First check the assessment year and the Act and section cited in your demand order. For a demand governed by section 220(2) of the Income-tax Act, 1961, late-payment interest is generally simple interest at 1% for each month or part of a month after the notice’s payment period expires, calculated on the unpaid amount. Penalties and other interest charges are separate items, not part of one combined formula.
Which Act and tax year apply to your demand?
Use the assessment year and the provision printed on your own order or notice—not simply the date you are reading it or paying it. The Income-tax Act, 2025 took effect on 1 April 2026, but proceedings for earlier tax years continue under the Income-tax Act, 1961 under the transition provisions. An unpaid demand for AY 2022–23 does not become a demand under the new Act just because it remains outstanding after 1 April 2026. See the Income Tax Department’s New Act transition FAQs and tax payments guidance.
For a demand under the 1961 Act, the relevant post-demand late-payment provision is section 220(2). The corresponding demand provision in the 2025 Act is section 411. Do not apply the old section 220(2) calculation automatically to a new-Act demand; confirm the provision and governing law on the notice and check the applicable rules. The notified Income-tax Rules, 2026 are also relevant to new-Act matters.
How do you calculate section 220(2) interest?
Section 220(2) of the 1961 Act says an assessee is liable to pay “simple interest at one per cent for every month or part of a month” for the specified delay in paying the demand. It is not compound interest. Use the text of section 220 and follow these steps against the dates and amounts in your order history.
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- Find the payment deadline. Read the demand notice for its payment period and due date, and check for any valid extension or instalment order. A section 156 notice usually allows 30 days, but the notice controls; a shorter period may be specified with the required approval. The Department’s section 220 material and the notified Income-tax Rules, 2026 address the applicable process.
- Establish the unpaid base. Start with the amount to which section 220(2) applies, then account for payments, credits and any later order that reduces or otherwise changes the demand. Do not use the original demand figure if the effective amount has since changed.
- Count chargeable months. Start on the day immediately after the payment period expires and count each month or part of a month through the payment date. Because the statute includes a “part of a month,” a partial month counts; use the actual notice dates, payment dates and applicable order adjustments rather than estimating by elapsed days.
- Apply the rate to the relevant unpaid amount. For each counted month or part, calculate 1% of the applicable unpaid base. If the base changes because of a payment or order, the calculation must reflect that change for the relevant period.
- Reconcile later changes. Rectification, appeal, revision or another specified order may change the underlying amount and the interest calculation. Recalculate using the operative orders; if the recalculation results in excess interest, it may be refundable under the applicable provisions.
Arithmetic illustration
If ₹10,000 remains unpaid for two counted months, the arithmetic is ₹10,000 × 1% × 2 = ₹200. This is only an illustration of the multiplication, not a case-specific assessment or a Department calculator result. Your counted months and base depend on the notice period, payment date, partial payments, rounding and any relevant order adjustments.
Which demand components are interest, and which are penalties?
A demand can include several legally distinct components. Check the section cited beside each amount in the assessment computation and any separate penalty order; do not add all charges together and apply the section 220(2) rate to them as if they were one charge.
| Component | What it relates to | How to treat it when checking section 220(2) |
|---|---|---|
| Section 220(2), Income-tax Act, 1961 | Late payment of a demand after its payment period expires; simple interest at 1% for each month or part of a month. Section 220. | Calculate from the applicable unpaid base and chargeable period. |
| Sections 234A, 234B and 234C | Interest relating to different defaults tied to return filing and advance-tax timing. The Department describes these under Interest and Fees. | These may already be included in the assessment computation before the demand becomes payable. Do not count them again as section 220(2) interest. |
| A separately imposed penalty | A penalty under the provision stated in the penalty order; its grounds, base, rate, defences and procedural consequences depend on that provision and the case facts. See the Department’s interest and fees guidance. | Read the penalty order separately. There is no single penalty percentage that can be applied to the whole demand. |
One narrow transition rule should not be mistaken for a general penalty exemption: the Finance Bill 2026 states that, for section 270A penalty demands from assessments or reassessments made on or after 1 April 2027, section 220(2) interest does not run up to the specified Commissioner of Income-tax (Appeals) order date, or up to the specified Income Tax Appellate Tribunal order date in the described Dispute Resolution Panel cases. This qualification is limited to the stated cases; it does not apply to every penalty demand. See the Finance Bill 2026.
How can you check or respond to an outstanding demand?
Use the e-Filing portal to compare the online demand with the notice, assessment computation and your payment records. The Income Tax Department’s Response to Outstanding Demand guidance describes the portal process.
- Sign in to the e-Filing portal and open Pending Actions → Response to Outstanding Demand. Check the demand against your PAN.
- Compare the demand reference number, assessment year, order and notice dates, and the tax, interest and penalty breakdown. Reconcile TDS, advance-tax and self-assessment-tax credits, as well as challans and other payments.
- If you agree with the demand, use the demand’s Pay Now route when available, then retain the challan or receipt. The Department lists online payment, NEFT/RTGS and counter payment options in its Tax Payments FAQ.
- If you partly disagree, submit the portal response and pay the portion you do not dispute. The Department says a taxpayer who partially disagrees should pay the undisputed portion.
- If you disagree with the full demand, choose the full-disagreement route and provide the reason and details requested on the portal. A disagreement response does not itself change the order’s arithmetic; use the applicable rectification, appeal or other remedy where appropriate.
If you need more time or instalments, apply to the Assessing Officer before the notice deadline where possible. The 1961 Act gives the officer discretion to allow an extension or instalments on application; approval is not automatic. For a significant penalty or a disputed old-year assessment, have a qualified Indian tax professional review the order, calculations and procedural dates.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can change the calculation?
The amount shown on an original demand is not necessarily the final interest base. Payments reduce what remains unpaid, and a later rectification, appeal, revision or other specified order may alter the underlying demand and require a revised interest calculation. Keep the orders and payment evidence together so you can trace the amount and period used.
The Department’s guidance also describes possible reduction or waiver under section 220(2A), subject to statutory conditions and the authority’s process. It is not automatic: eligibility depends on the taxpayer’s circumstances and the applicable tests. See Interest and Fees.
This guide explains the general calculation and portal process, not the amount payable in an individual case. A specific calculation requires the actual notice, assessment order, payment ledger, credits and any later procedural orders. Portal labels and law may change, so verify the current notice and applicable provisions.
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