Assessment Year

The Income-tax Act, 2025 abolished both of the terms this entry is about. Section 3(1) provides that tax year means the twelve months period of the financial year commencing on the 1st April, and the 2025 Act has no assessment year and no previous year at all. One concept replaces two.

That does not make the older pair obsolete yet, and the reason is worth stating precisely. Section 536(2) of the 2025 Act continues the repealed Income-tax Act, 1961 for any tax year beginning before 1 April 2026, and the Finance Act, 2026 charges income-tax for the assessment year commencing 1 April 2026 under the 1961 Act itself, at the rates in Part I-A of its First Schedule. So for income of the financial year 2025-26 and earlier, the assessment year and previous year framework described below is the framework that applies, and it is what a return filed in 2026 is filed under.

From tax year 2026-27 onward there is one period and one name for it. An HR or payroll team should expect both vocabularies in circulation for the next few years, and should be careful which one a form, a notice or a piece of software means.

The Income Tax Act draws a line between the year in which income arises and the year in which it is assessed. The first is the previous year, which for salaried employment is the financial year running 1 April to 31 March. The second is the assessment year, which is the twelve months immediately following it.

The reason for the split is procedural. Income cannot be finally assessed until the year in which it arose has ended, so assessment necessarily happens afterwards. Everything else follows from that: the return is filed in the assessment year, the assessment is made in it, and correspondence about the income refers to it.

The practical rule is that anything happening during the year uses the financial year, and anything happening after it uses the assessment year.

• Financial year: salary computation and the tax projection, investment declarations and evidence, regime selection, quarterly salary tax statements, the annual certificate, and every payroll conversation with an employee during the year.
• Assessment year: the income tax return, self-assessment and advance tax challans for the year being assessed, notices and assessments, and appeals.

The awkward cases sit at the boundary. A challan for tax deducted from salary is paid during the financial year and identifies the assessment year. An employee paying self-assessment tax in July is paying for the financial year that ended in March, under the assessment year that started in April. Both moments invite the wrong selection.

The rates that apply are those enacted for the financial year in which the income arose. So a rate change announced in a Finance Act applies to the income of the year it covers, not to whatever is being assessed at the time it was passed.

• A challan paid under the wrong assessment year. The money reaches the department and is credited to a period the employee is not claiming for, so the annual statement shows nothing and the liability appears unpaid. Correcting it means a challan correction rather than another payment.
• A return filed for the wrong assessment year, which then has to be revised.
• An employee reading their annual statement for the wrong year and concluding their employer has not deposited their tax.
• Payroll teams answering a query about a year without establishing which year the employee means, so both sides talk past each other.
• Forms and internal templates labelled with one term while asking for the other, which is a small drafting error that generates persistent confusion.

Where an employee reports a missing credit, checking the year is the cheapest first step. A mismatch between the year the payment was made under and the year being claimed accounts for a meaningful share of these cases, and it looks identical to a deposit failure until someone looks.

The explanation that works is a sentence and an example rather than the definitions.

You earn the money in one year and settle the tax on it in the next. The year you earned it is the financial year, and that is what payroll deals with. The year you settle it is the assessment year, and that is what your return says. So salary earned this April is financial year 2026-27, and you will file for it under assessment year 2027-28.

Two practical additions are worth making at the same time.

• When paying anything yourself, check the year on the challan before submitting. It is the field most often wrong and the hardest to correct afterwards.
• When reading your annual tax statement, check which year you have opened. A statement showing no credits is more often the wrong year than a missing deposit.

Payroll teams that put this in the annual declaration communication, rather than explaining it individually each March, save themselves a recurring conversation.