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Difference between new & old tax regime

Difference between new & old tax regime: calculation method, required inputs, worked check, limitations and a link to Income Tax Calculator India. Reviewed 2...

By Uddhav Gopani, FounderPublished 25 September 2026Reviewed 25 September 2026

The structural difference between the two Indian tax regimes is philosophical. The old regime taxes a smaller base at steeper rates — you shrink taxable income with 80C, HRA, 80D, home-loan interest and other deductions, then pay 0/5/20/30% on what remains. The new regime taxes a wider base at gentler rates and removes almost every deduction in exchange.

What this specific question is asking

Mechanically, the differences are: slab schedules (four old bands vs eight new bands), the standard deduction (₹50,000 old vs ₹75,000 new), the 87A rebate ceiling (₹5 lakh taxable old vs ₹12 lakh new), and the deduction list (extensive old vs nearly empty new). Default status also differs: the new regime is now the default unless you opt out.

Check which regime your employer or filing software applied as default — since the new regime became the default, an unexamined payslip may already be computed under rules you did not choose. The choice is made per financial year, and salaried taxpayers can switch each year.

Inputs to verify

Verify income type before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify gross annual income (₹) before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify tax regime before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify deductions, old regime (₹) before calculation; if this value uses a different unit, period or definition, convert or restate it first.

Step-by-step check

Enter your gross annual income.
Choose the New regime or the Old regime.
If you picked Old, enter your total eligible deductions (the New regime ignores them).
Tap Calculate for the tax, the 4 percent cess, and your effective rate.

Worked example and sanity check

As a worked reference for “Difference between new & old tax regime”, Worked example FY 2025-26, AY 2026-27 · old regime · income type: salary / eligible pension. On ₹7,00,000 gross salary the salary standard deduction of ₹50,000 applies (it does not apply to freelance / business / other income); assuming no other eligible deductions, taxable income is ₹6,50,000. Under the old-regime slabs (nil to ₹2,50,000; 5% on ₹2,50,001–5,00,000; 20% above ₹5,00,000): ₹12,500 + 20% × ₹1,50,000 = ₹42,500 , plus 4% health & education cess = ₹44,200. This calculator adds the 4% cess and applies the new-regime simplified rebate-threshold marginal relief just above ₹12,00,000, but does not calculate surcharge or other high-income marginal relief . These are FY 2025-26 / AY 2026-27 figures, not timeless “current rates.” Compare the resulting magnitude with a hand calculation; if those disagree materially, inspect the setup before trusting the decimal precision.

Interpreting the result

So what does the number mean? In the worked example the calculation produced ₹6,50,000. A result in that range is plausible for this kind of input; if your result lands far from it, revisit income type first — it is the input most often entered on the wrong basis. Read the magnitude before the decimals: a result ten times too large or small almost always means a unit or period slipped, not that the formula failed.

Reviewed 25 September 2026

Verify any current tax threshold, lender rate, provider rule or health guidance with the authoritative source before acting.

Use the Income Tax Calculator India

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Authoritative references

Income Tax Department of India

Common questions

Which inputs matter most for difference between new & old tax regime?

The key inputs are Income type, Gross annual income (₹), Tax regime, Deductions, old regime (₹). Match their units and periods before using Income Tax Calculator India.

How can I check an answer for difference between new & old tax regime?

Run the example exactly as written, then vary income type alone. A result that tracks that change predictably tells you the setup — units, periods, definitions — is correct.

When should I recalculate difference between new & old tax regime?

Re-run it when the real-world inputs move — new measurements, changed rates or thresholds, or a different unit convention on the same quantity.