After completing his graduation in commerce, Deepak Aggarwal joined M/s R.A. Aggarwal & Associates a leading taxation consultancy firm of his father Shri R. A. Aggarwal Advocate. He worked hard to have in-depth knowledge and expertise of all facets of setting up new industrial units in Uttarakhand and started consulting his clients to their advantage. As new industrial policy came in 2003 in Uttarakhand he gained expert knowledge of Central Excise, Service Tax, DIC, Pollution Control Board provisions related to Uttarakhand State and provided consultancy to several industries to set up their units in Uttarakhand. During these years of training, he came out as a promising young professional.

After completing his LLB he started providing leading consultancy relating to slump sale, mergers, Drafting, deed writing, mobile squad litigations, etc.

In the year 2009 he got married to Sarika Aggarwal, a CA by profession. Being a CA she has extended her services to R.A. Aggarwal& Associates as an expert consultant

In VAT Act he has gained ample exposure of appeals up to tribunal. 

Since 01.07.2017 when the GST Act came into force, he is also providing GST consultancy on all legal and technical aspects. He is enrolled as GST Practitioner since December 2017.