FBAR and U.S. FATCA are often discussed together, but they are separate reporting regimes with distinct filing requirements, thresholds, and compliance obligations. While both aim to increase transparency around foreign financial assets and offshore accounts connected to U.S. taxpayers, compliance with one does not necessarily satisfy obligations under the other. Understanding the key similarities and differences can help individuals, businesses, and financial institutions avoid reporting gaps and potential penalties.

As businesses increasingly operate across borders and state lines, understanding where tax obligations arise has become more complex than ever. This article explores how foreign and multistate corporations may become subject to U.S. federal income tax, state income tax, and state sales tax, and highlights the nexus and sourcing rules that drive compliance obligations.

Tax season brings a complex mix of federal filing deadlines and state compliance obligations that vary by entity and jurisdiction. This guide outlines the key dates for tax year 2026 to help individuals, businesses, and fiduciaries plan ahead and avoid last-minute pressure.