Opening bank accounts does not affect your credit score. Opening credit card accounts may temporarily depress your score slightly. Of course, if you use those wisely, they can also help to build your credit score.
One way to help rebuild your credit score may be to have a credit card that you use ONLY for MS related expenses, pay off every month and do not put any non-business expenses on. It may help to have a separate checking account for MS and make sure that you allow enough of your MS fees to stay in that account, or accumulate there so that you can always pay off the credit card. Then also use that card for printer ink or toner, printer paper, and other MS-related supplies. That will help when you are computing your business expenses at the end of the year. In addition, if you use that cc ONLY for business expenses, if you do have a month when you have an interest charge, that interest will be a valid business expense for tax purposes. So, never, ever, use that cc for personal expenses, just in case.
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