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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11There is no regime that is cheapest for every taxpayer. For Assessment Year (AY) 2026-27, the new tax regime is the default for eligible taxpayers, but you can opt for the old regime if you meet the applicable conditions. The correct choice is the one that produces the lower final tax after applying the correct slabs, eligible deductions and exemptions, section 87A rebate, surcharge and 4% health and education cess to your own income mix.
Compare both regimes using the same tax year and the same complete figures for salary, house property, capital gains, business or professional income, other sources, age and residential status. A headline slab comparison is not enough, particularly if you have deductions, special-rate income, business income or income near a surcharge threshold.
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What “old tax regime vs new tax regime” really means
The two regimes are alternative methods of calculating an individual’s income tax. They use different slab structures and treat deductions and exemptions differently. Your result is not determined by the marginal rate on your last rupee alone: the calculation runs through the applicable slabs, then considers rebate, surcharge and cess.
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The comparison should therefore answer two separate questions:
- Which regime gives the lower final tax for this taxpayer and this year?
- Can the taxpayer make that election in the intended way, and can it be changed later?
Fix the tax year and election rules before calculating
Use AY 2026-27 consistently
The slab, rebate, cess and surcharge figures in this guide apply to AY 2026-27 under the Income Tax Act, 1961. Do not combine them with figures from another assessment year or with a calculator set to a different law.
The Income Tax Department’s estimator manual is prepared for Tax Year 2026-27 under the Income Tax Act, 2025. For an AY 2026-27 comparison under the rules described here, the manual says to select the Income Tax Act, 1961 in the estimator. This distinction matters because a year label and the law selected in a tool are not interchangeable.
Know who can change the default regime
| Taxpayer situation | How the choice is made | Switching constraint |
|---|---|---|
| No business or professional income | The taxpayer can choose the old regime directly in the income-tax return filed by the applicable section 139(1) due date. | The option to change can generally be exercised each year in the return, subject to the statutory conditions and due date. |
| Business or professional income | Opting out of the default new regime requires the Form 10-IEA procedure. | Returning to the default regime is restricted. For eligible taxpayers, after opting out, the option can be exercised only once in a lifetime, so the decision requires particular care. |
The table describes the election rules in the Income Tax Department’s AY 2026-27 guidance. If you have business or professional income, confirm the Form 10-IEA requirement and your switching eligibility before filing rather than treating the choice as an annual toggle.
AY 2026-27 slab rates side by side
Old-regime slabs for an individual below age 60
These are the published old-regime bands for an individual below age 60. They apply to taxable income, not automatically to gross salary or gross receipts.
| Taxable-income band | Rate |
|---|---|
| Up to ₹2.5 lakh | Nil |
| ₹2.5 lakh to ₹5 lakh | 5% |
| ₹5 lakh to ₹10 lakh | 20% |
| Above ₹10 lakh | 30% |
Age-based old-regime basic exemption for resident seniors
The old regime changes the nil threshold for resident senior citizens. A resident individual aged 60 to under 80 has a nil threshold of ₹3 lakh, while a resident individual aged 80 or above has a nil threshold of ₹5 lakh. The age-based basic exemption described here is specifically relevant to resident seniors; do not apply it automatically to every non-resident or to every taxpayer category.
| Resident individual’s age | Old-regime nil threshold | Remaining published bands |
|---|---|---|
| Below 60 | ₹2.5 lakh | 5% from ₹2.5 lakh–₹5 lakh; 20% from ₹5 lakh–₹10 lakh; 30% above ₹10 lakh |
| 60 to under 80 | ₹3 lakh | The applicable old-regime senior-citizen bands |
| 80 or above | ₹5 lakh | The applicable old-regime super-senior-citizen bands |
The official page presents the slabs for individuals who are resident or non-resident, but the higher old-regime nil thresholds are stated for resident senior citizens. Record age and residential status before using the table.
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New-regime slabs
The AY 2026-27 new-regime slab structure published for the age groups shown is:
| Taxable-income band | Rate |
|---|---|
| Up to ₹4 lakh | Nil |
| ₹4 lakh to ₹8 lakh | 5% |
| ₹8 lakh to ₹12 lakh | 10% |
| ₹12 lakh to ₹16 lakh | 15% |
| ₹16 lakh to ₹20 lakh | 20% |
| ₹20 lakh to ₹24 lakh | 25% |
| Above ₹24 lakh | 30% |
The new-regime table uses the same published structure for the age groups shown. Age can still affect the overall comparison because the old regime has special resident-senior thresholds and because your deductions, income types and rebate eligibility may differ.
Rebate, cess and surcharge can change the result
Section 87A rebate
For resident individuals, the AY 2026-27 guidance states:
| Regime | Taxable-income condition | Maximum stated rebate |
|---|---|---|
| New regime | Taxable income does not exceed ₹12 lakh | Up to ₹60,000 |
| Old regime | Taxable income does not exceed ₹5 lakh | Up to ₹12,500 |
The rebate is subject to statutory conditions. These limits are stated for resident individuals; do not assume that a non-resident qualifies or that every kind of income receives the same treatment. Apply the rebate only after establishing the correct taxable income and regime.
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Health and education cess
Under both regimes, health and education cess is 4% of income tax plus surcharge, if any. It is added after the underlying tax and applicable surcharge are calculated, so comparing only the pre-cess slab tax can give the wrong final answer.
Surcharge and marginal relief
For AY 2026-27, the official table lists these surcharge rates under both regimes:
| Total income band | Old regime | New regime |
|---|---|---|
| ₹50 lakh to ₹1 crore | 10% | 10% |
| ₹1 crore to ₹2 crore | 15% | 15% |
| ₹2 crore to ₹5 crore | 25% | 25% |
| Above ₹5 crore | 37% | 25% |
The published table notes exceptions for specified classes of income and also describes marginal relief. If your income is close to a surcharge threshold, or includes income taxed at a special rate, use the full calculation rather than applying the table as a simple percentage to all income.
Deductions, exemptions and income mix: the items that make a comparison personal
Use regime-specific deductions only
Start with the same gross income information for both calculations, then apply only the deductions and exemptions available under the regime being calculated. Do not subtract every deduction in both columns merely because it appears on a salary statement or investment record.
The department’s estimator includes deduction and tax-payment inputs such as PPF, LIC, housing loan, NPS, mediclaim and higher-education loan. Their eligibility, limits and treatment vary by the applicable rules and by the taxpayer’s facts. Enter an item only after confirming that it is available in that regime and that you satisfy its conditions.
Include every income category
The official estimator asks for income under:
- Salary
- House property
- Capital gains
- Business or profession
- Other sources
Capital gains and other special-rate income cannot safely be estimated by applying the ordinary slab rate to the entire amount. Keep those amounts identified separately and check the effect of the special rate, rebate restrictions and surcharge rules in the final computation.
Age and residential status are calculation inputs
Enter age and residential status before comparing the regimes. Residential status affects the relevance of the senior-citizen basic-exemption thresholds and the stated resident-individual rebate. It can also affect how particular income is treated. A calculator result based on the wrong status is not a reliable regime comparison.
How to compare your tax liability step by step
- Set the year and law. Choose AY 2026-27 and, for this comparison, the Income Tax Act, 1961. Keep the same selection for both regimes.
- Identify the taxpayer category. Record whether the taxpayer is an individual, age below 60, a resident senior citizen, or another category shown by the estimator. Record residential status separately.
- Determine the election path. Check whether the taxpayer has business or professional income. This decides whether the old-regime choice can be made directly in the return or requires Form 10-IEA and carries switching restrictions.
- Gather the complete income set. Enter salary, house property, capital gains, business or professional income and other sources. Use the same figures in both calculations.
- Separate ordinary and special-rate income. Do not blend capital gains or another special-rate amount into ordinary slab income without checking its specific treatment.
- Apply permitted adjustments for the old regime. Enter only deductions and exemptions available under the old regime and supported by the taxpayer’s facts.
- Apply permitted adjustments for the new regime. Rebuild the calculation rather than copying the old-regime deductions. The new-regime column must contain only items allowed there.
- Calculate slab tax. Apply each band progressively. A band’s rate applies to the income falling within that band, not to the entire taxable income.
- Apply section 87A where eligible. Check the resident-individual condition, the taxable-income threshold and all statutory conditions before reducing the tax.
- Add surcharge and 4% cess. Check the surcharge bands, special-income exceptions and marginal relief before adding cess.
- Compare final totals. Compare the tax payable after all applicable adjustments, not the headline slab tax. Record the assumptions used for each column.
- Verify filing and due-date requirements. Confirm that the intended regime election is valid for the taxpayer’s income type and is made by the applicable section 139(1) due date.
Using the Income Tax Department’s estimator
The official estimator is useful because it forces the comparison to include more than salary. It asks for taxpayer category, residential status, age, return timing, the five principal income categories, deduction information and tax-payment details, then provides an estimate under both regimes.
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Recommended input sequence
- Select the relevant tax law and year. For an AY 2026-27 calculation using the rules in this guide, select the Income Tax Act, 1961.
- Enter age, residential status and the taxpayer category requested by the tool.
- Enter each income head separately, including any capital gain or business/professional amount.
- Enter eligible deductions and tax-payment details, checking each item against the regime-specific rules.
- Review the output for rebate, surcharge and cess, rather than reading only the first tax figure displayed.
- Save the assumptions and compare the two regime results before filing the return.
The estimator is an aid, not a substitute for checking special-rate income, marginal relief, business-income election rules or unusual facts. A taxpayer with business income, complex capital gains or a high-income surcharge issue may need a qualified Indian tax professional to review the result.
Worked illustration: why taxable income and rebate matter
Consider a resident individual below age 60 with taxable income of ₹12 lakh, no special-rate income, no surcharge and no regime-specific deduction to add. This is an illustration of the published AY 2026-27 bands, not a personalized assessment.
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| Step | Old regime | New regime |
|---|---|---|
| Tax before rebate | ₹12,500 on ₹2.5–₹5 lakh; ₹1,00,000 on ₹5–₹10 lakh; ₹60,000 above ₹10 lakh: ₹1,72,500 | ₹20,000 on ₹4–₹8 lakh; ₹40,000 on ₹8–₹12 lakh: ₹60,000 |
| Section 87A rebate | Not available because taxable income exceeds ₹5 lakh | Up to ₹60,000 because taxable income does not exceed ₹12 lakh, subject to statutory conditions |
| Tax after rebate | ₹1,72,500 | ₹0 |
| 4% cess | ₹6,900 | ₹0 |
| Illustrative total | ₹1,79,400 | ₹0 |
A different deduction pattern, age, residential status, income mix or statutory condition can change the result. The important lesson is that the rebate threshold is applied to taxable income after the relevant calculation, and that cess must be included in the comparison.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which taxpayers need the closest analysis?
Taxable income near a rebate threshold
A small change in taxable income around ₹5 lakh under the old regime or ₹12 lakh under the new regime can affect rebate eligibility. Recalculate after every permitted deduction or adjustment rather than assuming that a gross-income figure determines the threshold.
Resident senior citizens
The old regime’s ₹3 lakh and ₹5 lakh nil thresholds for resident senior citizens can materially alter the first part of the comparison. Enter the correct age and residential status; do not use the below-60 table by default.
Taxpayers with substantial deductions or exemptions
If the taxpayer has items such as PPF, LIC, a housing loan, NPS, mediclaim or a higher-education loan, verify each item’s eligibility and regime treatment. The old regime may produce a different taxable-income base, but the answer must come from the complete calculation rather than from the existence of an investment alone.
Capital-gains and other special-rate income
Special-rate income can make an ordinary slab-only comparison misleading. Keep it identified, apply the relevant treatment and check whether rebate, surcharge or marginal relief is affected.
Business and professional taxpayers
For these taxpayers, the election procedure is part of the decision. Form 10-IEA and the restriction on returning to the default regime mean that a slightly lower estimate in one year should not be treated as an automatic reason to opt out without considering future flexibility.
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At or above ₹50 lakh, surcharge enters the calculation. Above ₹5 crore, the published table shows different maximum surcharge rates for the old and new regimes. Exceptions for specified income classes and marginal relief can change the result near a threshold, so use a full computation.
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Common comparison errors and how to correct them
Mixing assessment years
Error: using a slab from another year with AY 2026-27 income. Fix: set the year and law first, then use the same settings for both columns.
Comparing gross salary instead of taxable income
Error: applying the rebate threshold or slab directly to gross salary. Fix: calculate taxable income separately under each regime after only the deductions and exemptions allowed there.
Copying old-regime deductions into the new-regime column
Error: treating every investment, insurance payment or loan item as deductible in both regimes. Fix: verify each item’s eligibility and enter it only in the applicable calculation.
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Error: using the below-60 old-regime threshold for a resident senior, or assuming the resident rebate applies to a non-resident. Fix: confirm both fields before calculating.
Forgetting cess or surcharge
Error: choosing the regime with the lower pre-cess slab tax. Fix: apply surcharge, marginal relief where relevant and 4% cess before comparing final totals.
Blending special-rate income with slab income
Error: taxing all capital gains or other special-rate income using the ordinary slabs. Fix: keep income heads separate and follow their applicable treatment.
Assuming a business taxpayer can switch freely
Error: treating Form 10-IEA as optional or assuming an immediate return to the new regime. Fix: confirm the filing procedure and lifetime switching restriction before opting out.
Missing the return due date
Error: deciding on the old regime but filing after the applicable section 139(1) due date. Fix: make the election through the permitted route by the due date for the taxpayer’s circumstances.
A practical decision rule
Use the new regime as the starting point because it is the default for eligible taxpayers, then calculate the old regime rather than assuming either one wins. The comparison is strongest when it includes every income head, regime-specific deduction, age and residency detail, rebate, surcharge, special-rate treatment and cess. If the old-regime result is lower, confirm that the taxpayer can validly elect it and understand the switching consequences before filing.
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