A modern, transparent Singapore tax estimation tool for personal and corporate income tax — based on official IRAS guidance.
NovaMock is a sleek, dashboard-style web app that helps Singapore residents, professionals, and business owners estimate their personal and corporate income tax. All calculations are based on official IRAS (Inland Revenue Authority of Singapore) progressive tax rates, exemption schemes, and CIT rebate rules.
| Feature | Description |
|---|---|
| Personal Income Tax | Progressive bracket calculation for residents (YA 2024–2026), non-resident flat rate support |
| Corporate Income Tax | 17% flat rate with Start-Up Tax Exemption (SUTE), Partial Tax Exemption (PTE), and CIT rebate |
| Real-Time Calculation | Tax figures update instantly as you type — no page refreshes needed |
| Bracket Breakdown | See exactly how your tax is computed across each bracket with tables and bar charts |
| Dark / Light Theme | Polished dual-theme with localStorage persistence and auto-detection |
| Print-Friendly | Export or print your tax summary for personal records or advisor review |
| Responsive Design | Works seamlessly on desktop, tablet, and mobile devices |
| Privacy First | All data stays in your browser — no servers, no tracking, no sign-up |
| Sample Data Loader | One-click sample data to explore the calculator instantly |
| localStorage Persistence | Inputs are saved locally so you can pick up where you left off |
| Category | Technology |
|---|---|
| Markup | HTML5 |
| Styling | CSS3 (custom properties, responsive grid, animations) |
| Logic | Vanilla JavaScript (ES6+) |
| Fonts | Inter (Google Fonts) |
| Hosting | GitHub Pages |
| Tax Data | IRAS official progressive rates and CIT rules |
┌──────────────────────────────────────────────┐
│ Browser │
├──────────────────────────────────────────────┤
│ ┌──────────┐ ┌──────────┐ ┌──────────┐ │
│ │ index │ │ personal │ │corporate │ │
│ │ .html │ │ -tax.html│ │-tax.html │ │
│ └────┬─────┘ └────┬─────┘ └────┬─────┘ │
│ │ │ │ │
│ ┌────▼──────────────▼──────────────▼─────┐ │
│ │ css/styles.css │ │
│ │ (themes, responsive, components) │ │
│ └────────────────────────────────────────┘ │
│ │
│ ┌────────────────────────────────────────┐ │
│ │ js/common.js │ js/theme.js │ │
│ │ (utils, format) │ (dark/light toggle)│ │
│ └─────────┬────────┴────────┬────────────┘ │
│ │ │ │
│ ┌─────────▼─────┐ ┌───────▼──────────┐ │
│ │ personal-tax │ │ corporate-tax │ │
│ │ .js │ │ .js │ │
│ └───────┬───────┘ └───────┬──────────┘ │
│ │ │ │
│ ┌───────▼──────────────────▼──────────┐ │
│ │ js/data/tax-rates.js │ │
│ │ (IRAS brackets, exemptions, CIT) │ │
│ └─────────────────────────────────────┘ │
└──────────────────────────────────────────────┘
novamock/
├── index.html # Landing page with hero and calculator cards
├── personal-tax.html # Personal income tax calculator
├── corporate-tax.html # Corporate income tax calculator
├── about.html # Tax rules, FAQ, and feature summary
├── css/
│ └── styles.css # Complete theme system (dark/light), responsive layout
├── js/
│ ├── common.js # Shared utilities (currency format, validation, localStorage)
│ ├── theme.js # Dark/light mode toggle with persistence
│ ├── personal-tax.js # Personal tax calculation engine
│ ├── corporate-tax.js # Corporate tax calculation engine
│ └── data/
│ └── tax-rates.js # IRAS tax brackets, exemptions, and CIT rebate data
├── assets/
│ └── screenshot.png # App screenshot
├── screenshot.png # README screenshot
└── README.md
- A modern web browser (Chrome, Firefox, Safari, Edge)
- No build tools, frameworks, or server required
-
Clone the repository
git clone https://github.com/alfredang/novamock.git cd novamock -
Open in browser
open index.html
Or simply double-click
index.htmlin your file explorer.
No server needed — just open index.html directly in your browser. All pages link to each other via relative paths.
For a local development server (optional):
npx serve .This project is deployed automatically via GitHub Actions. Every push to main triggers a deployment to:
https://alfredang.github.io/novamock/
Since this is a static site, you can deploy it anywhere:
- Drag and drop the folder to Netlify
- Upload to any static hosting provider
- Serve from any web server (Apache, Nginx, etc.)
Contributions are welcome! Here's how:
- Fork the repository
- Create a feature branch (
git checkout -b feature/amazing-feature) - Commit your changes (
git commit -m 'Add amazing feature') - Push to the branch (
git push origin feature/amazing-feature) - Open a Pull Request
- IRAS — Official Singapore tax rates and guidance
- Inter Font — Clean, modern typeface by Rasmus Andersson
- Shields.io — Badges for the README
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