Key takeaways
- The calculator needs your gross income and regime choice before anything else — everything below adapts based on which regime you pick
- New regime deductions are limited to a handful of items (employer NPS, Agniveer corpus, family pension) — most familiar deductions like 80C and 80D only apply in the old regime
- The HRA section auto-calculates your exemption from four inputs — you don't need to work out the formula yourself
- The "New vs Old Regime Comparison" section is the most useful part of the tool — it tells you which regime actually saves you more, based on your real numbers
- Watch for the rebate notice under Section 87A — if it appears, your final tax liability may drop to zero even if the slab-wise tax looks non-zero
Why this calculator is worth five extra minutes
Most people open an income tax calculator, punch in their salary, glance at one number, and close the tab. That's a missed opportunity — this particular tool does a lot more than spit out a tax figure. It compares both regimes side by side, breaks your tax down slab by slab, auto-calculates your HRA exemption, and flags smart insights specific to your numbers.
This guide walks through every section of the calculator in order, so you get the full picture instead of just the headline number.
Try the Income Tax Calculator
Open the income tax calculator in a second tab and follow along as you read.
Step 1: Set your financial year and age category
At the top of the calculator, you'll see two toggles: Financial Year and Age Category.
- Financial Year: the calculator defaults to the current FY, with the previous FY available as a second tab. Pick whichever year you're actually filing or planning for — slab rates and rules can differ slightly between years.
- Age Category: choose Below 60, Senior (60–80), or Super Senior (80+). This matters more than it looks — it changes your basic exemption limit in the old regime and your 80D and 80TTB deduction caps.
Easy to miss: if you're calculating tax for a parent who's a senior citizen, don't forget to switch this toggle. Leaving it on "Below 60" by default can meaningfully overstate their tax liability.
Step 2: Choose your tax regime
Right below age category sits the regime toggle — New Regime or Old Regime. This single choice changes almost everything else you'll see on the page, since each regime unlocks a different set of deduction fields further down.
If you're not sure which regime to pick: that's completely fine — pick either one to start, enter your numbers, and use the New vs Old Regime Comparison section near your results to see which one actually works out cheaper for you. Don't try to guess this upfront.
Step 3: Enter your income sources
The calculator breaks your income into five separate fields rather than one lump "total income" box — this matters because each source is taxed slightly differently.
| Field | What to enter |
|---|---|
| Gross Salary Income | Basic + DA + HRA + allowances, before any deductions |
| Income from Other Sources | Freelance or business income, capital gains taxed at slab rate, etc. |
| Income from Interest | FD interest, savings account interest, bonds |
| Gross Rent from Let-out Property | Total annual rent received, before any deduction |
| Home Loan Interest (Self-occupied / Let-out) | Annual interest paid, split by property type |
A convenience built in: if you enter interest income, the calculator auto-applies your 80TTA (up to ₹10,000) or 80TTB for seniors (up to ₹50,000) deduction on its own in the old regime — you don't need to add this separately under deductions.
Step 4: Home loan interest fields — old regime only
If you're repaying a home loan, there are two separate fields depending on how the property is used:
- Self-occupied: deductible up to ₹2,00,000 under Section 24(b), only in the old regime
- Let-out: the full interest amount is deductible against your rental income with no upper cap, though the net loss you can set off against other income is capped at ₹2 lakh under Section 71
Neither field affects your tax if you're on the new regime — the calculator will simply not apply them, since home loan interest deduction isn't available there.
Step 5: New regime deductions (if you picked New Regime)
A common misconception is that the new regime has zero deductions. It has far fewer, but not none. Expand the New Regime Deductions section and you'll find three fields:
- 80CCD(2) – Employer NPS Contribution: your employer's NPS contribution, deductible up to 14% of Basic + DA. Enter your Basic salary in the HRA section further down so the calculator can apply this cap accurately.
- 80CCH – Agniveer Corpus Amount: applicable if you're contributing to the Agniveer Corpus Fund.
- Family Pension Standard Deduction: the lower of ₹25,000 or one-third of the family pension received.
Step 6: Old regime deductions (if you picked Old Regime)
This is where the old regime earns its reputation as "more deductions, more paperwork." The calculator groups them into a expandable section with sliders and number inputs for each:
| Deduction | What it covers | Typical cap |
|---|---|---|
| Standard Deduction | Automatic for salaried/pensioners | ₹50,000 |
| 80C | PPF, ELSS, LIC, NSC, 5-yr FD, home loan principal | ₹1,50,000 |
| 80D | Health insurance premium — self, family, and parents | ₹75,000 (below 60) / ₹1,00,000 (senior taxpayer) |
| 80CCD(1B) | Your own additional NPS contribution, over and above 80C | ₹50,000 |
| Other Deductions | 80E (education loan interest), 80G (donations), 80U (disability), etc. | Varies by section |
You can either drag the slider or type the exact figure into the number box next to it — both stay in sync, so use whichever feels faster.
Step 7: Use the built-in HRA exemption calculator
If you're claiming HRA in the old regime, don't calculate the exemption by hand — the calculator has a dedicated auto-calculator for exactly this, tucked inside the old regime deductions section.
It needs four inputs:
- Basic Salary per annum
- Dearness Allowance (DA) per annum — usually ₹0 for most private-sector employees, worth checking your payslip if unsure
- HRA Received per annum — your monthly HRA component × 12
- Total Rent Paid per annum — your monthly rent × 12
Then toggle whether you live in a metro city or not. The exemption formula uses 50% of Basic+DA for metros and 40% for non-metros, and the calculator applies whichever of the three HRA rules gives you the lowest — and hence most tax-efficient — exempt amount, automatically.
Don't skip this if you're paying rent. Your rent needs to exceed 10% of Basic+DA for any HRA exemption to apply at all — the calculator handles this check for you, but it's worth understanding why a very low rent amount might show a smaller exemption than you expected.
Step 8: Reading your results
Once your inputs are in, the results panel updates live. Here's what each part is telling you:
- Annual Tax Payable (the hero number): your total tax liability for the year, with a monthly breakdown right underneath so you know what to set aside each month.
- Effective Rate: your tax as a percentage of gross income — a more honest number than your top slab rate, since it reflects your blended tax across all slabs.
- Taxable Income, Surcharge, Cess: the building blocks behind the headline number, useful if you want to sanity-check the maths yourself.
- Income Breakdown donut chart: a visual split of your gross income into In-hand/Net, Deductions, Income Tax, and Cess+Surcharge — hover over any segment for the exact amount and percentage.
Step 9: Check the tax slab breakdown
Expand the Tax Slab Breakdown section to see exactly how much of your income falls into each slab, and how much tax each slab contributes. This is the section to check if a number looks off, or if you're trying to understand exactly where your tax is coming from rather than just accepting a final figure.
Step 10: Use the New vs Old Regime Comparison — this is the real payoff
This is arguably the most useful section in the entire calculator, and the one most people skip. Expand New vs Old Regime Comparison and it runs your exact same income and deduction inputs through both regimes side by side, then tells you which one actually saves you money.
Why this matters more than picking a regime upfront: the "better" regime depends entirely on how many deductions you actually claim. Someone with a home loan, HRA, and full 80C utilisation often does better under the old regime. Someone with minimal deductions almost always does better under the new one. Rather than guessing, let this section do the comparison for you.
Step 11: Read the Smart Tax Insights
Below the regime comparison, expand Smart Tax Insights for a list of observations tailored to your specific numbers — things like unused deduction headroom, or a nudge if you're close to a slab boundary where a small change in income or deductions could shift your tax meaningfully.
A note on the Section 87A rebate
If your final tax liability drops to zero, you may see a rebate notice appear near your results, referencing Section 87A. This rebate can zero out your tax liability entirely if your taxable income falls within the applicable threshold for your chosen regime — don't be alarmed if your slab-wise tax shows a figure but your final payable amount reads zero; that's this rebate doing its job.
Common mistakes to avoid while using this calculator
- Entering gross salary as your "net" or in-hand salary by mistake — the field expects the figure before any deductions
- Forgetting to fill in the HRA section's Basic Salary field, which also feeds into the 80CCD(2) employer NPS cap in the new regime
- Assuming the new regime has zero deductions and skipping that section entirely — you could be missing a real employer NPS or family pension deduction
- Not checking the regime comparison section, and instead sticking with whichever regime you picked out of habit
- Leaving age category on "Below 60" when calculating for a senior citizen, which understates their 80D and 80TTB benefits
Frequently asked questions
Which regime should I select first when using the calculator?
It doesn't matter which one you start with — enter your income and deduction details either way, then check the New vs Old Regime Comparison section, which runs the numbers for both and shows you the cheaper option based on your actual figures.
Does the calculator auto-apply the 80TTA/80TTB deduction?
Yes, if you enter an amount in the interest income field, the calculator automatically applies the 80TTA deduction (up to ₹10,000) or the higher 80TTB deduction for senior citizens (up to ₹50,000) in the old regime — no separate entry needed.
Why don't I see home loan interest fields affecting my tax in the new regime?
Home loan interest deduction under Section 24(b) is only available in the old regime. If you're on the new regime, the calculator won't apply this deduction even if you've filled in the home loan interest fields.
How does the calculator work out my HRA exemption?
It takes your Basic Salary, DA, HRA received, and rent paid, along with whether you live in a metro city, and automatically applies the lowest of the three HRA exemption rules — which is the amount you're legally entitled to exempt.
What does it mean if a rebate notice appears under Section 87A?
It means your taxable income falls within the threshold where this rebate applies, reducing your final tax liability to zero, even if the slab-wise calculation shows a non-zero tax amount before the rebate is applied.
Can I use this calculator to compare last year's tax with this year's?
Yes, the Financial Year toggle lets you switch between the current FY and the previous FY, so you can compare how your tax liability would differ between the two years using the same income figures.
One last thing to keep in mind: this calculator provides an estimate based on announced tax slabs and standard deduction rules. Your actual tax liability can be affected by details specific to your situation — multiple employers in a year, arrears, or less common deduction categories. For anything beyond a straightforward salary-based return, it's worth a quick check with a qualified chartered accountant before filing.
