The Federal Budget for 2015-16 can be accessed at the Ministry of Finance’s website here
Those interested in reading the 127-pages-long Finance Act of 2015, which is the taxation measures that the Government of Pakistan will seek to introduce in the federal budget for 2015-16, can access it here.

Similarly, the full text of the Finance Minister Ishaq Dar’s budget speech in Parliament which lasted for over two hours on June 5 can be accessed here
The salient features of the government’s tax proposals can be read here