Can i file March 23 sales invoice in May 23?

No You can't

Any specific reason for this? As someone told me that we can file the invoices up to 6 months from issue date.

Yes you can .
As per the proviso Section 37(3) of CGST Act any rectification or omissions an be rectify in GSTR 1 is allowed till November 23 following the end of FY. & the same provision being provided under Section 39(9) for GSTR3B return also.
So yes definitely you can report March 23 bill in May 23 return.

Note : As per Section 50 you are liable to pay interest @ 18% pa

You cannot do so.

If not, please give reason and under which section it is restricted?

Please provide some reason or section under which it is prohibited.

Invoice issue validity is 30 days. payment date is may 23, supplier not filled it in Gstr 1,the supplier may filled in next gstr 1 return alongwith invoice details of amendment . interest may levied on his part amount (profit)only because ITC of which goods may claimed by the supplier previouly.

For this purpose the supplier may issue a debit note and recipient may issue a credit note,if he is s registered taxpayer.unless the supplier issue a credit note.

I have already mentioned the section under which you can rectify such omissions. 

@ Sabhyasachi

Plz let us not know the section that reply is based on  For your kind information in this regard there was circular No.26/26/2017 GST issued giving clarification on such rectification.

@ Dear Amol Patil

You can definitely do so & I have replied with all the relevant sections & circular in this regard.  

So do go for the same without any further confusion. 

Time of supply of goods is earliest of:

1. Date of issue of invoice

2. Last date on which invoice should have been issued

3. Date of receipt of advance/ payment

You have issued invoice in March 2023. It shall be shown in GSTR-1 and GSTR-3B of March. Payment shall be made accordingly. If you missed out to shown / did not show in GSTR-1, then you may include the same in May 2023. Interest @ 18% will be applicable only if GST liability is not discharged within the due date. But, ITC can be claimed by the recipient only when it is reflected in GSTR-2B and in your case it will be by May 2023

 

In general, it's recommended to issue and file sales invoices in the same accounting period as the transaction took place. This ensures accurate financial reporting and compliance with accounting principles and tax regulations. If you issued a sales invoice on March 23, it would typically be recorded in the accounting period corresponding to March.

However, accounting practices may vary depending on your jurisdiction and specific circumstances. There could be certain exceptions or provisions that allow for adjustments or corrections to be made in subsequent periods. It's best to consult with an accountant or tax professional who is familiar with your local regulations to determine the appropriate course of action in your specific case.

Keep in mind that timely and accurate financial reporting is crucial for maintaining the integrity of your business's records navigation Buoys and complying with tax laws.