Background: Financial advocacy interventions help patients, and their families address financial hardship experienced through the cancer journey. However, how financial services are offered to patients varies greatly. Across the field of financial advocacy there is a lack of standardization of services, which is needed to accurately evaluate the impact of oncology financial advocacy. The Association of Community Cancer Centers (ACCC) Financial Advocacy Network (FAN) set out to revamp the Financial Advocacy Services Guidelines originally published in 2018, with the goal of providing cancer programs direction in implementing and improving financial advocacy services offered to patients with cancer. Methods: ACCC convened a task force of 7 multidisciplinary financial advocacy experts to guide the process of creating consensus-based financial advocacy services guidelines. The task force assembled a panel of 49 diverse oncology financial advocacy experts. A literature review and input from panelists was used to draft a list of guideline statements. Panelists went through 2 rounds of anonymous voting to inform revisions to the guideline statements. Consensus for the guideline statements was set at 75% agreement. The statements were rated as should not be a guideline, minimum guideline, or enhanced guideline. Cancer program staff completed a questionnaire upon downloading the guidelines. Results: After completion of the 2 rounds, the panel reached consensus that 43 statements should be guidelines. The guidelines are split into three main domains: financial advocacy services & functions; program management functions; and partner engagement functions. The updated Guidelines, which provide cancer organizations with the foundation to implement services to help reduce financial burdens of care, were published in March 2023 and are publicly available. From March 2023 until June 2023, it was downloaded by 93 cancer program staff members, of which 74% stated they will use it to assist in the development, implementation, and/or enhancement of a formal advocacy program at their organization and 58% responded that they have a financial advocacy program already implemented or have a financial advocate on staff. Conclusions: As financial advocacy grows more complex, interventions for patients with cancer are vital. The Guidelines provide expert-developed and consensus-based methods to assist cancer organizations with implementing financial intervention services. Importantly, the newly published guidelines will aid in closing existing gaps in delivery of oncology financial services as 48% of respondents stated they do not have a financial advocacy program or staff member. Further it will promote broader collaboration among partners to aid with assessment tools, creating valid measures and rigorous evaluation of the guidelines to improve cancer patients’ experience and reduce financial barriers to care.