As you can see from the above rules, the presence or absence of a credit limit will determine how that closed card influences your score — particularly in
the combined utilization calculations that look at your card usage in total.
Conversely, if the closed card has a lower percentage than the other card (s), it's helping your score — and thus could hurt it by being excluded from
combined utilization calculations.
Not exact matches
Since store cards are included in credit
utilization (balance / limit percentage)
calculations, along with credit cards, I'm guessing that the $ 9K balance is taking up a good portion of that card's credit limit and, depending on how you pay it over the 12 months, is likely to continue contributing to a higher
combined utilization percentage than you'd otherwise be seeing.
Once added to your credit file, the latest account balance and credit limit on the authorized user card will be included in your own credit
utilization calculations that look at both individual and
combined card usage.
Then, going forward, you'll want to continue reducing those balances further, using these same
calculations until your individual and
combined utilization percentages fall within the 1 - 9 percent range.