Why am I not able to view the Mark as Filed option in the filing tab?

You will not be able to mark returns as filed if your organisation has an approval process for the transactions. To mark the returns as filed, you must first submit for approval in Zoho Books. To submit your returns for approval in Zoho Books:

1. Click GST Filing in the left sidebar.
2. Select the period for filing for your returns below the GST Summary for.
3. Navigate to the Push to GSTN tab next to the Overview tab.
4. Push all your transactions if you haven’t pushed them yet by clicking Push to GSTN.
5. Click Submit for Approval to submit the return for approval.