TransferBOOST (Bachelor's Opportunity Options that are Straightforward and Transparent) is a multi-year state-level initiative developed to provide students with affordable, quality, well-supported two- to four-year pathways. Affordability matters a great deal for transfer students, but it has typically not been understood or prioritized. The IHEP and HCM teams joined forces with rpk GROUP to offer technical assistance to TransferBOOST institutions and state partners to make strategic finance and college affordability a signature feature of the initiative. The second brief in the series outlines the steps partnerships took and offers guidance on how institutions can use the Transfer Affordability Financial Tool. It also provides clear steps for how states can support institutions in improving transfer affordability. [This report was written with contributions from Katie Hagan. For "BOOSTing Student Success through Equitable and Affordable Transfer Pathways: Lessons Learned for Higher Education Policymakers and Practitioners from the TransferBOOST Initiative," see ED628654. For "BOOSTing Transfer Partnerships to Promote Equitable and Affordable Transfer Pathways," see ED628655.]