How to File Your ITR Online: A Step-by-Step Guide

Filing an income tax return used to mean queues, paper forms, and a visit to a tax practitioner. Today, for the majority of salaried Indians, it is a free online process that can be finished in under an hour — the tax department pre-fills most of your data, and you mainly verify and correct it. The barrier is no longer difficulty; it is unfamiliarity.

This guide takes you through the entire sequence on the official portal at incometax.gov.in for FY 2025-26 (AY 2026-27): what to gather, which form to pick, how to use the pre-filled data sensibly, and the critical final step of e-verification that many first-timers forget.

Before You Start: Gather Your Documents

Filing is fast when your inputs are ready. Pull these together first:

• PAN and Aadhaar, which must be linked — an unlinked PAN can become inoperative and block filing.
• Form 16 from your employer, summarising salary and TDS. Understand it using our Form 16 explained guide.
• Form 26AS and the AIS (Annual Information Statement), downloaded from the portal — these show all tax credited and high-value transactions reported against you. See Form 26AS and AIS.
• Bank details, including a pre-validated account for any refund, and interest certificates for savings/FD interest.
• Proof of deductions you intend to claim — 80C investments, 80D health insurance, home loan interest, and so on (relevant under the old regime).
• Capital gains statements from brokers or mutual funds, if any.

Our tax document checklist is a handy way to make sure nothing is missing before you log in.

Step 1 — Log In and Confirm Your Profile

Go to incometax.gov.in and log in with your PAN (which serves as your User ID) and password. First-time users register using their PAN. Once in, confirm that your contact details, bank accounts, and Aadhaar link are correct under your profile. A pre-validated bank account is essential — refunds are only credited to a validated account.

Step 2 — Choose the Right Form and Regime

The portal will guide you, but it helps to know which ITR form fits your situation:

Your situation	Likely form
Salary, one house, interest income (income ≤ ₹50 lakh)	ITR-1 (Sahaj)
Capital gains, more than one house, foreign assets, or crypto	ITR-2
Business or professional income (regular books)	ITR-3
Presumptive income under 44AD/44ADA	ITR-4 (Sugam)

Our which ITR form guide explains the choice in detail. Choosing the wrong form is a common reason returns are treated as defective.

You will also select your tax regime. The new regime is the default; choose the old regime only if your deductions justify it. Work this out beforehand using our old vs new tax regime guide and the income tax calculator, because for most salaried filers the regime decision drives the entire return.

Step 3 — Review the Pre-Filled Data Carefully

This is the step that matters most. The portal pre-fills your return with data it already holds — salary from your employer's TDS return, interest reported by banks, TDS from Form 26AS, and high-value transactions from the AIS.

Do not blindly accept it. Reconcile every pre-filled figure against your own documents:

• Does the salary match your Form 16?
• Does the TDS match Form 26AS?
• Is the interest income complete? The AIS sometimes misses small amounts, and sometimes double-counts — both happen.
• Are your capital gains correctly reflected?

If the pre-filled data is wrong, correct it. You are responsible for the final figures, not the portal. Mismatches between what you file and what the AIS shows are the leading cause of income tax notices, so reconciliation is not optional.

Step 4 — Enter Deductions and Compute Tax

If you are on the old regime, enter your deductions in the relevant schedules — 80C up to ₹1.5 lakh, 80D for health insurance, home loan interest under Section 24(b), HRA (compute it with our HRA exemption calculator), and NPS under 80CCD(1B). Under the new regime, most of these are not allowed, so the deduction schedules stay largely empty.

The portal then computes your tax automatically, showing whether you owe additional tax or are due a refund. If tax is payable, pay it online via the e-pay tax facility and enter the challan details before submitting.

A Worked Example: Anita's Return

Anita, a salaried professional in Mumbai, files for FY 2025-26. Her Form 16 shows:

• Gross salary: ₹14,00,000
• TDS deducted by employer: ₹95,000
• She is on the new regime (her employer deducted TDS accordingly).

On the portal:

1. She logs in; salary of ₹14,00,000 and TDS of ₹95,000 are pre-filled.
2. She checks Form 26AS — the ₹95,000 TDS matches. Good.
3. She checks the AIS and notices ₹12,000 of savings-bank and FD interest that was not in the pre-filled salary data. She adds it as income from other sources.
4. Her taxable income becomes ₹14,00,000 − ₹75,000 standard deduction + ₹12,000 interest = ₹13,37,000.
5. The portal computes tax under the new regime slabs. On ₹13,37,000 taxable it works out to about ₹83,772 including cess.
6. Since ₹95,000 was already deducted as TDS — more than her ₹83,772 liability — she is due a refund of about ₹11,200. She double-checks her pre-validated bank account so the refund can be credited.
7. She submits and then e-verifies via Aadhaar OTP.

Had Anita ignored the ₹12,000 interest the AIS already knew about, she would likely have received a mismatch notice later. Reconciliation took her five minutes and saved that hassle.

Step 5 — Submit and E-Verify (The Step People Forget)

After submission, your return is not complete until you e-verify it. You have 30 days to do so. If you do not, the return is treated as invalid — as if you never filed.

The fastest method is an Aadhaar OTP sent to your Aadhaar-registered mobile, which verifies instantly. Other options:

• Net banking login to the tax portal
• EVC through a pre-validated bank or demat account
• Posting a signed physical ITR-V to the CPC in Bengaluru (slowest; only if you cannot e-verify)

Once verified, you will receive a confirmation, and the return goes for processing. Any refund follows to your pre-validated bank account.

Online vs Offline Utility: Which to Use

The portal offers two ways to file, and beginners often pick the harder one by accident.

• Online (in-browser) filing — you fill the form directly on the portal, with pre-filled data loaded automatically. This is the simplest route and is ideal for ITR-1 and ITR-4, and increasingly for ITR-2. Everything happens in your browser; nothing to download.
• Offline utility (JSON) — you download the department's utility, fill it on your computer, generate a JSON file, and upload it. This suits complex returns (ITR-2 and ITR-3 with many schedules) and lets you work without a constant internet connection. It also helps if your return is large enough that the browser feels sluggish.

For most salaried filers, the online route is faster and less error-prone. Reach for the offline utility only if your return is genuinely complex or the in-browser form is struggling with the volume of entries.

What to Do If You Find a Mistake After Filing

Filing the wrong figure is not a disaster if you catch it. The portal allows a revised return under Section 139(5), which you can file any number of times before the end of the assessment year (or before assessment is completed, whichever is earlier). The revised return simply replaces the original.

So if you realise after submitting that you forgot some interest income, claimed a deduction incorrectly, or used the wrong figure, you do not need to panic — file a revised return with the correct details and e-verify it. The revised return must reference the original return's acknowledgement number. This is far better than leaving an error to be picked up by the department later, which can mean a notice and interest. Note that a revised return is for genuine corrections; it is not a backdoor to keep changing your mind, and repeated drastic revisions can attract attention.

Refunds: How and When

If your TDS and advance tax exceed your final liability, you are due a refund, credited directly to your pre-validated bank account linked to your PAN. Once your return is processed by the Centralised Processing Centre, the refund is usually issued within a few weeks for straightforward returns, though timing varies with volume.

Two things commonly delay refunds: an unvalidated or PAN-mismatched bank account (validate it before filing), and a mismatch between your return and the AIS/26AS that puts the return into closer review. You can track refund status on the portal under the relevant service. Interest is payable by the department on delayed refunds in certain cases, but the cleanest path to a fast refund is an accurate, reconciled return filed early with a validated account.

Mind the Deadline

The usual due date for most individuals (those not requiring an audit) is 31 July of the assessment year. Filing on time matters for two concrete reasons:

1. Carry-forward of losses — capital losses and business losses can only be carried forward for 8 years if you file by the due date.
2. Avoiding late fees and interest — a belated return attracts a fee of up to ₹5,000 (₹1,000 if income is below ₹5 lakh) plus interest on unpaid tax.

If you do miss it, you can usually still file a belated return until 31 December of the assessment year, but at a cost.

Common Mistakes

Skipping e-verification. The most damaging error. An unverified return is treated as never filed. Verify within 30 days, ideally immediately.

Trusting pre-filled data blindly. The portal's figures can be incomplete or wrong. Reconcile against Form 16, Form 26AS, and the AIS every time — see ITR filing mistakes.

Choosing the wrong form. Filing ITR-1 when you have capital gains or crypto makes the return defective. Match the form to your income — see which ITR form.

Forgetting small interest income. Savings and FD interest is reported in the AIS. Omitting it triggers mismatches even when the amount is tiny.

Not pre-validating the bank account. Refunds fail if your account is not pre-validated and PAN-linked.

Picking the wrong regime by default. The new regime is the default; if the old regime saves you more, you must actively select it. Decide first with the regime guide.

Leaving it to the last day. The portal slows down near deadlines and errors are easy to make under time pressure.

What to Do Next

• Gather your PAN, Aadhaar, Form 16, Form 26AS, AIS, and deduction proofs using the tax document checklist.
• Confirm PAN-Aadhaar linkage and a pre-validated bank account on the portal.
• Decide your tax regime in advance with the income tax calculator.
• Select the correct ITR form for your income type.
• Reconcile every pre-filled figure against your own documents; add anything missing.
• Enter deductions (old regime) and let the portal compute the tax; pay any balance online.
• Submit, then e-verify within 30 days — preferably instantly via Aadhaar OTP.
• Save the acknowledgement (ITR-V) and confirmation for your records.
• File well before 31 July to preserve loss carry-forward and avoid late fees.

One more habit worth building. Keep a small folder — physical or digital — for each financial year holding your Form 16, Form 26AS, AIS, deduction proofs, and the final ITR-V acknowledgement. The tax department can pick up a return for review years after filing, and having the supporting documents at hand turns a stressful query into a five-minute reply. Filing is an annual event, but record-keeping is a year-round habit that makes the next filing season effortless.

Filing your ITR online is genuinely manageable for most people. Treat the pre-filled data as a draft to be checked rather than a finished return, never skip e-verification, and file before the deadline — do those three things and the rest is routine.

Disclaimer: This article is for educational purposes only and is not tax advice. Tax rules change frequently — verify current provisions on the official income tax portal or with a qualified CA before filing.