234A late ITR filing + 234B shortfall + 234C quarterly installments. 1% per month penalty. 15-45-75-100% quarterly benchmarks. Seniors exempt. ₹5-50K typical penalty.
THREE INTEREST SECTIONS: (1) 234A = INTEREST ON LATE ITR FILING. 1% per month. From original due date till actual filing. (2) 234B = INTEREST ON NON-PAYMENT/SHORTFALL OF ADVANCE TAX. 1% per month. If advance tax paid < 90% of liability. From April 1 (next FY) till final payment/ITR filing. (3) 234C = INTEREST ON INSTALLMENT SHORTFALLS. 1% per month per quarter shortfall. Quarterly: 15%/45%/75%/100% benchmarks. ALL: 1% per month or part thereof.
234C QUARTERLY INSTALLMENTS (FY 2026-27): (1) JUNE 15: pay 15% of total tax. (2) SEP 15: 45% cumulative. (3) DEC 15: 75% cumulative. (4) MARCH 15: 100%. SHORTFALL INTEREST: (1) Q1 shortfall: 1% × 3 months = 3% per shortfall. (2) Q2: 1% × 3 months = 3%. (3) Q3: 1% × 3 months = 3%. (4) Q4: 1% × 1 month = 1%. CUMULATIVE: max ~10% per year for serial shortfalls. SAFE HARBOR: if total tax < ₹10K, no advance tax required.
234B EXAMPLE: ESOP holder. (1) Total FY income tax: ₹5L. (2) TDS deducted: ₹2L. (3) Advance tax paid by March 15: ₹1L. (4) Total paid by FY end: ₹3L. (5) ITR filed July 31 (4 months later). (6) SHORTFALL: ₹5L - ₹3L = ₹2L. (7) PAID > 90%? ₹3L/₹5L = 60% — NO. (8) 234B INTEREST: 1% × 4 months × ₹2L = ₹8,000. (9) PAY ₹2L tax + ₹8K interest at ITR filing. STRATEGIC: monitor advance tax + TDS quarterly. PAY excess in March if uncertain (refund-able).
EXEMPTIONS from advance tax + 234B/C: (1) SENIOR CITIZENS (60+): NO ADVANCE TAX requirement IF no business income (only salary, interest, capital gains). (2) RESIDENT INDIANS: total tax < ₹10K — no advance tax. (3) SMALL BUSINESSES Section 44AD: pay advance tax once by March 15 (single installment, not quarterly). (4) SMALL PROFESSIONALS Section 44ADA: same single installment rule. STRATEGIC: senior + retired with pension + dividend + interest: NO ADVANCE TAX needed. Pay via TDS + final ITR.
AVOID PENALTY STRATEGIES: (1) TRACK QUARTERLY: estimate income + tax liability. (2) PAY ADVANCE TAX at 15-45-75-100% benchmarks. (3) NEW INCOME SOURCES mid-year (ESOP exercise, capital gains, freelance): re-estimate + pay catch-up advance. (4) MARCH 15 SAFETY NET: if shortfall, pay 100% by March 15 to avoid future 234B. (5) USE INCOME TAX CALCULATOR for projection. (6) EMPLOYER TDS sometimes insufficient — supplement with advance tax. (7) FREELANCERS + CONSULTANTS: highest risk — proactively pay quarterly. (8) STOCK GAINS late in FY: pay supplementary advance March 15. (9) ENGAGE CA if income > ₹50L or multiple sources. ANNUAL ₹5-50K typical penalty if neglected — avoid via small effort.