Diamond Head Tax Group is a full-service tax, accounting, and business consulting firm based in Honolulu, Hawaii. The firm describes its approach as accurate, diligent, and personalized, serving individuals and organizations with tax and financial needs. For individuals, its services include tax preparation, financial planning, retirement and estate planning, wealth management, and digital asset services. Tax support also covers tax planning, estate and trust tax services, and tax relief.

Businesses can access CFO services, cash flow management, bank financing assistance, business valuation, advisory services, succession planning, financial planning, and help with new business formation. The firm also serves nonprofit organizations and provides tax preparation and planning for businesses. Its QuickBooks services include setup and tune-ups, along with support for users of the accounting software.

Diamond Head Tax Group serves clients across industries including construction, dentistry, healthcare, hospitality, law, real estate, technology, and transportation. Its website provides client access and practical resources such as tax forms, financial calculators, guides, newsletters, and information to help clients manage tax responsibilities.