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Whats there to lose? To be honest a $20k difference is probably indifferent to Amex, you'll still get the BCP regardless as long as you comply.
Just a quick tip. If you DO decide to complete the 4506-T, do NOT forget/miss the little checkbox at the bottom of the form. I think it's in reference to attesting you are an authorized signatory or something similar.
If you forget to check this box, no error occurs, however you will probably wind up in the 4506-T Black hole with Amex. They will NOT let you know that your form was rejected and you will sit in 4506-T purgatory until you A: Try again or B:finally call only to find out you've been rejected, and hopefully get someone who will tell you how to fix it. LOL
Others may disagree based on their experience but in my case, the income wasn't so much what they seemed concerned about but it seemed more like they were just making sure I was a legit tax payer. In my case, I got an AmEx with a $10K limit, immediately put an $8200 charge on it, then paid it as soon as it posted. Charged the other payment of $8200 right after (total charges of $16400).
Then I got a letter in the mail with my pin number for cash advances and called in to change it and got put thru to the credit department who wanted the 4506T for to "verify my ability to pay". I explained to her that my tax return filed in 2016 would not show my current retirement income of $40K since most came from the sale of my house and money inherited. She said they still needed to see them so I gave them to them. BTW, the income shown on the tax return was about $9600. After I faxed them to her, I called to confirm she received them since I had read about the 4506T black hole, and a few days later got a call from her that everything was ok with the account and no change to the $10K limit.
I would recommend calling the number provided and explaining to them about the income change and that the previous years income wont reflect current income. They should be use to most people increasing their income each year thru raises. As the others have said, nothing to lose.
I appreciate all the advice on this issue, but to clear it up I was approved for the ED on April 19th for 1k SL, and then the BCE for 10k on April 27th. This 4506 requested was for the BCP, and I'm just going to let it pass. I'm just going to grow my cards that I have with them, slowly, and if they request a 4506 for increases I will surely use the advice you all gave me. Thank you!