If you're comparing Deduction and Fifteenth, you probably have complex taxes — equity compensation, multiple income sources, maybe a liquidity event on the horizon. You've outgrown traditional tax solutions and now you're looking at two platforms that both combine AI with human tax professionals.
Deduction and Fifteenth aren't in the same product category. Fifteenth is an AI-enhanced CPA firm built specifically for tech professionals with equity compensation. Deduction is an AI tax firm and the creator of Taylor, CPAI, an AI tax accountant that works alongside CPAs to prepare, plan, and file your return year-round, for anyone with complex taxes.
Both have real tax professionals doing real work. The difference is in what the AI does, who the platform serves, what it costs, and what happens when your tax life extends beyond stock options.
This guide breaks down what each option actually offers, what they cost, and which one fits how you want to deal with your taxes.
Core difference: Fifteenth built an AI-enhanced CPA firm for tech employees with stock options. Deduction built Taylor, CPAI an AI tax accountant that handles your entire tax life year-round not just limited to equity and human tax professionals involved throughout.
AI CPA Firm vs. AI Tax Accountant
Before diving into features and pricing, let's establish the fundamental distinction. This shapes everything else.
Fifteenth: AI Tools That Support Human CPAs
Fifteenth help tech professionals navigate equity compensation taxes. The platform pairs human CPAs with AI-powered support tools. Experience looks like:
- You sign up and get matched with a CPA who specializes in tech equity
- The platform's AI reads and categorizes your tax documents automatically
- Your CPA uses scenario modeling tools to evaluate equity decisions — when to exercise ISOs, how to handle a tender offer, what an IPO means for your tax bill
- The team connects with you quarterly for planning
- Your CPA prepares and files your returns
This is more like a traditional CPA experience, enhanced by smart technology. The AI handles the parts like document organization, data import, scenario calculations, so the human CPA can focus on strategy and filing.
But the model is fundamentally a traditional CPA relationship with better tools and service designed around one specific persona: tech professionals with equity.
Deduction's Taylor, CPAI: An AI Accountant That Works For You
Deduction is a full-service CPA firm powered by Taylor, CPAI, an AI tax accountant. The experience is fundamentally different:
- Chat, text or email with your AI tax accountant, anytime, anywhere, year-round
- No app to download, no platform to learn, simply upload your documents to secure vault
- Taylor, CPAI handles document collection, communication, and return preparation
- Every high-impact decision and final filing is reviewed by a licensed CPA
- Year-round access for proactive tax planning, not just quarterly check-ins
It's the personal tax accountant experience without the traditional hassle or costs. And it works for everyone, freelancers, tech employees with equity compensation, content creators with mixed income, sole proprietors, anyone whose taxes have grown beyond the basics.
Fifteenth built better tools for CPAs who serve tech workers. Deduction built a new way to do your taxes entirely.
What the AI Actually Does
This is where the two platforms diverge most clearly.
Fifteenth
Fifteenth's AI is a productivity layer for the human CPA. It does three things:
First, the document collection: AI helps organize and categorize your tax documents so your CPA can find everything easily. No more emailing PDFs back and forth.
Second, integrations: With Workday, Rippling, Carta, Schwab, Robinhood, Wealthfront, AngelList, and Coinbase pull your financial data directly into the platform.
Third, scenario modeling: the AI calculates tax implications of different equity decisions, exercise timing, sale strategies, AMT exposure, giving your CPA the data to advise you.
The AI enhances the CPA workflow. Your CPA still does the planning, the advising, and the filing and AI makes them faster.
Deduction
Taylor, CPAI acts as your AI tax accountant, with licensed CPA oversight. Taylor handles document collection, answers your tax questions, prepares your return, and provides year-round planning advice with no delays or waiting for CPA to respond. Every high-impact decision and final filing is reviewed by a licensed tax professional.
The distinction matters for how you experience the service. With Fifteenth, you're waiting for a human to review your documents, run scenarios, and get back to you. With Deduction, Taylor, CPAI processes your information and responds conversationally, with CPA oversight ensuring accuracy on every decision that matters.
AI speed combined with professional accuracy. That's what Taylor, CPAI is built for.
Year-Round Support
Fifteenth
Fifteenth provides quarterly proactive planning, your CPA team reviews your situation, calculates estimated payments, and identifies tax-saving opportunities each quarter. Between check-ins, you can message your CPA through the platform. The service also includes guidance on estimated quarterly payments to help you avoid penalties.
This is meaningfully better than the typical CPA relationship where you only talk once a year at filing time. Quarterly planning is real, structured support.
But the cadence is set by the calendar, not by your life. If a major equity event happens between quarterly check-ins, an unexpected tender offer, a job change with new stock options, a decision about exercising before year-end, you're messaging through the platform and waiting for a response.
Deduction
Deduction emphasizes continuous tax planning and answers outside of tax season, not just preparation at filing time. Unlimited questions without additional cost.
"Should I exercise these options before year-end?" "How will this freelance project affect my quarterly estimates?" "I'm thinking about buying a rental property, what should I know?"
Taylor, CPAI is available whenever you have questions. Your $499 covers the whole year.
The best tax decisions happen before December 31, not in April. Year-round access means proactive planning on your schedule, not a quarterly cadence.
When Fifteenth Makes Sense
Let's be fair. Fifteenth might be right for you if:
- You're a tech employee whose primary tax complexity is equity compensation, ISOs, NSOs, RSUs, tender offers, IPOs
- You want a human CPA who specializes exclusively in tech equity tax planning
- You prefer a structured quarterly planning cadence with a specific CPA assigned to your account
Fifteenth built with a focused, tech-forward CPA firm with useful AI tools. If your tax life is centered entirely around equity compensation and you want a specialist, it's a good option.
When Deduction Is the Better Choice
Deduction is built for you if:
- Your taxes have grown complex, equity compensation, freelance income, rental properties, investments, or all of the above
- You'd rather chat with an AI tax accountant than wait for quarterly CPA check-ins
- You want flat, transparent pricing, $499, no personalized quotes, no uncertainty
- You need a tax advisor who handles your full financial picture, not just equity
- You're a creator, freelancer, or sole proprietor whose complexity goes beyond stock options
- You want year-round access on your schedule, not on a quarterly cadence
- You're currently paying a CPA $1,000 - $2,000+ and want the same depth of advice for half the price
- You're ready for a tax accountant, not just a tax tool
Ready for Tax Prep That Actually Fits Your Life?
If you're ready to experience what it's like to have an AI tax accountant for AI tax prep, while your tax team is involved throughout, Deduction is here for you.
Chat with Taylor, CPAI, free. Ask a real tax question and experience what it's like to have an AI accountant in your corner.
No forms. No portal to learn. No waiting for your next quarterly check-in. Just a conversation with an AI tax professional, backed by licensed CPAs.
Frequently Asked Questions About Deduction vs Fifteenth
Here are some frequently asked questions about Deduction vs Fifteenth:
Is Taylor, CPAI a chatbot or an actual AI accountant?
Taylor, CPAI is an autonomous AI tax accountant, not a simple chatbot. Taylor handles document collection, answers complex tax questions, and prepares your return, all via natural chat, text or email. Every high-impact decision and final filing is reviewed by a licensed tax professional, combining AI capability with professional oversight.
Can Deduction handle equity compensation like Fifteenth does?
Yes. Taylor, CPAI handles RSUs, ISOs, NSOs, AMT calculations, cost basis adjustments, 83(b) elections, and liquidity event planning. The difference is that Deduction handles these alongside every other type of tax complexity, freelance income, rental properties, S-Corps, mixed income sources, rather than focusing exclusively on equity.
Is Fifteenth only for tech employees?
Fifteenth is built specifically for tech professionals, particularly those with equity compensation. If your primary tax complexity comes from stock options, RSUs, or liquidity events, that's their sweet spot. If your tax life includes other complexities, freelancing, rental income, content creation, you'll likely need a broader solution.
What if I have equity AND freelance income?
This is where Deduction's breadth matters. Taylor, CPAI handles your RSUs and stock options alongside your 1099 income, business deductions, and anything else in your tax picture.
