Whether any penalty is payable, if the self-assessed tax or any amount collected as tax is not remitted

Yes. Penalty shall be leviable under section 73(11), where the self-assessed tax or any amount collected as tax is not paid within 30 days from the due date of payment of such tax. Quantum of penalty leviable shall be 10% of the tax or ` 10,000/-, whichever is higher.

(ICAI FAQ PUBLICATIONS 06-09-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts : FAQ NO. 8)

If the show cause notice is issued under section 73(1) or 73(3) and thereafter the person chargeable with tax makes payment, is there any need to adjudicate the case

No. Where the person chargeable with tax pays the tax along with interest under section 50 within 30 days of issue of such show cause notice, no penalty shall be payable The person chargeable with tax shall inform the proper officer of such payment in Form GST DRC-03 and the proper officer shall issue an order in Form GST DRC-05 concluding the proceedings in respect of the said notice. Please note that on such payment, all proceedings in respect of such notice except for proceedings under section 132 shall be deemed to be concluded.

(ICAI FAQ PUBLICATIONS 06-90-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts : FAQ NO. 6)

Whether the proper officer can proceed to issue show cause notice in case of any shortfall in payment under section 73(5) by the person chargeable with tax

Where the proper officer is of the opinion that the amount paid under section 73(5) falls short of the actual amount payable, he shall proceed to issue show cause notice under section 73(1) for such shortfall.

(ICAI FAQ PUBLICATIONS 06-09-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts : FAQ NO. 5)

Can the person chargeable with tax pay the amount of demand along with interest before the service of show cause notice under sub-section 73(1) or statement under section 73(3)

Yes. The person chargeable with tax can pay the amount of tax along with interest under section 50 based on his own ascertainment of such tax or the tax as ascertained by the proper officer and inform the proper officer in writing of such payment in Form GST DRC-03. On receipt of such information, the proper officer shall issue an acknowledgement for accepting the payment made by the said person in Form GST DRC-04 and shall not serve any notice or statement with respect to the tax so paid.

(ICAI FAQ PUBLICATIONS 06-09-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts: FAQ NO. 4)

Whether proper officer can issue similar show cause notice for any periods other than those covered under section 73(1)

Yes. The proper officer may serve a statement under section 73(3) along with a summary electronically in Form GST DRC-02 containing details of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized where the grounds relied upon by the proper officer for such periods are the same as are mentioned in the earlier notice issued under section 73(1). The service of such statement shall be deemed to be service of show cause notice on the person chargeable with tax.

(ICAI FAQ PUBLICATIONS 06-09-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts : FAQ NO. 3)

What is the time limit for issue of show cause notice by the proper officer under section 73(2)

The proper officer shall issue show cause notice at least 3 months prior to the time limit of 3 years for issuance of order i.e.
 Before completion of 3 years from the due date for furnishing of annual return for the financial year to which the tax not paid or short paid or input tax credit wrongly availed or utilized relates to, or
 within 3 years from the date of erroneous refund, as the case may be.

9ICAI FAQ PUBLICATIONS 06-09-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts : FAQ NO. 2)

Under what circumstances, the proper officer shall invoke provisions of section 73(1) to serve show cause notice on the person chargeable with tax

The proper officer shall serve notice under the provisions of Section 73(1) along with a summary, electronically in Form GST DRC-01 (as per Chapter XVIII-Demands and Recovery of the CGST Rules) on the person chargeable with tax for any reason other than:
 fraud
 willful misstatement
 suppression of facts,
when he has reasons to believe that tax has not been paid or short paid or erroneously refunded or input tax credit has been wrongly availed or utilized.

(ICAI FAQ PUBLICATIONS 06-09-2017 Determination of tax not paid or short paid or erroneously refunded or input tax credit wrongly availed or utilized for any reason other than fraud or any willful misstatement or suppression of facts: FAQ NO. 1)