Following his win, Jackson was the main star of his on-web series entitled Leon's Life, which ran from 2007 until 2008. Jackson's début album Right Now finished the year as the 75th best-selling album in the UK, and included the singles, Don't Call This Love, Creative and Stargazing.
Jackson's debut single, When You Believe, a cover of a song sung by Whitney Houston and Mariah Carey and composed and written by Stephen Schwartz, sold over 400,000 copies, and was the 92nd best-selling single of the 2000s in the UK, and was the third best-selling of 2007. Jackson had the best selling single from a British Male Artist in 2007 beating the likes of Mika, Take That and Mark Ronson in the best-selling male category, and being beaten by Leona Lewis's Bleeding Love and Rihanna's Umbrella to the number one and number two positions, respectively.
As of 2016, Jackson has had one UK number one single, two UK top ten singles and one UK top five album and overall has spent a total number of thirteen weeks in the UK Singles Charts top seventy-five with his three charted singles and nine-week in the UK Album Charts top seventy-five with his debut album.
His winners single, When You Believe currently ranks as the seventh best-selling X Factor winners single beating off competition from the likes of Little Mix with Cannonball, Sam Bailey with Skyscraper and Louisa Johnson with Forever Young. His debut album also ranks as the eighth best-selling debut album from an X Factor winner, beating Ben Haenow with his self-titled debut album and Joe McElderry with Wide Awake.
