A business may start the financial year with moderate sales and estimated profits, but the situation can change quickly. A large order, new customers, improved sales margins, reduced operating expenses, or an unexpected increase in revenue can push annual profits much higher than originally expected.
When business profit increases, the income tax liability may also increase. If you continue paying advance tax based on your earlier estimate, you may end up with a shortfall and interest liability.
The solution is to revise your estimated annual income and adjust the remaining advance tax installments. You do not have to wait until the end of the financial year to correct your estimate.
Quick Answer
If your business profit increases during the year, recalculate your expected annual taxable income and the corresponding tax liability. Deduct eligible TDS/TCS and advance tax already paid to determine the remaining amount payable.
For the tax year 2026–27, taxpayers generally pay advance tax in four installments:
- 15% by 15 June
- 45% cumulatively by 15 September
- 75% cumulatively by 15 December
- 100% by 15 March
If your revised tax estimate is higher, you can increase the amount paid in the remaining installments to cover the additional liability.
Why Can Business Profit Increase During the Financial Year?
Business income is not always predictable at the beginning of the year. Several developments can increase the final taxable profit.
1. Higher Sales Than Expected
A business may receive additional orders, expand its customer base or experience seasonal demand. If sales increase faster than expenses, annual profits may be higher than projected.
2. New Contracts or Large Orders
A large contract can significantly improve business revenue. However, the business should also account for the related production, labour, delivery, and other expenses before estimating the additional taxable profit.
3. Reduction in Business Expenses
If rent, salaries, transportation, raw material costs or other operating expenses decrease, the business may retain a higher proportion of its revenue as profit.
4. Additional Income From Other Sources
Interest income, rental income, capital gains, and other taxable receipts may increase the overall tax liability. These should also be considered while estimating the year’s total taxable income.
When Should a Business Recalculate Advance Tax?
You should review your advance tax estimate whenever there is a material change in expected annual income or tax liability.
For example, consider recalculating advance tax when:
- Actual profits are significantly higher than the original business projection.
- A major order or contract increases expected revenue.
- Operating expenses are lower than budgeted.
- Additional taxable income is received.
- TDS or TCS credits are different from your earlier estimate.
- Your earlier tax calculation no longer reflects the business’s financial position.
A practical approach is to review the profit and loss statement, sales, expenses, and tax estimate at least before each advance tax installment.
How to Recalculate Advance Tax When Business Profit Increases
Follow these steps to estimate the revised advance tax liability.
Step 1: Estimate Your Total Annual Business Profit
Start with the actual financial performance of the business and estimate the remaining months.
For example:
- Actual profit earned so far: ₹18,00,000
- Estimated profit for the remaining period: ₹12,00,000
- Revised estimated annual business profit: ₹30,00,000
This is an illustrative estimate. Your taxable business income may differ from accounting profit because of tax adjustments, disallowances, depreciation, and eligible deductions.
Step 2: Calculate Your Estimated Total Taxable Income
Do not calculate advance tax only on the basis of sales or accounting profit. Consider all relevant income sources and tax adjustments.
Your estimate should account for:
- Business or professional income
- Other taxable income
- Eligible deductions and exemptions, where applicable
- Depreciation and tax-specific adjustments
- Applicable tax regime and tax rates
- Eligible tax reliefs and credits
The final estimate should represent your expected taxable income for the entire tax year.
Step 3: Calculate the Revised Tax Liability
Calculate the income tax on your revised estimated taxable income using the applicable provisions and rates for the relevant tax year.
Then deduct eligible amounts such as:
- TDS and TCS expected to be credited
- Advance tax already paid
- Eligible tax reliefs and credits
The balance is the estimated advance tax liability to be discharged.
Step 4: Deduct Advance Tax Already Paid
Check your previous advance tax challans and calculate the total amount already deposited.
Do not pay the entire revised liability again. The amount already paid must be adjusted against the revised cumulative advance tax requirement.
Step 5: Pay the Revised Shortfall in the Remaining Instalments
If the revised estimate is higher, increase the amount payable in the remaining instalments.
Under Section 406(2) of the Income-tax Act, 2025, a taxpayer who has already paid one or more advance tax instalments may increase or reduce the amount payable in the remaining instalments to match the revised estimate.
Example: Business Profit Increased From ₹20 Lakh to ₹30 Lakh
Suppose a business initially estimated its annual taxable income at ₹20 lakh. Due to higher sales and improved margins, the revised estimate increases to ₹30 lakh.
Assume the following figures solely to demonstrate the adjustment:
| Particulars | Amount |
| Original estimated taxable income | ₹20,00,000 |
| Revised estimated taxable income | ₹30,00,000 |
| Original estimated advance tax liability | ₹4,00,000 |
| Revised estimated advance tax liability | ₹6,00,000 |
| Advance tax already paid | ₹2,40,000 |
For this illustration, assume ₹6 lakh is the revised advance tax liability after considering applicable tax credits and other adjustments.
By 15 December, a taxpayer under the regular instalment schedule should have paid at least 75% of the revised advance tax liability.
Calculation:
75% of ₹6,00,000 = ₹4,50,000
Advance tax already paid = ₹2,40,000
Additional amount required by 15 December = ₹2,10,000
The taxpayer should therefore pay ₹2,10,000 by 15 December to meet the 75% cumulative requirement, assuming no other advance tax payments have been made.
The remaining ₹1,50,000 would be payable by 15 March.
This example is illustrative. The actual tax liability depends on the taxpayer’s legal status, applicable tax rates, taxable income, credits and payment history.
Advance Tax Due Dates for Tax Year 2026–27
For taxpayers following the regular advance tax instalment schedule, Section 408 of the Income-tax Act, 2025 prescribes the following cumulative payment requirements:
| Instalment | Due date | Cumulative tax payable |
| First | 15 June 2026 | 15% |
| Second | 15 September 2026 | 45% |
| Third | 15 December 2026 | 75% |
| Fourth | 15 March 2027 | 100% |
The percentages are cumulative, not additional percentages. For example, the September instalment is the amount needed to bring total advance tax paid to 45%, after adjusting the June payment.
Important: Eligible taxpayers declaring income under the presumptive taxation provisions covered by Section 58(2) generally pay the entire advance tax liability in one instalment by 15 March.
What Happens If You Do Not Increase Advance Tax After Profits Rise?
If your final tax liability is significantly higher than the advance tax paid, interest may become payable.
For Tax Year 2026–27, the Income-tax Act, 2025 contains the relevant provisions:
Interest Under Section 425 – Deferment of Advance Tax
Interest may apply when the required advance tax instalments are not paid within the prescribed dates or are paid below the applicable thresholds.
The interest rate and calculation period depend on the instalment and the amount of shortfall. The general rate is 1% per month or part of a month for the applicable period.
Interest Under Section 424 – Default in Payment of Advance Tax
If advance tax paid is less than 90% of the assessed tax, interest may generally apply at 1% per month or part of a month on the applicable shortfall, subject to the statutory calculation.
These provisions correspond broadly to Sections 234C and 234B of the earlier Income-tax Act, 1961.
Can You Adjust Advance Tax If Your Profit Increases After September?
Yes. You can revise your estimate and pay a higher amount in the remaining instalments.
For example, if your business profit increases in November, you can recalculate the annual tax liability and pay the amount needed to meet the 75% cumulative requirement by 15 December.
If the increase occurs after December, recalculate the liability again and pay the remaining amount by 15 March.
Do not assume that an increase in profit automatically changes an earlier instalment’s due date. The applicable interest provisions should be checked based on the actual timing and amount of the shortfall.
Common Mistakes Businesses Should Avoid
- Calculating advance tax using turnover instead of estimated taxable income.
- Continuing with an outdated profit estimate despite a major increase in business income.
- Forgetting to account for TDS and TCS credits.
- Paying the revised total liability without deducting advance tax already deposited.
- Ignoring income from sources other than the main business.
- Confusing cumulative instalment percentages with additional percentages.
- Waiting until ITR filing to identify an advance tax shortfall.
How Sharda Associates Helps Businesses Recalculate Advance Tax
A sudden increase in business profit can make the original tax estimate inaccurate. Sharda Associates helps business owners review their financial performance and estimate their tax liability using updated figures.
Our assistance can include:
- Reviewing sales, expenses, and estimated annual profitability.
- Preparing an updated taxable income estimate.
- Checking applicable tax rates, deductions, and adjustments.
- Reconciling advance tax payments with TDS and TCS credits.
- Calculating the amount payable in the remaining installments.
- Reviewing potential interest exposure due to advance tax shortfalls.
With a timely review, businesses can make better tax-payment decisions and avoid relying on outdated financial estimates.
Conclusion
An increase in business profit is a positive development, but it can also increase your income tax liability. If your original advance tax estimate no longer reflects your expected annual income, recalculate it before the next instalment due date.
Review your revised taxable income, deduct eligible tax credits and advance tax already paid, and adjust the remaining instalments accordingly. Regular monitoring of business profitability can help prevent unexpected tax payments and interest liabilities at the end of the year.
For professional assistance with advance tax calculations and business tax planning, contact Sharda Associates.
Frequently Asked Questions
1. What should I do if my business profit increases during the financial year?
Recalculate your estimated annual taxable income and tax liability. Deduct TDS, TCS and advance tax already paid, then adjust the remaining instalments to meet the revised advance tax requirement.
2. Can I revise my advance tax estimate after September?
Yes. You can revise your estimate when business income changes and increase or reduce the remaining instalments accordingly.
3. What is the advance tax payment deadline for December 2026?
For taxpayers following the regular instalment schedule, the third advance tax instalment for Tax Year 2026–27 is due by 15 December 2026. Cumulative advance tax paid should generally reach at least 75% of the estimated liability.
4. Is advance tax calculated on turnover or net profit?
Advance tax is calculated on estimated taxable income, not simply on turnover. Business expenses, tax adjustments, deductions and other taxable income must also be considered.
5. What happens if I pay less advance tax than required?
Interest may apply under Section 425 for deferment of instalments and Section 424 where the advance tax paid is less than 90% of assessed tax, subject to the applicable conditions.
6. Can I adjust advance tax already paid against a revised tax liability?
Yes. Advance tax already paid is adjusted against the revised cumulative requirement. You should not pay the full revised liability again.
7. Do businesses under the presumptive taxation scheme have to pay advance tax quarterly?
Eligible taxpayers covered by Section 58(2) generally pay their entire advance tax liability by 15 March of the relevant financial year.
8. Why should a business review advance tax before every instalment?
Business income, expenses and tax credits can change during the year. Reviewing the estimate before each instalment helps identify shortfalls early and allows the business to adjust payments within the remaining instalment schedule.