Income Tax

TDS Default Consequences: Interest, Disallowance and Vendor Credit Issues

Finin2min Tax Desk·June 2026·7 min read40(a)(ia)

TDS default is not one problem. It can create interest, disallowance of expense, TDS return correction work, vendor credit disputes and demand exposure. Finance teams should treat TDS as a monthly close control.

For broader context, see the Income Tax and Salary Hub.

Default types

Default	Immediate risk	Secondary risk
Tax not deducted	Interest and disallowance exposure.	Vendor may not get credit.
Tax deducted but not deposited	Interest and serious compliance escalation.	Expense disallowance and vendor dispute.
Wrong PAN/section/amount	Tax credit mismatch.	Correction statement and follow-up.
Late TDS statement	Late fee/filing issue.	Delayed credit to vendor.

Use the Dividend Income Tax and TDS Credit Calculator to apply these points to your figures or facts.

Official consequence reference

Official Income Tax Department guidance states that failure to deduct or deposit TDS can trigger interest, and Section 40(a)(ia) can result in 30% disallowance where applicable for resident payments subject to TDS and not deducted/deposited as required.

For the connected rule, example or next step, see TDS on Bank and Other Interest: ₹50,000, ₹1 Lakh and ₹10,000.

Monthly TDS control

Run unpaid vendor ledger before month-end.
Map each vendor to TDS section and threshold.
Deduct at credit/payment as required by section.
Deposit and file return on time.
Reconcile Form 26Q/24Q with books and vendor confirmations.

Finin2min warning

TDS errors compound. A small missed deduction can become interest, disallowance and vendor-credit friction.

📝

Keep your tax file audit-readySave challans, AIS/Form 26AS extracts, notices and responses in one folder before filing or replying.

Open Calculators →

Official sources used

This article is intentionally source-limited to official Income Tax Department / e-Filing material. Verify final positions with the latest Act, Rules, notifications, circulars and portal utilities before publishing.

For the connected rule, example or next step, see Tax Credit Mismatch: TDS Shown Wrong or Missing.

FAQs

What happens if TDS is not deducted? ▾

Official guidance refers to interest consequences and possible disallowance under Section 40(a)(ia) where applicable.

What if TDS was deducted but not deposited? ▾

That can create interest and credit problems for the deductee.

Can TDS return mistakes be corrected? ▾

Yes, through the official TDS/TCS correction statement process.

Source and review trail

Use the current official instrument, portal or regulator publication before acting. This panel separates the category authority from page-specific references.

Primary category: Income Tax
Official starting point: www.incometax.gov.in

Page source links

For the connected rule, example or next step, see Dividend Income Tax and TDS 2026: Gross Income and Credit.