Legally, egg donors receive their compensation at the end of the cycle, but if they do it privately for example in the UK, they usually expect an additional fee at the beginning. In the USA, they are usually paid 10% of the agreed sum right after signing the agreement and 15% once accepted by the clinic.
Read the full article on: What Is The Financial Compensation For Donating Eggs? ( 71).

Rebeca Reus
BSc, MSc
Degree in Human Biology (Biochemistry) from the Pompeu Fabra University (UPF). Official Master's Degree in Clinical Analysis Laboratory from the UPF and Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV).