Hello,
We are a Ukrainian team of developers. We checked the examples and we can develop a salary calculator for you.
Our skills: Adobe Photoshop, Illustrator, Php, Yii, Laravel, HTML, CSS, Bootstrap, MySQL, CMS Wordpress, Opencart, Prestashop, Drupal, Joomla, etc. You can see our profile here https://www.freelancer.com/u/Webln .
We can discuss your details via PM.
With regards,
WebIn team.