ITR-1 Calculator & Filing Guide (India) — Calculate Your Tax

For most salaried people in India, income-tax filing is simpler than it looks — it usually means a single form, ITR-1 (Sahaj). The hard part isn't the form; it's knowing your number in advance: how much tax you owe, whether the Old or New regime is cheaper for you, and which deductions you can actually claim. The free ITR-1 Calculator estimates your tax under both regimes side by side so you can see, in seconds, which one costs you less — with nothing uploaded.

This is general information, not tax advice. Rules and figures change and edge cases exist — confirm specifics with the official Income Tax Department portal or a qualified professional.

What is ITR-1 and who can file it?

ITR-1 is the simplest income-tax return, meant for a resident individual whose total income is up to ₹50 lakh and comes from:

• Salary or pension
• One house property (with some conditions)
• Other sources such as interest from savings accounts and deposits
• Agricultural income up to ₹5,000

You generally can't use ITR-1 if you have capital gains, business or professional income, more than one house property, foreign income or assets, or you're a company director. Those situations need a different form (ITR-2, ITR-3, and so on). If you're unsure, the official portal shows which form applies to you.

Income sources covered

For a typical salaried filer, the pieces are: your gross salary (from Form 16), interest from savings and fixed deposits, and any house-property income or home-loan interest. Add them up and that's your gross total income, before deductions. Interest income is easy to forget — it's taxable and already shows up in your Annual Information Statement (AIS), so leaving it out invites a mismatch notice.

How to calculate your income tax (step-by-step)

You don't need spreadsheets or a consultant to get a reliable estimate. Here's the flow:

1. Gather your documents. Keep Form 16, your bank interest certificates, and proof of any investments or premiums handy (full checklist below).
2. Open the ITR-1 Calculator and enter your salary or pension income, plus any interest income.
3. Add your deductions — 80C investments, 80D health-insurance premiums, home-loan interest, and so on.
4. Compare Old vs New side by side. The tool applies the correct slab rates and standard deduction for the year and shows the tax under each regime.
5. See your estimated refund or balance payable, then download a summary PDF to keep with your records or share with your accountant.

Everything runs in your browser — your income figures are never uploaded to a server.

Old regime vs New regime — which is better?

There's no universal answer; it depends entirely on how much you claim in deductions. The New regime has been the default since FY 2023-24, offering lower slab rates but removing most exemptions. The Old regime keeps higher rates but lets you subtract deductions like 80C, 80D and HRA. Broadly:

	Old regime	New regime
Slab rates	Higher	Lower
Deductions (80C, 80D, HRA…)	Available	Mostly not available
Standard deduction (salaried)	Yes	Yes
Best for	People who claim significant deductions	People with few deductions
Status	Opt-in	Default

The practical rule: if you invest heavily in 80C, pay a home-loan or claim large HRA, the Old regime often wins; if you claim little, the New regime's lower rates usually do. Rather than guess, run both — that's exactly what the calculator is for.

Deductions you can claim (Old regime)

• Section 80C (up to ₹1.5 lakh) — EPF, PPF, ELSS, life-insurance premiums, principal on a home loan, and children's tuition fees.
• Section 80D — health-insurance premiums for yourself and your family, with a higher limit when you also insure senior-citizen parents.
• Standard deduction for salaried individuals and pensioners.
• Home-loan interest under Section 24(b) on a self-occupied property.
• 80TTA / 80TTB — interest from savings accounts (a larger limit applies for senior citizens).

The New regime removes most of these but still gives salaried taxpayers a standard deduction. Because the exact figures change from year to year, the calculator applies the correct amounts for FY 2024-25 so you don't have to memorise them.

Step-by-step filing process

Once you know your number, filing itself is straightforward:

1. Estimate your tax with the calculator so there are no surprises.
2. Log in to the official Income Tax e-filing portal.
3. Choose ITR-1 and your assessment year; much of it is pre-filled from your employer's TDS.
4. Verify the pre-filled figures against your Form 16 and Form 26AS/AIS.
5. Enter deductions, confirm the regime, and review the computed tax.
6. Submit and e-verify (Aadhaar OTP is quickest) — filing isn't complete until you verify.

Document checklist

• Form 16 from your employer
• Form 26AS / AIS (tax-credit statement)
• Bank interest certificates
• 80C / 80D investment and premium proofs
• Home-loan interest certificate (if applicable)
• Bank details for any refund

Keep these as PDFs in one place — you can merge them into a single file or turn photos of paper documents into a PDF so everything's ready when you file.

Common mistakes to avoid

• Picking a regime by guesswork. Compare the actual numbers for your deductions.
• Skipping interest income. Bank interest is taxable and appears in your AIS.
• Not reconciling with Form 26AS/AIS. Mismatches trigger notices.
• Entering the wrong income. Use the figures from Form 16, not your take-home pay.
• Forgetting to e-verify. An unverified return is treated as not filed.

Frequently asked questions

How much tax will I pay?

It depends on your income, deductions and chosen regime. Enter your salary and deductions into the ITR-1 Calculator and it estimates your tax under both the Old and New regimes instantly, so you can see the exact figure and which option is cheaper.

Can I file ITR-1?

You can generally use ITR-1 if you're a resident individual with total income up to ₹50 lakh from salary or pension, one house property and other sources like interest. If you have capital gains, business income or more than one house property, you'll need a different form — check the official portal for your case.

Which deductions should I claim?

Under the Old regime, the common ones are 80C (up to ₹1.5 lakh), 80D for health insurance, home-loan interest, and savings-interest under 80TTA/80TTB. The New regime removes most deductions but keeps the standard deduction. Claim everything you're genuinely eligible for, and let the calculator show whether they make the Old regime worthwhile.

When is the ITR filing deadline?

For most individuals who don't need an audit, the usual due date is 31 July of the assessment year, though the government sometimes extends it. Always confirm the current deadline on the official e-filing portal, and file early to avoid last-minute issues.

What happens if I don't file on time?

Missing the deadline can mean a late-filing fee and interest on any tax due, and you may lose the ability to carry forward certain losses. If you owe nothing, penalties are smaller, but filing on time is still the safe move — the consequences of not filing at all are worse.

Is the calculator accurate?

It uses the FY 2024-25 slab rates and standard deduction for each regime, so the estimate is reliable for a standard salaried return. It's meant for planning and comparison; your final assessed tax on the official portal is authoritative, especially for unusual situations.

Can I calculate my income tax online for free?

Yes. The ITR-1 Calculator is completely free, needs no sign-up, and runs entirely in your browser — your salary and deduction figures are never uploaded.

Do I need a CA or tax consultant?

For a straightforward salaried ITR-1, most people can estimate and file on their own using the calculator and the pre-filled data on the portal. If your situation is complex — multiple income sources, capital gains, or a business — a qualified professional is worth it.

Is my financial data private?

Yes. Every calculation happens on your device. Nothing you type into the calculator is uploaded or stored anywhere, so your income and deduction details stay with you.

How long does the calculation take?

Usually a minute or two. Enter your income and deductions, and the Old-vs-New comparison and estimated refund or balance appear instantly.

Know your number before you file

Tax filing is far less stressful when you already know what you owe and which regime to pick. Open the ITR-1 Calculator, compare Old vs New in seconds, and download your summary — free, instant, and completely private. When you're ready to file, head to the official Income Tax e-filing portal.