Background: Few family caregivers of individuals with intellectual or developmental disabilities develop long-term care (LTC) plans for their relative. Web-based interventions promoting LTC planning have potential for widespread adoption into clinical practice. Methods: We conducted focus groups with 49 primary caregivers of individuals with intellectual or developmental disabilities in NY, PA, OH, DE, and TX to identify barriers and facilitators of LTC planning, review existing tools, and identify critical features for web-based LTC planning interventions. Participants also answered questions on demographic characteristics and functional status. Results: NVivo qualitative analysis software was used to analyse focus groups using a grounded theory approach. Caregivers identified web tool accessibility and topics such as finances, housing, and government benefits as critical. Caregivers also described desired features for a LTC planning tool. Conclusions: This study identified desired characteristics of web-based LTC planning tools and ways in which existing web-based interventions might be adapted or enhanced.