Tax preparation, cut to brilliance.
Gemcore Black Diamond is a boutique tax preparation firm serving individuals, families, and businesses. We file returns that capture every credit and withstand scrutiny — done right, on time, every time.
Clarity, precision, and discretion in every return.
Every return, one standard
Individual Returns
Federal & state 1040 filing for wage earners, investors, and retirees — every credit captured.
Learn moreBusiness Returns
1120, 1120S, and 1065 entity returns with clean balance sheets and accurate K-1s.
Learn moreSelf-Employed & Freelance
Schedule C preparation for sole proprietors, contractors, and gig workers.
Learn moreState & Local
Multi-state, part-year, and nonresident returns — nexus sorted, every state filed.
Learn moreAmended & Prior Year
1040-X and entity amendments, back-tax catch-up, and penalty abatement.
Learn moreNonprofit Returns
990, 990-EZ, and 990-T preparation that keeps your exemption in good standing.
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A firm built like the returns it files.
Every return is prepared by a credentialed preparer and reviewed by a partner — no offshore hand-off, no seasonal temp pool, no surprises. Just clean filings, delivered on time.
Audit-ready by design
Every return is documented to withstand examination before it's ever filed.
Flat, upfront pricing
You know the cost before we begin — no hourly meter, no surprise invoice.
Ready to file with precision?
A 30-minute appointment with a preparer. Bring your documents, leave with a clear plan and a fixed quote.
Book your appointment