What this notice is about We were unable to credit the full amount you requested to the succeeding tax period. What you need to do You don't need to do anything if you agree with the notice. Read and review your notice carefully. It will explain why we were unable to apply the amount you requested to the succeeding tax period. It may also suggest additional steps for you to take, depending on your situation. Compare our changes to the information on your tax return. Correct the copy of your tax return that you kept for your records. Adjust this year's tax payments to avoid any possible underpayment. Frequently asked questions What should I do if I disagree with the changes you made? If you disagree, contact us at the toll-free number listed on the top right corner of your notice within 60 days. What do I say when I call the IRS? Mention that you received a CP145 notice and you need to review your account. Be sure to have a copy of your notice and your tax return before you call. What should I do if I find you misapplied a payment or haven't credited a payment that I made? Contact us with your information at the toll-free number listed on your notice. Please have your documentation (such as cancelled checks, amended return) ready when you call. We'll discuss the issue with you and give you further instructions. What if I need to make another correction to my account? You'll need to file an amended return. What if I have tried to get answers and after contacting IRS several times have not been successful? Call Taxpayer Advocate at 877-777-4778 or for TTY/TDD 800-829-4059. Tips for the next tax period Make sure that you claim the proper amount of credit on your next tax return. You may need to adjust your estimated tax payments or your federal tax deposits. Reference Tools Publication 1, Your Rights as a TaxpayerPDF Full list of tax forms and instructions Need Help? You can authorize someone to contact the IRS on your behalf. See if you qualify for help from a Low Income Taxpayer Clinic. If you can’t find what you need online, call the IRS number at the top of your notice or letter.