Depending on how your research is funded, you may need to consider your funder's open access policies and requirements for how your work is disseminated and made accessible. If your agency requires you to publish your research results in an open access journal, the necessary funding for OA fees themselves is something to take into consideration when applying for funding. In any event, remaining compliant with such policies is necessary so that you stay funded.
Another item to take into consideration is public access policies, which are distinct from open access policies. For example, NIH-funded medical researchers are required to submit and make funded research accessible via PubMed Central (PMC), regardless of whether the work was published in an open access journal or not.
Luckily, there are resources to help you pinpoint both public access and open access requirements and stay compliant: the resources here either feature directories of (and hyperlinks to) funding agencies' requirements or are searchable for such information.