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Carrying high CC balances caused my FICO score to drop to 653. The Score Simulator predicted a rise between 720-750 if I paid down my balances. I paid off all but 2 of my CC and my score increased to 721. My current score is 713 because I forgot to PIF a $16.01 balance by the closing date. The card reported this balance and I was lowered 8 points. I wish I had been able to get a score closer to 750 but I am content with gaining so many points with little effort.
You should see a rise in your score because you paid off your CC. I've never had a CO or an account in collections so I am not sure what impact, if any, this will have on your FICO score. Either way, good luck to you. I hope you get that 630-650.
Here's hoping......
When you get your new score, post it for us so we can see if simulator was accurate or not.
The FICO simulator is intentionally very broad, to the point of being useless.
A detailed and reliable simulator, for any short term accuracy, would subject the scoring algorithm to reverse engineering, and that is something that FairIsaac would not do.
If you want a crystal ball for a year from now, then I would listen to what it says. Anything shorter is useless.