Diamond Tax provides tax services for individuals, families, and businesses from its Elk River, Minnesota location, with service available across Minnesota and the United States. The firm supports personal taxes, business taxes, tax planning, sales tax needs, IRS notice and audit help, and filings for S-Corps, LLCs, partnerships, farms, nonprofits, trusts, and related organizations.

Its accounting support includes bookkeeping services, account reconciliation, payroll processing, and help for new business formation. Diamond Tax also notes experience with farms, daycare, nonprofits, trusts, charitable missions, and small businesses, and works with both in-person and remote service formats.

The firm describes its approach as personalized and focused on clarity, accurate filings, effective planning, and year-round compliance. Listed tools and capabilities include QuickBooks, payroll, bookkeeping, and startup support.