GST Checklist for Startups in Their First Year

Short answer: For startups in their first year, the essential GST checklist includes: obtaining GST registration upon crossing the turnover threshold (₹20 lakh for services, ₹40 lakh for goods), issuing GST-compliant tax invoices for all sales, filing monthly or quarterly returns (GSTR-1 and GSTR-3B) accurately and on time, and claiming eligible Input Tax Credit (ITC) on business expenses. Maintaining proper records is mandatory for compliance and audits.

When do I need to get GST registration?

You must register for GST once your aggregate annual turnover exceeds the prescribed threshold. For most startups providing services across India, this limit is ₹20 lakh. For those exclusively supplying goods, the limit is ₹40 lakh. However, registration is mandatory irrespective of turnover in certain cases, such as making inter-state supplies, selling on e-commerce platforms like Amazon or Flipkart, or being liable under the reverse charge mechanism. It's crucial to monitor your turnover from day one.

Read our detailed guide on GST Registration Eligibility

What is the GST registration process?

The GST registration process is entirely online via the official GST portal. You will need your PAN, a valid mobile number, and an email address to start. The process involves submitting an application in Form GST REG-01, along with scanned copies of required documents like proof of business constitution (e.g., Certificate of Incorporation for companies), proof of place of business (e.g., rent agreement), and identity/address proof of promoters. Once submitted, an officer will review the application and may grant registration or ask for clarification. The process usually takes 7-10 working days.

How do I issue a GST-compliant invoice?

You must issue a 'Tax Invoice' for every taxable supply, as mandated by Section 31 of the CGST Act, 2017. A compliant invoice is not only a legal requirement but also essential for your B2B customers to claim Input Tax Credit (ITC). Failure to issue proper invoices can lead to disputes and penalties.

Mandatory Field on a Tax Invoice	Description
Invoice Number & Date	A unique, consecutive serial number and the date of issue.
Customer Details	Name, address, and GSTIN of the recipient (if registered).
Your Details	Your business name, address, and GSTIN.
HSN/SAC Code	Harmonized System of Nomenclature (for goods) or Service Accounting Code.
Description of Goods/Services	Clear description of what is being sold.
Quantity & Unit	Quantity of goods and the unit (e.g., pcs, kgs).
Taxable Value & Discounts	Total value before taxes, showing any discounts.
Tax Rates & Amounts	CGST, SGST/UTGST, and IGST rates and the corresponding tax amounts shown separately.
Place of Supply	The state where the supply is deemed to have occurred.
Signature	Signature or digital signature of the supplier or their authorised representative.

If you are registered under the composition scheme or supply only exempt goods/services, you must issue a 'Bill of Supply' instead of a Tax Invoice.

What are the key GST returns I need to file?

Filing returns is a core GST compliance activity. For a regular taxpayer, the primary returns are GSTR-1 (details of outward supplies) and GSTR-3B (a summary return for tax payment). Most new startups with turnover up to ₹5 crore can opt for the QRMP (Quarterly Return Monthly Payment) scheme, allowing them to file these returns once a quarter.

Return Form	Purpose	Frequency (Regular Taxpayer)	Due Date
GSTR-1	Statement of all outward supplies (sales).	Monthly	11th of the next month
GSTR-3B	Summary return for calculating and paying net GST liability.	Monthly	20th of the next month
GSTR-9	Annual Return, consolidating all monthly/quarterly returns.	Annually	31st December of the next financial year
GSTR-9C	Reconciliation Statement (self-certified).	Annually	31st December of the next financial year

Note: Taxpayers under the QRMP scheme file both GSTR-1 and GSTR-3B quarterly but must pay tax monthly.

What is Input Tax Credit (ITC) and how can my startup claim it?

Input Tax Credit (ITC) is the heart of the GST system, allowing you to reduce your tax liability by claiming credit for the GST paid on your business inputs. For example, the GST you pay on office rent, software purchases, or professional fees can be set off against the GST you collect on your sales. To claim ITC under Section 16 of the CGST Act, you must satisfy all the following conditions:

1. You must possess a valid tax invoice or debit note.
2. You must have received the goods or services.
3. The tax charged on your purchase has been paid to the government by your supplier (verifiable via Form GSTR-2B).
4. You have filed your GST return (Form GSTR-3B).

Be aware of 'blocked credits' under Section 17(5), which disallows ITC on certain expenses like food and beverages, club memberships, and most motor vehicles.

Learn more about Input Tax Credit Rules

Should my startup choose the Composition Scheme?

The Composition Scheme is a simplified tax regime for small businesses with an aggregate turnover of up to ₹1.5 crore (₹75 lakh for certain states). Under this scheme, you pay tax at a low, fixed percentage of your turnover (e.g., 1% for traders, 6% for service providers) and file a simple quarterly statement. However, the scheme has significant drawbacks: you cannot collect tax from your customers, and you are not eligible to claim ITC on your purchases. This makes your supplies unattractive to B2B clients who need to claim ITC. It is generally suitable only for B2C businesses with low margins.

Compare schemes with our guide on the GST Composition Scheme

Worked example

Let's consider 'Innovatech Solutions Pvt. Ltd.', a new software consulting startup in Bengaluru, Karnataka.

1. Turnover & Registration: In their first financial year (FY 2026-27), their turnover from services is as follows:

   • Q1 (Apr-Jun): ₹9,00,000
   • Q2 (Jul-Sep): ₹12,00,000 Their aggregate turnover crosses the ₹20 lakh threshold in September 2026. They must apply for GST registration within 30 days of crossing this limit.

2. Invoicing & Output Tax: In October 2026, after getting their GSTIN, they raise an invoice on a client in Mumbai for a project.

   • Service Value: ₹2,00,000
   • As this is an inter-state supply (Karnataka to Maharashtra), IGST @ 18% is applicable.
   • IGST Amount: ₹2,00,000 * 18% = ₹36,000
   • Total Invoice Value: ₹2,36,000 Their total output tax for October is ₹36,000.

3. ITC Claim & Net Tax: In the same month, they purchase new laptops for the office from a local Bengaluru dealer.

   • Laptops Cost: ₹1,20,000
   • As this is an intra-state purchase, CGST and SGST @ 9% each are applicable.
   • CGST: ₹10,800
   • SGST: ₹10,800
   • Total ITC available: ₹21,600 (₹10,800 CGST + ₹10,800 SGST)

4. Tax Payment in GSTR-3B:

   • Output IGST: ₹36,000
   • Input CGST available: ₹10,800
   • Input SGST available: ₹10,800
   • As per ITC utilisation rules, IGST credit must be used first to pay IGST liability. Here, there is no IGST credit, so CGST and SGST credit can be used to pay IGST liability.
   • Net IGST Payable: ₹36,000 - ₹10,800 (from CGST) - ₹10,800 (from SGST) = ₹14,400 Innovatech will pay ₹14,400 to the government while filing their GSTR-3B for October.

Common mistakes

1. Delaying Registration: Waiting too long after crossing the turnover threshold can attract interest and penalties on taxes not paid from the due date of registration.
2. Incorrect Invoicing: Issuing invoices without mandatory details, especially a valid GSTIN or correct HSN/SAC codes, can cause your clients to lose ITC and damage business relationships.
3. Mismatch in ITC Claims: Claiming ITC for invoices not appearing in your Form GSTR-2B is a primary reason for receiving departmental notices. Always reconcile your purchase register with GSTR-2B.
4. Not Filing NIL Returns: Even if your startup has no sales or purchases in a tax period, you must file a NIL GSTR-1 and GSTR-3B. Non-filing leads to a cascading effect of late fees.
5. Incorrect Tax Application: Charging CGST/SGST on an inter-state sale instead of IGST, or vice versa. This requires correction and can lead to cash flow issues.

How SP & SC helps

Navigating GST compliance can be a significant drain on a founder's time and resources. SP & SC Legal and Taxation Services provides end-to-end GST solutions for startups, from initial GST registration and return filing to strategic advisory on complex issues like ITC claims, e-invoicing implementation, and responding to departmental notices. We ensure your business remains 100% compliant so you can focus on growth, not paperwork.

Frequently asked questions

Can I claim GST on expenses incurred before registration?

Yes, under Section 18(1)(a) of the CGST Act, you can claim ITC on inputs held in stock and inputs contained in semi-finished or finished goods held in stock on the day immediately preceding the date you become liable to pay tax. This claim must be made in Form GST ITC-01 within 30 days of becoming eligible.

What is the penalty for late GST filing?

A late fee is levied under Section 47 for delayed filing of returns like GSTR-1 and GSTR-3B. It is typically ₹50 per day (₹25 CGST + ₹25 SGST), capped at a certain amount depending on turnover. For NIL returns, the fee is lower. Additionally, interest @ 18% per annum is payable under Section 50 on the tax amount that is paid late.

My startup only sells through Amazon/Flipkart. Do I need GST?

Yes. As per Section 24(ix) of the CGST Act, any person supplying goods or services through an e-commerce operator is required to get GST registration, regardless of their annual turnover. There is no threshold exemption for e-commerce sellers.

What is the difference between GSTIN and GSTN?

GSTIN stands for Goods and Services Tax Identification Number. It is the unique 15-digit PAN-based registration number assigned to every taxpayer. GSTN stands for Goods and Services Tax Network, which is the non-profit, non-government company that manages the entire IT infrastructure of the GST system in India.

Do I need a separate bank account for GST?

No, the GST law does not mandate a separate bank account. However, it is highly recommended as a best practice for financial discipline. A separate business account makes it much easier to track business transactions, manage cash flow, and simplify accounting and reconciliation for GST purposes.

Get a fixed-fee quote

If you're starting up and need clarity on GST, or require assistance with registration, filing, or any other tax matter, we're here to help. Share your documents with us for a confidential review, and we will provide a written fixed-fee quote for our services. You can Contact SP & SC or WhatsApp us at +91 90356 74566. We handle the entire process end-to-end, letting you focus on your core business.