📅 SECTION 234A + 234B + 234C · 4 FYs

Advance Tax Calculator FY 23-24 to 26-27

Multi-year advance tax calculator handling Section 234A (filing delay), 234B (default in payment), and 234C (deferment). Per-quarter payment date inputs for accurate delayed payment scenarios. IT Act 1961 + IT Act 2025 section auto-mapping.

Tax Liability Details

Financial Year Income Tax Act, 1961

Total Tax Liability (Annual)

₹

Including cess. Use Income Tax Calculator if unknown.

TDS Already Deducted

₹

From Form 26AS / AIS

Age Category

Below 60 60-80 80+

Income Type Presumptive: 100% by 15 March single installment

Advance Tax Payments — With Dates (for accurate 234C interest)

Q1 (Due 15 Jun)

₹

Q2 (Due 15 Sep)

₹

Q3 (Due 15 Dec)

₹

Q4 (Due 15 Mar)

₹

📅 Leave date blank if not yet paid. Date matters for delayed payment calculation.

Expected/Actual ITR Filing Date 📌 Used for 234A (filing delay) and 234B (default period)

📅

Multi-Year Advance Tax

Calculator handles all 3 interest sections with delayed payment date logic.

📐 Three Interest Sections

234A: 1%/mo for filing delay (after due date)
234B: 1%/mo for 90% default (from 1 Apr of AY)
234C: 1%/mo × 3 for quarterly deferment
+ Senior exemption u/s 207(2) / Sec 405
+ Presumptive single-installment rule

Three Interest Sections — Detailed Comparison

Aspect	Section 234A	Section 234B	Section 234C
Trigger	Filing ITR after due date	Total advance tax < 90% of assessed tax	Quarterly installment not paid in time
Rate	1% per month	1% per month	1% per month × 3 months (Q1-Q3) 1% × 1 month (Q4)
From Date	1st day after ITR due date	1 April of AY (e.g., 1 Apr 2026 for FY 25-26)	Day after quarter due date
Until	Date of actual filing	Date of balance payment / assessment	Next quarter due date or full payment
Base Amount	Tax payable on filing	Shortfall vs 100% advance tax	Quarterly shortfall
IT Act 1961	234A	234B	234C
IT Act 2025	Section 421	Section 422	Section 423

234C Tolerance Rules (Important!)

Q1 (15 Jun): If at least 12% paid (instead of 15%), NO 234C interest
Q2 (15 Sep): If at least 36% paid (instead of 45%), NO 234C interest
Q3 (15 Dec): Full 75% required (no tolerance)
Q4 (15 Mar): Full 100% required (no tolerance)
Presumptive (44AD/ADA/AE): 100% by 15 March, single installment, no quarterly deferment
Senior Citizen Exemption: Resident, 60+, no business income → fully exempt (Section 207(2) / Section 405 IT Act 2025)

Real Scenario — Delayed Payment Impact

Case: Freelancer Rahul, FY 2025-26

Total tax: ₹3L · TDS: ₹50K · Paid ₹50K on 20 Sep (5 days late after Q2 due 15 Sep) · Balance ₹2L paid at filing on 31 July 2026

Section	Calculation	Interest
234C — Q1	Required 15% × ₹2.5L = ₹37,500 (paid ₹0) · 1% × 3 mo	₹1,125
234C — Q2	Required 45% × ₹2.5L = ₹1,12,500 (paid ₹50K, after due date) · 1% × 3 mo	₹1,875
234C — Q3	Required 75% × ₹2.5L = ₹1,87,500 (paid ₹50K) · 1% × 3 mo	₹4,125
234C — Q4	Required 100% × ₹2.5L = ₹2,50,000 (paid ₹50K) · 1% × 1 mo	₹2,000
234B	Net shortfall ₹2L · 1 Apr to 31 Jul = 4 months × 1%	₹8,000
234A	Filed by 31 Jul = due date for non-audit, NO 234A applicable	₹0
Total Interest		₹17,125

💡 CA Insight: Even paying ₹50K mid-year (5 days late) didn't save Rahul much. Had he paid quarterly installments exactly on time, he'd save ₹17,125. Pro tip: Set 15th of every Jun/Sep/Dec/Mar as calendar reminder.

Advance Tax Multi-Year FAQs

Does the date of payment matter, or just the amount?

Date matters! For 234C, if you paid the right amount but AFTER the due date, you still owe interest. Example: ₹37,500 paid on 20 Jun (5 days after 15 Jun deadline) → still triggers 234C because the installment wasn't paid BY the due date. The calculator above accounts for this.

What is Section 234A vs 234B — they sound similar?

234A = ITR FILING delay penalty. You file ITR late → interest from due date to actual filing date. 234B = ADVANCE TAX default. Your total advance tax paid < 90% of assessed tax → interest from April 1 of AY. These can stack: if you both underpay advance tax AND file late, you pay both 234A and 234B.

How does IT Act 2025 change advance tax?

Substantive provisions unchanged. Section numbers change:
• Section 234A → Section 421
• Section 234B → Section 422
• Section 234C → Section 423
• Section 207(2) (Senior exempt) → Section 405
Effective FY 2026-27. Schedule, rates, tolerance — all same.

What if my income estimate changes mid-year?

You can REVISE quarterly installments. If income increases mid-year, pay higher in next installment. If decreases, pay less (but watch 90% threshold for 234B). The calculator accepts your actual paid amounts and dates — no need for quarterly re-projections.

Why presumptive taxpayers get single-installment privilege?

Section 44AD/44ADA/44AE deemed-income provisions assume taxpayers can't accurately predict quarterly cash flows (e.g., transport operators, small businesses). So legislature allowed full 100% by 15 March. Note: this is a PRIVILEGE, not exemption — you still pay all the tax, just on a relaxed schedule.

Can I avoid 234B by paying TDS instead of advance tax?

Yes, indirectly. If your TDS deducted is ≥ 90% of total tax liability, 234B doesn't apply. So if you're salaried with significant other income, declare other income to your EMPLOYER (extra TDS deducted) rather than paying advance tax yourself. Less paperwork, same outcome.