OASPA member organisations pay the following dues. All dues are in Euros (EUR) and based on a calendar year.
| Professional Publishers (Small) | €300.00 |
| Professional Publishers (Medium) | €1,200.00 |
| Professional Publishers (Large) | €3,300.00 |
| Professional Publishers (Very Large) | €6,250.00 |
| Scholar Publishers | €75.00 |
| Supporting Services and Infrastructure (Commercial) | €600.00 |
| Supporting Services and Infrastructure (Non-Commercial) | €300.00 |
Size of Professional Publishing Organisations is determined by total annual publishing revenue (Small = below €500,000; Medium = between €500,000 and €5,000,000; Large = between €5,000,000 and €100,000,000; Very Large = above €100,000,000). More information about all membership categories can be found here.
New members joining OASPA after August 31st are charged half the yearly membership dues for that calendar year.