Advance Tax: Due Dates, Percentages, and Interest Explained

Freelancers, business owners, and anyone with a large capital gain or a fat interest payout tend to learn about advance tax the hard way: a Section 234B or 234C interest line item shows up when they finally file, on tax they assumed they could simply pay at year-end. Advance tax isn't optional for most people who owe a meaningful amount of tax beyond what's already been deducted at source. It's paid in instalments through the year it's earned, not afterward, and the due dates matter almost as much as the total amount.

Who Actually Has to Pay It

Advance tax applies to anyone, individual, freelancer, business, or company, whose estimated tax liability for the year, after subtracting TDS and TCS already credited, comes to ₹10,000 or more. That threshold catches more people than it sounds like it should: a salaried employee with a large rental income, a significant capital gain, or a side consulting income on top of their salary can easily cross it, even if their employer is deducting TDS correctly on the salary itself. The one meaningful exemption is for resident senior citizens, aged 60 or above at any point in the year, who don't have any income from business or profession. They can pay their entire tax as self-assessment tax when filing, without owing advance tax or the interest that comes with skipping it. Everyone else needs to estimate the year's income, work out the tax on it, subtract expected TDS or TCS, and pay the balance on schedule.

The Due Dates and How Much Is Due Each Time

For most taxpayers, advance tax is paid in four instalments, each a cumulative percentage of the year's total estimated tax liability rather than four equal quarters.

Each instalment is cumulative, so the September payment should bring your total paid so far up to 45% of the full year's estimate, not add another 45% on top of June's 15%. Because income, especially business income, freelance receipts, or a capital gain, rarely arrives in a neat, predictable stream, you're expected to re-estimate your total income at each due date using the best information available at that point, rather than sticking rigidly to a figure guessed back in June.

Presumptive Taxpayers Get a Simpler Rule

If you've opted for presumptive taxation under Section 44AD as a small business, or Section 44ADA as a professional such as a consultant, doctor, or freelance specialist below the eligibility threshold, you're spared the four-instalment schedule entirely. Instead, the full advance tax liability is payable in a single instalment on or before 15 March. This concession exists because presumptive taxpayers compute their income as a flat percentage of turnover or gross receipts rather than tracking actual profit through the year, which makes quarterly estimation genuinely harder to get right. The concession is specific to Sections 44AD and 44ADA. Presumptive taxation for goods carriages under Section 44AE doesn't get this single-instalment treatment and follows the regular quarterly schedule instead.

Section 234B: Paying Too Little Overall

Section 234B kicks in when your total advance tax paid by 31 March falls short of 90% of your assessed tax, meaning the actual tax finally worked out on your total income, less TDS and TCS credit. If you're under that 90% mark, interest is charged at 1% a month, simple interest, on the shortfall between your assessed tax and what you actually paid as advance tax, running from 1 April after the year ends until you pay the balance, whether that's through self-assessment tax at filing or a later assessment. It doesn't matter how the shortfall built up through the year. Section 234B only looks at the year-end position against that 90% threshold.

Section 234C: Paying the Right Amount at the Wrong Time

Section 234C is stricter than it looks, because it applies even if you end up paying 100% of your tax by 15 March. It charges interest for falling short of the cumulative percentage due at each individual instalment date, not just the year-end total. The law does build in a small buffer for the first two instalments: no interest applies for June if you've paid at least 12% of the tax due by then, or for September if you've paid at least 36%, even though the formal targets are 15% and 45%. December and March don't get that buffer. Falling short of 75% by mid-December or 100% by mid-March triggers interest at 1% a month on the shortfall, for three months on the June, September, and December shortfalls, and one month on the March shortfall. There's one genuine relief built in: if the shortfall in an earlier instalment is because of a capital gain, lottery winning, or similar income that only arose after that due date, no Section 234C interest applies to that specific instalment, provided the tax on it is paid by the next due date, or by 31 March if it arose in the January to March period itself.

Practical Habits That Avoid Most of the Interest

• Re-check your estimated income at each due date rather than only once in June. A bonus, a capital gain, or a new consulting assignment mid-year changes what's owed.
• Remember advance tax is calculated on the balance after expected TDS, not your gross income. Salaried taxpayers often overpay by forgetting to net this off, and self-employed taxpayers often underpay by forgetting TDS credit exists at all.
• If a capital gain or windfall arrives after an earlier due date has passed, pay the tax on it by the very next due date to use the Section 234C relief rather than waiting until March.
• Presumptive taxpayers under Section 44AD or 44ADA should still pay by 15 March itself. There's no relief for missing even the single instalment.
• Use the e-pay tax facility on the income tax portal, or Challan 280, for payment, and keep the payment confirmation, since it's your proof of the date paid.

Advance tax rewards taxpayers who treat their income as an ongoing estimate rather than a year-end surprise. None of the interest under Section 234B or 234C is large in any single month, but it compounds across quarters and years of the same habit, and it's entirely avoidable with a rough recalculation every few months rather than one guess made in June and never revisited.