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Viva La Tax
Open-source tax engine — file for free, audit every number
Viva La Tax is a free, open-source tax filing engine that lets you see exactly how every number on your return was calculated. Upload your W-2s, 1099s, and K-1s (or enter your info step by step), and the engine computes your federal and state returns with full line-by-line transparency. Download completed IRS forms as fillable PDFs. - Federal Form 1040 + all major schedules and forms - 15,000+ automated tests against IRS instructions - Self-host with Docker
Hey Product Hunt! I'm the maker of Viva La Tax.
I started this because I wanted to see the actual formula behind every number on my tax return. I also wanted to see how far we can push an AI harness with a deterministic core.
The architecture is spec-driven: every IRS form line is documented in a YAML file with the formula, the IRS instruction reference, and the edge cases. Every spec entry has a unit test. The chain goes: IRS instruction → spec → test → engine code → your return.
The whole thing is TypeScript with decimal math, Zod validation, and a Next.js frontend.
It handles most individual tax situations: W-2 wages, self-employment, investments, rental income, crypto, retirement distributions, education credits, and more. Six states have deeply validated engines; the rest use a generic engine with published tax brackets.
Self-hosting is `docker compose up`. Hosted version is at vivalatax.com.
Would love your feedback, like on what tax situations to prioritize next!
About Viva La Tax on Product Hunt
“Open-source tax engine — file for free, audit every number”
Viva La Tax was submitted on Product Hunt and earned 1 upvotes and 1 comments, placing #103 on the daily leaderboard. Viva La Tax is a free, open-source tax filing engine that lets you see exactly how every number on your return was calculated. Upload your W-2s, 1099s, and K-1s (or enter your info step by step), and the engine computes your federal and state returns with full line-by-line transparency. Download completed IRS forms as fillable PDFs. - Federal Form 1040 + all major schedules and forms - 15,000+ automated tests against IRS instructions - Self-host with Docker
On the analytics side, Viva La Tax competes within Open Source, Fintech, Artificial Intelligence and GitHub — topics that collectively have 622.7k followers on Product Hunt. The dashboard above tracks how Viva La Tax performed against the three products that launched closest to it on the same day.
Who hunted Viva La Tax?
Viva La Tax was hunted by Beebs. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Viva La Tax including community comment highlights and product details, visit the product overview.
Beebs