N&D Tax and Advisory, LLC is a CPA firm based in Park City, Utah, serving individuals, small businesses, trusts, and estates. The firm provides tax and accounting support that includes individual and business tax preparation, tax planning, accounting services, bookkeeping, CPA advisory, and help with IRS notices and audits.

Originally founded in 1999 as Niederhauser & Davis, LLC, the firm continues to focus on tax consultation and preparation alongside business and accounting services. Its listed service areas include tax preparation, tax consulting, tax representation, accounting, bookkeeping, and business advisory for clients who need ongoing or situation-specific support.