A person registered under GST is required to furnish details of his business inward and outward supplies (purchases and sales) in the form of GST return which is furnished on a regular basis either monthly or quarterly.
Their are number of forms prescribed under the law for different different types of dealers. Default in filing return within time will lead to imposition of penalty. Also, their is no provision to revise the return, once filed. Hence, it is highly recommended to ensure that the data filed is true and correct by all means.
Filing returns all by yourself could be slightly tricky as with change in circumstances the disclosures made in the return are also affected. Further, under GST there is no such provision to revise a return hence it becomes all more important to ensure that the disclosures are made under the appropriate heads. Any discrepancy in furnishing the details in the rightful manner, can lead to dis-allowing of any claim or imposition of penalty by the Goods and Service tax Department.