For India, the October 2026 calendar includes GST filings and payments for September or the July–September quarter, plus a revised 21 October deadline for certain AY 2026-27 audit reports. The related income-tax return deadline for the same specified class is now 21 November, not 31 October. GST dates vary by return type, filing frequency, turnover and state category; this calendar does not establish a complete income-tax TDS/TCS schedule.
October 2026 tax due dates in India
The GST dates below are listed in Shahi & Co.’s FY 2026–27 calendar. Income-tax extension dates are from the Income Tax Department’s update published on 29 September 2026. Check for later notifications and confirm the applicable date on the relevant official portal before filing.
| Date | Form or obligation | Who and period | Qualification |
|---|---|---|---|
| 11 October | GSTR-1 | Monthly regular filers; September 2026 | Ordinary monthly due-date pattern; check for an extension. |
| 13 October | GSTR-1 IFF | QRMP filers; July–September 2026 quarter | Invoice Furnishing Facility date listed in the FY 2026–27 calendar. |
| 18 October | CMP-08 | Composition dealers; July–September 2026 quarter | Date listed in the FY 2026–27 calendar. |
| 20 October | GSTR-3B | Monthly filers with turnover above ₹5 crore; September 2026 | Date listed in the FY 2026–27 calendar. |
| 20 October | PMT-06 | QRMP filers; September 2026 tax challan | QRMP uses quarterly returns with monthly challan payments. |
| 21 October | Income-tax audit report for AY 2026-27 | Only the person class specified at Sl. No. 2 under Explanation 2 to section 139(1) of the Income-tax Act, 1961 | Extended from 30 September by CBDT Circular No. 07/2026, as reported by the Income Tax Department on 29 September. |
| 22 October | GSTR-3B | September 2026; taxpayers with turnover up to ₹5 crore in the designated Category 1 states | Confirm state category and filing status. |
| 24 October | GSTR-3B | September 2026; taxpayers with turnover up to ₹5 crore in the designated Category 2 states | Confirm state category and filing status. |
| 28 October | GSTR-7 | Government bodies and notified GST TDS deductors; September 2026 | GST TDS return, not an income-tax TDS filing. |
| 28 October | GSTR-8 | E-commerce operators collecting GST TCS; September 2026 | GST TCS statement, not an income-tax TCS filing. |
| 31 October | GSTR-5 | Non-resident taxable persons; September 2026 | Date listed in the FY 2026–27 calendar. |
| 31 October | GSTR-6 | Input Service Distributors; September 2026 | Date listed in the FY 2026–27 calendar. |
| 21 November | Income-tax return for AY 2026-27 | Only the person class specified at Sl. No. 2 under Explanation 2 to section 139(1) of the Income-tax Act, 1961 | Moved from 31 October by the Income Tax Department’s 29 September update. |
Who gets the revised income-tax audit and return deadlines?
The Income Tax Department’s 29 September 2026 update, referring to CBDT Circular No. 07/2026 dated 28 September, extends the AY 2026-27 audit-report deadline from 30 September to 21 October and the related return deadline from 31 October to 21 November. Both changes apply to the persons identified at Sl. No. 2 in the table below Explanation 2 to section 139(1) of the Income-tax Act, 1961.
This is not a blanket extension for every taxpayer required to obtain an audit. Check the statutory class covered by the notice before relying on either revised date. A 2026 Grant Thornton calendar also lists 31 October obligations, including tax audit reports for transfer-pricing cases; it should not override the later Department update where that update applies.
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How to choose the correct GST date
GSTR-1 and IFF
GSTR-1 reports outward supplies. The GST Portal’s general guidance gives the ordinary deadline as the 11th of the succeeding month for monthly filers and the 13th after the quarter for quarterly filers, subject to government extension. Eligible taxpayers with turnover up to ₹5 crore may opt for quarterly filing. QRMP filers can use IFF for eligible invoice details during the first two months of a quarter; the October IFF date in this calendar relates to the July–September quarter.
GSTR-3B and PMT-06
Monthly GSTR-3B filers with turnover above ₹5 crore have a 20 October date for September in the FY 2026–27 calendar. For taxpayers up to ₹5 crore, that calendar assigns 22 October or 24 October according to its Category 1 and Category 2 state groupings. Confirm the applicable category and the taxpayer’s filing arrangement rather than applying one date to every state or turnover band.
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QRMP means quarterly GSTR-1 and GSTR-3B returns with tax paid monthly by challan. The calendar lists 20 October for the September PMT-06 challan; QRMP filers should not substitute the monthly GSTR-3B dates for that challan date.
Other GST forms
The calendar also lists October dates for composition dealers’ CMP-08, GST TDS deductors’ GSTR-7, e-commerce operators’ GSTR-8, non-resident taxable persons’ GSTR-5 and Input Service Distributors’ GSTR-6. The relevant taxpayer type and reporting period are shown in the date table.
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Income-tax TDS and TCS: what this calendar can confirm
GSTR-7 and GSTR-8 are GST obligations. They do not establish the payment, statement, certificate or challan-cum-statement deadlines for income-tax TDS or TCS. A complete October 2026 income-tax TDS/TCS schedule is not established here, so check the live Income Tax Department calendar and applicable CBDT updates for the specific obligation and deductor rather than relying on an inferred date.
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Before filing
- Match the form to the tax authority: GST forms and income-tax obligations follow separate calendars.
- For GST, confirm monthly, quarterly or QRMP status, the reporting period, turnover band and applicable state category.
- For the AY 2026-27 income-tax extension, confirm that the taxpayer belongs to the class named in the Department’s notice.
- Check for later GST or income-tax notifications before submitting. Shahi & Co.’s GST calendar warns that CBIC notifications can change dates; the GST Portal’s general filing guidance does not guarantee that no later October-specific extension was issued.
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