Established in 1923, Nelson & Nelson CPA’s is South Dakota's oldest homegrown CPA firm, located in Sioux Falls, SD. Trusted with the Midwest's accounting need for more than 95 years. We offer bookkeeping, tax advice, payroll service, retirement planning, tax planning, estate and trust accounting, non-profit services, and of course tax returns for individuals and businesses. /nThree generation of Nelson CPA’s are currently serving clients.