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UK NI & Employer Tax Calculator (2025-2026)

Calculate UK Income Tax, National Insurance, and Employer NI contributions for the 2025-2026 tax year. Use shortcode [uk_tax_calculator] to display the calculator.

by Faruk Desk · github.com/farukdesk/uk-ni-employer-tax-calculator-2025-to-2026---wordpress-plugin · website

★ 0stars

Install

Download source zip No release zip yet

This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.

Install straight from GitHub with WP-CLI:

wp plugin install https://github.com/farukdesk/uk-ni-employer-tax-calculator-2025-to-2026---wordpress-plugin/archive/refs/heads/main.zip
No built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
Readme github.com/farukdesk/uk-ni-employer-tax-calculator-2025-to-2026---wordpress-plugin ↗

A WordPress plugin for calculating UK Income Tax, National Insurance, and Employer NI contributions for the 2025-2026 tax year.

Features

  • ✅ Accurate Calculations - Based on official HMRC rates for 2025-2026
  • 📊 Complete Breakdown - Income Tax, Employee NI, Employer NI, and net income
  • 📅 Annual & Monthly Figures - View both timeframes
  • 📈 Percentage Display - See what percentage goes to each tax
  • 🎨 Responsive Design - Works on desktop, tablet, and mobile
  • ⚡ Easy Integration - Simple shortcode [uk_tax_calculator]
  • 🎯 No Configuration - Works out of the box
  • 🔒 Privacy-Focused - No data collection or external API calls

Installation

From WordPress Admin

  1. Download the latest release
  2. Go to Plugins > Add New > Upload Plugin
  3. Choose the ZIP file and click Install Now
  4. Activate the plugin
  5. Add [uk_tax_calculator] to any page or post

Manual Installation

  1. Clone this repository or download the ZIP
  2. Upload to /wp-content/plugins/
  3. Activate through the WordPress admin panel
  4. Add [uk_tax_calculator] to any page or post

Usage

Simply add the shortcode to any page, post, or widget:

[uk_tax_calculator]

Users can then:

  1. Enter their gross annual salary
  2. Enter their tax code (optional, defaults to 1257L)
  3. Click "Calculate Tax"
  4. View the complete breakdown

Tax Rates (2025-2026)

Income Tax (PAYE)

  • Personal Allowance: £12,570
  • Basic Rate (20%): £12,571 to £50,270
  • Higher Rate (40%): £50,271 to £125,140
  • Additional Rate (45%): Over £125,140

Employee National Insurance (Category A)

  • Primary Threshold: £12,570
  • 8% on earnings between £12,570 and £50,270
  • 2% on earnings above £50,270

Employer National Insurance

  • Secondary Threshold: £5,000
  • 15% on all earnings above £5,000

Example Calculation

For a salary of £50,000:

Item Annual Monthly % of Salary
Income Tax (PAYE) £7,486 £624 15%
National Insurance £2,994 £250 6%
Total Taxes £10,480 £873 21%
NET INCOME £39,520 £3,293 79%

Employer Costs: | Item | Annual | Monthly | |------|--------|---------| | Salary | £50,000 | £4,167 | | Employer's NI | £6,750 | £563 | | TOTAL COST | £56,750 | £4,729 |

Customization

Custom CSS

You can customize the appearance by adding CSS to your theme:

.uk-tax-calculator-container {
    /* Your custom styles */
}

Integration with Page Builders

The calculator works with all major page builders:

  • Elementor
  • Beaver Builder
  • Divi Builder
  • WPBakery
  • Gutenberg

Just add the shortcode in a shortcode widget or module.

Technical Details

File Structure

uk-tax-calculator/
├── assets/
│   ├── css/
│   │   └── calculator.css
│   └── js/
│       └── calculator.js
├── templates/
│   └── calculator-form.php
├── uk-tax-calculator.php
├── readme.txt
└── README.md

Browser Support

  • Chrome (latest)
  • Firefox (latest)
  • Safari (latest)
  • Edge (latest)
  • Mobile browsers

Security Features

  • WordPress nonce verification
  • Input sanitization
  • AJAX request validation
  • No external API calls
  • No data storage

Development

Requirements

  • WordPress 5.0 or higher
  • PHP 7.0 or higher
  • jQuery (included with WordPress)

Local Development

  1. Clone the repository
  2. Copy to your WordPress wp-content/plugins/ directory
  3. Activate the plugin
  4. Start developing!

Support

For issues, questions, or contributions:

  • Open an issue on GitHub
  • Submit a pull request
  • Check the WordPress.org support forum

Contributing

Contributions are welcome! Please:

  1. Fork the repository
  2. Create a feature branch
  3. Commit your changes
  4. Push to the branch
  5. Open a pull request

This calculator provides estimates based on standard UK tax rates for the 2025-2026 tax year. Actual tax liability may vary depending on individual circumstances. Always verify calculations with HMRC or consult a qualified tax professional.

Credits

Tax rates and thresholds based on official HMRC guidance for the 2025-2026 tax year.

License

This project is licensed under the GPL v2 or later - see the LICENSE file for details.

Changelog

Version 1.0.0

  • Initial release
  • Income Tax (PAYE) calculation
  • Employee National Insurance calculation
  • Employer National Insurance calculation
  • Support for custom tax codes
  • Responsive design
  • Annual and monthly breakdowns

Author

Faruk Desk

Made with ❤️ for the WordPress community