174 Background: Few studies have reported on interventions to alleviate financial toxicity (FT) in cancer patients (pts) and informal caregivers (cgs). We developed a financial navigation program in collaboration with Consumer Education and Training Services (CENTS), Patient Advocate Foundation (PAF), and Family Reach Foundation (FRF), to offer financial coaching, insurance navigation, and assistance with unpaid non-medical bills. We conducted a pilot study to assess feasibility of enrolling cgs with pts and to describe the assistance provided. Methods: Pts with any stage solid tumor actively receiving treatment (tx) at the Seattle Cancer Care Alliance were asked to identify a cg who could participate. Pts or pt/cg dyads received an online financial education course and monthly contact for 6 months (mo) with CENTS and PAF. Subjects were referred to FRF for assistance in paying non-medical bills. We describe pt and cg characteristics, and assistance provided by the program. Results: Of 54 pts approached, 30 (median age 59.5, 61% white, 97% stage III/IV disease) were consented. Most pts (53%) had income ≤ $25,000, and all were insured (48% commercial, 28% Medicare, 21% Medicaid). 18 cgs (67% spouse/partner) were consented. At consent, 55% of pts reported debt in the prior 3 mo. Mean score using the COST PRO FT measure (range 0-44, lower score = higher FT) was 17.4 at baseline. After pts’ physical health, out-of-pocket costs were the most stressful aspects of tx for cgs. Cgs with high financial burden from caregiving more often reported taking on new debt, dipping into retirement accounts, or changing their jobs or hours. CENTS coaches assisted with budgeting, updating wills, and employment rights counsel. PAF case managers assisted with financial assistance for drugs, cost of living (e.g. transportation), disability applications, and secured $6,950 in debt relief. FRF dispersed $4,133, primarily for housing expenses. Conclusions: Implementing a financial navigation program that engages both pts and cgs is feasible. This lower income, financially stressed population received $11,000 in financial assistance. Future work will focus on evaluating the impact of this program on financial and psychosocial outcomes in pts and cgs.