Advance Tax September 2026: 15 September Due Date, 45% Rule & Calculation
Published: September 10, 2026
Last Updated: September 10, 2026
Advance Tax September 2026: Quick Answer
Advance Tax September 2026 is due on 15 September 2026 for the second regular instalment. By this date, cumulative advance tax should generally reach 45% of the estimated advance-tax liability, after reducing the amount already paid in earlier instalments.
If you are searching for Advance Tax September 2026, the most important date to remember is 15 September 2026. It is the second instalment deadline for taxpayers following the regular advance-tax payment schedule for Tax Year 2026–27.
By this date, the cumulative advance tax paid should generally reach 45% of the estimated advance-tax liability. The key point is that 45% is a cumulative target, not an additional 45% payment.
For example, if your estimated advance-tax liability is ₹1,00,000 and you already paid ₹15,000 in June, you need to bring your total advance-tax payment to ₹45,000 by 15 September. Therefore, the September payment would be ₹30,000.
This guide explains the 15 September 2026 due date, 45% rule, eligibility, calculation, payment process, interest implications, and common mistakes in simple terms.
Quick Answer: What Is the Advance Tax Due Date in September 2026?
The second advance-tax instalment is due on 15 September 2026.
For taxpayers following the regular instalment system, cumulative advance tax should generally be:
These percentages are cumulative. So, the September payment is only the amount required to take your total payment to 45%, after considering earlier advance-tax payments.
Key Takeaways
15 September 2026 is the second regular advance-tax instalment deadline.
The September target is 45% cumulatively.
You do not pay another 45% if you have already paid the June instalment.
Advance tax generally applies when the estimated tax payable is ₹10,000 or more, subject to applicable exceptions.
Advance tax for income of Tax Year 2026–27 is governed by the Income Tax Act, 2025.
Taxpayers using the applicable presumptive taxation provisions generally pay the entire advance tax by 15 March instead of using four regular instalments.
What Is Advance Tax?
Advance tax is income tax paid during the tax year instead of paying the entire tax liability at the end of the year.
It is commonly relevant when tax is not fully covered through TDS or TCS.
For example, a freelancer may receive payments from several clients. Some clients may deduct TDS, but the total TDS may not cover the freelancer's eventual tax liability. In such a case, the taxpayer may need to pay the remaining liability through advance tax.
Similarly, business owners, professionals, consultants and individuals with income from investments or other sources may need to estimate their yearly tax and pay advance tax in instalments.
The Income Tax Department states that the basic framework for advance-tax payment continues under the Income Tax Act, 2025, with the new Act providing a formula for computing advance-tax liability under Section 405.
Who Needs to Pay Advance Tax in 2026?
Generally, a taxpayer is liable to pay advance tax when the tax payable for the year is ₹10,000 or more, after considering the applicable computation and tax credits.
However, there are exceptions.
For example, a resident senior citizen aged 60 years or above who does not have income from business or profession is generally not liable to pay advance tax.
Advance tax can be relevant for:
Freelancers
Consultants
Doctors, lawyers and other professionals
Business owners
Partnership firms
Individuals with substantial investment income
Taxpayers earning capital gains
Individuals with multiple income sources
Taxpayers whose TDS/TCS does not cover their final tax liability
Who Should Pay Special Attention Before 15 September?
If your income has increased since June, do not simply repeat your earlier estimate.
Review your expected:
Business or professional income
Salary and other income
Interest income
Capital gains
TDS/TCS credits
Deductions or eligible tax benefits
Advance tax already paid
A revised estimate can help you determine whether additional payment is required in September.
What Is the 45% Advance Tax Rule for September 2026?
The 45% advance-tax rule means that by 15 September, your cumulative advance-tax payment should generally be at least 45% of the advance tax payable for the year.
It does not mean that you must pay 45% again in September.
According to the Income Tax Department, the second advance-tax instalment for individuals is 45% of the tax liability, after reducing advance tax already paid, and is payable on or before 15 September. This confirms that the 45% September requirement is a cumulative target, rather than an additional 45% payment.
Example 1: ₹1 Lakh Advance-Tax Liability
Suppose your estimated advance-tax liability for Tax Year 2026–27 is:
₹1,00,000
Your payment schedule would broadly be:
So, by 15 September 2026, your total payment should reach ₹45,000.
Example 2: ₹2 Lakh Advance-Tax Liability
Suppose your estimated annual advance-tax liability is ₹2,00,000.
The September cumulative target is:
45% × ₹2,00,000 = ₹90,000
If you already paid ₹30,000 in June:
September payment = ₹90,000 − ₹30,000 = ₹60,000
Therefore, you need to pay approximately ₹60,000 in September to reach the 45% cumulative target, assuming your estimate and credits remain unchanged.
How to Calculate Advance Tax for September 2026
Advance-tax calculation should be based on your expected tax liability for the entire tax year, rather than simply looking at one month's income.
A practical approach is:
Step 1: Estimate Your Annual Income
Add your expected taxable income from relevant sources.
This may include:
Salary
Business income
Professional income
Interest
Capital gains
Rental income
Other taxable income
Step 2: Calculate the Estimated Tax
Apply the applicable tax provisions to your estimated taxable income.
The Income Tax Department confirms that Section 405 of the Income Tax Act, 2025 provides a formula for the computation of advance-tax liability.
Step 3: Consider TDS and TCS
Do not calculate advance tax as though no tax has already been paid.
Consider applicable:
TDS
TCS
Tax already paid as advance tax
Other eligible tax credits
Step 4: Check Your June Payment
Find out how much advance tax you already paid by 15 June.
Then calculate the amount required to reach the 45% cumulative target.
Step 5: Pay the Balance
If the estimated liability has not changed, pay enough to bring your cumulative advance tax to the applicable September target.
Advance Tax Calculation Example for a Freelancer
Suppose a freelancer estimates the following for Tax Year 2026–27:
Estimated tax liability: ₹1,50,000
TDS expected: ₹30,000
The remaining advance-tax liability would need to be determined after considering applicable credits and the relevant tax computation.
If the resulting advance-tax liability is ₹1,20,000:
45% = ₹54,000
If ₹18,000 has already been paid in June:
September amount = ₹54,000 − ₹18,000 = ₹36,000
This is why freelancers should not calculate the September instalment simply by taking 45% of their gross income.
The calculation should be based on the estimated tax liability, after considering relevant tax credits.
Advance Tax for Business Owners
Business owners often have variable income, so their September calculation may need more attention.
For example, a business may have:
Higher sales than expected
Increased profit margins
New clients
Additional professional receipts
Interest income
Capital gains
Lower TDS than expected
If your income estimate changes, your advance-tax calculation may also change.
The Income Tax Department's guidance confirms that advance tax is based on expected tax liability for the year.
Therefore, business owners should review their accounts before making the September payment rather than blindly following the previous instalment.
Advance Tax for Freelancers and Professionals
Freelancers and professionals should pay particular attention to advance tax because their income may not have a fixed monthly structure.
For example, a freelancer could receive ₹80,000 in one month and ₹2,00,000 in another month. TDS may also vary between clients.
Therefore, before 15 September, review:
Total receipts so far
Expected receipts for the rest of the year
Business expenses
TDS/TCS credits
Tax already paid
Expected final tax liability
This gives you a more realistic basis for estimating advance tax.
What Happens If You Miss the 15 September 2026 Deadline?
Missing or underpaying an advance-tax instalment can have interest consequences, depending on the nature and extent of the shortfall.
Under the Income Tax Act, 2025, interest relating to advance-tax default and deferment is covered under Sections 424 and 425. The Income Tax Department states that the applicable interest rates remain unchanged from the earlier framework.
The important point is that taxpayers should not assume that missing an instalment has no consequence simply because the final ITR is filed later.
If your advance-tax position has changed, it is better to review the calculation and make the required payment rather than wait until ITR filing.
Advance Tax vs TDS: What Is the Difference?
These two terms are often confused.
For example, your client may deduct TDS from your professional payment. That TDS can reduce your remaining tax liability.
However, if the TDS does not cover your overall tax liability, advance tax may still be payable.
Advance Tax vs Self-Assessment Tax
Advance tax is generally paid during the tax year based on estimated tax liability.
Self-assessment tax is generally paid after calculating the final tax liability while filing the income-tax return.
So, if you are liable for advance tax, waiting until ITR filing and paying everything as self-assessment tax may create avoidable interest implications.
How to Pay Advance Tax Online in 2026
For Tax Year 2026–27, taxpayers should use the applicable payment process under the Income Tax Act, 2025.
A practical process is:
Estimate your tax liability.
Consider TDS/TCS and taxes already paid.
Calculate the advance-tax amount due.
Open the official Income Tax e-Filing tax-payment facility.
Select the applicable Tax Year 2026–27.
Select the relevant tax-payment option.
Enter the required details.
Complete the payment through an authorised electronic payment method.
Save the payment acknowledgement/challan for your records.
The Income Tax Department confirms that advance tax for Tax Year 2026–27 is governed by the Income Tax Act, 2025. Taxpayers making advance-tax payments for this tax year should select Tax Year 2026–27 while making the payment. Official Income Tax Department – Tax Payments FAQ
Common Advance Tax Mistakes to Avoid
1. Thinking September Means Another 45%
This is the most common misunderstanding.
The September requirement is generally 45% cumulatively, not an additional 45%.
2. Ignoring TDS
If TDS has already been deducted, it should be considered while working out the remaining tax liability.
3. Using the Wrong Tax Year
For income earned during April 2026 to March 2027, the applicable period is Tax Year 2026–27 under the Income Tax Act, 2025.
4. Copying Last Year's Tax Calculation
Your income, TDS, investments, and business profits may have changed.
Your advance-tax estimate should therefore be reviewed rather than copied blindly.
5. Waiting Until ITR Filing
Advance tax is designed to distribute tax payments during the year. Delaying the entire payment until return filing can create interest exposure where the applicable conditions are met.
6. Forgetting Capital Gains or Other Income
A large capital gain, interest income, or other taxable receipt can change your estimated tax liability.
When Should You Take Professional Tax Help?
You may want professional assistance if your tax calculation involves:
Business or professional income
Multiple income sources
Capital gains
Significant TDS/TCS
Changing annual income
Previous advance-tax payments
Complex deductions or tax calculations
Potential interest for short payment
Tax compliance for a business or firm
For taxpayers in Dehradun, TaxAbide provides income-tax and tax-compliance assistance for individuals, professionals, and businesses.
Learn more about TaxAbide and our tax and compliance services on our About Us page.
You can also read TaxAbide's detailed guide on Income Tax Consultant in Dehradun: Services, Fees & How to Choose in 2026 for guidance on selecting professional tax support.
Advance Tax September 2026: Final Takeaway
The 15 September 2026 advance-tax deadline is important for taxpayers who are liable to pay advance tax for Tax Year 2026–27.
For taxpayers following the regular instalment schedule, the cumulative target by September is 45% of the estimated advance-tax liability. If you have already paid the June instalment, only the amount required to reach the applicable cumulative target needs to be considered.
Before making the payment, review your estimated income, TDS/TCS, previous advance-tax payments, and expected tax liability.
If your income has changed significantly during the year, update your calculation instead of relying on an old estimate.
For professional assistance, you can contact TaxAbide for tax and compliance support in Dehradun and across India.
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