bank, fund house or a qualified adviser before deciding.