Add app entry: Tax Calculator PWA

src/content/apps/tax-calculator-pwa.md

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+---
+id: '1771119000000'
+slug: tax-calculator-pwa
+name: "Tax Calculator PWA"
+shortDescription: "A mobile-first, installable web app for quick everyday tax calculations (VAT, withholding, etc.)."
+tags:
+  - finance
+  - productivity
+  - pwa
+  - calculator
+lastUpdated: '2026-02-15'
+relatedMechanisms:
+relatedApps:
+relatedCaseStudies:
+relatedResearch:
+relatedCampaigns:
+---
+
+**Tax Calculator PWA** is a lightweight, mobile-first **progressive web app** designed to make common tax calculations fast and error-resistant.
+
+It’s intentionally simple: open it, type a number, get the exact breakdown you need—no spreadsheets, no menus, no clutter.
+
+## What This App Does
+
+- **VAT (부가세) calculator**: convert between pre-tax / VAT / total, including reverse-calculation from tax-inclusive amounts.
+- **Withholding (원천징수) calculator**: compute withholding amount and net payout for common withholding rates.
+- **Rounding clarity**: explicit rounding display so you can copy numbers into invoices or payment requests.
+
+## Who It’s For
+
+- Freelancers and solo operators who frequently need quick tax breakdowns
+- Creators and small businesses who issue invoices and want consistent calculations
+- Anyone who wants a tiny “calculator that remembers tax rules” on their home screen
+
+## Notes
+
+- This is a PWA intended to be **installed to the phone home screen** for one-tap access.
+- The goal is speed and correctness for daily operations, not exhaustive tax filing.
+