Inside IR35 PHP Contract Jobs

Organisations bring in PHP contractors to build, maintain, and extend web applications using the PHP programming language, which powers a substantial proportion of the world's websites and web applications and remains a significant component of the UK technology contracting market. PHP's dominant presence in content management systems, particularly WordPress, Drupal, and Typo3, as well as its strong position in e-commerce through platforms including Magento, WooCommerce, and Shopify's Liquid extension language, ensures a consistent and broad base of PHP contract demand. Contract engagements range from custom PHP application development and API work using frameworks such as Laravel or Symfony, through to maintenance and extension of legacy PHP applications that represent a significant and ongoing part of the PHP contracting market.

PHP contractors are expected to have strong practical experience developing PHP applications beyond basic scripting, with proficiency in modern PHP standards including PSR compliance, object-oriented design, Composer for dependency management, and PHP 8.x language features. Familiarity with the major PHP frameworks is expected depending on the engagement: Laravel is the most commonly required modern PHP framework; Symfony is the dominant framework in enterprise and government PHP development; WordPress theme and plugin development is a distinct and large segment of the PHP contractor market. Database skills, particularly MySQL or MariaDB, are universally expected alongside PHP. Experience with REST API development, caching strategies using Redis or Memcached, and deployment using Docker and modern cloud hosting platforms is broadly assumed at senior level. Testing with PHPUnit and familiarity with CI/CD pipelines for PHP applications is expected for professional-level roles.

PHP contracting is a large and consistently active market, driven by the enormous installed base of PHP-powered websites and applications across every sector. The WordPress ecosystem alone generates a very substantial volume of PHP contractor demand for theme development, plugin development, and bespoke functionality, particularly in media, publishing, and SME web development. The e-commerce market, particularly Magento and WooCommerce, is another significant source of PHP contract work. Modern PHP framework development using Laravel and Symfony represents the highest-value segment of the PHP contracting market, where rates are competitive with other senior back-end developer disciplines. Rates at the standard PHP development level are more moderate, reflecting the broad supply of PHP developers relative to the more specialist framework and e-commerce segments.

IR35 is UK tax legislation that determines whether a contractor is genuinely self-employed or working in a manner that resembles employment. When a contract is classified as inside IR35, income tax and National Insurance are deducted at source, typically via an umbrella company or agency PAYE. Headline day rates on inside IR35 engagements are generally higher than equivalent outside IR35 roles to account for the tax and employment cost structure.

Inside IR35 determinations are made where the working arrangements are considered to resemble employment, based on factors including the level of client control, the absence of a genuine right of substitution, and the presence of mutuality of obligation. Since April 2021, the end client is responsible for making this determination for medium and large private sector organisations. Many employers in financial services, government, and professional services assess the majority of their contractor engagements as inside IR35.

On QualityContracts.co.uk, approximately 49% of roles with a stated IR35 status are classified as inside IR35, making it the most common arrangement across the contract market. The proportion varies by sector and role type. Each listing on this page displays its IR35 status where provided by the hiring organisation.

Inside IR35 PHP work is found in organisations maintaining established PHP codebases that need ongoing development and support. Media companies, e-commerce platforms, and large content sites running on WordPress, Magento, or bespoke PHP applications hire contractors to add features, resolve bugs, and maintain platform stability. The contractor joins the development team and works within the existing codebase and release process. PHP rates sit below equivalent JavaScript or Python roles, reflecting the broader candidate pool.

Contract rates for php roles typically range from £350 to £650 per day, depending on the scope of the role, required expertise, and the delivery expectations of the engagement. Inside IR35 rates are typically 15% to 30% higher than equivalent outside IR35 roles to account for tax and national insurance deducted at source by the fee-payer.

Over the past twelve months, we have tracked over 150 php contract roles across the site. Around one third of the roles currently listed on the site fall Inside IR35. Data reviewed up to June 2026.