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I want to bring a CC account to 0, if I make a online payment today, with the closing being tomorrow. Will it report a 0 balance to CRAs or is a day before to late?
Depends on the lender. Some are super quick to update, some take a day or two.
Yup, what @Anonymous said. And if it's Chase in particular, they will report whenever you pay to zero.
Some lenders will also update a report mid-cycle if you call and ask, in case a balance does end up reporting.