Fifteenth provides a flat‑fee, end‑to‑end tax preparation and advisory service for high‑earning individuals with equity compensation, multi‑state income, crypto and partnership assets. The platform securely aggregates payroll, brokerage and crypto data via APIs, runs an AI‑driven tax engine that identifies thousands of optimization opportunities, and delivers the results to experienced CPAs who review, file and offer year‑round guidance through an online portal.
Funding
$8.3M raised to dateRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
Founders
Product
Problem
High‑earning individuals with equity compensation, multi‑state income, and complex investment portfolios face fragmented tax preparation processes, frequent missed optimization opportunities, and unpredictable costs from traditional CPA services. These complexities often require specialized expertise that is difficult to access on a consistent, year‑round basis.
Solution
Fifteenth delivers a fully integrated tax service that pairs seasoned CPAs—many from Big Four and elite boutique firms—with an AI‑driven platform to automate data collection, identify thousands of potential tax savings, and execute precise equity‑compensation strategies. Clients connect their brokerage, payroll, and crypto accounts via secure APIs, allowing real‑time aggregation of 1099‑B, RSU, ISO/NSO, K‑1, and other transaction data. The AI engine continuously scans the consolidated dataset for timing optimizations (e.g., RSU sale, stock‑option exercise), AMT mitigation, and state‑specific deductions, then surfaces actionable recommendations through a web portal. CPAs review and validate the AI‑generated insights, provide proactive quarterly tax‑payment forecasts, and handle filing for federal, state, and local returns—all under a single flat‑fee agreement. Clients can message their CPA directly within the portal at any time, receiving timely guidance without hourly billing or surprise charges. The platform also supports multi‑state residency scenarios, crypto‑transaction tax treatment, and charitable‑donation modeling, ensuring comprehensive coverage of modern income streams.
Target Audience
The service targets high‑income professionals—such as tech employees, startup founders, venture‑capital partners, and executives—who receive equity compensation, manage multi‑state income, or hold complex assets like crypto and partnership interests. It also serves individuals with substantial side‑business or rental‑property income requiring specialized K‑1 and quarterly tax planning.
Features
- Secure, API‑based ingestion of payroll, brokerage, crypto, and partnership (K‑1) data for end‑to‑end automation.
- AI‑powered tax engine that flags over 3,000 optimization rules, including RSU/stock‑option timing, AMT calculations, and state‑specific credits.
- Real‑time dashboard showing filing status, estimated quarterly liabilities, and projected tax savings.
- Dedicated CPA team with Big Four experience providing human oversight, scenario modeling, and regulatory compliance.
- In‑portal messaging and document exchange enabling on‑demand support without hourly fees.
- Multi‑state filing capability with automated allocation of income and deductions across jurisdictions.
- Crypto‑transaction classification and cost‑basis reconciliation integrated into the tax workflow.
- Flat‑fee pricing model that bundles preparation, filing, and year‑round advisory services.