Assumptions
- India tax logic is a simplified FY 2026-27 salaried-individual model.
- New-regime marginal relief is modeled in simplified form; surcharge, special-rate incomes, and state-specific details are not fully modeled.
- Verify current rules with a qualified tax advisor before filing or choosing a regime.
Formula Used
Tax = slab tax on taxable income + 4% cess
Taxable income applies standard deduction and user-entered deductions based on the selected regime assumptions.
Example tax regime comparison
- Enter annual gross income.
- Add old-regime deductions.
- Compare estimated tax under both regimes.
Common Mistakes and Limitations
Common mistakes
- Treating an estimate as a guaranteed outcome.
- Ignoring fees, taxes, penalties, or changing rates.
- Using annual and monthly rates interchangeably.
- Forgetting that a calculator is only as reliable as the inputs entered.
Limitations
- The rule may be too simple for complex financial situations.
- It does not replace personalized advice from a qualified professional.
- Real results can change because of taxes, fees, rates, inflation, and behavior.
Full guide
How to use this calculator well
Open for inputs, methodology, useful cases, and deeper educational notes.
What is Old vs New Tax Regime Calculator?
Old vs New Tax Regime Calculator answers a specific tax question without opening a spreadsheet. Enter annual gross income and eligible old-regime deductions & exemptions, review the estimate as you type, and open the formula block to see how the result is produced.
It uses INR defaults, Indian number formatting, and India-specific assumptions where relevant.
Inputs explained
Annual gross income
Your total taxable income for the year before any deduction. Salary plus anything else taxable — interest, rent received, freelance income. Supported range: 0 to 100,000,000.
Why it matters: Both regimes start from this figure, so anything missing here understates tax on both sides of the comparison.
A figure carried from the Salary Calculator is salary only. Add your other income to it.
Eligible old-regime deductions & exemptions
The total you can actually claim under the old regime — deductions like 80C, 80D, home loan interest and NPS, plus exemptions like HRA. Leave out the standard deduction: the calculator applies that itself, and entering it here would count it twice. Supported range: 0 to 100,000,000.
Why it matters: This is what the old regime trades its higher rates for, so the comparison turns on it. The new regime allows almost none of it.
Count what you can evidence, not what you could claim in principle. MoneyThinker does not check your eligibility.
Use this when
You want a quick planning estimate before comparing detailed options.
This answers
Screen which tax regime may be lower before doing a full filing calculation.
Example situation
Enter annual gross income. Add old-regime deductions. Compare estimated tax under both regimes.
Do not use this for
The rule may be too simple for complex financial situations.
Why this matters
Screen which tax regime may be lower before doing a full filing calculation.
Most salaried taxpayers can revisit this choice each year, so it is worth rechecking whenever your salary or your deductions change.
When this tool is useful
- You want a quick planning estimate before comparing detailed options.
- You need a simple way to explain the decision to yourself or a family member.
Sources and review notes
Source links are provided for methodology and rule checking. Always verify live tax or lender rules before making decisions.
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IndiaFAQ
What is an old vs new tax regime calculator?
An old vs new tax regime calculator estimates estimated tax under both Indian regimes from the inputs you provide. It shows the formula and the assumptions so you can check the working, rather than predicting a guaranteed outcome.
Are the results guaranteed?
No. The results are estimates based on the stated formula, your input values, and the assumptions listed on this page. Interest rates, tax rules, market returns, and inflation all change.