Section 409 of the Income-tax Act, 2025 — When an Assessee is Deemed to be in Default (Advance Tax)

In plain language

What Section 409 actually says

Section 409 of the Income-tax Act, 2025 answers one narrow but important question: when does a taxpayer become an "assessee in default" for not paying advance tax? Crucially, it is not about the ordinary taxpayer who simply pays a little less than the four scheduled advance-tax instalments. Section 409 is triggered specifically where the Assessing Officer (AO) has passed an order under Section 407 directing a person to pay advance tax, and that person then fails to comply. It is the direct successor to Section 218 of the Income-tax Act, 1961 and takes effect from 1 April 2026.

Under Section 409, a person is deemed to be an assessee in default in respect of the instalment(s) if he:

• Does not pay the AO-ordered instalment on time — he fails to pay, by the date specified in Section 408, any instalment of advance tax he was required to pay under an order of the AO made under Section 407(1) or amended under Section 407(4); or
• Does not file the required intimation — where he believes his current income is lower than the AO's estimate, he must send an intimation to the AO under Section 407(8) on or before the date the unpaid instalment falls due, and he fails to do so; or
• Does not pay his own honest estimate — where he files his own higher estimate under Section 407(9), he then fails to pay advance tax on the basis of that estimate for the relevant instalment(s).

Who it applies to

Section 409 applies only to a specific class of taxpayers: those on whom the AO has served an order to pay advance tax under Section 407. The AO can issue such an order to a person who has already been regularly assessed and who, in the AO's view, is liable to pay advance tax but has not paid it. In practice this covers individuals, HUFs, firms and companies whom the department believes are under-paying. If you have never received a Section 407 order and simply pay your advance tax under self-assessment, Section 409 does not label you a defaulter — instead you face interest under Sections 424/425 for shortfall or deferment.

The Section 407 – 408 – 409 chain

These three provisions work as a package for AO-directed advance tax:

• Section 407 — empowers the AO to order a person to pay advance tax, to amend that order (407(4)) if a later return/assessment shows a different figure, and lets the taxpayer respond by intimation (407(8)) or by paying on his own higher estimate (407(9)).
• Section 408 — fixes the due dates and cumulative instalment percentages (15% by 15 June, 45% by 15 September, 75% by 15 December, 100% by 15 March).
• Section 409 — defines the moment of default if the taxpayer ignores the 407 order or the 408 dates.

What happens once you are "deemed in default"

Being deemed an assessee in default is not a mere label — it opens the door to the Act's recovery and penal machinery. The consequences can include:

• Coercive recovery of the unpaid amount as if it were a tax arrear (attachment, garnishee notices, recovery via the Tax Recovery Officer).
• Interest liability for deferment/shortfall of advance tax under Sections 425 and 424 (the successors to Sections 234C and 234B of the 1961 Act).
• Penalty exposure — the AO may levy penalty for the default in accordance with the penalty provisions of the Act.

Practical implications

The practical message is simple. If the department serves you a Section 407 advance-tax order, you have exactly two clean options: pay the ordered instalments by the Section 408 dates, or — if you genuinely expect lower income — file the Section 407(8) intimation before the instalment falls due (or pay your own higher estimate under 407(9)). Doing nothing is the one path that guarantees default status under Section 409, along with interest, recovery action and possible penalty. The law deliberately protects taxpayer autonomy (you can dispute the AO's estimate) but punishes silence and inaction.