There isn't a set period of time you have to wait after declaring bankruptcy, but credit rebuilding is something you want to start as soon as possible. A bankruptcy will stay on your credit report for up to 10 years, which will make obtaining lines of credit much more difficult. Fortunately, secured credit cards are easier to get approved for than other credit cards because of the security deposit acting as a guarantee that the creditor will recover what you owe in case you decide to become delinquent. So your best bet would be to apply for a secured credit card, and our Editors have already selected their Top Picks here. You might also be interested in this article which offers helpful tips on credit rebuilding.