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What did you notice in your scores on the 1st of the month?
My youngest account which is discover it recently turned a year old this month, in fact my statement came out today & I got a 12 point boost from my utilization going from 23% to 14%. The balance is now 559/2600 but shouldn't I have gotten a bigger increase though in addition to lowering my utilization?
No. Movement from 23% to 14% utilization (or vice versa) would not result in a score change related to utilization. Thresholds exist at 8.9% and 28.9% and your movement before/after was within that range. Without crossing either of those thresholds, you wouldn't expect to see a score change from utilization.
That being said, I believe the 12 point gain you received likely was from your AoYA reaching 12 months. What's throwing you off here is that the alert you received referenced your balance paydown. At that time you were provided with a new score, but that new score wasn't as a result of the alert (balance paydown). Your AoYA reaching 12 months is not an alertable event, so the points gained from that would come without notice (no alert).
You wouldn't get a scoring bump going from 23% to 14% because you didn't cross over any scoring threshold. The points gain was probably for AoYA because all age related changes happens on the 1st of the month (if the Discover was opened in the month of Nov 2017) as maize hinted.
Edit: beaten by BBS
The credit reporting agencies use the 1st of the month when calculating account age. So if you were monitoring your credit scores you should have noticed a score increase on Nov. 1.