GSTR-1 Monthly Filing: 11th Deadline And Why Late Filing Cascades To Block GSTR-3B

India's compliance calendar tightens sharply in the second week of June 2026, and the single date that decides whether thousands of businesses keep their input-tax-credit chain unbroken is 11 June. That is the statutory due date for monthly GSTR-1 outward-supply returns covering the May 2026 tax period. Miss it, and the consequences are not merely a per-day late fee — under Rule 59(6) of the CGST Rules, a pending GSTR-1 freezes your GSTR-3B for the same month, halting the entire return cycle. For the trading day of 2 June 2026 and the week that follows, this is the compliance event to mark first, sitting alongside the Reserve Bank of India's Monetary Policy Committee meeting scheduled for 3-5 June 2026.

This watchlist breaks down the statutory deadlines, the market events that move rates and indices, the earnings backdrop, and the practical questions filers ask every June.

Statutory Deadlines

The GSTR-1 return reports every outward supply — B2B invoices, B2C summaries, credit and debit notes — for the tax period. Monthly filers must submit it by the 11th of the following month, which places the May 2026 return at 11 June 2026. Businesses on the Quarterly Return Monthly Payment (QRMP) scheme follow a different clock: their quarterly GSTR-1 is due on the 13th of the month following the quarter end, so the April-June 2026 quarter return falls on 13 July 2026, with an optional Invoice Furnishing Facility (IFF) available for the first two months.

The late fee is the first cost of slippage. Under the combined CGST and SGST levy, a delayed GSTR-1 attracts Rs 50 per day (Rs 25 each under the central and state Acts), reduced to Rs 20 per day for a nil return (Rs 10 each). These are capped, but the per-day clock starts on 12 June 2026 for the May period and runs until the return is filed.

The more expensive consequence is structural. Rule 59(6) of the CGST Rules, 2017 blocks the filing of GSTR-3B for a tax period if the GSTR-1 for that same period is outstanding. Because GSTR-3B for May 2026 is itself due on 20 June 2026 for monthly filers, a GSTR-1 left pending past 11 June compresses the window to clear both returns and pay the net tax. The CGST Act and Rules are published on indiacode.nic.in for the exact statutory text.

There is a second compliance event in the same week that businesses and individuals should not overlook. The first instalment of advance tax for the assessment year 2027-28 (financial year 2026-27) is due on 15 June 2026, requiring payment of 15 per cent of the estimated annual liability under Section 211 of the Income-tax Act. The full quarterly schedule is published on incometax.gov.in. You can model your instalment with the Oquilia advance tax calculator, and read the underlying concept in the advance tax glossary entry.

The downstream effect is what makes GSTR-1 timing a relationship issue, not just a personal one. Once filed, GSTR-1 auto-populates the buyer's GSTR-2B statement, and a recipient can claim input tax credit only on invoices that appear there — the condition codified in Section 16(2)(aa) of the CGST Act, effective since 1 January 2022. A supplier who files late on 12 June pushes the credit into the buyer's next 2B cycle, delaying the recipient's working capital. The HSN summary table is mandatory in GSTR-1, and e-invoicing applies to every B2B transaction where aggregate turnover exceeds Rs 5 crore.

Market Events

The headline event for the week of 2 June 2026 is the Reserve Bank of India's bi-monthly Monetary Policy Committee meeting, scheduled for 3-5 June 2026, with the rate decision announced on the morning of 5 June. The repo rate currently stands at 5.25 per cent, held unchanged at the 6-8 April 2026 review — the second consecutive pause after the February 2026 hold. Over the course of 2025 the MPC delivered cumulative cuts of 125 basis points, bringing the rate down from 6.50 per cent to 5.25 per cent, so the market enters this meeting watching for whether the easing cycle resumes or the pause extends.

The supporting policy corridor frames how money-market rates will settle around any decision. The Standing Deposit Facility (SDF) sits at 5.00 per cent, the Marginal Standing Facility (MSF) and Bank Rate at 5.50 per cent, leaving a 50 basis-point corridor on either side of the repo rate. At the April review, Governor Sanjay Malhotra flagged West Asia geopolitical risk and Brent crude above USD 100 per barrel as the reasons for caution. The official resolution and minutes are published on rbi.org.in for verification against any market commentary.

Two projections anchor the rate debate. The RBI's April resolution pencilled in CPI inflation of 4.6 per cent for FY27, with a forecast peak of 5.2 per cent in the third quarter, and trimmed GDP growth for FY27 to 6.9 per cent. A neutral stance, as confirmed in April, gives the committee room to move in either direction on 5 June, which is why floating-rate borrowers on External Benchmark Lending Rate (EBLR) loans should watch the announcement closely — any change typically resets EMIs within roughly three months. Equity desks, meanwhile, treat the rate decision as a direct input into banking and rate-sensitive sectors.

For investors who tie systematic contributions to month-start dates, the policy week is a useful checkpoint rather than a trigger to time the market. A first-of-month systematic investment plan instalment is governed by your goal horizon, not by a single MPC outcome — you can sanity-check the maths with the Oquilia SIP calculator before adjusting any standing instruction.

Earnings

The Q4 FY 2025-26 results season, which runs heaviest through late April and May, has largely wound down by the first week of June 2026. The editorial briefing for this watchlist confirms no specific company results scheduled for 2 June 2026, and in keeping with a zero-hallucination policy we will not list an earnings calendar that has not been verified. What June reliably brings instead is the corporate-governance calendar.

Under Section 96 of the Companies Act, 2013, every company other than a one-person company must hold its annual general meeting within six months of the financial-year close — by 30 September 2026 for a 31 March 2026 year-end. June and July are therefore when boards begin notifying record dates for final dividends and AGM schedules, each disclosed to the stock exchanges. The statutory text is available on indiacode.nic.in, and the Ministry of Corporate Affairs filings sit on mca.gov.in.

For shareholders, the number that matters is the record date attached to any declared final dividend, because it determines eligibility. Rather than chase unconfirmed results, investors tracking compounding should focus on reinvestment discipline: a step-up in annual contributions often outweighs a single quarter's earnings surprise, a trade-off you can quantify with the step-up SIP calculator. Where a GST-registered business is reconciling output tax before the 11 June filing, the GST calculator helps separate the tax component from invoice value.

FAQ

What is the GSTR-1 due date for May 2026?

For monthly filers, GSTR-1 for the May 2026 tax period is due on 11 June 2026. QRMP scheme filers report the April-June 2026 quarter by 13 July 2026, with an optional Invoice Furnishing Facility for the first two months of the quarter.

Why does late GSTR-1 block my GSTR-3B?

Rule 59(6) of the CGST Rules, 2017 prohibits filing GSTR-3B for a tax period while the GSTR-1 for the same period remains pending. Because GSTR-3B for May 2026 is due on 20 June 2026, a delayed GSTR-1 narrows the window to file both and pay the net tax.

What is the late fee for delayed GSTR-1?

The combined CGST and SGST late fee is Rs 50 per day for a return with outward supplies and Rs 20 per day for a nil return. The per-day charge begins the day after the 11 June 2026 due date and accrues until the return is filed, subject to the prescribed cap.

How does my late filing affect my buyer's input tax credit?

GSTR-1 auto-populates the buyer's GSTR-2B, and under Section 16(2)(aa) of the CGST Act a recipient can claim input tax credit only on invoices reflected there. Filing after 11 June 2026 can push the credit into the buyer's following 2B cycle, delaying their entitlement.

Is the RBI expected to change rates on 5 June 2026?

The MPC meets on 3-5 June 2026 with the repo rate at 5.25 per cent, held since 8 April 2026 under a neutral stance. The decision is announced on 5 June; verify the outcome against the resolution published on rbi.org.in rather than relying on forecasts.

When is the first advance tax instalment due?

The first instalment for financial year 2026-27 is due on 15 June 2026, covering 15 per cent of the estimated annual liability under Section 211 of the Income-tax Act, as detailed on incometax.gov.in.

What turnover triggers mandatory e-invoicing for GSTR-1?

E-invoicing is mandatory for B2B supplies where aggregate annual turnover exceeds Rs 5 crore. The HSN summary table in GSTR-1 is mandatory for all filers regardless of turnover.