We are excited to announce that WHMCS 9.0 is now available in General Availability.
With this release, WHMCS 9.0 is now the recommended version for all new installations and upgrades.

WHMCS 9.0 is a compliance-focused release, introducing a range of updates and enhancements designed to help businesses stay aligned with evolving regulatory requirements while continuing to deliver a seamless experience.

WHMCS 9.0 includes the following new functionality and enhancements:

Managing invoices and refunds across international markets can be complex, especially when tax compliance is involved. Thay's why WHMCS is introducing native support for credit notes and debit notes, bringing clarity and control to your financial workflows.

This feature update allows users to generate compliant credit and debit notes directly within WHMCS. Documents will be properly formatted to meet local tax regulations, improving transparency and accuracy for both you and your clients.

For businesses operating under VAT, GST, or similar frameworks, this functionality reduces manual work and supports legal compliance, all without compromising the integrity of your financial records. Immutable invoices remain the default, ensuring that audit requirements are met.

This feature enhancement makes invoice corrections and refunds simpler, faster, and more aligned with global standards, giving WHMCS users greater confidence and flexibility in every transaction.

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As customer expectations grow, so does the need for more flexible, developer-friendly integrations. WHMCS is developing a new extensible API for the buy flow, designed to meet your needs, with full control over the cart and checkout experience.

This new API allows developers to build custom ordering flows using standardized endpoints for listing products, adding items to the cart, and creating orders. Built around OpenAPI and JSON:API specifications, it supports RESTful methods and is UUID-aware, ensuring consistency, clarity, and future scalability.

For mid-to-large WHMCS users and developer teams, this means easier frontend customization, faster integration cycles, and the ability to deploy static frontends through CDNs without compromising performance or flexibility.

The API is being built to be well-documented, easy to test, and aligned with modern standards, giving your teams the tools to deliver optimized, branded shopping experiences while maintaining compatibility with the WHMCS core system.

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A new era is coming to the WHMCS client area and purchase experience. We're starting to redesign the WHMCS shopping cart to make every interaction faster, clearer, and more cost-effective.

This feature introduces a next-generation experience across the domain buy flow, from visual updates like color customization to key functionality improvements including the domain checker and shopping cart view. Every change is designed to remove friction and streamline the path a user takes to purchase.

For businesses using WHMCS, this means a smoother checkout process that improves conversions and creates a more polished, modern experience for your customers. It helps you stay competitive while offering a more professional and intuitive buying journey.

With this redesign, WHMCS is evolving to meet your needs, making it easier to sell, easier to manage, and easier to grow. This feature is now live in WHMCS 9.0, and it's built entirely around improving the experience for both you and your customers.

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Finding the right domain name can be a blocker to conversion, and WHMCS is evolving to remove that friction. We've enhanced our Namespinning feature with AI-powered suggestions, helping your customers discover relevant domain names faster and with less effort.

This update allows users to enter natural, descriptive text (not just keywords) to generate smart, contextual domain suggestions. By improving discoverability, this feature reduces cart abandonment and increases the likelihood of domain purchases.

For hosting providers, this means a smoother search experience that drives more completed transactions. For resellers, it's an effortless way to boost domain sales and increase commissions through registrar partnerships. For agencies, it adds value to your service offering without adding overhead or complexity.

The new Namespinning experience is designed to improve user satisfaction and drive more registrations. It's live now in WHMCS 9.0 helping your customers find the right domain and helping you grow revenue with every search.

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Upcoming regulatory changes to SSL certificate validity periods present a major shift for website owners and SSL retailers. WHMCS MarketConnect is now enhanced to support these new standards. Starting with maximum validity reductions to 200 days, and later to 47 days, we are ensuring compliance without complexity.

This update gives WHMCS customers a fully automated way to manage shorter SSL lifecycles. Certificates will be sold, reissued, and maintained hands-free, removing the need for manual intervention or frequent renewals.

For business owners, this means continued trust and security for their customers, without added operational effort. For resellers, it ensures uninterrupted SSL sales and renewals, keeping revenue consistent even as the market adapts to new regulations.

Our goal remains the same, to provide our customers with a seamless, automated SSL management experience through WHMCS MarketConnect, keeping your business secure, compliant, and always one step ahead.

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Adopting WHMCS should be simple and centralized. Still, many business owners manage customer data across multiple systems. This feature introduces a new import utility into WHMCS designed to make it easier to bring customer and account data into WHMCS from third-party platforms.

The CSV Support for ImportAssist tool supports imports via standard CSV flat-file formats, allowing users to quickly upload and consolidate customer accounts without complex migration processes.

For business owners, this means a faster path to centralizing operations within WHMCS, reducing friction during onboarding or expansion. It removes a common blocker of adoption by eliminating data fragmentation at the start.

This is just the beginning. With customer account imports in place, the foundation is set for future support of additional data types like domains, invoices, transactions, and other services.

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Accurate tax handling is essential for a smooth checkout experience and for staying compliant with regional regulations. This feature update enhances VAT compliance in WHMCS by improving how VAT is calculated, validated, and displayed during checkout.

With this enhancement, WHMCS now displays VAT-inclusive pricing based on the buyer's location and validates VAT numbers against country-specific formats. Automated updates to tax rates ensure your online store stays in sync with changing regulations, without the need for manual intervention.

For WHMCS business owners, this means less risk of tax miscalculations and fewer support issues related to pricing or compliance. It helps build trust with customers by providing clear, transparent tax information at every step.

This improvement simplifies the buying experience, supports legal compliance, and enables a more professional storefront, giving your customers confidence in every transaction.

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Maintaining support for outdated PHP and IonCube Loader versions increases technical involvement and security risk. That's why in WHMCS 9.0 we are removing support for end-of-life PHP versions 7.2, 7.3, 7.4, and 8.1, along with IonCube Loader versions 10.2, 10.3, and 10.4.

This change enables a more secure and maintainable platform by eliminating legacy dependencies that hinder development speed and complicate testing. It also streamlines the WHMCS build system by removing unnecessary packages and outdated components.

For WHMCS business owners and developers, this means improved platform stability, faster delivery of updates, and reduced exposure to vulnerabilities associated with unsupported environments.

By modernizing the core system, this 9.0 feature ensures WHMCS remains secure, efficient, and ready to support your business's future growth, all without compromising quality or performance.

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Keeping MarketConnect up to date is key to helping WHMCS customers drive revenue through cross-sells and upsells.

We're enhancing WHMCS and MarketConnect to support backward-compatible dynamic services. That means new offerings can be made available without requiring users to upgrade their WHMCS instances, accelerating product adoption and keeping your service catalog fresh.

For business owners, this means faster access to revenue-generating products with less friction. For resellers, it unlocks the ability to scale services on stable versions. For agencies, it ensures smoother client experience with consistent performance across environments.

This update also improves backend performance, enhances caching, and ensures tighter integration with dynamic APIs by delivering a faster, more flexible experience for both admins and end users.

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As always, we encourage all users to upgrade to take advantage of the latest features, enhancements, and improvements. Simply navigate to Utilities > Update WHMCS to begin the update process.

For more information about everything new in WHMCS 9.0, visit the What's New page in WHMCS 9.0 microsite.