The aim behind the move is to make it simpler and quicker for intermediaries to do business with the Society.
The form now features a checklist on the front page to ensure there is no need for returns in the case of incomplete data.
There are also more streamlined questions meaning that the form can be processed faster once it reaches the dedicated service centres at Nationwide.
Tim Hughes, head of intermediary markets at nationwide, said: "Nationwide has a strong commitment to the intermediary mortgage market and we are always looking for ways to offer excellent service. We know that clients want a hassle-free process as well as great low rates and affordable fees.
"With the form already having a positive impact on mortgage processing times, this is a definite step in the right direction towards bringing our service in line with our great value products."
