Income Tax Return (ITR) Filing in India: A Clear Guide for Individuals, Professionals and Businesses

Why careful ITR filing matters

Filing an income tax return is a legal obligation for many people and businesses in India, and much more than a formality. A correctly filed return is proof of income for loans, visas and tenders, the route to claiming refunds, and protection against notices and penalties. A carelessly filed one can create problems that take months to resolve.

The process has become far more data-driven. The Income Tax Department already knows a great deal about your income through TDS returns, bank reports, securities transactions and other sources, and it compares this with your return automatically. Mismatches are the most common trigger for notices.

This guide explains the main parts of income tax and ITR filing in plain language. It is general information, not tax advice. Tax laws change through each year’s Finance Act and notifications, and a new Income-tax Act, 2025 has been enacted to replace the 1961 Act from 1 April 2026, which may change forms and section references. Always confirm current rules on the official income tax e-filing portal or with a qualified professional.

Who must file a return?

Broadly, individuals must file when their total income exceeds the basic exemption limit applicable to them. Companies and firms must file regardless of profit or loss. Certain other conditions can also make filing mandatory, for example specified high-value transactions, foreign assets or income, or large deposits or expenditure set out in the rules.

Even when not mandatory, filing is often wise: to claim a refund of TDS, carry forward losses, maintain a record of income for loans and visas, or simply avoid questions later.

Which ITR form applies?

Filing the wrong form can make the return defective, requiring correction. Eligibility conditions are revised from time to time, so check the current year’s instructions on the portal.

Old regime or new regime?

Individuals and HUFs can choose between two tax regimes. The new regime, which became the default from financial year 2023-24, offers lower slab rates but removes most deductions and exemptions. The old regime has higher rates but allows deductions such as those for certain investments, insurance premiums, home loan interest and house rent allowance, subject to conditions.

Which is better depends entirely on your figures. Someone with large eligible deductions may pay less under the old regime; someone with few deductions usually benefits from the new one. Salaried individuals can generally choose each year, while those with business income face restrictions on switching back and forth. Calculating both, every year, is the only reliable way to decide.

AIS and Form 26AS: check before you file

The Annual Information Statement (AIS) and Form 26AS show information the department has received about you: TDS and TCS, salary, interest, dividends, securities transactions, property purchases, foreign remittances and more.

Before filing, compare your income and tax credits with AIS and Form 26AS. Missing interest income, unreported capital gains or TDS credits that do not match are common causes of notices. If AIS contains incorrect information, you can submit feedback on the portal. Reconciling first saves trouble later.

Income from business or profession

Business owners and professionals have more to manage. Income must be computed from properly maintained books, with allowable expenses, depreciation and adjustments. Turnover above specified limits requires a tax audit, which changes the filing deadline.

Small businesses and certain professionals may opt for presumptive taxation, which deems a percentage of turnover or receipts as income and reduces record-keeping, subject to conditions and limits. It can be attractive, but it is not always the lowest-tax option, and opting out later may have consequences. Good accounting & bookkeeping throughout the year makes business ITRs far simpler.

Capital gains

Selling shares, mutual funds, property, gold or other assets can create capital gains, taxed differently depending on the asset and holding period. Rates, holding-period thresholds and exemptions have changed in recent budgets, so the year of sale matters.

Capital gains are a frequent source of mismatches because brokers and registrars report transactions to the department. Gathering statements from all brokers, computing gains correctly, and claiming any exemptions properly is essential, especially in years with property sales.

Advance tax: pay as you earn

If your estimated tax liability for the year, after TDS, is ₹10,000 or more, you are generally required to pay advance tax in instalments during the year. For most taxpayers, the schedule has been: 15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March, with a single instalment by 15 March for those under presumptive taxation. Resident senior citizens without business income are generally exempt.

Missing or underpaying advance tax leads to interest. Professionals and business owners are most often caught out, because no employer deducts tax for them. A quarterly estimate, as part of tax planning & advisory, avoids this.

Due dates, belated and updated returns

For individuals not requiring an audit, the due date has typically been 31 July after the end of the financial year; for taxpayers requiring a tax audit, typically 31 October; with later dates for transfer pricing cases. Dates are sometimes extended by notification, so check the portal each year.

If you miss the due date, a belated return can generally still be filed within the time allowed, usually with a late fee and loss of some benefits, such as carrying forward certain losses. A revised return corrects mistakes in a return already filed. An updated return allows taxpayers to report additional income within an extended window by paying additional tax, but cannot be used to reduce tax or claim a larger refund.

Filing, e-verification and refunds

Filing is not complete until the return is verified. E-verification through Aadhaar OTP, net banking or other methods is the quickest route, and must be done within the time allowed after filing, or the return may be treated as invalid.

Refunds are processed after the return is processed and credited to a pre-validated bank account. Keeping your bank account validated and your contact details current on the portal avoids delays.

Common ITR mistakes

Almost all of these are avoided by reconciling with AIS and Form 26AS and reviewing the computation before filing.

• Choosing the wrong ITR form
• Not reporting interest from savings, deposits or refunds
• Missing capital gains reported by brokers
• Claiming TDS that does not appear in Form 26AS
• Picking a regime without comparing both
• Not disclosing foreign assets or income where required
• Missing advance tax instalments
• Forgetting to e-verify the return

Received an income tax notice?

Notices range from simple intimations after processing, to requests to explain mismatches, to scrutiny assessments. Many are generated automatically when reported information differs from the return. A notice is not necessarily an accusation, but every notice has a deadline and should be read carefully.

The right response starts with understanding exactly what is asked, gathering supporting documents, reconciling the figures and replying clearly through the portal on time. Where the department is right, correcting the position promptly limits further consequences. Where it is not, a well-documented reply often resolves the matter. Our team supports clients with responses and works with their chartered accountant on more complex proceedings.

Tax planning all year, not only in July

The best ITR is the result of decisions made during the year: choosing a regime, structuring salary components where possible, timing investments and asset sales, paying advance tax on time and keeping clean records. Planning in April is far more effective than scrambling in July.

For business owners, personal tax is closely linked to business finance: how profits are drawn, how assets are held and how the business is structured. A Virtual CFO or tax adviser can help align both.

Documents to keep ready

Collecting these early, ideally soon after the financial year ends, turns ITR filing into a calm review rather than a last-minute search.

• PAN and Aadhaar (linked), and pre-validated bank account details
• Form 16 from employers and Form 16A or other TDS certificates
• AIS, TIS and Form 26AS downloaded from the portal
• Bank and deposit interest statements
• Capital gains statements from brokers and mutual fund registrars
• Rent receipts, home loan interest certificates and investment proofs if using the old regime
• Books of account, financial statements and audit report for business income
• Details of foreign assets and income, where applicable

Special situations worth extra care

Some situations deserve professional review even for experienced filers: the year you sell a property, receive ESOPs or RSUs, earn income abroad or return to India, start freelancing alongside a job, inherit assets, or receive a large gift. Residential status in particular affects which income is taxable in India and which disclosures are required, and it is often misunderstood by people who travel frequently.

Getting help with ITR filing

Many people file simple returns themselves. Professional help is worthwhile when you have business or professional income, capital gains, multiple properties, foreign income or assets, past notices, or simply limited time. A good adviser checks AIS, compares regimes, chooses the right form, reviews the computation and stays available if questions arise later.

Our Accounts & Finance team handles ITR filing for individuals, professionals, firms and companies, alongside GST, TDS and bookkeeping. Read our GST compliance guide and complete finance guide, or talk to a tax expert.

Frequently asked questions

• Can I revise my return if I made a mistake?

  Generally yes. A revised return can be filed within the time allowed to correct errors or omissions, and an updated return may be used to report additional income within its own time limits.

• Which ITR form should I file?

  It depends on your residential status and income types. Simple salary income usually uses ITR-1 within its limits; capital gains need ITR-2; business or professional income needs ITR-3, or ITR-4 under presumptive taxation. Check the current year’s eligibility on the portal.

• Should I choose the old or new tax regime?

  Calculate tax under both using your actual income and deductions. The new regime suits people with few deductions; the old regime can be better for those with large eligible deductions.

• What happens if I miss the ITR due date?

  You can generally file a belated return within the time allowed, usually with a late fee and loss of some benefits such as carrying forward certain losses. Interest may also apply on unpaid tax.

• Why does AIS matter?

  AIS shows income and transactions reported to the department. Reconciling your return with AIS and Form 26AS before filing helps avoid mismatches and notices.

• Do professionals and freelancers need to pay advance tax?

  Generally yes, if their estimated tax after TDS is ₹10,000 or more. Missing instalments leads to interest.

• Can you reply to an income tax notice for me?

  Yes. We review the notice, reconcile figures, prepare documentation and respond through the portal, working with your chartered accountant where required.

Still curious? Ask the assistant Talk to a specialist →

Explore our Accounts & Finance services