Tax
Most first-time filers open the income tax portal expecting a form. What actually trips people up isn't the form itself, it's a handful of concepts nobody explains upfront. Once these click, the rest is mostly data entry.
Financial year and assessment year aren't the same thing
The financial year (FY) is the year you earned the income, April to March. The assessment year (AY) is the year right after, when that income gets assessed and taxed. Income earned between April 2025 and March 2026 is FY 2025-26 income, and you file it in AY 2026-27. Every form and portal screen uses this pairing, so getting it backwards is the single most common early confusion.
The two tax regimes aren't optional trivia
India currently runs two parallel tax structures: the new regime (the default one, with lower rates but fewer deductions) and the old regime (higher rates, but allows deductions like 80C, HRA, and home loan interest). You actively choose one when filing. Picking wrong doesn't just mean paying slightly more, it can mean missing deductions you'd already invested in expecting to claim. If you've been putting money into ELSS or PPF for the tax benefit, run both calculations before assuming the new regime's lower rates automatically win.
Form 16 is your starting point, not your only source
If you're salaried, your employer issues Form 16 after the financial year ends, summarizing your salary, TDS deducted, and (under the old regime) declared deductions. It's the natural starting point for filling your return. But it isn't complete. Interest from savings accounts and fixed deposits, freelance income, capital gains from mutual funds or stocks, none of that shows up on Form 16, and you're still required to report it.
Form 26AS and AIS show what the department already knows
Form 26AS is a consolidated statement of tax deducted or collected against your PAN. The Annual Information Statement (AIS) goes further, showing high-value transactions, interest, dividends, and mutual fund activity that's been reported to the department by banks and other institutions. Before filing, checking both is worth the ten minutes: if there's a mismatch between what you're about to declare and what these show, it's the kind of thing that gets your return flagged for a closer look later.
Choosing the right ITR form matters more than people expect
There isn't one universal ITR form. ITR-1 suits salaried individuals with straightforward income and no capital gains. ITR-2 covers salary plus capital gains or multiple properties. ITR-3 and ITR-4 apply to business and professional income, with different rules depending on whether you're using presumptive taxation. Filing under the wrong form is a common reason returns get treated as defective, requiring a correction and resubmission.
Filing isn't the last step, verification is
Submitting the form online isn't the end of the process. The return has to be verified, either electronically through Aadhaar OTP, net banking, or a few other methods, or by physically mailing a signed form to the department within the required window. An unverified return is treated as if it was never filed at all, which surprises a lot of first-timers who assume "submitted" means "done."
What to actually do with all this
Before you open the portal: gather Form 16 (if salaried), bank interest certificates, any capital gains statements, and check Form 26AS and AIS for anything you might have missed. Decide which regime you're filing under by running the numbers both ways if you have old-regime deductions to claim. Then pick the correct ITR form based on your income types. That preparation is most of the actual work, the form itself moves fast once you have it.
This article is educational and not personalised financial advice. Rules and forms referenced here reflect the position as of FY 2025-26; always confirm current details on the official Income Tax Department website before filing.