Self-assessment Tax: Meaning, Calculation, Payment and Challan Download

The calculation starts with the final tax liability for the relevant period. The taxpayer then accounts for eligible tax credits and adds any applicable interest or fees.

Follow these steps:

1. Calculate your taxable income. Include income from all applicable sources, such as salary, house property, business or profession, capital gains and other sources. Apply the deductions, exemptions and loss adjustments permitted under the applicable tax regime.
2. Calculate the tax liability. Apply the relevant tax rates and account for any eligible rebate, surcharge, cess, relief or tax credit.
3. Add applicable interest and fees. Check whether interest or fees are payable under the provisions governing your tax period. The applicable rules depend on the facts of the case and the law in force for that period.
4. Subtract taxes already paid or credited. Account for eligible TDS, TCS, advance tax and other available tax credits.
5. Pay the remaining balance. If the result is a positive amount, it is the balance payable, subject to the correct calculation and available credits.

A simplified formula is:

Self-assessment tax payable = Final tax liability + applicable interest and fees − eligible taxes already paid or credited

If the result is zero or negative, there may be no additional self-assessment tax payable. However, the taxpayer should verify the figures and any refund eligibility before filing.

Example of self-assessment tax calculation

Consider this illustrative example:

In this example, the taxpayer has a total amount payable of Rs. 52,000. After adjusting Rs. 40,000 in eligible tax credits and advance tax, Rs. 12,000 remains payable.

The figures are illustrative. Actual tax liability, interest, fees and credits will depend on the taxpayer’s circumstances and the rules applicable to the relevant period.

Both are ways of paying income tax, but they differ in timing and purpose.

Under the rules applicable to FY 2025–26, advance tax generally applies when the estimated tax liability, after accounting for TDS, is Rs. 10,000 or more, subject to statutory exceptions. Do not automatically apply this threshold to a different tax period without checking the relevant rules.

Self-assessment tax can be paid through the official Income Tax Department e-Filing portal. The steps and payment options depend on the applicable Act and tax period.

1. Open the official portal. Visit the Income Tax Department e-Filing website.
2. Select e-Pay Tax. Choose the e-Pay Tax option. The portal may allow you to start a payment before logging in or through your registered account.
3. Select the applicable Income-tax Act. Choose the Income-tax Act, 1961 for payments relating to AY 2026–27 and earlier applicable assessment years. Choose the Income-tax Act, 2025 for Tax Year 2026–27 onwards, as directed by the portal.
4. Choose the relevant tax payment category. Select the applicable income tax or corporation tax payment option, depending on whether the taxpayer is an individual or a company.
5. Select self-assessment tax. Choose the self-assessment tax payment category and the correct tax period.
6. Enter the payment details. Provide the required tax amount and its applicable breakup, including interest or other amounts where relevant.
7. Choose a payment method. Select an available option, such as net banking, debit card, UPI or another mode offered by the portal for the transaction.
8. Review and submit. Check the taxpayer details, Act, tax period, payment category and amount before completing the transaction.
9. Save the receipt. Download or retain the payment confirmation and challan details for your records.

The portal’s instructions take precedence if the screen labels or payment options differ. Refer to the official Income Tax Department challan creation guide for the relevant payment flow.

Which challan should you select?

The challan depends on the applicable Act, tax type and payment period.

For income tax payments relating to AY 2026–27 and earlier relevant assessment years, the portal uses the applicable Income-tax Act, 1961 payment flow, including ITNS 280 for ordinary self-assessment tax payments. For Tax Year 2026–27 onwards, the Income-tax Act, 2025 payment flow uses the corresponding new challan format, such as ITNS 280N for the relevant income tax payment category.

Do not select a challan solely because its number appears in an older guide. Confirm the applicable Act, tax period and payment category on the official portal before making payment.

A challan or payment receipt is evidence that a tax payment was made. Keep it with your tax records and use its details when checking your return.

To retrieve your payment record:

1. Visit the Income Tax Department e-Filing portal.
2. Open the relevant e-Pay Tax or payment-history facility, following the options available for your login and transaction.
3. Locate the payment using the details shown in your account.
4. Download or save the available challan or payment receipt.
5. Check the payment amount, date, tax period and other details against your records.

The exact menu names and available retrieval options may change as the portal is updated. If the payment does not appear, check the transaction status with the payment provider and consult the portal’s official help resources before making a duplicate payment.

Self-assessment tax settles the balance identified during tax calculation, but the taxpayer must still complete the applicable return-filing requirements.

Before submitting the ITR:

• Check that the income reported includes all applicable sources.
• Reconcile TDS and TCS with the available tax records.
• Verify advance tax and other eligible payments.
• Include applicable interest and fees in the calculation.
• Confirm that the self-assessment tax payment relates to the correct tax period.
• Enter or verify the payment details in the relevant section of the return.
• Retain the payment receipt and the return acknowledgement.

A payment made under the wrong tax period or payment category may require correction or follow-up. If the payment is not reflected in the tax records, investigate the discrepancy rather than assuming that the return has been fully settled.

If a balance remains unpaid, or the amount paid is insufficient, the taxpayer may face additional interest, a tax demand or other consequences under the applicable law. The outcome depends on the tax period, the amount outstanding, the return-filing circumstances and the provisions that apply.

For returns relating to FY 2025–26, provisions of the Income-tax Act, 1961 continue to govern the relevant assessment. For Tax Year 2026–27 onwards, the Income-tax Act, 2025 and applicable rules govern the payment and compliance requirements.

Do not assume that all interest begins on the same date or that every unpaid amount attracts the same consequence. Check the rules for the specific tax period or consult a qualified tax professional if the calculation is unclear.

Self-assessment tax is the balance payable after a taxpayer calculates their final income tax liability and adjusts eligible taxes already paid or credited. An accurate calculation, correct selection of the tax period and payment category, and retention of the challan help support proper ITR filing. Because India’s income tax framework transitioned to the Income-tax Act, 2025 from 1 April 2026, taxpayers should take particular care to select the correct Act and period when making a payment. For complex calculations, mismatched credits or uncertain interest obligations, consult the official Income Tax Department guidance or a qualified tax professional.