Old vs New Tax Regime: A Break-Even Comparison Working

Compare two employees earning ₹12 lakh with very different eligible deductions and income types. The useful result is a working that explains the facts, the calculation or classification, and the evidence behind the conclusion. This guide shows how to prepare that working and where a reviewer should investigate before accepting the result.

Scope and applicable period

Indian income-tax preparation for FY 2025–26 / AY 2026–27 under the Income-tax Act, 1961. The Income-tax Act, 2025 applies from Tax Year 2026–27; later-period computations require the corresponding provisions and forms.

Verification date: 11 October 2026. Figures and rates identified as assumptions are teaching examples; apply the stated conditions and the actual facts to a real assignment.

The key principle

Compare tax on taxable income under each regime, not tax on the same gross salary. Standard deduction, eligible deductions, special-rate income and rebate conditions differ. For AY 2026-27, the new-regime rebate for eligible resident individuals covers ordinary slab tax up to the statutory limits; special-rate income needs separate attention. Business-income cases also require election-condition checks.

Worked example

This example is not a gross-salary break-even result. A salary computation may first subtract its applicable standard deduction and other permitted items. To compare a real taxpayer, start with gross income, create a separate deduction column for each regime, compute slab and special-rate tax and then apply eligible rebate, relief, surcharge and cess. A headline that says all income up to ₹12 lakh is tax-free misses residence and special-rate conditions.

A practical sequence

List ordinary and special-rate income, allowable deductions and the taxpayer’s business-income facts. Compute both regimes using the correct AY rates, rebate, surcharge and cess.

Check the permitted election process and switching restrictions for the taxpayer category. Explain the resulting difference with the actual assumptions.

A comparison based on gross salary alone can miss deductions, special-rate income and eligibility conditions; retain the computation rather than giving a universal break-even salary.

Important distinction

A break-even comparison requires the actual deduction difference between regimes. Calculate old-regime tax at several deduction levels while holding the complete income facts constant, then identify where the results cross. The same-taxable-income table above demonstrates rebate mechanics; it is not a universal gross-salary break-even result.

Keep gross amounts, taxable amounts and credits distinct

A tax preparation file should explain the movement from source documents to taxable income and then from computed tax to the amount payable or refundable. Gross receipts, bank credits and information-statement values can measure different things. Reconcile them before applying tax rates or claiming credit. Record residential status, income character and the chosen regime where relevant, because these affect treatment. A deduction or withholding certificate establishes one part of the evidence; it does not replace the complete income computation. Maintain a separate list of missing documents and unresolved classification questions.

Evidence checklist

Keep the following records linked to the same entity, period and working version. Identify missing items explicitly; a checked box should mean the document was examined and supports the stated conclusion.

• Income by head and tax rate category
• Deduction and exemption evidence
• Age and residential-status facts
• Both regime computations for the same year
• Election requirements and acknowledgement where applicable

Common mistakes and how to avoid them

• Comparing gross salary directly with taxable-income limits. Compare the conclusion with the income by head and tax rate category and resolve any conflicting facts.
• Applying slab rebate to all special-rate tax. Trace the affected item to the age and residential-status facts before finalising the working.
• Ignoring business-income election conditions. Use the election requirements and acknowledgement where applicable to make the final position and remaining exceptions clear.

Before you finalise

Recheck the example’s assumptions against the actual assignment, resolve the identified exceptions and make the final figure or conclusion traceable to its source. Preserve the reviewed version and the reason for material changes. For this task, the election requirements and acknowledgement where applicable should agree with the conclusion presented to the client, reviewer or authority.

Frequently asked question

Does the lower slab percentage always identify the better regime? No. Compute both taxable incomes and the applicable rebates and restrictions first.

Sources and further reading

• Income Tax Department — individual return and tax rates, AY 2026–27
• CBDT Budget 2026 FAQs

Related guide: Tds rates thresholds tax year 2026 27.