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FIRE Tax Optimization Calculator

A sophisticated Federal tax planning calculator designed for the Financial Independence / Retire Early (FIRE) community with side-by-side comparison of up to three tax scenarios.

exceltoweb.app/spintwig
FIRE Tax Optimization Calculator screenshot

The Challenge

The Excel file was a sprawling multi-tab workbook where users had to manually copy formulas across scenario sheets, each tracking 15+ income categories with complex tax bracket calculations.

The Solution

We built a multi-scenario web application with card-based layouts for each tax scenario. Users can input income sources across all categories and instantly see calculated tax obligations.

Results & Impact

The FIRE community embraced the calculator, generating over 10,000 unique users in the first six months through word-of-mouth sharing in financial independence forums and subreddits.

Key Features

Multi-scenario comparison (3 scenarios)

15+ income source categories

Capital gains/losses tracking

IRA distribution analysis

Real-time tax calculations

Side-by-side scenario view

Technologies Used

HTML5 CSS3 JavaScript Bootstrap 5

"The FIRE community is full of spreadsheet nerds, so the bar was high. This web app exceeded expectations — the side-by-side scenario comparison is something Excel just can't do elegantly. It's been shared extensively on the FIRE subreddits."

MT
Michael Torres
Founder, SpinTwig Financial Tools

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