GSTR-1 is the returnfor reporting details of all outward suppliesand also for reporting debit and credit notes issued. In short, return for reporting all sales transactions made during a tax period.
WHO : To be filed by all regularGST taxpayers.
FREQUENCY : It is to be filed monthly, except in the case of small taxpayers with turnover up to Rs.1.5 crore, who can file the same on a quarterly basis.
DUE DATE : 11th of the following month

GSTR-2A is the return containing details of all inward supplies of goods and services i.e. purchases made from registered suppliers during a tax period. The data is auto-populated based on data filed by the suppliers in their GSTR-1 return. GSTR-2A is a read-only return and no action can be taken.

GSTR-2 is the return for reporting details of all inward supplies. In short, return for reporting all purchases made during a tax period.
WHO : To be filed by all regularGST taxpayers.
DUE DATE : SUSPENDED

GSTR-3 is a monthly summary return for furnishing summarized details of all outward supplies made, inward supplies received and input tax credit claimed, along with details of the tax liability and taxes paid.
WHO : To be filed by all regularGST taxpayers.
DUE DATE : SUSPENDED

GSTR-3B is a monthly self-declaration to be filed, for furnishing summarized details of all outward supplies made, input tax credit claimed, tax liability ascertained and taxes paid.
WHO : To be filed by all regularGST taxpayers.
FREQUENCY : It is to be filed monthly
DUE DATE : 20th of the following month

GSTR-4 is a self declarationto be filed by taxpayers who have opted for the Composition Scheme under GST.
WHO : To be filed by all CompositionGST taxpayers.
FREQUENCY : It is to be filed quarterly
DUE DATE : 18h of the month following quarter end

GSTR-4 is a yearly return to be filed by taxpayers who have opted for the Composition Scheme under GST.
WHO : To be filed by all CompositionGST taxpayers.
FREQUENCY : It is to be filed annually
DUE DATE : 30th April of the next Financial year

GSTR-5 is the return to be filed by non-resident foreign taxpayers, who are registered under GST and carry out business transactions in India. The return contains details of all outward supplies made, inward supplies received, credit/debit notes, tax liability and taxes paid.
WHO : To be filed by all non-resident foreign GST taxpayers
FREQUENCY : It is to be filed monthly
DUE DATE : 20th of the following month

GSTR-6 is a monthly return to be filed by an Input Service Distributor (ISD). It will contain details of input tax credit received and distributed by the ISD. It will further contain details of all documents issued for the distribution of input credit and the manner of distribution.
WHO : To be filed by all Input Service Distributor
FREQUENCY : It is to be filed monthly
DUE DATE : 13th of the following month

GSTR-7 is a return to be filed by persons required to deduct TDS (Tax deducted at source) under GST. GSTR 7 will contain details of TDS deducted, the TDS liability payable and paid and TDS refund claimed, if any.
WHO : To be filed by all persons required to deduct TDS
FREQUENCY : It is to be filed monthly
DUE DATE : 10th of the following month

GSTR-8 is a return to be filed by e-commerce operators registered under the GST who are required to collect tax at source (TCS). GSTR-8 will contain details of all supplies made through the E-commerce platform, and the TCS collected on the same.
WHO : To be filed by all e-commerce operators
FREQUENCY : It is to be filed monthly
DUE DATE : 10th of the following month

GSTR-9 is the annual return to be filed by regular taxpayers registered under GST.
WHO : To be filed by all regular GST taxpayers
FREQUENCY : It is to be filed annually. (GST Council meeting took the decision to make GSTR-9 filing optional for businesses with turnover up to Rs.2 crore in FY 17-18 and FY 18-19 )
DUE DATE : 31st December of next financial year

GSTR-9A is the annual return to be filed by taxpayers who have registered under the Composition Scheme.
WHO : To be filed by all composition GST taxpayers
FREQUENCY : It is to be filed annually. (GST Council meeting took the decision to waive off GSTR-9A filing for FY 17-18 and FY 18-19 )

GSTR-9C is the reconciliation statement to be filed by all taxpayers registered under GST whose turnover exceeds Rs.2 crore in a financial year. The registered person has to get their books of accounts audited by a Chartered/Cost Accountant. The statement of reconciliation is between these audited financial statements of the taxpayer and the annual return GSTR-9 that has been filed.
WHO : To be filed by all GST taxpayers having turnover more than Rs.2 crore in a financial year
FREQUENCY : It is to be filed annually.

GSTR-10 is to be filed by a taxable person whose registered has been cancelled or surrendered. This return is also called a final return.
FREQUENCY : It is to be filed once, when GST Registration is cancelled or surrendered
DUE DATE : Within three months of the date of cancellation or date of cancellation order, whichever is later.

GSTR-11 is the return to be filed by persons who have been issued a Unique Identity Number(UIN) in order to get a refund under GST for the goods and services purchased by them in India. GSTR-11 will contain details of inward supplies received and refund claimed.
FREQUENCY : It is to be filed monthly