Due Date

A due date is a deadline. In the context of invoicing, the due date is the last day by which a buyer must pay an invoice before it is considered overdue. In the context of GST and taxation in India, due dates refer to the deadlines for filing returns such as GSTR-1 and GSTR-3B, making tax payments, and submitting statutory forms. Missing either type of due date has real consequences: a buyer who misses an invoice due date may face late payment fees, while a business that misses a GST filing due date faces interest, late fees, and penalties.

Quick reference

Invoice due date	Last day the buyer can pay without incurring a late fee
Calculated from	Invoice date plus the agreed credit period
Common examples	Net 15 = 15 days, Net 30 = 30 days, Net 60 = 60 days
GSTR-1 monthly due date	11th of the following month
GSTR-3B monthly due date	20th of the following month
GSTR-9 annual return due date	31st December of the following financial year
Interest on late GST payment	18% per annum from the due date
Late fee for GSTR-3B	Rs. 50 per day (Rs. 20 per day for nil returns)
MSME invoice payment due date	15 days (no agreement) or 45 days (with agreement)

How a due date works on an invoice

Here is how a due date is calculated and used on a standard Indian GST invoice:

1. You raise an invoice. A web developer in Bengaluru completes a project on 5th April and raises a GST invoice for Rs. 60,000 on the same day. The invoice date is 5th April.

2. You apply the agreed credit period. The developer and client agreed on Net 30 payment terms. The due date is therefore 5th May, which is 30 days after the invoice date.

3. The due date appears on the invoice. The developer writes "Payment due by 5th May 2026" clearly on the invoice, either near the total amount or in the payment terms section.

4. The buyer pays by the due date. If the client pays on or before 5th May, the invoice is settled with no late fees.

5. If the buyer misses the due date. If the client pays on 20th May instead, the payment is 15 days late. If the developer has a late payment clause of 1.5% per month in their agreement, they can charge Rs. 450 as interest for those 15 days.

Due date example for Indian businesses

Meena runs a graphic design studio in Pune. She invoices three clients in April:

Client	Invoice date	Payment terms	Due date	Paid on
Startup A	3rd April	Net 15	18th April	16th April (on time)
Agency B	10th April	Net 30	10th May	22nd May (12 days late)
Retailer C	20th April	Net 45	4th June	Not paid yet

Meena can charge late payment interest from Agency B for 12 days. For Retailer C, Meena should send a payment reminder immediately after 4th June and consider issuing a formal notice if payment is not received within a reasonable time.

Invoice due date vs invoice date

These two dates are different and both matter for a different reason:

	Invoice date	Due date
What it is	The date the invoice was created and sent	The deadline for payment
Determines	GST time of supply, IRP upload deadline	When a payment is overdue
Fixed by	The supplier at the time of billing	The agreed payment terms
GST impact	GST liability arises on this date	No direct GST impact
E-invoice rule	Invoice must be uploaded to IRP within 30 days of this date	No e-invoicing obligation

Important for GST compliance: Your GST liability arises on the invoice date, not the due date. Even if your buyer has 60 days to pay, you must report the invoice in GSTR-1 and pay the GST in the same month you raised the invoice. Many small businesses confuse invoice due date with GST payment due date and end up paying interest on late GST payment.

GST return due dates in India

Apart from invoice due dates, every GST-registered business must track these statutory due dates. Missing these attracts interest at 18% per annum on unpaid tax and late fees.

GSTR-1 (outward supplies)

Filer type	Due date
Monthly (turnover above Rs. 5 crore)	11th of the following month
Quarterly under QRMP scheme	13th of the month following the quarter

GSTR-3B (summary return and tax payment)

Filer type	Due date
Monthly (turnover above Rs. 5 crore)	20th of the following month
Quarterly QRMP (Category 1 states)	22nd of the month following the quarter
Quarterly QRMP (Category 2 states)	24th of the month following the quarter

PMT-06 (monthly tax payment for QRMP filers)

QRMP scheme taxpayers must pay estimated monthly tax using Form PMT-06 by the 25th of every month even though they file returns quarterly.

GSTR-9 (annual return)

All regular taxpayers with turnover above Rs. 2 crore must file GSTR-9 by 31st December of the financial year following the year being reported. For FY 2025-26, the due date is 31st December 2026.

GSTR-4 (composition scheme annual return)

Composition scheme taxpayers must file GSTR-4 by 30th April of the following financial year. For FY 2025-26, the due date is 30th April 2026.

Other important GST due dates

Form	Purpose	Due date
GSTR-7	TDS under GST	10th of following month
GSTR-8	TCS by e-commerce operators	10th of following month
GSTR-6	Input Service Distributors	13th of following month
CMP-02	Opt into composition scheme	31st March before the financial year
RFD-11 (LUT)	Letter of Undertaking for exporters	31st March before the financial year

The MSME invoice payment due date

Under Section 43B(h) of the Income Tax Act, effective from 1st April 2024, any business buying goods or services from a Micro or Small Enterprise registered under the MSMED Act must pay within:

• 15 days if there is no written agreement between buyer and seller
• 45 days if there is a written agreement, but the credit period cannot exceed 45 days

If a buyer misses this due date, the expense cannot be claimed as a tax deduction in that financial year. The deduction is only allowed in the year the payment is actually made.

How to write a due date clearly on your invoice

Many Indian small business owners write "Net 30" on their invoices, but many buyers do not know what this means. Here are better practices:

• Write the actual calendar date: "Payment due by 15th May 2026" is clearer than "Net 30"
• Place the due date prominently near the total amount and in the payment terms section
• Use bold text or a contrasting colour so the due date stands out
• If you have a late fee policy, mention it near the due date: "A late payment fee of 1.5% per month applies after this date"
• For repeat clients, state the due date in your service agreement as well, so there is no ambiguity

What happens when an invoice due date is missed

When a buyer misses a payment due date, the invoice becomes overdue. Here is how to handle it systematically:

1. Day 1 after due date: Send a polite payment reminder via email or WhatsApp. Most late payments in India are not intentional. A gentle reminder resolves the majority.

2. Day 7 to 15: Send a second reminder and reference the invoice number, amount, and original due date. Attach a copy of the invoice.

3. Day 15 to 30: Send a formal demand letter mentioning the late payment interest clause from your agreement.

4. Beyond 30 days: Consider escalating to a legal demand notice. For MSME-registered businesses, you can file a complaint on the MSME Samadhaan portal for delayed payments.

Common due date mistakes Indian businesses make

• Not writing any due date on the invoice. An invoice with no due date gives the buyer no clear deadline. Without a stated due date, it is hard to enforce late payment charges or pursue the buyer legally.

• Writing "Net 30" without explaining it. Many small Indian businesses and their clients do not understand abbreviations like Net 30. Write the actual date instead to eliminate confusion.

• Confusing invoice due date with GST payment due date. Your buyer's due date to pay you is separate from your due date to pay GST. You owe GST in the month of billing regardless of when your buyer pays.

• Extending credit periods beyond 45 days for MSME suppliers. If your supplier is MSME-registered and you agree to a credit period beyond 45 days, you lose the tax deduction benefit for that expense. Always keep MSME supplier payments within the legal limit.

• Not tracking overdue invoices. Many Indian freelancers and small businesses raise invoices and then forget to follow up when the due date passes. Using an invoice dashboard that highlights overdue invoices by due date prevents this.

Frequently asked questions

What is a due date on an invoice?

A due date on an invoice is the last day by which the buyer must make payment without incurring a late fee or being considered in default. It is calculated by adding the agreed credit period to the invoice date. For example, if an invoice is dated 1st April with Net 30 terms, the due date is 1st May.

What is the due date for GST return filing in India?

For monthly GSTR-1 filers, the due date is the 11th of the following month. For monthly GSTR-3B filers, the due date is the 20th of the following month. QRMP scheme filers have quarterly filing due dates. The annual return GSTR-9 is due by 31st December of the following financial year.

What happens if I miss a GST due date?

If you miss the GSTR-3B due date, you must pay a late fee of Rs. 50 per day (Rs. 20 per day for nil returns) up to a maximum of Rs. 10,000. Additionally, interest at 18% per annum is charged on any unpaid tax from the original due date. Repeated non-filing can result in suspension of your GSTIN.

Is the due date the same as the payment date?

No. The due date is when payment should be received. The payment date is when the buyer actually makes the payment. If a buyer pays on 12th May but the due date was 1st May, the due date is 1st May and the payment date is 12th May. The invoice is 11 days overdue.

Can I change the due date after sending an invoice?

Technically yes, if both you and your buyer agree. You can issue a revised invoice or simply communicate the new due date in writing. However, for GST purposes, the original invoice date stands and your GST liability does not change. Only the payment arrangement between you and your buyer is affected.

Related terms

Invoice · Credit Period · Payment Terms · Net 30 · Late Payment Fee · Accounts Receivable · GSTR-3B

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