ITR Computation AY 2026-27: Format, Calculation, Example & Software Workflow for CAs

Preparing an income tax return starts long before figures are entered into an ITR form. The first real step is preparing an accurate ITR computation.

For AY 2026-27, the computation brings together income from different sources, eligible deductions, applicable tax rates, TDS, TCS and taxes already paid to determine the taxpayer's final tax payable or refund.

For a Chartered Accountant handling hundreds of clients, this becomes more complicated because every taxpayer may have a different combination of salary, business income, capital gains, house property, investments, losses and tax credits.

This guide explains the ITR computation format for AY 2026-27, how tax is calculated, a practical example and how CAs can make the entire computation-to-filing workflow more efficient.

What Is ITR Computation?

An ITR computation, also called an income tax computation or computation of income, is a working statement showing how a taxpayer's total income and final income tax liability have been calculated.

It typically starts with income under the applicable heads and ends with the amount of tax payable or refund due after adjusting available tax credits.

An ITR computation is not a separate income tax return form. It is the calculation behind the return and helps taxpayers and tax professionals verify the figures before filing.

For AY 2026-27, income earned during FY 2025-26 is being reported, and the return continues to be governed by the Income-tax Act, 1961.

Basic ITR Computation Format for AY 2026-27

A practical income tax computation can follow this structure:

The actual computation may contain additional schedules for capital gains, depreciation, business income, losses or special-rate income depending on the taxpayer.

How to Calculate Income Tax for AY 2026-27

Step 1: Calculate Income Under Each Head

Begin by identifying all sources of income and placing them under the correct heads:

• Salary;
• House Property;
• Business or Profession;
• Capital Gains; and
• Other Sources.

For business taxpayers, start with the financial accounts and make the required tax adjustments rather than simply treating accounting profit as taxable business income.

Step 2: Adjust Eligible Losses

Review current-year and brought-forward losses and apply the applicable set-off and carry-forward provisions. Different types of losses have different restrictions, so they should not be adjusted mechanically.

Step 3: Arrive at Gross Total Income

Add the taxable income under the applicable heads after considering permitted adjustments and loss set-offs.

Step 4: Apply Eligible Deductions

Deduct the Chapter VI-A deductions available under the taxpayer's selected tax regime.

The old and new regimes allow different deductions and exemptions. Therefore, the regime should be confirmed before the final computation is completed.

For a detailed comparison, see CompuTax's Old vs New Tax Regime guide.

Step 5: Calculate Income Tax

Apply the applicable slab rates and separately calculate tax on income taxable at special rates, such as certain capital gains, where relevant.

Under the new tax regime for AY 2026-27, the general individual slab structure starts with nil tax up to ₹4 lakh, followed by progressive rates of 5%, 10%, 15%, 20%, 25% and 30%.

Eligible resident individuals under the new regime may also receive rebate under Section 87A, subject to the prescribed total-income and other conditions.

Step 6: Add Cess and Adjust Tax Credits

After computing tax and applicable rebate or surcharge, add Health and Education Cess.

Then adjust TDS, TCS, advance tax and other eligible tax credits to determine the final amount payable or refundable.

ITR Computation Example for AY 2026-27

Consider a simple example of an individual consultant using the new tax regime. Assume there is no income taxable at a special rate.

Under the new regime:

• Up to ₹4,00,000: Nil
• ₹4,00,001 to ₹8,00,000 at 5%: ₹20,000
• ₹8,00,001 to ₹12,00,000 at 10%: ₹40,000
• ₹12,00,001 to ₹14,00,000 at 15%: ₹30,000

Income Tax = ₹90,000

Health and Education Cess at 4% = ₹3,600

Total Tax Liability = ₹93,600

Now assume:

• TDS available: ₹70,000
• Advance Tax paid: ₹15,000

Total taxes already paid = ₹85,000.

Balance Self-Assessment Tax Payable = ₹8,600

This is a simplified illustration. An actual computation may change because of deductions, losses, capital gains, surcharge, rebate eligibility and other provisions.

Always Reconcile AIS and Form 26AS Before Finalising Computation

A technically correct calculation can still produce an incorrect return if the underlying income or tax-credit information is incomplete.

Before finalising the computation, CAs should reconcile the client's books and records with:

• Annual Information Statement (AIS);
• Taxpayer Information Summary (TIS);
• Form 26AS;
• TDS certificates;
• bank statements; and
• other relevant financial records.

This helps identify missing interest income, securities transactions, TDS differences or other information already reported to the Income Tax Department.

See CompuTax's detailed guide on how to use AIS to cross-check an ITR before filing.

Common ITR Computation Mistakes

• Using the wrong assessment year or tax regime.
• Missing income appearing in AIS or Form 26AS.
• Claiming deductions not available under the selected regime.
• Incorrectly adjusting brought-forward losses.
• Applying normal slab rates to income taxable at special rates.
• Missing TDS or advance tax already paid.
• Using accounting profit directly as taxable business income.
• Preparing the computation without checking the correct ITR form.

If the return form itself is unclear, use CompuTax's ITR Form Selection Guide for AY 2026-27.

ITR Computation Workflow for CA Firms

For a CA working on one return, a spreadsheet may appear manageable. The problem starts when the same process must be repeated across hundreds of clients.

A more structured workflow is:

Client Data → Books & Financials → AIS/26AS Reconciliation → Income Computation → Old vs New Regime Comparison → Tax Calculation → Validation → ITR Preparation → Filing & E-Verification

The biggest efficiency gain comes from avoiding repeated manual entry between these stages.

How CompuTax Simplifies ITR Computation for CAs

CompuTax Professional Income Tax Software is designed for Chartered Accountants, tax professionals, businesses and users managing income tax computation and return filing.

The software supports workflows such as:

• income and tax computation;
• ITR preparation and e-filing;
• old and new tax regime comparison;
• Form 26AS data import;
• set-off and carry-forward of losses;
• tax validation and error identification; and
• management of multiple taxpayers from a professional workflow.

For CA firms, this reduces the need to maintain separate computation sheets and repeatedly transfer the same figures between calculation and return-preparation systems.

Firms handling ITR, GST and TDS for many clients can also read CompuTax's guide to managing multiple client compliance workflows.

Frequently Asked Questions

What is ITR computation?

ITR computation is a statement showing how total taxable income, tax liability, tax credits and the final amount payable or refundable have been calculated before filing the income tax return.

Is ITR computation mandatory?

A separate computation statement is not itself an ITR form, but preparing an accurate computation is essential for determining the figures that must be reported in the return.

Which financial year applies to AY 2026-27?

AY 2026-27 relates to income earned during FY 2025-26.

Can CAs prepare ITR computation using software?

Yes. Professional income tax software can automate calculation, regime comparison, tax-credit adjustments, validation and return preparation, which is particularly useful for CA firms managing multiple clients.

Conclusion

An accurate ITR computation for AY 2026-27 should connect every stage of the return: income, deductions, losses, tax regime, tax calculation and available credits.

For individual taxpayers, a clear computation makes the return easier to understand and verify. For CA firms, a structured computation workflow becomes even more important because errors and repeated manual work multiply as the number of clients increases.

CompuTax Professional helps CAs and tax professionals move from client data and tax computation to validation and ITR filing through a more integrated workflow.

Disclaimer

This article is for general informational purposes and reflects the provisions applicable to AY 2026-27 as available on 19 August 2026. Actual income tax computation depends on the taxpayer's income, residential status, tax regime, deductions, losses and other circumstances. Verify current Income Tax Department guidance or consult a qualified tax professional before filing.