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How Often Should I Chase a Credit Card Signup Bonus?
See the accepted answer for this question.  What effect will credit card churning for frequent flyer miles have on my credit score? This does not directly answer 'how often...' that you asked, but it states that the answerer opens 5-15 accounts per year.  So the answer to your question is, as often as you want, as long as you manage your account ages. The reason for this is that there are two factors in opening a new account that affect your credit card score.  One is average age of accounts. The other is credit inquiries.  That answerer, with FICO in high 700s, sees about a 5% swing based on new cards and closing old ones. You'll have to manage average age of accounts.  I assume this is done by keeping some older ones open to prop up the average, and by judiciously closing the churn accounts. Finally, if you choose to engage in churning, and you intend to apply for a large loan and want a good credit score, simply pause the account open/close part of the churn a couple of months ahead of time.  Your score should recover from the temporary hits of the inquiries.   The churning communities really do have how to guides which discuss the details of this.  Key phrase: credit card churning.