TDS Return Filing in Tax Year 2026-27: Due Dates, Corrections and Penalties CA Firms Should Track

The Q2 deadline for tax year 2026-27 falls on 31 October, and for most CA firms that means a fortnight of chasing challan details, PAN corrections and deductee breakups from clients who sent half their data in September. Getting tds return filing right is less about the upload itself and more about what happens before it: clean deduction data, the right form, and a defensible position when a mismatch notice arrives later. AskSolique, an AI tax research platform built for Indian CA firms, sees the same handful of problems repeat every quarter, and this guide walks through them in order.

One note before we start. The Income-tax Act, 2025 took effect from 1 April 2026, and it renumbered both the sections and the forms. The quarterly statement process is broadly the same, but the references your team writes in letters, working papers and replies have changed. Always confirm the current section numbers against the latest CBDT notification before quoting them to a client or an officer.

Quarterly Due Dates and Forms Under the New Act

For tax year 2026-27, the quarterly statement due dates for deductors other than government offices are widely reported as:

• Q1 (April to June 2026): 31 July 2026
• Q2 (July to September 2026): 31 October 2026
• Q3 (October to December 2026): 31 January 2027
• Q4 (January to March 2027): 31 May 2027

The familiar forms have new numbers. The salary statement that was Form 24Q is now reported as Form 138, the non-salary statement (old 26Q) as Form 140, and the non-resident statement (old 27Q) as Form 144, with TCS moving from 27EQ to Form 143. The TDS certificates have changed too: the new Act replaces Form 16 and Form 16A with new certificate forms. If your engagement letters, checklists or client reminders still say "24Q due on 31st", update them now. A client who reads an old form number in your email will assume you are working from an old playbook.

Deposit timelines have not moved in practice. Tax deducted in a month is still due by the 7th of the following month (March deductions follow the separate year-end timeline), and a late deposit still carries interest. Most quarterly filing problems actually start here, with a challan that was paid late or tagged to the wrong section.

The Five Errors That Cause Most Defaults

Across firms of every size, the same five issues account for most short-deduction and late-payment defaults on the TRACES side:

1. PAN errors or missing PAN. A single wrong character pushes the deduction to the higher rate on the default report, even when the correct rate was applied.
2. Challan mismatches. The BSR code, challan serial number or deposit date in the statement does not match the bank's record, so the challan is shown as unmatched or over-consumed.
3. Wrong section code. A professional fee booked under the contract code, or rent on plant booked as rent on building, creates a short-deduction default even when the total tax is correct.
4. Lower deduction certificates not quoted. If a deductee holds a certificate for a lower rate and the certificate number is not entered, the system treats the lower deduction as a shortfall.
5. Late deposit interest left unpaid. Interest for late payment is calculated automatically, and if it is not paid with the statement it shows up as a demand that the client discovers months later.

None of these are complicated, but they compound. A firm handling forty deductors a quarter cannot check every line by hand in the last week, which is why the review needs to start when the data arrives, not when the portal opens.

Correcting and Revising a Statement Already Filed

A large share of the queries CA firms get in October are not about the current quarter at all. They are about a statement filed months ago that now shows a default. Revising a filed statement follows a predictable sequence:

1. Download the justification report from TRACES and identify the exact default type: short payment, short deduction, late payment interest or late filing fee.
2. Request the consolidated file for the quarter, so you are correcting against what the department actually holds rather than your own working copy.
3. Prepare the correction statement in the return preparation utility, using the correct correction type (PAN update, challan update, deductee row addition and so on).
4. Validate it with the file validation utility, then upload it through the e-filing portal or a TIN facilitation centre.
5. After processing, download the revised justification report and confirm the default has actually cleared.

Two practical points save time here. First, get the correct PAN confirmed in writing from the deductee before you correct it, so you are not filing a second correction for the same row. Second, if the default stems from a genuine dispute over the rate or section rather than a typing error, the fix is not a correction statement. It is a written reply backed by the relevant law and rulings.

Late Fees, Penalties and When to Reply Instead of Pay

The cost of a late statement has two layers. The first is a daily late fee, reported at ₹200 for every day of delay and capped at the total tax deductible in the statement. The second is a separate penalty, commonly cited in the range of ₹10,000 to ₹1,00,000, for failing to file or for filing an incorrect statement. Under the old Act this penalty did not apply where the tax, interest and fee were paid and the statement was filed within one year of the due date, so check whether the same relief carries over before advising a client. Section numbers for both have changed under the 2025 Act, so check the current references before citing them.

Not every demand should simply be paid. A short-deduction default raised because the department applied a different section, or a penalty proposed where the statement was filed with a reasonable cause for delay, deserves a reasoned reply. That reply is far stronger when it quotes how tribunals and High Courts have treated similar facts. A searchable income tax case law database for India lets an associate find relevant rulings on reasonable cause, section classification or interest computation in minutes, instead of spending an afternoon scrolling through generic search results.

This is the same discipline that applies to any notice. We covered the broader approach in our guide on preparing a defensible response to an income tax scrutiny notice, and the principles carry straight over to TDS defaults: isolate the exact issue, collect the documents, and support the position with authority.

Building a TDS Workflow That Holds Up Every Quarter

The firms that file on time without a last-week scramble usually share three habits. They collect deduction data monthly rather than quarterly, so challan and PAN errors surface while there is still time to fix them. They keep a deductor-wise tracker that shows the challan status, the section split and any lower deduction certificates in one place. And they treat every default notice as a research task with a deadline, not a payment to be pushed through.

Technology helps most in the research and drafting layer. A team using AI built for chartered accountants can pull the governing provision, the matching rulings and a first draft of a reply in one pass, then spend its time on judgment rather than lookup. The goal is not to automate the filing itself but to free senior staff from the repetitive parts of explaining and defending it. If your firm is still deciding how far to take this, our earlier piece on where AI actually saves time in a CA firm, and where it does not sets out a realistic view, and our comparison of what CA firms should compare before choosing an AI tax research tool covers the selection side.

Quick Checklist Before You Upload

• Every deductee PAN verified, and higher-rate cases flagged with a reason.
• Every challan matched to the bank record by BSR code, serial number, date and amount.
• Section codes reviewed for professional fees, contracts, rent and commission.
• Lower deduction certificate numbers entered where applicable.
• Late deposit interest computed and paid before filing.
• Form numbers and section references updated to the Income-tax Act, 2025.
• Previous quarters' justification reports checked for open defaults.

Quarterly TDS work rewards firms that are organised early and well supported when something goes wrong. If your team wants to see how AskSolique handles TDS and income tax research, notice replies and case law in one workspace, contact us and we will set up a walkthrough for your firm.