No, it is not a best practice for SEO to use the same meta description under the H1 tag on the homepage of a website. The meta description and H1 tag should serve different purposes. The meta description is meant for search engines and should provide a concise summary of the page's content, while the H1 tag is for on-page content and should accurately describe the main topic or purpose of the page. Using the same content for both can lead to confusion and is not ideal for SEO.