Income tax calculation in India has two parallel systems — the New Tax Regime (default) and the Old Tax Regime. Choosing the correct one and applying the right slabs, rebate, standard deduction and surcharge can change the final tax outflow by a significant amount.
This guide explains the complete structure for Financial Year 2025-26 (Assessment Year 2026-27) in clear language. Every major rule, slab and rebate has been cross-checked against publicly available information from the Income Tax Department and recent Finance Act updates. Tax laws can change; always verify the latest position on the official Income Tax portal or with a qualified tax professional before filing.
New Tax Regime vs Old Tax Regime – Quick Overview
The New Tax Regime is the default from Assessment Year 2024-25 onwards. You can still opt for the Old Tax Regime if it is more beneficial for you (especially if you have large deductions under 80C, 80D, HRA, home-loan interest etc.).
Key differences at a glance (FY 2025-26 / AY 2026-27):
| Feature |
New Tax Regime |
Old Tax Regime |
| Basic exemption |
₹4,00,000 (all ages) |
₹2,50,000 (below 60) / ₹3,00,000 (60-80) / ₹5,00,000 (80+) |
| Standard Deduction (Salary/Pension) |
₹75,000 |
₹50,000 |
| Section 87A Rebate |
Up to ₹60,000 (income up to ₹12 lakh) |
Up to ₹12,500 (income up to ₹5 lakh) |
| Major deductions (80C, 80D, HRA, etc.) |
Mostly not available |
Available |
| Highest surcharge |
25% |
37% |
Sources: Income Tax Department portal, Finance Act updates for FY 2025-26, and multiple independent analyses confirming the revised new-regime slabs and enhanced 87A rebate.
New Tax Regime Slabs – FY 2025-26 (AY 2026-27)
These slabs apply to individuals (resident or non-resident) under the default New Tax Regime. There is no separate higher exemption for senior citizens in the new regime.
| Taxable Income |
Tax Rate |
| Up to ₹4,00,000 |
Nil |
| ₹4,00,001 to ₹8,00,000 |
5% |
| ₹8,00,001 to ₹12,00,000 |
10% |
| ₹12,00,001 to ₹16,00,000 |
15% |
| ₹16,00,001 to ₹20,00,000 |
20% |
| ₹20,00,001 to ₹24,00,000 |
25% |
| Above ₹24,00,000 |
30% |
Health and Education Cess of 4% is applicable on the tax (plus surcharge, if any).
Section 87A Rebate under New Regime
Resident individuals whose taxable income does not exceed ₹12,00,000 can claim a rebate of up to ₹60,000 under Section 87A. This effectively makes the tax liability zero for eligible taxpayers up to that income level.
For salaried individuals and pensioners, after claiming the ₹75,000 standard deduction, gross salary up to approximately ₹12.75 lakh can result in nil tax (provided there is no other taxable income that pushes the total above ₹12 lakh).
Important: The rebate is available only to resident individuals. Marginal relief may apply for income slightly above ₹12 lakh. Always calculate exactly using the latest rules.
Old Tax Regime Slabs – FY 2025-26
The Old Tax Regime slabs remain largely unchanged and continue to offer higher basic exemption for senior and super-senior citizens.
Individuals below 60 years
| Taxable Income |
Tax Rate |
| Up to ₹2,50,000 |
Nil |
| ₹2,50,001 to ₹5,00,000 |
5% |
| ₹5,00,001 to ₹10,00,000 |
20% |
| Above ₹10,00,000 |
30% |
Senior Citizens (60 to 80 years)
| Taxable Income |
Tax Rate |
| Up to ₹3,00,000 |
Nil |
| ₹3,00,001 to ₹5,00,000 |
5% |
| ₹5,00,001 to ₹10,00,000 |
20% |
| Above ₹10,00,000 |
30% |
Super Senior Citizens (80 years and above)
| Taxable Income |
Tax Rate |
| Up to ₹5,00,000 |
Nil |
| ₹5,00,001 to ₹10,00,000 |
20% |
| Above ₹10,00,000 |
30% |
Under the Old Regime, resident individuals with taxable income up to ₹5 lakh can still claim rebate under Section 87A up to ₹12,500.
Standard Deduction
- New Tax Regime: ₹75,000 for salaried employees and pensioners
- Old Tax Regime: ₹50,000 for salaried employees and pensioners
This deduction is available against salary or pension income and does not require any investment or expense proof.
How to Calculate Income Tax – Step by Step
Whether you choose the New or Old regime, the basic calculation flow remains the same:
- Start with Gross Total Income (all heads of income).
- Claim the available deductions and exemptions under the chosen regime to arrive at Taxable Income.
- Apply the relevant slab rates to the Taxable Income.
- Add surcharge (if applicable).
- Add Health & Education Cess at 4%.
- Subtract rebate under Section 87A (if eligible).
- The final figure is your tax liability.
Using the Income Tax Calculator automates these steps and lets you compare both regimes side by side.
Surcharge Rates (FY 2025-26)
Surcharge is an additional tax on the income tax amount when total income crosses certain thresholds.
| Total Income |
Surcharge – New Regime |
Surcharge – Old Regime |
| Up to ₹50 lakh |
Nil |
Nil |
| ₹50 lakh – ₹1 crore |
10% |
10% |
| ₹1 crore – ₹2 crore |
15% |
15% |
| ₹2 crore – ₹5 crore |
25% |
25% |
| Above ₹5 crore |
25% |
37% |
Note: Marginal relief is available so that the additional tax due to surcharge does not exceed the income that crosses the threshold. Special rate incomes (such as certain capital gains) have restricted surcharge rates in some cases.
Health and Education Cess
A flat 4% Health and Education Cess is levied on the amount of income tax + surcharge. This applies under both regimes.
Worked Example – New Tax Regime
Illustration (Salaried Individual, FY 2025-26)
Gross Salary: ₹15,00,000
Standard Deduction: ₹75,000
Taxable Income: ₹14,25,000
Tax calculation under New Regime slabs:
- Up to ₹4,00,000 → Nil
- ₹4,00,001 to ₹8,00,000 → 5% of ₹4,00,000 = ₹20,000
- ₹8,00,001 to ₹12,00,000 → 10% of ₹4,00,000 = ₹40,000
- ₹12,00,001 to ₹14,25,000 → 15% of ₹2,25,000 = ₹33,750
Tax before cess = ₹93,750
Add 4% cess = ₹3,750
Total tax liability ≈ ₹97,500
No 87A rebate because taxable income exceeds ₹12 lakh.
These figures are for illustration only. Actual calculation depends on exact income heads, other deductions (if any), and the final rules applicable at the time of filing. Always verify with the
Income Tax Calculator or a tax professional.
Worked Example – Old Tax Regime
Illustration (Same person with deductions)
Gross Salary: ₹15,00,000
Standard Deduction: ₹50,000
Section 80C (EPF + PPF + ELSS etc.): ₹1,50,000
Section 80D (Health Insurance): ₹25,000
Taxable Income: ₹15,00,000 – ₹50,000 – ₹1,50,000 – ₹25,000 = ₹12,75,000
Tax under Old Regime (below 60 years):
- Up to ₹2,50,000 → Nil
- ₹2,50,001 to ₹5,00,000 → 5% = ₹12,500
- ₹5,00,001 to ₹10,00,000 → 20% of ₹5,00,000 = ₹1,00,000
- ₹10,00,001 to ₹12,75,000 → 30% of ₹2,75,000 = ₹82,500
Tax before cess = ₹1,95,000
Add 4% cess ≈ ₹7,800
Total tax liability ≈ ₹2,02,800
In this particular illustration the New Regime produces a lower tax. The result can reverse if the taxpayer has significantly higher deductions (large home-loan interest, HRA, more 80C/80D etc.).
Deductions Available under New Tax Regime
The New Regime allows only a limited set of deductions. The most commonly used ones are:
- Standard Deduction of ₹75,000 on salary/pension
- Employer’s contribution to NPS under Section 80CCD(2)
- Interest on home loan for let-out property under Section 24(b) (subject to conditions)
- Family pension deduction (lower of 1/3rd or ₹25,000)
- Agniveer Corpus Fund contribution (if applicable)
Most popular deductions such as 80C (PPF, ELSS, life insurance, principal repayment), 80D (health insurance for self), HRA exemption, and self-occupied home-loan interest are not available under the New Regime.
Deductions Available under Old Tax Regime
The Old Regime continues to allow the full range of exemptions and deductions, including:
- Standard Deduction ₹50,000
- Section 80C (up to ₹1.5 lakh) – EPF, PPF, ELSS, life insurance, tuition fees, home-loan principal, etc.
- Section 80CCD(1B) – additional NPS of ₹50,000
- Section 80D – health insurance premiums
- HRA exemption
- Leave Travel Allowance (LTA)
- Home-loan interest under Section 24(b) (up to ₹2 lakh for self-occupied property)
- Education loan interest under Section 80E
- Donations under Section 80G
- And several others
Taxpayers with substantial deductions often still find the Old Regime more beneficial.
Which Regime Should You Choose?
There is no universal answer. The correct choice depends on your actual numbers.
- If your total eligible deductions (80C + 80D + HRA + home-loan interest etc.) are low, the New Regime is usually better because of lower slab rates and higher rebate threshold.
- If you already have or plan large tax-saving investments and exemptions, calculate both ways. The Old Regime can still win.
- Salaried individuals with gross income up to roughly ₹12.75 lakh and minimal other income often pay zero tax under the New Regime after standard deduction and 87A rebate.
The safest method is to run both calculations every year with your actual figures using the Income Tax Calculator before deciding.
All slab rates, rebate limits and standard deduction amounts stated above are based on the position for FY 2025-26 (AY 2026-27) as reflected in publicly available updates from the Income Tax Department and Finance Act provisions. Rules can be amended; always cross-check the latest official notification or portal before filing your return.
Capital Gains and Special Rate Incomes
Not all income is taxed according to the regular slab rates. Certain incomes are taxed at special rates under both regimes:
- Short-term capital gains on equity-oriented mutual funds and listed equity shares (Section 111A) – currently 20% (plus cess) in many cases after recent changes; verify the exact rate applicable for the year.
- Long-term capital gains on equity-oriented funds and listed shares above the exemption limit (Section 112A).
- Long-term capital gains on other assets (debt funds, property, gold, etc.) – rates and indexation rules have undergone changes; always check the position for the specific financial year.
- Winnings from lotteries, puzzles, games etc. – taxed at a flat higher rate.
The Section 87A rebate generally does not set off tax on these special-rate incomes. When you use the Income Tax Calculator, enter special-rate incomes separately so that the rebate and slab calculation remain accurate.
TDS, Advance Tax and Self-Assessment Tax
Most salaried individuals have tax deducted at source (TDS) by the employer every month. The final tax liability is compared with the TDS already paid.
- If TDS is higher than the final liability → you get a refund.
- If TDS is lower → you need to pay the balance as self-assessment tax before filing the return.
Taxpayers with significant non-salary income (business, capital gains, rent, interest etc.) may also need to pay Advance Tax in instalments during the year if the estimated tax liability exceeds ₹10,000.
Missing advance-tax instalments can attract interest under Sections 234B and 234C. Planning the cash flow for these payments is an important part of tax management.
Choosing and Switching Between Regimes
The New Tax Regime is the default. If you want the Old Regime, you must actively opt for it while filing the return (or through the prescribed form in certain cases for business income).
- Salaried individuals without business income can choose the regime every year while filing the ITR.
- Taxpayers with business or professional income have more restricted switching rules. Once they opt out of the New Regime, returning to it later may be allowed only once in a lifetime (subject to the exact provisions applicable in that year).
Always decide the regime after calculating tax under both options with your actual numbers. Switching without calculation is one of the more common and costly mistakes.
Common Mistakes While Calculating Income Tax
- Forgetting to claim the correct standard deduction (₹75,000 vs ₹50,000).
- Assuming the 87A rebate is available above the prescribed income limit.
- Ignoring surcharge and cess in manual calculations.
- Claiming deductions under the New Regime that are not allowed.
- Not separating special-rate capital gains from regular income.
- Using previous year’s slabs or rebate limits instead of the current year’s rules.
- Failing to compare both regimes every year, especially after a salary hike or large new deduction.
Most of these errors are avoided by using an updated calculator and double-checking the final figures against Form 16 / Form 26AS / AIS.
Senior Citizens and Super Senior Citizens
Under the Old Tax Regime, senior citizens (60–80 years) get a higher basic exemption of ₹3 lakh and super senior citizens (80+) get ₹5 lakh. These higher exemptions are not available under the New Tax Regime — everyone has the same ₹4 lakh nil slab.
Senior citizens also enjoy some additional benefits such as higher interest income exemption under Section 80TTB (Old Regime) and generally higher health-insurance deduction limits under Section 80D.
Because the New Regime treats all ages the same, many senior citizens with moderate income and limited deductions still find the Old Regime advantageous. Running both calculations remains essential.
How to Use the Income Tax Calculator Effectively
A good income tax calculator should allow you to:
- Select the financial year / assessment year
- Choose New or Old Regime (or compare both)
- Enter salary, house property, capital gains, other sources separately
- Claim the correct standard deduction and other eligible deductions
- See the final tax, surcharge, cess and rebate clearly
The
Harshonomics Income Tax Calculator is designed for exactly this purpose. Use it at least twice — once under each regime — before finalising your tax-saving decisions or filing the return.
Best practice: Update the calculator inputs whenever your salary changes, you make a large investment, or you receive significant capital gains during the year. Waiting until the end of the year reduces your ability to take corrective action.
Linking Tax Planning with Other Financial Goals
Tax-saving investments under the Old Regime (ELSS, PPF, EPF, NPS, life insurance etc.) also serve long-term goals such as retirement and children’s education. The decision is never only about saving tax this year.
Useful related resources on Harshonomics:
Choosing a regime only because it gives a slightly lower tax bill this year, while damaging your long-term investment plan, is usually a poor trade-off.
Which ITR Form Should You Use?
The correct ITR form depends on your sources of income and residential status. A simplified overview for most individuals:
- ITR-1 (Sahaj) – For resident individuals with salary/pension, one house property, and other sources (interest etc.), total income up to ₹50 lakh, and no capital gains (with some exceptions).
- ITR-2 – For individuals and HUFs with capital gains, more than one house property, foreign income/assets, or income exceeding the ITR-1 limits.
- ITR-3 – For individuals and HUFs having income from business or profession.
- ITR-4 (Sugam) – For presumptive income under Sections 44AD, 44ADA, 44AE (subject to conditions).
Always confirm the latest eligibility criteria on the Income Tax e-filing portal, as the forms and conditions are updated periodically.
Practical Tax Planning Checklist (FY 2025-26)
- I have calculated tax under both New and Old regimes with my actual numbers.
- I have claimed the correct standard deduction (₹75,000 or ₹50,000).
- I have checked eligibility for Section 87A rebate.
- I have separated special-rate capital gains from regular income.
- I have verified Form 16, Form 26AS and AIS for accuracy.
- I have planned advance tax instalments if my liability (after TDS) is significant.
- I have decided the regime only after comparison, not by habit.
- I have considered the long-term impact of tax-saving investments on my overall financial goals.
Frequently Asked Questions
Which tax regime is better for me?
There is no single answer. Run the numbers under both regimes using the Income Tax Calculator. People with low deductions usually benefit from the New Regime. People with high 80C, 80D, HRA and home-loan interest may still prefer the Old Regime.
Is income up to ₹12 lakh completely tax-free under the New Regime?
For resident individuals, taxable income up to ₹12 lakh can result in zero tax because of the enhanced Section 87A rebate (up to ₹60,000). After the ₹75,000 standard deduction, many salaried people with gross income up to about ₹12.75 lakh pay nil tax, provided there is no other taxable income.
Can senior citizens get higher exemption under the New Regime?
No. The New Regime has the same ₹4 lakh nil slab for all ages. Higher basic exemption limits for senior and super-senior citizens are available only under the Old Regime.
Can I switch regimes every year?
Salaried individuals without business income can generally choose every year while filing the return. Taxpayers with business or professional income face more restrictions on switching back to the New Regime after opting out.
Does the 87A rebate apply to capital gains?
The rebate under Section 87A is generally available against tax on regular slab-rate income. It does not set off tax on special-rate incomes such as certain capital gains. Always calculate separately.
What is the standard deduction for FY 2025-26?
₹75,000 under the New Tax Regime and ₹50,000 under the Old Tax Regime for salaried employees and pensioners.
How is surcharge calculated?
Surcharge is levied on the income-tax amount when total income crosses ₹50 lakh, ₹1 crore, ₹2 crore or ₹5 crore. The rates differ slightly at the highest slab between the two regimes. Marginal relief is available.
Do I need to pay advance tax?
If your estimated tax liability for the year (after TDS) exceeds ₹10,000, you are generally required to pay advance tax in instalments. Interest is charged for shortfall or delay.
Where can I verify the latest official slabs?
Always cross-check on the official Income Tax Department website (incometax.gov.in) and the latest Finance Act notifications. This guide is based on the position for FY 2025-26 (AY 2026-27) as available in public sources at the time of writing.
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Final Notes
Tax rules are precise and change over time. The slabs, rebate limits, standard deduction and surcharge rates mentioned in this guide reflect the position for Financial Year 2025-26 (Assessment Year 2026-27) based on publicly available information from the Income Tax Department and related updates.
Before filing your return or making large tax-related decisions, verify the latest provisions on the official portal or consult a qualified tax professional. Using an updated calculator and comparing both regimes every year remains the most reliable way to avoid overpaying tax.
Disclaimer
This guide is for educational purposes only and does not constitute professional tax, legal or financial advice. All figures, slabs, rebates and examples are based on the understanding of rules applicable for FY 2025-26 (AY 2026-27) as available in public sources at the time of writing. Tax laws, circulars and interpretations can change. Readers must verify the current official position on the Income Tax Department website or with a qualified Chartered Accountant / tax adviser before taking any action. Harshonomics.com and its authors accept no liability for any loss or decision arising from the use of this material.