Complytax-INCOME TAX COMPLIANCE CALENDAR

Central GST Portals (Applicable to All States & UTs)

Installment	Due Date	Applicable To	Description / Liability	% of Tax Payable	Remarks
1st Installment	15-Jun-2026	All Assessees (incl. Companies)	Pay advance tax on estimated total income for AY 2027-28	At least 15%	Individual, HUF, Firm, Company — all whose estimated tax ≥ ₹10,000
2nd Installment	15-Sep-2026	All Assessees (incl. Companies)	Cumulative advance tax paid to be at least 45% of estimated liability	At least 45% (Cumulative)	If not paid - Interest u/s 234C @ 1% per month
3rd Installment	15-Dec-2026	All Assessees (incl. Companies)	Cumulative advance tax paid to be at least 75% of estimated liability	At least 75% (Cumulative)	Shortfall attracts interest u/s 234C
4th & Final Installment	15-Mar-2026	All Assessees (incl. Companies)	Cumulative advance tax paid to be 100% of estimated liability	100% (Cumulative)	Last chance to avoid interest u/s 234B & 234C
Presumptive Income (Sec 44AD/44ADA/44AE)	15-Mar-2026	Small Business & Professionals	Entire advance tax in single installment (no installments 1-3)	100% in one payment	Eligible for presumptive taxation scheme only
Senior Citizens (≥ 60 yrs) No Business income	N/A	Senior Citizens	Senior citizens with no business income are EXEMPT from advance tax	NIL	Interest u/s 234B/234C not applicable to them

INTEREST FOR DEFAULTS IN ADVANCE TAX

Section	Trigger	Rate	Period	Applicable To	Remarks
Sec 234B	Tax paid < 90% of assessed tax by March 31	1% per month (simple)	From Apr 1 of AY till date of assessment	All assessees	Even if self-assessment tax paid later
Sec 234C	Shortfall in advance tax installments	1% per month (simple)	3 months (15% & 45% shortfall) or 1 month (final)	All assessees	Calculated separately for each installment