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The accounts payable team deducted Rs 42,300 in TDS on a contractor payment under Section 194C in April, paid the challan into the correct account, and closed the compliance for the month. Four months later, a Section 200A intimation lands from the Centralised Processing Centre for TDS showing Rs 2,538 in interest sitting on top of the original deposit. The team reads the intimation twice — the TDS amount is right, the payment reference is right, but there is a new line for interest that nobody was expecting. The controller wants to know whether the interest is defensible against the deduction ledger, whether it triggers a wider recomputation across other vendors, and whether the underlying error is a one-off or a systemic gap in the monthly close routine.
Interest surfaces on a TDS challan under Section 201(1A) of the Income-tax Act 1961 when either or both of two clocks have run. Clock one — 1 per cent per month or part of a month from the date the tax was deductible to the date the tax was actually deducted, where the deductible date is fixed by the underlying section (Section 194C on credit or payment whichever is earlier, Section 192 on payment of salary, and so on). Clock two — 1.5 per cent per month or part of a month from the date of deduction to the date of actual payment to the Central Government, where the deposit deadline is fixed by Rule 30 at seven days from the end of the deduction month, with a special 30 April deadline for March deductions. Rule 119A treats any fraction of a month as a full month for the interest computation, which amplifies short delays into full-month interest hits. Common triggers are a missed 7-of-following-month deposit, a Section 200A short-deduction top-up made months after the original challan, a Section 206AA PAN-validation failure that was not caught at deduction time, and a cross-era Section 393 payment-code mis-tag that sends the deposit to the wrong account.
A monthly TDS deduction register keyed by section (Section 194C, 194J, 194H, 194I, 194Q, 192, 195, 206AA, and so on) with the deductible date, the actual deduction date, and the deposit challan reference on every line. A calendar overlay showing the Rule 30 deposit deadline for each deduction month (7 of the following month, plus the 30 April override for March). A PAN-validation check at the vendor onboarding gate to catch Section 206AA higher-rate triggers before they surface as a short-deduction on Form 26AS. A cross-reference from every deposit challan to the matching Section 393(1) payment code (from 1 April 2026 under the Income-tax Act 2025) and a suspense-account monitoring routine to catch wrong-account deposits before the interest clock compounds. A Section 200A intimation reconciliation routine that ties every CPC-TDS demand back to the deduction register within seven days of receipt.
A quarter-end pack showing every deduction with the deductible date, deduction date, deposit date, applicable Section 201(1A) interest (both clocks separately), Section 234E fee if the corresponding Form 26Q was filed late, and the total challan payable including interest. A month-by-month exception queue listing every deduction where Clock one or Clock two ran, with the root-cause bucket (missed deadline, short deduction, PAN failure, wrong-code deposit, non-deduction) and the corrective action. A running Section 40(a)(ia) 30 per cent disallowance exposure register for any deduction where the deposit is trending past the Section 139(1) return-filing due date. Form 26Q filings that reconcile to the deposited challans without a Section 200A demand three months later, and where a demand does surface, the deduction register defends the exact interest computation to the Assessing Officer without a follow-up query.
You deducted Rs 42,300 in TDS on a contractor payment in April. You paid the challan into the correct account. You closed the month.
Four months later, a Section 200A intimation from the Centralised Processing Centre for TDS lands in the finance inbox showing Rs 2,538 in interest sitting on top of the original deposit. The TDS amount is right. The payment reference is right. But there is a new line for interest that nobody expected — and the intimation does not spell out what caused it.
This is the plain-English walkthrough of the five most common reasons Section 201(1A) interest surfaces on a TDS challan, how the 1 per cent versus 1.5 per cent distinction is actually applied, and where in the ledger you look first.
The quick answer
Interest surfaces on a TDS challan under Section 201(1A) of the Income-tax Act 1961 in two flavours. The 1 per cent per month clock runs from the date on which the tax was deductible to the date on which it was actually deducted — a late-deduction penalty. The 1.5 per cent per month clock runs from the date of deduction to the date the tax was actually paid to the Central Government — a late-deposit penalty. Rule 119A treats any part of a month as a full month for the interest computation, which is what turns short delays into full-month interest hits.
On a Rs 42,300 TDS deduction that is four months late to the deposit account, the arithmetic is Rs 42,300 x 1.5 per cent x 4 months = Rs 2,538 in interest. That is the line the intimation is showing. The question is which of the five common triggers put you there — and whether it is a one-off breach or a systemic gap that will surface across the rest of the vendor ledger next quarter.
Bucket 1 — you missed the 7-of-following-month deposit deadline
Rule 30 of the Income-tax Rules 1962 sets the TDS deposit deadline at seven days from the end of the month in which the deduction was made. A deduction booked on 28 May has a deposit deadline of 7 June — not 30 June. This is the single most common cause of a Section 201(1A) intimation, and it is the one teams misread most often.
Two variations trip teams up. First, the March deduction — Rule 30(2)(b) gives March a special deposit deadline of 30 April rather than 7 April. Teams that follow the standard 7-of-following-month rule either deposit early on 7 April and give up the working capital, or (more commonly) misapply the rule and deposit sometime in mid-April with the belief that they are within the deadline. Second, teams that book deductions on the last two or three days of the month sometimes lose the calendar days to the month-end close and the deposit slips past the 7th of the next month by three or four days — under Rule 119A, that four-day slip pulls a full month of 1.5 per cent interest on the entire TDS amount.
Where to look. Pull the deduction date column against the deposit challan date column. Any deposit that lands more than seven days after the end of the deduction month is in this bucket. Section 194C, Section 194J, Section 194H, Section 194I, Section 194Q, Section 194O, Section 192 — the deadline is the same seven-day window for all of them (Rule 30(2)(a)), with the March override the only exception.
Bucket 2 — you short-deducted originally and topped up later
You booked the deduction at 1 per cent when Section 194C says 2 per cent for a company payee. Or you deducted 2 per cent Section 194C when the vendor was actually a labour contractor with a valid Section 197 lower-deduction certificate you missed. Three months later, a Section 200A intimation surfaces the short-deduction, and you deposit a top-up challan to close the shortfall.
The top-up is a fresh late-deposit event. The 1.5 per cent per month clock runs from the original deduction date to the top-up deposit date on the differential TDS amount — and Rule 119A treats every part-month as a full month. A top-up made three months after the original deduction pulls three months of 1.5 per cent on the shortfall.
The full TDS penalty and interest regime for India works through the interaction between Section 201(1A) interest, Section 234E late-filing fee, Section 271H non-filing penalty, and Section 40(a)(ia) 30 per cent disallowance for every one of the common short-deduction cases the CPC-TDS routinely challenges.
Where to look. Any deduction where the challan amount is materially below the invoice value times the section rate. Cross-reference against the Section 200A intimation queue to identify shortfalls where a top-up was made — the interest on the top-up ride is a separate line item on the intimation.
Bucket 3 — a Section 206AA PAN validation failure surfaced late
Section 206AA of the Income-tax Act 1961 requires TDS at the higher of the section rate, the applicable rate in force, or 20 per cent, wherever the payee has not furnished a valid Permanent Account Number. A vendor whose PAN was accepted at onboarding but subsequently fails a portal-level validation (deceased status, inactive status, mismatched name) triggers the 20 per cent higher-rate deduction retroactively — a 10 per cent Section 194J deduction becomes a 20 per cent Section 206AA deduction, and the differential 10 per cent is a short-deduction from the CPC-TDS view.
The short-deduction re-triggers a Section 201(1A) shortfall. Clock one (1 per cent) runs on the differential from the original deductibility date. Clock two (1.5 per cent) runs on the differential from the deduction date to the top-up deposit date. Both clocks apply because the top-up is a fresh event on a shortfall that should have been deducted originally.
Where to look. Every vendor PAN validation status on the deduction register. Vendors flagged as invalid, inactive, or duplicate PAN in the CPC-TDS validation are the source of this bucket. The Form 26Q filings from the last four quarters are the most efficient starting point — the CPC-TDS lists the shortfall PAN wise.
Bucket 4 — the deposit went to the wrong section code
You deducted under Section 194C (works contract) but the challan carried the Section 194J (professional services) code. Or you made a Section 194Q (purchase of goods) deposit in April 2026 under the legacy Section 194Q code rather than the new Section 393(1) code 1031 that the Income-tax Act 2025 mandates from 1 April 2026. The money reaches the government but sits in the wrong account — the correct-code account shows as unpaid, and the Section 201(1A) 1.5 per cent per month clock keeps running on the correct-code account until the deposit is moved through the Assessing Officer route.
This is the cross-era gotcha that is going to surface heavily during the 1 April 2026 transition to the Income-tax Act 2025. The Section 393 payment code finder is the fastest way to confirm the correct code before every challan is generated — the tool takes the historical section (Section 194A, 194C, 194J, 194H, 194I, 194Q, 195, 206AA, 206C(1H) and every other Chapter XVII-B section) and returns the matching Section 393(1) code plus the deposit deadline for the current period.
Where to look. Compare the deposit challan section code against the deduction register section code for every line. Any mismatch is either a wrong-code deposit (the deposit needs to be moved) or a wrong-code deduction (the underlying section classification needs review).
Bucket 5 — you deducted but never deposited at all
The Section 201(1A) 1.5 per cent per month clock keeps running until the deposit lands. On a Rs 42,300 TDS deduction, at 1.5 per cent per month across four months, the interest is Rs 2,538. Across twelve months, the interest is Rs 7,614. Across the full Section 139(1) return-filing gap for the year, the interest is the visible line — but the real exposure is the Section 40(a)(ia) 30 per cent disallowance of the underlying expense if the deposit does not land before the corporate return-filing due date.
On a Rs 5 lakh gross contractor bill deducted at Section 194C 2 per cent (Rs 10,000 TDS), a non-deposit that survives past the Section 139(1) date disallows Rs 1,50,000 of the expense — a corporate-tax hit at the applicable rate that is many multiples of the Rs 10,000 TDS liability plus any interest.
Where to look. Any deduction on the register with no matching deposit challan reference. The Form 26Q filings surface the underlying issue quickly — the CPC-TDS system tracks deposited-versus-deducted per PAN, and a persistent gap surfaces first as a Section 200A intimation and then as a Section 156 demand.
The one to escalate first — the Section 40(a)(ia) exposure
If interest is surfacing on the challan and the underlying trigger is Bucket 5 (never deposited) or Bucket 2 (short-deducted with a top-up that has still not been made), the escalation is not the interest — it is the Section 40(a)(ia) disallowance risk. Section 40(a)(ia) of the Income-tax Act 1961 disallows 30 per cent of the underlying expense where TDS is not deposited before the due date of the corporate income-tax return under Section 139(1). The corporate-tax cost of that disallowance is materially larger than the Section 201(1A) interest sitting on the challan.
The escalation is to the tax consultant and the CFO. The fix — depositing the shortfall before the Section 139(1) date — has a hard calendar deadline that the statutory auditor tracks, and it is a computed-income question that the finance function has to resolve before the audit sign-off.
Alongside Section 40(a)(ia), watch for two parallel charges. Section 234E of the Income-tax Act 1961 is a Rs 200 per day fee for late filing of Form 26Q, capped at the TDS amount itself. Section 271H is a Rs 10,000 to Rs 1,00,000 penalty at the Assessing Officer’s discretion for non-filing or incorrect filing of the TDS statement. Both are independent of the Section 201(1A) interest — a late-filed Form 26Q with an on-time deposit pays Section 234E but no Section 201(1A). A late-deposited challan with a late-filed Form 26Q pays both. Both must be settled before the return is treated as validly filed.
The Section 200A demand notice reconciliation workflow walks through the demand-classification, defence-preparation, and rectification-route path for each of the four classes of Section 200A demand — short deduction, short payment, late payment, and late filing — with the exact route to reconcile each back to the deduction register.
When the monthly close outgrows the spreadsheet
For a controller managing 20 to 30 anchor vendors across two or three TDS sections, a spreadsheet-based deduction register with the deposit challan reference column, the Rule 30 deadline overlay, and the Section 200A intimation reconciliation column is workable. The monthly close routine holds — deduct on the 25th, deposit on the 5th of the next month, file Form 26Q by the 31st of the following month, no interest surface.
For a mid-market manufacturer running 200 to 500 active vendors across Section 194C, Section 194J, Section 194H, Section 194I, Section 194Q, Section 194O, Section 192, and Section 195 in parallel — often across multiple state units with separate TAN registrations — the spreadsheet-based approach starts to leak. The 7-of-following-month deadline gets missed on one section while it is met on the others. A Section 206AA PAN-validation failure surfaces three months late in a Form 26AS reconciliation. A wrong-code deposit sits in the suspense account for a whole quarter. The intimation queue from CPC-TDS becomes a stack that the controller cannot triage from the deduction register any more.
The moment the deduction register runs across more than 30 vendors and the monthly close is chasing per-section deposit calendars manually, the manual process becomes the failure mode itself. The monthly and quarterly TDS reconciliation runbook documents the tempo that keeps the reconciliation inside the close, and the Form 168 shortfall investigation playbook documents the year-end reconciliation route when the shortfall register has drifted through the year. Beyond that scale, TDS reconciliation software treats the deduction register, the deposit calendar, and the Section 200A intimation queue as continuously refreshed first-class outputs rather than a quarter-end forensic exercise the controller runs by hand.
Go deeper
- The full TDS penalty and interest regime for India — Section 201(1A), Section 234E, Section 271H, Section 40(a)(ia) treated end to end
- Section 200A demand notice reconciliation — the four classes of CPC-TDS demand and the defence route for each
- Form 168 shortfall investigation for the tax year — the year-end reconciliation route when the shortfall register has drifted through the year
- The monthly and quarterly TDS reconciliation runbook — the tempo that keeps the reconciliation inside the close
- Section 393 payment code finder — the historical section to Section 393(1) code lookup for the 1 April 2026 Income-tax Act 2025 transition
- TDS reconciliation software for India — when the manual deduction register outgrows itself
Content authored by practitioners with experience at Amazon India, Intuit QuickBooks, and the Tata Group. Meet the team →
- ▸ Section 201(1A), Income-tax Act 1961 — Where any person, including the principal officer of a company, does not deduct the whole or any part of the tax or, after deducting, fails to pay the same as required by or under this Act, he shall be liable to pay simple interest at one per cent for every month or part of a month on the amount of such tax from the date on which such tax was deductible to the date on which such tax is deducted; and at one and one-half per cent for every month or part of a month on the amount of such tax from the date on which such tax was deducted to the date on which such tax is actually paid. This is the split behind every rupee of interest that surfaces on a TDS challan — the 1 per cent clock runs from the deductibility date to the deduction date, and the 1.5 per cent clock runs from the deduction date to the actual deposit date.
- ▸ Rule 30, Income-tax Rules 1962 — All sums deducted in accordance with the provisions of Chapter XVII-B by an office of the Government shall be paid to the credit of the Central Government on the same day. In any other case, tax deducted at source under Section 192 to 194LC and Chapter XVII shall be paid to the credit of the Central Government on or before seven days from the end of the month in which the deduction is made or income-tax is due under Section 192(1A). The March deduction has a separate deposit deadline — on or before the thirtieth day of April. Interest under Section 201(1A) begins running the day after the applicable Rule 30 deadline is missed.
- ▸ Rule 119A, Income-tax Rules 1962 — In calculating the interest payable by the assessee, or the interest payable by the Central Government to the assessee, under any provision of this Act, any fraction of a month shall be deemed to be a full month, and the interest shall be so calculated. This is why a five-day delay in depositing TDS pulls a full month of 1.5 per cent interest — the calendar week is deemed a full month, and the interest is calculated on the whole month's rate.
- ▸ Section 234E, Income-tax Act 1961 — Where a person fails to deliver or cause to be delivered a statement within the time prescribed in sub-section (3) of Section 200 or the proviso to sub-section (3) of Section 206C, he shall be liable to pay, by way of fee, a sum of two hundred rupees for every day during which the failure continues. The amount of fee shall not exceed the amount of tax deductible or collectible. Section 234E is a separate charge from Section 201(1A) interest — a delayed Form 26Q filing runs a Rs 200 per day fee in addition to the interest already sitting on the challan for late deposit, and both are payable before the return is filed.
- ▸ Section 271H, Income-tax Act 1961 — Without prejudice to the provisions of the Act, the Assessing Officer may direct that a person who fails to deliver or cause to be delivered a statement within the time prescribed in Section 200(3) or Section 206C(3), or furnishes incorrect information in the statement, shall pay by way of penalty a sum which shall not be less than ten thousand rupees but which may extend to one lakh rupees. The penalty is over and above Section 234E fee and Section 201(1A) interest, and applies where the failure or the incorrect information persists beyond a threshold the Assessing Officer treats as non-compliance rather than delay.
- ▸ Section 206AA, Income-tax Act 1961 — Notwithstanding anything contained in any other provisions of this Act, any person entitled to receive any sum or income or amount, on which tax is deductible under Chapter XVII-B, shall furnish his Permanent Account Number to the person responsible for deducting such tax, failing which tax shall be deducted at the higher of the rate specified in the relevant provision of this Act, the rate or rates in force, or twenty per cent. A short-deduction traceable to a missing or invalid PAN — 10 per cent Section 194J instead of 20 per cent Section 206AA higher rate — re-triggers a Section 201(1A) shortfall on the differential 10 per cent, with both the 1 per cent late-deduction clock and the 1.5 per cent late-deposit clock running until the top-up challan is paid.
- ▸ Section 393(1), Income-tax Act 2025 — The Income-tax Act 2025 consolidates the tax deduction and collection provisions of the Income-tax Act 1961 into a single Section 393(1) omnibus, effective 1 April 2026. Each historical section maps to a numbered payment code (1001 through 1092) that must appear on the challan and on Form 26Q from Q1 FY 2026-27. A deposit made under the legacy section code after 1 April 2026 is treated as a wrong-account deposit — the money sits in a suspense account, the correct-account challan carries the full 1.5 per cent per month interest for the gap, and the mis-coded deposit has to be moved via the AO route before the correct-account credit is available.