Advance Tax Computation

Many people think income tax is something you settle once a year, when the return is filed. For a large group of taxpayers, that is not true. If your tax bill is going to be more than a small amount after TDS, the law expects you to pay it in instalments during the year, and interest can apply if you pay too little or too late. Getting the numbers right is what advance tax computation is all about. It is also why a quick check in the middle of the year, such as right now with the December instalment approaching, can save a lot of trouble in March.

This guide explains how advance tax computation works, who needs it, how the instalments are calculated, what changed with the new Income-tax Act, and where the limits lie. It is general information, not tax advice for any particular situation.

What Is Advance Tax Computation?

Advance tax computation is the process of estimating your total income tax for the year and working out how much of it must be paid in advance, instalment by instalment, before the year ends. It is often called pay-as-you-earn, because tax is paid in the same year in which the income arises instead of in one lump sum after the year closes.

A proper estimate looks at your expected income from all taxable sources, the tax rates and deductions that apply to you, the tax already deducted or collected at source (TDS and TCS), and any advance tax you have already paid. What is left is the amount you need to pay in advance.

What Changed With the New Income-tax Act?

The Income-tax Act, 2025 and the Income-tax Rules, 2026 apply to income arising on or after 1 April 2026, which is the “tax year 2026-27”. The old concepts of “financial year” and “assessment year” are being replaced by a single tax year, and the sections have been renumbered. Advance tax for the year that ended in March 2026 is still governed by the old Act.

For advance tax computation, the good news is that the core mechanics have stayed the same. The threshold, the four instalments, and the percentages continue as before. The interest provisions for non-payment and for shortfall in instalments, previously Sections 234B and 234C, now appear in Sections 424 and 425. Many articles and calculators still use the old section numbers, so check the date of whatever you rely on.

Who Needs Advance Tax Computation?

You generally need to pay advance tax if your estimated tax liability for the year, after TDS and TCS, is ₹10,000 or more. That includes:

• Business owners and companies, whose income is not subject to TDS in full.

• Freelancers and consultants, where TDS may cover only part of the tax.

• Salaried employees with other income, such as rent, interest, or capital gains that salary TDS does not cover.

• Investors, who earn taxable capital gains, dividends, or interest.

• Landlords, with taxable rental income.

• Self-employed professionals, such as doctors, designers, and consultants.

A resident senior citizen (aged 60 or above) who has no income from business or profession is generally exempt from advance tax. Other exceptions and special cases exist, so check your own circumstances.

For most salaried people with no other income, the employer’s TDS already covers the tax, and no advance tax is due. The question becomes relevant when you have income that no one is deducting tax from.

How Advance Tax Computation Works, Step by Step

Step 1: Estimate your income for the year. Add up what you expect from salary, business or profession, house property, capital gains, and other sources.

Step 2: Work out your taxable income. Subtract the deductions and exemptions available under the tax regime you are using. The old and new regimes have different rules, so the choice matters.

Step 3: Calculate the tax. Apply the relevant slab rates or special rates to your taxable income, and add surcharge and cess if they apply.

Step 4: Subtract credits. Deduct TDS, TCS, and any advance tax or self-assessment tax already paid.

Step 5: Check the threshold. If the balance is ₹10,000 or more, advance tax applies.

Step 6: Split into instalments. Pay the cumulative percentages by the due dates, less whatever you have already paid.

The Instalment Schedule

For most taxpayers, the schedule for tax year 2026-27 is:

The percentages are cumulative. Each instalment is the cumulative target minus what you have already paid. Taxpayers under the presumptive taxation schemes for small businesses and professionals can generally pay the whole amount in a single instalment by 15 March.

As of today, the 15 September instalment has passed and the next one, 75% cumulative, is due on 15 December 2026. If you have not yet checked whether your payments so far are on track, this is the time to do it.

A Worked Example

Suppose a freelance consultant estimates that their tax for the year, after TDS, is ₹1,20,000.

• By 15 June, the cumulative target is 15%, which is ₹18,000.

• By 15 September, the cumulative target is 45%, which is ₹54,000. If ₹18,000 was already paid, the additional payment is ₹36,000.

• By 15 December, the cumulative target is 75%, which is ₹90,000. If ₹54,000 was already paid, the additional payment is ₹36,000.

• By 15 March, the cumulative target is 100%, which is ₹1,20,000. If ₹90,000 was already paid, the final payment is ₹30,000.

This example assumes the estimate does not change. In real life, income often does, and then the later instalments should be adjusted.

What Happens if You Pay Late or Pay Too Little?

If advance tax is not paid, or the instalments fall short of what was required, interest can apply under the interest provisions mentioned above. The calculation depends on how large the shortfall is and for how long it lasted. There is also a tolerance rule: interest for the June and September instalments is generally not charged if you have paid at least 12% by 15 June and at least 36% by 15 September. Capital gains and similar income that arises later in the year can often be covered by paying in the remaining instalments after the income arises.

Interest is not a penalty in the sense of punishment, but it adds up. It is usually cheaper to estimate and pay in time than to correct it later.

How to Prepare Before You Compute

Before starting advance tax computation, spend a short time on these points:

• Gather last year’s return and Form 26AS or the annual information statement to see your income and TDS.

• Estimate this year’s income from each source, using actual figures to date plus reasonable projections.

• Decide which tax regime you plan to use and list the deductions you can claim.

• Download your TDS and TCS details so you do not double count credits.

• Keep challans or payment receipts for advance tax already paid.

• Check for one-off income, such as sale of shares or property, that may change the estimate.

• Note the next due date and how much cash you will need.

Common Mistakes to Avoid

People commonly ignore income that has no TDS, such as rent, interest, or crypto and capital gains. Others forget to subtract TDS and end up overpaying, or they compute from last year’s income and miss a big change this year. Paying in a single lump sum on the last date instead of by instalments can create interest even if the total is correct. Another mistake is using an outdated calculator that uses the wrong section numbers or the wrong regime. And many people do not revisit the estimate when income changes during the year.

Understanding the Limits

A calculator or a conversation can give you a well-reasoned estimate, but advance tax computation depends on assumptions about the future, such as your income, deductions, and which regime you choose. It does not replace your final return, and it does not decide whether you are eligible for a particular deduction or exemption. Rules, forms, and section numbers also change, as they did with the new Act. For complex situations such as business income with presumptive and non-presumptive parts, foreign income, or large capital gains, a chartered accountant should review the figures before you pay.

How Calling Daddy Can Help

Many people know that advance tax exists but are unsure whether it applies to them, how much to pay, or what happens if they get it wrong. Calling Daddy helps individuals and businesses understand their position on advance tax computation, organise their income and credit details, and plan their instalments around the due dates. We will always say clearly when a situation needs a qualified tax professional instead of general guidance.

Frequently Asked Questions

1. What is advance tax computation?
It is the process of estimating your annual tax and working out how much you must pay in advance instalments after subtracting TDS, TCS, and payments already made.

2. Who has to pay advance tax in India?
Generally, anyone whose estimated tax for the year after TDS and TCS is ₹10,000 or more, subject to exceptions such as resident senior citizens without business income.

3. Do salaried employees need to pay advance tax?
Only if they have additional taxable income, such as rent, interest, or capital gains, that leaves their total tax above the threshold after TDS.

4. How many instalments are there?
Four cumulative targets: 15 June, 15 September, 15 December, and 15 March. Presumptive taxpayers can generally pay once, by 15 March.

5. How do I work out how much to pay?
Estimate your income, calculate tax under your chosen regime, subtract TDS and TCS, check the ₹10,000 threshold, and divide the balance by the cumulative schedule.

6. Can I change my estimate during the year?
Yes. If your income changes, revise the estimate and adjust the remaining instalments.

7. What happens if I miss an instalment?
Interest can apply on the shortfall. Pay as soon as you can, because the interest runs for the period of the shortfall.

8. Can I get help with advance tax computation online?
Yes. You can get guidance on estimating income, listing credits, and planning instalments, and a chartered accountant can verify complex cases.

Final Thoughts on Advance Tax Computation

Advance tax is easier when you treat it as a small, regular check-in instead of a year-end surprise. A careful advance tax computation shows you what you owe, when you owe it, and how much cash to set aside, so that interest does not take you by surprise in March. If you are unsure where you stand ahead of the next instalment, reach out to Calling Daddy and take the first step with clarity.