Introduced by the Finance Act 2004, one of the forms of transitional protection available for members of registered pension schemes (www.practicallaw.com/5-201-6474) who accrued pension rights before 6 April 2006. A member whose rights were valued at more than £1.5 million at that date could register with HM Revenue & Customs (HMRC) (www.practicallaw.com/6-200-6399) before 6 April 2009 to have those rights protected from a tax charge because those rights exceeded the lifetime allowance (www.practicallaw.com/8-201-6477). The member with primary protection gains a personal enhanced lifetime allowance that increases until retirement in proportion with increases to the standard lifetime allowance. The member can continue to accrue further pension benefits without paying a tax charge, but will incur a charge on amounts that exceed his or her enhanced lifetime allowance. See also enhanced protection (www.practicallaw.com/4-204-0653) and fixed protection (www.practicallaw.com/6-507-1857).