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I am not an expert, but from what I have learned here, you should use it when you make purchases, and then pay in full right before the statement cuts. Check your statement for the last billing day and pay it off about 2 days before it cuts.
I am not sure that will give you the kind of boost you need though. You may need to try to get a small loan from a local bank or CC and pay if off about 3 months before you apply for a mortgage? (okay I missed the part that you want to apply in Feb. Disregard this one!!)
We are finally homeowners!!
Closed May 5th-30 yr fixed at 5.25%.
Use your BoA card and let a small balance report so you can get the boost for showing use of a credit card. You have a 4k CL so keep it under 400 and you should be fine. If you don't want to use that much, that is ok too. Just so long as it reports something.
The Green is a charge card not a revolver, so it's scored differently.