The Annual Fund accounts for nearly 6% of the school's annual budget. Rio Grande School relies on the Annual Fund to bridge the gap between tuition income and operating expenses. The operating budget's main expenses include salary and benefits, instructional materials, and maintenance of the campus physical plant. Board members, parents, employees, alumni, grandparents, and other friends are solicited in this campaign.
Rio Grande School seeks 100% participation of Board members, parents, and employees at whatever level possible. High participation percentages help the School leverage gifts from foundations, which look closely at the level of support school "internal" constituents provide as an indication of institutional strength. Every gift is important and is a vote of confidence in and support of the school by the donor. In the 2014-2015 year, 98% of the parent body and 100% of RGS employees participated in the Annual Fund, raising $172,288.