A CP13A notice means the IRS made changes to your Earned Income Credit but it did not change what you owe. The difference between a CP13 notice and a CP13A notice is that the CP13A is specifically for the Earned Income Credit, while the CP13 is for other issues.
The IRS sends a CP23 Notice when it believes you owe more money because you did not pay as much in estimated taxes as you stated on your return. This may be because the IRS didn’t apply a payment, the IRS lost a payment, or the IRS applied a payment to a different tax liability.
The IRS sends a CP32A Notice when your refund check expires without being cashed. It might have gotten lost in the mail, or you may have moved and forgotten to forward your mail.
If you’ve received a CP10A Notice, the IRS believes you made a mistake on your Earned Income Tax Credit and owe more tax than you claimed. The refund you asked to apply towards next year’s estimated taxes is now lower.
If you’ve received a CP10 Notice, the IRS believes you made a mistake on your tax return and owe more tax than you claimed. The refund you asked to apply towards next year’s estimated taxes is now lower.
A CP16 Notice is good news and bad news. The IRS believes you made a mistake on your return and are entitled to a refund. But you owe taxes for a different year, so the IRS is keeping your refund to pay that debt.
If you received a CP45 Notice from the IRS, it means that they can’t apply your refund to your estimated taxes as you requested. Instead, they will apply your refund to a previous tax debt.