Citi has a 48-month rule for most of its credit cards that prevents somebody from collecting more than one welcome bonus every four years. In other words, you can apply to several Citi credit cards over the next 48 months, but you'd only get one welcome bonus (the first one you applied to). If you apply for another Citi credit card 48 months or longer after getting the welcome bonus, you’d then be eligible to earn another bonus.