We recommend that you become a PMI member. However, you can either become a PMI member before starting your PMP application or you can add the PMI membership once your application is approved and you are ready to pay for your exam.
When you add a PMI membership, the exam fee that is charged will be the reduced member fee!
The benefit of becoming a PMI member is that you can download the PMBoK and other standards free. You can also access a wide range of articles and other valuable information.
Check the PMI website for the current fees. As of 15th May 2020, the membership fee was $139 USD and the Member exam fee was $405 USD. The exam fee alone as a NON-MEMBER is $555 USD.
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