Callahan Financial Planning was founded in 2010 as an independent, fee-only fiduciary financial advisory firm headquartered in Omaha, Nebraska. The firm was a leader in wealth management technology for high net worth families, providing holistic personal financial planning that integrated investments, income taxes, retirement, insurance, and estate planning. With offices across Nebraska, California, and Colorado, the firm served hundreds of families and managed approximately 175 million in assets prior to its acquisition.

In April 2021, Callahan Financial Planning merged with TS Prosperity Group, the trust division of TS Bank, in a transaction that doubled the combined businesses to an estimated 450 million in assets under management. The firm remained a separately identifiable division of TS Banking Group, continuing to serve clients under the Callahan Financial Planning brand while benefiting from enhanced trustee services, tax planning, and technology resources.