Competent Diligence,
Working for You.
A boutique CPA firm serving the German-American community with cross-border tax expertise, estate planning, and business consulting — delivered with German precision and the trust of a firm rooted in Naples for over a decade.
A Legacy of Cross-Border Tax Service
The firm’s founder, Sebastian Nye-Schmitz, is the son of the late Werner Schmitz, a Steuerberater (German tax advisor) who founded SSI Accounting & Tax Service, Inc. in 1998 — a firm that served the German-American community with dedication and expertise for many years. SSI continues today under new leadership, while Sebastian founded The Nye-Schmitz Accounting Firm to carry forward his father’s tradition of meticulous, bilingual tax service with his own credentials as a CPA and Attorney.
We honor my father’s legacy by delivering the same standard of competent, diligent service that he built his reputation on — now enhanced with modern technology, an expanded range of cross-border capabilities, and the added perspective of a CPA who is also admitted to the practice of law.
Comprehensive Cross-Border Tax Services
From individual returns to complex treaty-based estate planning — handled with meticulous care.
Income Tax
Form 1040 & 1040-NR, corporate and partnership returns, ITIN applications as a Certifying Acceptance Agent, FBARs, and treaty-based planning.
Learn More →Estate & Gift Tax
U.S. domiciliary and non-domiciliary returns, gift tax returns, and treaty-based unified credit calculations under the U.S.-Germany Estate and Gift Tax Treaty.
Learn More →Withholding (FIRPTA)
FIRPTA withholding returns, certificate requests, refund procurement, and treaty-based rate reductions for cross-border income.
Learn More →Consulting
Immigration business plans, financial record review, litigation support, and cross-border business structure planning.
Learn More →Serving the German-American Community
Across Southwest Florida
From our office in Naples, we serve German-American clients throughout Southwest Florida — including Cape Coral, Fort Myers, Bonita Springs, Marco Island, Estero, Port Charlotte, Punta Gorda, Venice, and Sarasota. Whether you need help with U.S. income tax, cross-border estate planning, FIRPTA withholding, or business consulting, we provide the same meticulous, bilingual service wherever you are.