Build an 1099 Tax Calculator with Claude Code

Build an 1099 Tax Calculator web app. People search for "1099 tax calculator" about 13,000 times a month, plus related searches like "freelancer tax calculator", "self employment tax", "quarterly tax estimator". The goal is a tool that ranks for those searches and makes money.

What it should do:
Create a 1099 tax calculator with income input and expense deduction categories. Include quarterly tax estimation, self-employment tax calculation, and federal/state breakdown. Add deduction tracker, tax rate lookup by state, and payment schedule planner. Show estimated tax liability and suggested quarterly payments. Focus on getting accurate tax calculations working first.

How to build it:
1. Read this folder first. If it is empty, set up Next.js (App Router, TypeScript, Tailwind). Write a short PLAN.md with the pages, components, any library or API you need, and what you are leaving for later. Then build.
2. Put the tool itself on the homepage so a visitor can use it within seconds, with no sign-up. Do the processing in the browser where you can, so it is fast and cheap to run. Look at how FreeTaxUSA, TurboTax, TaxAct do it and make ours simpler and faster.
3. Make it rank. Use "1099 tax calculator" in the title tag, H1 and meta description. Under the tool, add a short how-to and an FAQ with FAQPage schema, and add a sitemap and robots.txt. Scaffold these programmatic pages from one template and a data file: /1099-tax-calculator-[state], /freelancer-tax-[profession], /quarterly-tax-[income-level].
4. Monetisation: Freemium: Basic calculations, $12/mo premium + tax planning. Add a pricing page and the free usage limit, and leave Stripe checkout as a clearly marked stub with the environment variables it needs.
5. Run it locally and test the main flow end to end, including edge cases like empty input and very large files. Fix what breaks, then finish with a summary of what works, what is stubbed and how to deploy it to Vercel.

Paste it into Claude Code in an empty folder. It plans first, so read PLAN.md and steer before it starts building.