Dear Concern,

Thank you for your email. BDTax.com.bd is Bangladesh first tax preparation software.First of all you need to create an account to prepare your taxes.
BDTax is a self guided software so it will instruct you to fill up the required field. So you need not to provide us any documents. Just collect the documents and prepare your taxes by yourself easily.

Please check this "How to video" it will make you clear about it.

https://www.youtube.com/watch?v=D2GTA3Mg5Fw

And about required documents you can find it in our website in "Download option". For a better clarification I am sending you the list of required documents those are needed to prepare your taxes in BDTax.com.bd.

http://prntscr.com/f5reas

Please check this out and let us know if you have any problem. We are here to assist you.

Thanks