https://www.epo.org/en/node/application-form-includes-different-budget

The application form includes different budget categories. In the event of a grant being awarded, is it possible to transfer some of the budget between categories due to unexpected changes? Is there any threshold for such changes?

Project expenses should conform to the approved budget proposal in section 8.7 of the application form. The budget lines can only be adjusted in exceptional cases, backed by solid reasons and subject to prior EPO approval.