Advance Tax Calculator & Due Dates FY 2026-27: How to Calculate and Pay Online

If you only think about advance tax once a year, in March, when the interest notice from the income tax department lands in your inbox, you are paying more than you need to. Advance tax is not an extra tax. It is the same tax you would pay anyway, just spread across four payments through the year instead of one lump sum at filing time. The taxpayers who get caught out are almost never the ones who owe a huge amount. They are the ones who did not realise they owed anything at all until the first instalment had already passed.

This guide walks through exactly who needs to pay advance tax for FY 2026-27, how to calculate it yourself with a full worked example, the four due dates that matter, and how to actually make the payment online. We have also covered the new section numbers under the Income Tax Act, 2025, since the interest provisions that used to sit under Sections 234B and 234C have moved, and the rates have not changed even though the references have.

What Is Advance Tax and Who Needs to Pay It

Advance tax is the pay as you earn principle applied to income tax. Instead of waiting until you file your return to settle the full year's tax bill, you estimate your liability as the year progresses and pay it in instalments. The obligation is governed by Sections 403 to 408 of the Income Tax Act, 2025 for Tax Year 2026-27 onward, replacing the old Sections 207 to 219.

You need to pay advance tax if your estimated tax liability for the year, after subtracting TDS and TCS already credited to you, comes to Rs 10,000 or more. This threshold has not changed under the new Act, and it catches more people than you might expect, including:

• Salaried employees with income beyond their salary, such as rental income, capital gains from shares or mutual funds, or interest income that their employer's TDS does not fully account for.
• Freelancers and consultants whose income is not routed through payroll TDS at all.
• Business owners, traders, and investors with income that fluctuates through the year.
• Landlords receiving rent that crosses the TDS threshold but where the deducted amount does not cover the full liability.

Resident senior citizens, aged 60 or above, who have no income from business or profession are exempt from advance tax entirely and can simply pay any balance as self-assessment tax at the time of filing.

Taxpayers under the presumptive taxation scheme, covered under Section 58 of the new Act (Sections 44AD and 44ADA under the old Act), get a simplified path. Instead of four instalments, they can pay 100 percent of their advance tax in a single payment by 15 March.

Advance Tax Due Dates for FY 2026-27

The instalment structure itself has not changed under the new Act, only the section numbers behind it. Here are the four dates that matter for Tax Year 2026-27:

These percentages are cumulative, not additive per quarter. By the second instalment, you should have paid 45 percent of the total in aggregate, not 45 percent on top of the 15 percent already paid. We have covered the 15 June deadline along with everything else due that month in our June 2026 compliance calendar, if you want the full picture of what else lands in the same window.

If you are a presumptive taxpayer under Section 58, you can skip the first three instalments entirely and pay the full 100 percent by 15 March 2027 instead.

How to Calculate Advance Tax, Step by Step

The calculation is the same logic your final tax return will use, just done early and with estimates instead of actuals. Five steps:

Step 1: Estimate your total income for the year.

Add up every source, salary, business or professional income, rental income, capital gains, interest, and anything else you expect to earn between 1 April 2026 and 31 March 2027.

Step 2: Subtract eligible deductions.

This depends on which regime you choose. The new tax regime, which remains the default, allows a standard deduction of Rs 75,000 for salaried taxpayers and very few other deductions. The old regime allows a wider set, including Section 80C, HRA, and home loan interest, but at higher slab rates. If you have not settled which regime suits you better, our old vs new tax regime comparison walks through both side by side.

Step 3: Compute tax on the resulting taxable income.

Under the new regime for FY 2026-27, the slabs are unchanged from FY 2025-26: nil up to Rs 4 lakh, 5 percent from Rs 4 to 8 lakh, 10 percent from Rs 8 to 12 lakh, 15 percent from Rs 12 to 16 lakh, 20 percent from Rs 16 to 20 lakh, 25 percent from Rs 20 to 24 lakh, and 30 percent above that. A rebate under Section 87A brings the effective tax to zero for taxable income up to Rs 12 lakh, but this rebate does not apply once you are above that threshold, even by a small amount, so do not assume it will soften a borderline case.

Step 4: Add surcharge and cess where applicable.

A 4 percent health and education cess applies to everyone. Surcharge kicks in only at higher income levels, 10 percent above Rs 50 lakh, 15 percent above Rs 1 crore, rising further at higher thresholds, capped at 25 percent under the new regime.

Step 5: Subtract TDS and TCS already credited or expected for the year.

What remains is your advance tax liability. Apply the 15/45/75/100 percent cumulative schedule to that remaining figure, not to your gross tax liability.

A Full Worked Example

Numbers make this easier to follow than rules alone, so here is a complete example using a fairly common situation: a salaried professional with a meaningful side income.

Ananya works full time as a marketing manager and also earns freelance income from content writing on the side. For FY 2026-27, she expects:

Salary income (gross): Rs 15,00,000 Freelance income (net of expenses): Rs 5,00,000 Total gross income: Rs 20,00,000

She opts for the new tax regime. Her standard deduction of Rs 75,000 applies only against her salary income, bringing her taxable income to Rs 19,25,000.

Tax on Rs 19,25,000 under the new regime slabs works out as follows: nil on the first Rs 4 lakh, 5 percent on the next Rs 4 lakh (Rs 20,000), 10 percent on the next Rs 4 lakh (Rs 40,000), 15 percent on the next Rs 4 lakh (Rs 60,000), and 20 percent on the remaining Rs 3.25 lakh (Rs 65,000). That totals Rs 1,85,000 before cess. Adding 4 percent cess (Rs 7,400) brings her total tax liability to approximately Rs 1,92,400.

Her employer, computing TDS only on her salary income since they have no visibility into her freelance earnings, deducts tax based on a taxable salary of Rs 14,25,000 (Rs 15,00,000 minus the Rs 75,000 standard deduction). That works out to roughly Rs 97,500 in TDS for the year, deducted gradually through her salary.

Ananya's advance tax liability is the difference: Rs 1,92,400 minus Rs 97,500, which comes to Rs 94,900. Since this comfortably exceeds the Rs 10,000 threshold, she needs to pay advance tax on this balance.

Applying the cumulative schedule to Rs 94,900:

By 15 June 2026, she should have paid 15 percent, or Rs 14,235. By 15 September 2026, a cumulative 45 percent, or Rs 42,705, meaning an additional Rs 28,470 on top of what she paid in June. By 15 December 2026, a cumulative 75 percent, or Rs 71,175, another Rs 28,470. By 15 March 2027, the full Rs 94,900, a final Rs 23,725.

This is exactly the kind of calculation that is easy to get approximately right and genuinely wrong in the details, particularly once multiple income sources and TDS at different rates are involved. CompuTax runs this calculation automatically from your computation data and tells you the exact instalment amount due on each date, which removes the guesswork from a number that interest penalties are calculated against.

How to Pay Advance Tax Online

Paying advance tax takes a few minutes once you know your instalment amount.

Go to the income tax e-filing portal and select the e-Pay Tax option. Log in using your PAN.

Select the correct Tax Year, 2026-27, and the payment type as Advance Tax. This step matters more than it used to. The portal now distinguishes between Tax Year and the older Assessment Year terminology, and selecting the wrong one can misapply your payment.

Enter the instalment amount you have calculated and choose a payment method, net banking, debit card, UPI, or NEFT/RTGS are all supported.

Complete the payment and download the challan. Save the CIN, BSR code, and challan serial number that appear on it. You will need these details when you file your return, to claim credit for the advance tax you have already paid.

What Happens If You Miss a Due Date or Underpay

Two separate interest provisions can apply, and they cover different situations.

If your total advance tax paid by the end of the year is less than 90 percent of your assessed tax, interest applies under Section 424 of the new Act (Section 234B under the old Act) at 1 percent per month, calculated from 1 April following the end of the tax year until the date you actually pay.

If you pay less than the required cumulative percentage at any individual instalment date, interest applies under Section 425 (Section 234C under the old Act), also at 1 percent per month, specifically on the shortfall at that instalment.

There is a useful relief built into Section 425 that most people are not aware of: if you have paid at least 12 percent of your liability by the first instalment and at least 36 percent cumulatively by the second, you generally avoid interest for those two instalments even if your originally estimated figures turn out to be slightly conservative. This gives you a small buffer rather than demanding the exact percentage to the rupee.

There is also a separate relief for income that genuinely could not have been foreseen earlier in the year, capital gains, lottery or other casual income, and dividend income other than deemed dividend. If this kind of income arises after an earlier instalment date has already passed, you are not penalised for not having paid advance tax on it at that earlier date, provided you pay the tax due on it by the immediately following instalment.

Common Mistakes to Avoid

• Forgetting income that does not have TDS deducted against it at all, particularly freelance income, capital gains, and interest from sources other than your primary bank.
• Applying the instalment percentage to your gross tax liability instead of to the balance remaining after TDS and TCS.
• Selecting the wrong Tax Year on the payment portal, which can result in the payment not being correctly credited against the year you intended.
• Assuming the Section 87A rebate applies once your taxable income edges past Rs 12 lakh. It does not, and the cliff effect here is sharper than people expect.
• Treating the first instalment as optional because it is "only 15 percent." Skipping it still attracts Section 425 interest on the shortfall, even if you pay the rest on schedule afterward.

Frequently Asked Questions

Do I need to pay advance tax if all my income already has TDS deducted?

Only if the TDS deducted falls short of your actual total liability by Rs 10,000 or more. Many salaried taxpayers with only salary income never owe advance tax because employer TDS already covers the full liability. The moment you add freelance income, capital gains, or rental income, that assumption often breaks.

What if my income estimate changes during the year?

Recalculate and adjust your remaining instalments accordingly. Advance tax is based on an estimate, and the law expects that estimate to be updated as your actual income picture becomes clearer, not locked in from the first instalment.

Can I pay all four instalments together in March if I forgot the earlier ones?

You can, but you will still owe Section 425 interest on the missed earlier instalments, calculated for the period they were overdue. Paying late is always better than not paying at all, but it does not erase the interest already accrued.

Is the advance tax calculation different under the old tax regime?

The steps are identical. Only the deductions you can claim and the slab rates differ, which changes your taxable income and tax liability, but not the instalment structure or due dates.

Where do I find my advance tax payments when filing my return?

They appear in your Form 26AS (now Form 168 under the new numbering) and in the Annual Information Statement on the e-filing portal, both of which you should reconcile against your own challan records before filing.

Getting advance tax right is mostly about not letting income without TDS slip past you unnoticed. If you are tracking multiple income sources, multiple TDS rates, and four separate due dates by hand, this is exactly the kind of calculation CompuTax is built to handle for you, instalment by instalment, so March never arrives with a surprise attached.

Disclaimer

This article is for informational purposes only. Compliance requirements, due dates, and regulatory provisions are subject to change based on government notifications. Please verify all deadlines and filing requirements on the relevant official portals before acting.