Fifteenth is a tech-enabled tax planning and filing firm built for founders, investors, executives, and tech professionals. We combine top-tier tax expertise with an AI-powered platform to make tax season seamless and stress-free. Starting at just $1,000 per year, our clients receive unlimited access to strategic guidance from seasoned CPAs who specialize in complex financial scenarios—equity compensation (ISOs, RSUs, NSOs), liquidity events (IPOs, tender offers, secondaries, acquisitions), partnership income (K-1s), real estate, 1099s, and more.