BorderBird is built for a specific and underserved gap: Canadians who own rental properties in the US and have to satisfy both CRA and IRS requirements every year. It connects to Gmail to automatically detect Interac e-Transfer and Zelle rent payment emails, eliminating manual income logging. On the tax side, it calculates the 25% CRA withholding required under NR4 rules and generates both the T776 (for CRA) and Schedule E (for the IRS), with CAD/USD conversion handled automatically. An AI lease extraction feature lets landlords upload a PDF lease to pull out key terms without reading through the document manually. The tool targets landlords who are currently juggling spreadsheets or paying a CPA $1,500–$2,000 a year purely for cross-border tax compliance — and replaces that workflow with software built around their specific filing obligations.