Expenses of Pleasure Foreign Trip

Shubham Jain (35 Points)

12 March 2019  
Hello everyone,
My client (Major Son) recently went on a foreign trip(Non Business/ Pleasure), he will now make payment of expenses for that trip out of his father's bank account.

He has options

1 Either take a bill with gst paid or a simple invoice without gst

2 Either he can deposit funds directly in travel agent's account or make a ECS/ NEFT

What are other things that he should keep in mind?
Thank you