Income tax calculator guide
What is an Income Tax Calculator?
An Income Tax Calculator estimates how much tax you may have to pay on your income for a financial year. You enter your salary or business income, other income such as interest or rent, and the deductions or exemptions you claim. The calculator applies the applicable slab rates, adds surcharge and cess where relevant, and shows your estimated tax liability, effective tax rate and take-home income.
Most modern calculators also compare the old regime and the new regime side by side, so you can see which one leaves you with more money in hand before you pick an option in your ITR.
The output is an estimate. Your actual liability depends on the income heads you have, the proofs you can produce, your residential status and the provisions of the Income-tax Act that apply to you. File on the income tax portal or with a professional before you treat any number as final.
What this calculator shows you
- Gross total income — the sum of your income from salary, house property, business or profession, capital gains and other sources.
- Taxable income — gross total income minus the deductions and exemptions allowed under the regime you choose.
- Slab-wise tax — how much of your income falls in each bracket and what each bracket contributes.
- Rebate under Section 87A — the rebate that can reduce tax to nil for incomes below the notified limit.
- Surcharge and health & education cess — the extra layers charged on higher incomes.
- Total tax payable — the final estimate for the year.
- Effective tax rate — total tax as a percentage of gross income. This is usually far lower than your slab rate.
- Old vs new regime comparison — the difference in tax and take-home under each option.
Tip: Do not compare regimes using slab rates alone. The new regime usually has lower rates but removes most deductions, while the old regime has higher rates but allows Section 80C, 80D, HRA and home-loan interest. The comparison only makes sense after you enter your real deduction numbers.
How to use the income tax calculator
- Select the financial year you are calculating for. Slabs and rebate limits change between years.
- Enter your gross salary, or your business or professional income.
- Add other income — bank interest, dividend, rental income, capital gains, freelance income.
- Claim the standard deduction if you are salaried and it is allowed under the regime you are testing.
- Enter deductions such as 80C, 80D, 80CCD(1B), 80TTA, HRA exemption and home-loan interest, if you are comparing with the old regime.
- Enter any TDS already deducted by your employer or payer, and any advance tax you have paid.
- Read the tax payable, the effective rate and the regime comparison.
- Change one input at a time — for example, increase your 80C investment or add an 80D premium — and watch the tax move.
Old regime vs new regime: the basic difference
Point
Old regime
New regime
Slab rates
Higher, with the top rate starting earlier
Lower, with wider lower brackets
Deductions
80C, 80D, 80CCD(1B), 80TTA, 80G and more
Mostly not available
HRA exemption
Available
Not available
Home loan interest on self-occupied property
Available up to the notified limit
Generally not available for self-occupied property
Standard deduction for salaried
Available up to ₹50,000
Available up to ₹75,000
Best suited for
People with large deductions and home loans
People with few deductions and simple income
Exact rates, limits and rebate thresholds change with each Finance Act. Always confirm the figures for your financial year on the income tax portal before filing.
Income tax slabs (new regime, FY 2026-27)
Taxable income
Rate
Up to ₹4,00,000 Nil ₹4,00,001 – ₹8,00,000 5% ₹8,00,001 – ₹12,00,000 10% ₹12,00,001 – ₹16,00,000 15% ₹16,00,001 – ₹20,00,000 20% ₹20,00,001 – ₹24,00,000 25% Above ₹24,00,000 30%
Under the new regime, a rebate under Section 87A can bring the tax to nil for taxable income up to ₹12,00,000, with a maximum rebate of ₹60,000. Because the salaried standard deduction of ₹75,000 is applied first, a salaried person can receive up to ₹12,75,000 in gross salary and still pay no tax. Verify the exact rebate amount and income cut-off for your financial year.
Income tax slabs (old regime)
Taxable income
Rate
Up to ₹2,50,000 Nil ₹2,50,001 – ₹5,00,000 5% ₹5,00,001 – ₹10,00,000 20% Above ₹10,00,000 30%
Under the old regime, resident senior citizens get a higher basic exemption limit — ₹3,00,000 for those aged 60 to 80, and ₹5,00,000 for those above 80. The Section 87A rebate under the old regime is up to ₹12,500 for taxable income up to ₹5,00,000. The salaried standard deduction is ₹50,000. Check the current figures for your age and financial year.
Surcharge and cess
On top of the slab tax, a surcharge applies when total income crosses the notified high-income thresholds — commonly ₹50 lakh, ₹1 crore, ₹2 crore and ₹5 crore. The surcharge rate rises with the income band. Under the new regime the maximum surcharge is 25%; under the old regime it can go up to 37% for income above ₹5 crore. Marginal relief may apply near the surcharge thresholds so that the tax does not jump disproportionately.
A health and education cess of 4% is added on the total of tax plus surcharge. The calculator should handle this; if you are doing it by hand, do not skip it.
Deductions that usually matter (old regime)
Section
What it covers
Who benefits most
80C
EPF, PPF, ELSS, life insurance premium, principal on home loan, children's tuition fees and similar (limit ₹1,50,000)
Salaried and self-employed with active investments
80CCD(1B)
Extra contribution to the National Pension System (up to ₹50,000)
Anyone with spare cash for retirement
80D
Health insurance premium for self, family and parents (up to ₹25,000 for self/family, up to ₹50,000 for senior-citizen parents)
Families, especially with senior-citizen parents
80TTA / 80TTB
Interest on savings accounts (up to ₹10,000); higher limit of ₹50,000 for senior citizens
People with idle cash in savings accounts
24(b)
Interest on a home loan for a self-occupied property (up to ₹2,00,000 under the old regime)
Home-loan borrowers
HRA
House rent allowance exemption for those living in rented accommodation
Salaried renters
80G
Donations to eligible funds and institutions
Donors with receipts
Deduction caps, eligibility conditions and the documents required for each section are set by law. Enter only what you can actually prove. An inflated deduction in the calculator gives a comfortable number that will not survive scrutiny.
Illustrative examples
Sample maths only, to show how the structure works. Your figures will differ.
Gross salary
Deductions claimed
Approx. taxable income (old)
Approx. taxable income (new)
₹8,00,000
₹1,50,000 under 80C
≈ ₹6,00,000
≈ ₹7,25,000
₹12,00,000
₹1,50,000 under 80C + ₹25,000 under 80D
≈ ₹9,75,000
≈ ₹11,25,000
₹18,00,000
₹1,50,000 under 80C + ₹50,000 NPS + home loan interest
≈ ₹14,50,000
≈ ₹17,25,000
At lower incomes the new regime often wins because of the wider exemption and the rebate. At higher incomes with large deductions, the old regime can still be competitive. The only reliable answer is to run both with your own numbers.
How to read the result
- Taxable income — not your salary. It is what remains after exemptions and deductions.
- Total tax payable — slab tax plus surcharge plus cess, minus rebate. This is the estimate for the full year.
- Effective tax rate — total tax divided by gross income. Use this to sanity-check whether a raise or a new investment is worth it.
- Marginal rate — the rate on your next rupee of income. Useful when you are deciding whether to take on extra freelance work.
- TDS and advance tax — amounts already paid. The balance is what you settle at filing, or what you get back as a refund.
- Regime comparison — the gap between the two totals. If the gap is small, look at non-tax factors such as flexibility and paperwork before deciding.
TDS, advance tax and Form 16
If you are salaried, your employer deducts TDS on estimated income and pays it to the government. Form 16, issued after the year ends, summarises the salary paid and the tax deducted. Enter that TDS figure in the calculator to see whether you are likely to owe more or receive a refund.
If you have income that is not covered by TDS — freelance work, rental income, capital gains, large interest income — advance tax may be payable in instalments during the year. Missing an instalment can attract interest under the relevant sections. The calculator estimates the total; it does not schedule the instalments for you.
Capital gains: a separate track
Income from selling shares, mutual funds, property or gold is taxed under capital gains, not under the normal slabs. Short-term and long-term gains have different rates, and holding periods differ by asset class. Equity-oriented investments have their own rate structure, and indexation rules have changed in recent years.
A general income tax calculator may only approximate this. If capital gains form a large part of your income, calculate them separately and add the result, or use a dedicated tool and confirm with the current rules.
Common mistakes to avoid
- Comparing regimes on slab rates alone. Total tax, not the top rate, is what matters.
- Forgetting cess and surcharge. Together they can add a meaningful amount at higher incomes.
- Entering the wrong financial year. Slabs and rebate limits change. Check the year selector before you read the result.
- Claiming deductions you cannot prove. Rent receipts, insurance premium proofs and investment statements are required.
- Ignoring exempt income. Some income is exempt but still needs to be reported in the return.
- Mixing up TDS with total tax. TDS is a payment on account, not the final liability.
- Assuming the estimate is the filing figure. It is a planning number. Reconcile it against Form 26AS and the Annual Information Statement before you file.
Frequently asked questions
Which regime should I choose?
The one with the lower total tax for your actual numbers. The new regime is the default in many filing flows, but you can opt for the old regime if you qualify and it is beneficial. Salaried taxpayers without business income can generally switch between regimes each year; those with business income face restrictions on how often they can switch back. Confirm the current rules.
Does this calculator include the standard deduction?
It should, if you are salaried and the regime you are testing allows it. The standard deduction is up to ₹50,000 under the old regime and up to ₹75,000 under the new regime. Check whether the calculator applies it automatically or expects you to enter it.
Is HRA exemption available in the new regime?
No. House rent allowance exemption is generally available only under the old regime. If you pay significant rent and have a good HRA component, test the old regime before deciding.
Can I claim both HRA and home loan interest?
In specific situations, yes — for example when you live in a rented home in one city and own a property in another. The conditions matter. Read the provisions or ask a professional before claiming both.
Why is my effective tax rate lower than my slab rate?
Because slabs are progressive. Only the income above each threshold is taxed at the higher rate. Your first few lakhs are taxed at nil or low rates, which pulls the average down.
Does it cover income from freelancing or a small business?
You can enter business or professional income, but the treatment depends on whether you file under the normal provisions or a presumptive scheme. Presumptive taxation has its own rules and limits. Check which one applies to you.
Are capital gains included?
Partly, at best. Capital gains are taxed separately with their own rates and holding-period rules. For anything significant, calculate them separately and verify with the current provisions.
Is this the same as my tax return?
No. This is an estimate for planning. The return is filed on the income tax portal with your actual figures, and the liability is computed there. Reconcile against Form 26AS and the Annual Information Statement first.
Do senior citizens get any benefit?
Under the old regime, resident senior citizens have a higher basic exemption limit (₹3,00,000 for 60–80 years and ₹5,00,000 for above 80), and there are specific provisions for interest income and health insurance. Check the current limits for your age band.
Related calculators
Income Tax Calculator
Salary Calculator
Home Loan Calculator
EMI Calculator
Loan Calculator
SIP Calculator
PPF Calculator
Inflation Calculator
Retirement Planning Calculator
Related guides
Personal Finance Calculator Guide
Wealth Creation Strategy in India
KCC Loan 2026: Limit, Rate and Rules
Checklist before you file
- Both regimes compared with your real deduction numbers
- Correct financial year selected
- Form 16 and salary slips reconciled
- Form 26AS and Annual Information Statement checked for missing income
- Bank interest, dividend and rental income included
- Capital gains calculated separately where applicable
- Deduction proofs collected and stored
- TDS and advance tax credited correctly
- Return filed before the due date to avoid late fees and interest
Disclaimer: This income tax calculator and the content on this page are for education and mathematical estimation only. They are not tax advice, a tax return, or a substitute for professional consultation. Slab rates, rebate limits, surcharge thresholds, deduction caps and capital gains rules change with each Finance Act. Results depend entirely on the inputs you enter and on the provisions that apply to your residential status and income heads. Verify everything against the current Income-tax Act and the official income tax portal, or consult a qualified chartered accountant, before you file or make a financial decision. Harshonomics is not a lender, a tax authority, or a SEBI-registered Investment Adviser.
```
Income tax calculator guide
What is an Income Tax Calculator?
An Income Tax Calculator estimates how much tax you may have to pay on your income for a financial year. You enter your salary or business income, other income such as interest or rent, and the deductions or exemptions you claim. The calculator applies the applicable slab rates, adds surcharge and cess where relevant, and shows your estimated tax liability, effective tax rate and take-home income.
Most modern calculators also compare the old regime and the new regime side by side, so you can see which one leaves you with more money in hand before you pick an option in your ITR.
The output is an estimate. Your actual liability depends on the income heads you have, the proofs you can produce, your residential status and the provisions of the Income-tax Act that apply to you. File on the income tax portal or with a professional before you treat any number as final.
What this calculator shows you
- Gross total income — the sum of your income from salary, house property, business or profession, capital gains and other sources.
- Taxable income — gross total income minus the deductions and exemptions allowed under the regime you choose.
- Slab-wise tax — how much of your income falls in each bracket and what each bracket contributes.
- Rebate under Section 87A — the rebate that can reduce tax to nil for incomes below the notified limit.
- Surcharge and health & education cess — the extra layers charged on higher incomes.
- Total tax payable — the final estimate for the year.
- Effective tax rate — total tax as a percentage of gross income. This is usually far lower than your slab rate.
- Old vs new regime comparison — the difference in tax and take-home under each option.
Tip: Do not compare regimes using slab rates alone. The new regime usually has lower rates but removes most deductions, while the old regime has higher rates but allows Section 80C, 80D, HRA and home-loan interest. The comparison only makes sense after you enter your real deduction numbers.
How to use the income tax calculator
- Select the financial year you are calculating for. Slabs and rebate limits change between years.
- Enter your gross salary, or your business or professional income.
- Add other income — bank interest, dividend, rental income, capital gains, freelance income.
- Claim the standard deduction if you are salaried and it is allowed under the regime you are testing.
- Enter deductions such as 80C, 80D, 80CCD(1B), 80TTA, HRA exemption and home-loan interest, if you are comparing with the old regime.
- Enter any TDS already deducted by your employer or payer, and any advance tax you have paid.
- Read the tax payable, the effective rate and the regime comparison.
- Change one input at a time — for example, increase your 80C investment or add an 80D premium — and watch the tax move.
Old regime vs new regime: the basic difference
| Point | Old regime | New regime |
|---|---|---|
| Slab rates | Higher, with the top rate starting earlier | Lower, with wider lower brackets |
| Deductions | 80C, 80D, 80CCD(1B), 80TTA, 80G and more | Mostly not available |
| HRA exemption | Available | Not available |
| Home loan interest on self-occupied property | Available up to the notified limit | Generally not available for self-occupied property |
| Standard deduction for salaried | Available up to ₹50,000 | Available up to ₹75,000 |
| Best suited for | People with large deductions and home loans | People with few deductions and simple income |
Exact rates, limits and rebate thresholds change with each Finance Act. Always confirm the figures for your financial year on the income tax portal before filing.
Income tax slabs (new regime, FY 2026-27)
| Taxable income | Rate |
|---|---|
| Up to ₹4,00,000 | Nil |
| ₹4,00,001 – ₹8,00,000 | 5% |
| ₹8,00,001 – ₹12,00,000 | 10% |
| ₹12,00,001 – ₹16,00,000 | 15% |
| ₹16,00,001 – ₹20,00,000 | 20% |
| ₹20,00,001 – ₹24,00,000 | 25% |
| Above ₹24,00,000 | 30% |
Under the new regime, a rebate under Section 87A can bring the tax to nil for taxable income up to ₹12,00,000, with a maximum rebate of ₹60,000. Because the salaried standard deduction of ₹75,000 is applied first, a salaried person can receive up to ₹12,75,000 in gross salary and still pay no tax. Verify the exact rebate amount and income cut-off for your financial year.
Income tax slabs (old regime)
| Taxable income | Rate |
|---|---|
| Up to ₹2,50,000 | Nil |
| ₹2,50,001 – ₹5,00,000 | 5% |
| ₹5,00,001 – ₹10,00,000 | 20% |
| Above ₹10,00,000 | 30% |
Under the old regime, resident senior citizens get a higher basic exemption limit — ₹3,00,000 for those aged 60 to 80, and ₹5,00,000 for those above 80. The Section 87A rebate under the old regime is up to ₹12,500 for taxable income up to ₹5,00,000. The salaried standard deduction is ₹50,000. Check the current figures for your age and financial year.
Surcharge and cess
On top of the slab tax, a surcharge applies when total income crosses the notified high-income thresholds — commonly ₹50 lakh, ₹1 crore, ₹2 crore and ₹5 crore. The surcharge rate rises with the income band. Under the new regime the maximum surcharge is 25%; under the old regime it can go up to 37% for income above ₹5 crore. Marginal relief may apply near the surcharge thresholds so that the tax does not jump disproportionately.
A health and education cess of 4% is added on the total of tax plus surcharge. The calculator should handle this; if you are doing it by hand, do not skip it.
Deductions that usually matter (old regime)
| Section | What it covers | Who benefits most |
|---|---|---|
| 80C | EPF, PPF, ELSS, life insurance premium, principal on home loan, children's tuition fees and similar (limit ₹1,50,000) | Salaried and self-employed with active investments |
| 80CCD(1B) | Extra contribution to the National Pension System (up to ₹50,000) | Anyone with spare cash for retirement |
| 80D | Health insurance premium for self, family and parents (up to ₹25,000 for self/family, up to ₹50,000 for senior-citizen parents) | Families, especially with senior-citizen parents |
| 80TTA / 80TTB | Interest on savings accounts (up to ₹10,000); higher limit of ₹50,000 for senior citizens | People with idle cash in savings accounts |
| 24(b) | Interest on a home loan for a self-occupied property (up to ₹2,00,000 under the old regime) | Home-loan borrowers |
| HRA | House rent allowance exemption for those living in rented accommodation | Salaried renters |
| 80G | Donations to eligible funds and institutions | Donors with receipts |
Deduction caps, eligibility conditions and the documents required for each section are set by law. Enter only what you can actually prove. An inflated deduction in the calculator gives a comfortable number that will not survive scrutiny.
Illustrative examples
Sample maths only, to show how the structure works. Your figures will differ.
| Gross salary | Deductions claimed | Approx. taxable income (old) | Approx. taxable income (new) |
|---|---|---|---|
| ₹8,00,000 | ₹1,50,000 under 80C | ≈ ₹6,00,000 | ≈ ₹7,25,000 |
| ₹12,00,000 | ₹1,50,000 under 80C + ₹25,000 under 80D | ≈ ₹9,75,000 | ≈ ₹11,25,000 |
| ₹18,00,000 | ₹1,50,000 under 80C + ₹50,000 NPS + home loan interest | ≈ ₹14,50,000 | ≈ ₹17,25,000 |
At lower incomes the new regime often wins because of the wider exemption and the rebate. At higher incomes with large deductions, the old regime can still be competitive. The only reliable answer is to run both with your own numbers.
How to read the result
- Taxable income — not your salary. It is what remains after exemptions and deductions.
- Total tax payable — slab tax plus surcharge plus cess, minus rebate. This is the estimate for the full year.
- Effective tax rate — total tax divided by gross income. Use this to sanity-check whether a raise or a new investment is worth it.
- Marginal rate — the rate on your next rupee of income. Useful when you are deciding whether to take on extra freelance work.
- TDS and advance tax — amounts already paid. The balance is what you settle at filing, or what you get back as a refund.
- Regime comparison — the gap between the two totals. If the gap is small, look at non-tax factors such as flexibility and paperwork before deciding.
TDS, advance tax and Form 16
If you are salaried, your employer deducts TDS on estimated income and pays it to the government. Form 16, issued after the year ends, summarises the salary paid and the tax deducted. Enter that TDS figure in the calculator to see whether you are likely to owe more or receive a refund.
If you have income that is not covered by TDS — freelance work, rental income, capital gains, large interest income — advance tax may be payable in instalments during the year. Missing an instalment can attract interest under the relevant sections. The calculator estimates the total; it does not schedule the instalments for you.
Capital gains: a separate track
Income from selling shares, mutual funds, property or gold is taxed under capital gains, not under the normal slabs. Short-term and long-term gains have different rates, and holding periods differ by asset class. Equity-oriented investments have their own rate structure, and indexation rules have changed in recent years.
A general income tax calculator may only approximate this. If capital gains form a large part of your income, calculate them separately and add the result, or use a dedicated tool and confirm with the current rules.
Common mistakes to avoid
- Comparing regimes on slab rates alone. Total tax, not the top rate, is what matters.
- Forgetting cess and surcharge. Together they can add a meaningful amount at higher incomes.
- Entering the wrong financial year. Slabs and rebate limits change. Check the year selector before you read the result.
- Claiming deductions you cannot prove. Rent receipts, insurance premium proofs and investment statements are required.
- Ignoring exempt income. Some income is exempt but still needs to be reported in the return.
- Mixing up TDS with total tax. TDS is a payment on account, not the final liability.
- Assuming the estimate is the filing figure. It is a planning number. Reconcile it against Form 26AS and the Annual Information Statement before you file.
Frequently asked questions
Which regime should I choose?
The one with the lower total tax for your actual numbers. The new regime is the default in many filing flows, but you can opt for the old regime if you qualify and it is beneficial. Salaried taxpayers without business income can generally switch between regimes each year; those with business income face restrictions on how often they can switch back. Confirm the current rules.
Does this calculator include the standard deduction?
It should, if you are salaried and the regime you are testing allows it. The standard deduction is up to ₹50,000 under the old regime and up to ₹75,000 under the new regime. Check whether the calculator applies it automatically or expects you to enter it.
Is HRA exemption available in the new regime?
No. House rent allowance exemption is generally available only under the old regime. If you pay significant rent and have a good HRA component, test the old regime before deciding.
Can I claim both HRA and home loan interest?
In specific situations, yes — for example when you live in a rented home in one city and own a property in another. The conditions matter. Read the provisions or ask a professional before claiming both.
Why is my effective tax rate lower than my slab rate?
Because slabs are progressive. Only the income above each threshold is taxed at the higher rate. Your first few lakhs are taxed at nil or low rates, which pulls the average down.
Does it cover income from freelancing or a small business?
You can enter business or professional income, but the treatment depends on whether you file under the normal provisions or a presumptive scheme. Presumptive taxation has its own rules and limits. Check which one applies to you.
Are capital gains included?
Partly, at best. Capital gains are taxed separately with their own rates and holding-period rules. For anything significant, calculate them separately and verify with the current provisions.
Is this the same as my tax return?
No. This is an estimate for planning. The return is filed on the income tax portal with your actual figures, and the liability is computed there. Reconcile against Form 26AS and the Annual Information Statement first.
Do senior citizens get any benefit?
Under the old regime, resident senior citizens have a higher basic exemption limit (₹3,00,000 for 60–80 years and ₹5,00,000 for above 80), and there are specific provisions for interest income and health insurance. Check the current limits for your age band.
Related calculators
Related guides
Checklist before you file
- Both regimes compared with your real deduction numbers
- Correct financial year selected
- Form 16 and salary slips reconciled
- Form 26AS and Annual Information Statement checked for missing income
- Bank interest, dividend and rental income included
- Capital gains calculated separately where applicable
- Deduction proofs collected and stored
- TDS and advance tax credited correctly
- Return filed before the due date to avoid late fees and interest
Disclaimer: This income tax calculator and the content on this page are for education and mathematical estimation only. They are not tax advice, a tax return, or a substitute for professional consultation. Slab rates, rebate limits, surcharge thresholds, deduction caps and capital gains rules change with each Finance Act. Results depend entirely on the inputs you enter and on the provisions that apply to your residential status and income heads. Verify everything against the current Income-tax Act and the official income tax portal, or consult a qualified chartered accountant, before you file or make a financial decision. Harshonomics is not a lender, a tax authority, or a SEBI-registered Investment Adviser.