How much is taxable if 100% is withdrawn from nps?

As per Budget 2017  partial withdrawals from NPS will be tax free. 
Before this partial withdrawals were taxable. 

PFRDA (Pension Fund regulatory and development authority) allows the Partial withdrawal from NPS up to 25% of contribution made by subscriber. 

However partial withdrawal is allowed subject to fulfillment of certain conditions as below:

•    The Partial withdrawal shall be allowed for specific purposes such as higher education of children, marriage of children, purchase or construction of residential house or for treatment of specified diseases.
•    Individual should have subscribed to NPS for at least 10 years.
•    Maximum of 3 withdrawals during the entire tenure are allowed.
•    Minimum gap of 5 years is required between the two withdrawals. However, this condition shall not apply in case of withdrawal for treatment of specified illness.

Withdrawal on retirement/at the age of 60- Withdrawal up to 40% of the accumulated wealth in NPS is exempt from tax at the time of retirement. However maximum amount that you can withdraw at the retirement is 60% of the accumulated wealth and balance 40% needs to be utilized for the purchase of annuity providing monthly pension to the subscriber.