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CP521 notice: IRS Installment Agreement Payment Reminder

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Last updated 11/01/2024 by
SuperMoney Team
Fact checked by
Ante Mazalin
Summary:
The CP521 Notice is issued by the IRS as a reminder that a payment is due under your installment agreement. This notice is typically sent when you have established a payment plan with the IRS to settle taxes owed over time. The CP521 Notice does not indicate a missed payment but serves as a notification of an upcoming payment. It’s important to ensure timely payments to avoid penalties and potential cancellation of the agreement. This article explains what the CP521 Notice entails, how to manage your IRS installment agreement, and what steps you should take to stay compliant.
Receiving a notice from the IRS can be concerning, especially when it involves an ongoing payment agreement. If you receive a CP521 Notice, it’s a friendly reminder from the IRS that you have an installment agreement in place, and a payment is due. This notice is crucial to keep track of, as failing to make the necessary payments can lead to penalties, interest, or even defaulting on your agreement.
Understanding the implications of the CP521 Notice and knowing what steps to take is essential for maintaining good standing with the IRS. In this article, we will explain what a CP521 Notice is, how it affects your payment plan, and how to respond effectively.

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What is a CP521 notice?

The IRS CP521 Notice is an official reminder sent to taxpayers who have entered into an installment agreement with the IRS. This notice serves as a reminder that your next installment payment is due under the agreement you have established to resolve outstanding tax debt.
It’s important to understand that receiving a CP521 Notice does not mean you’ve missed a payment. Instead, the IRS sends this notice to remind you of an upcoming payment to ensure you remain compliant with your agreement. If you fail to make the payment on time, it could lead to further action, including penalties or termination of the agreement.

Why did I receive a CP521 Notice?

The IRS sends out a CP521 Notice if you have a valid installment agreement and a scheduled payment is approaching. Typically, these notices are sent each month as a reminder of the payment due date and the amount you owe for that period.
Receiving this notice means that you have an installment agreement in place with the IRS, and you are expected to make consistent payments to satisfy your tax debt over time. These notices are part of the IRS’s standard procedure to ensure taxpayers meet their payment obligations under their agreement.

Pro tip

  • Set up automatic payments: To avoid missing an installment payment, consider enrolling in automatic payments through the IRS’s Electronic Federal Tax Payment System (EFTPS). This way, you’ll never have to worry about remembering due dates.
Struggling with IRS notices? If you’ve received an IRS letter and aren’t sure how to handle it, you might want to explore professional tax relief options. Optima Tax Relief has helped thousands of people resolve their tax issues and get back on track with the IRS. Learn more about how they can assist you with your situation.

How the CP521 notice affects your IRS installment agreement

When you receive a CP521 Notice, it is a signal that your installment agreement is still active, and the IRS expects your timely payments. The installment agreement allows you to break down your total tax debt into manageable monthly payments. However, missing even a single payment can jeopardize the entire agreement.

Maintaining compliance

The CP521 Notice reminds you to stay on track with your installment payments. As long as you make your payments on time and in full, your agreement remains in good standing. Failing to do so can lead to additional fees, penalties, or the cancellation of your installment agreement. Once an agreement is canceled, the IRS may take more aggressive collection actions, such as wage garnishments or bank levies.

What happens if you miss a payment?

While the CP521 Notice itself does not indicate that you’ve missed a payment, it’s important to take these reminders seriously. If you do miss a payment or fail to make it in a timely manner, you could receive a different notice, such as a CP523, which indicates that your installment agreement is at risk of default.
Missing a payment may also result in interest and late payment penalties being added to your balance, increasing the total amount you owe.

What should you do when you receive a CP521 notice?

Receiving a CP521 Notice is a call to action to ensure your payments are on time. Here’s what you should do immediately upon receiving this notice:
  • Read the notice carefully: Make sure you understand the payment amount due, the due date, and any other important information.
  • Verify the accuracy of the information: Check that the payment amount and due date align with your records. If something seems off, you may need to contact the IRS for clarification.
  • Make your payment on time: Use the payment options provided in the notice, which may include paying online, by phone, or by mail.
  • Track your payment history: Keep a record of all payments made under your installment agreement to ensure there are no discrepancies in your account.

Pro tip

  • Keep a detailed payment record: Always keep copies of your CP521 notices, payment confirmations, and any communication with the IRS. In case of discrepancies, having a detailed record can help you quickly resolve any issues.

Payment options for your IRS installment agreement

The CP521 Notice usually provides several methods for making your payments. Here’s an overview of the common options:

Pay online

One of the fastest and easiest ways to make your installment payment is through the IRS website. The IRS offers several online payment methods, including:
  • Direct Pay: This service allows you to make payments directly from your checking or savings account.
  • Debit or credit card: The IRS accepts debit and credit card payments, although there may be additional fees for using this option.
  • Electronic Funds Withdrawal (EFW): If you prefer a more automated approach, you can set up EFW to deduct payments directly from your bank account on a scheduled basis.

Pay by mail

You can also send a check or money order by mail. Be sure to include the payment coupon from the CP521 Notice and write your IRS installment agreement number and Social Security number on the check to ensure proper processing.

Pay by phone

Some taxpayers prefer to make their payments over the phone. The IRS offers an automated phone system that allows you to pay your balance using a debit or credit card.

Enroll in the Electronic Federal Tax Payment System (EFTPS)

The Electronic Federal Tax Payment System (EFTPS) is another convenient option for managing your installment payments. EFTPS allows you to schedule payments, track your payment history, and view account balances online. Enrollment is free, and it offers a high level of control and flexibility.

How to respond to the CP521 notice

Responding to a CP521 Notice is straightforward. You simply need to make your payment by the due date indicated on the notice. However, there are a few additional steps you may need to take depending on your situation:

Steps to take when responding to a CP521 notice

  • Verify your payment details: Ensure that the payment amount and due date listed on the CP521 Notice match what was agreed upon when you set up your installment plan.
  • Make your payment: As discussed, you have several options for making your payment, including online, by mail, and by phone.
  • Contact the IRS if needed: If the information on the notice is incorrect, or if you’re unable to make the payment on time, contact the IRS immediately to discuss your options.

What if you can’t make the payment?

If you are facing financial hardship and cannot make your installment payment on time, it’s crucial to communicate with the IRS before the due date. Ignoring the payment or failing to respond to the notice can result in penalties and cancellation of the agreement. The IRS may offer alternative arrangements, such as:
  • Temporarily adjusting your payment plan: In some cases, the IRS may be willing to modify your payment plan or grant a temporary reprieve from payments if you are experiencing significant financial difficulties.
  • Requesting a payment extension: You may be able to request a short-term extension to make your payment.

Pro tip

  • Contact the IRS early if you face financial hardship: If your financial situation changes and you can’t make a payment, reach out to the IRS as soon as possible. They may offer temporary relief or adjust your payment plan to prevent the cancellation of your agreement.

Potential penalties or next steps if you don’t respond

Failing to respond to a CP521 Notice or missing a payment can lead to several consequences, including:
  • Interest and late payment penalties: The IRS will add interest and penalties to your balance for late or missed payments.
  • Termination of your installment agreement: The IRS may terminate your installment agreement if you miss a payment without contacting them in advance to make arrangements.
  • Collection actions: Once an installment agreement is terminated, the IRS may take more aggressive steps to collect the outstanding debt, including wage garnishment, bank account levies, and tax liens.
To avoid these penalties and ensure your installment agreement stays in place, it’s essential to make timely payments or communicate with the IRS if you cannot.
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Frequently asked questions

Why did I receive a CP521 Notice?

You received a CP521 Notice because you have an active IRS installment agreement, and a payment is due. This notice serves as a reminder to ensure you make your payment on time.

What happens if I ignore the CP521 Notice?

Ignoring the CP521 Notice can lead to late payment penalties, interest charges, and even the cancellation of your installment agreement. Once the agreement is canceled, the IRS may take more aggressive collection actions.

Can I change my payment plan if I can’t make the scheduled payments?

Yes, if you are unable to make your scheduled payment, contact the IRS immediately to discuss modifying your payment plan. They may offer a temporary adjustment based on your financial situation.

What are my payment options for the installment agreement?

You can pay online via Direct Pay, debit or credit card, or Electronic Funds Withdrawal. You can also mail a check or money order or make payments over the phone.
Need help understanding other IRS letters and notices? Visit our comprehensive guide to IRS Letters and Notices or search for the document you received in the table below.
IRS Letter or Notice Number
Notice Description
CP01The IRS verified your claim of identity theft and will monitor your account.
CP01HThe IRS received a tax return with a social security number that belongs to a dead person.
CP02HMoney is due on an amended return based on a grant received due to Hurricane Katrina, Rita, or Wilma.
CP03CYou received the First-Time Homebuyer Credit for a house you purchased.
CP04You may be eligible for tax deferment because either you or a spouse served in a combat zone, a qualified contingency operation, or a hazardous duty station during the tax year specified on your notice.
CP08You may be entitled to additional money due to the Additional Child Tax Credit.
CP10Your tax return changed due to a miscalculation, and the refund you wanted to apply to an estimated tax payment has changed.
CP10AYour tax return changed due to a miscalculation of the Earned Income Credit, and the refund you wanted to apply to an estimated tax payment has changed.
CP11You owe money because the IRS amended your return due to a miscalculation.
CP11AYour tax return changed due to a miscalculation of the Earned Income Credit, and the refund you wanted to apply to an estimated tax payment also changed.
CP11MYour tax return changed due to a miscalculation of the Making Work Pay and Government Retiree Credit, and the refund you wanted to apply to an estimated tax payment has changed.
CP12You are due a bigger refund because the IRS corrected one or more mistakes on your tax return.
CP12AThe IRS made changes to correct the Earned Income Credit (EIC) claimed on your tax return.
CP12E or CP12FThe IRS corrected a miscalculation on your return.
CP12MThe IRS made changes to the computation of the Making Work Pay and/or Government Retiree Credits on your return.
CP12RThe IRS made changes to the computation of the Rebate Recovery Credit on your return.
CP13The IRS made changes to your return due to a miscalculation. There is no refund or amount due. Your balance is zero.
CP13AThe IRS made changes to your return due to a miscalculation of the Earned Income Credit. There is no refund or amount due. Your balance is zero.
CP13MThe IRS made changes to your return due to a miscalculation of the Making Work Pay credit or the Government Retiree Credit. There is no refund or amount due. Your balance is zero.
CP13RThe IRS made changes to your return due to a miscalculation of the Recovery Rebate Credit. There is no refund or amount due. Your balance is zero.
CP14You owe money on unpaid taxes.
CP16The IRS made changes to your return due to a miscalculation. The refund you were due was applied to other tax debts.
CP21AYou owe money due to the changes you requested that the IRS make on your tax returns.
CP21BYou are due a refund due to the changes you requested that the IRS make on your tax returns. The money should arrive within 2 to 3 weeks.
CP21CThe IRS made the requested changes to your tax return. You will not receive a refund, and there is no tax due. Your balance is zero.
CP21EAs a result of your recent audit, the IRS made changes to your tax return, and you owe money as a result of those changes.
CP21IThe IRS made changes to your tax return relating to the Individual Retirement Arrangement (IRA) taxes. You owe money due to the changes.
CP22AThe IRS made the changes you requested, and you owe money as a result.
CP22EAs a result of your recent audit, the IRS changed your tax return, and you now owe money.
CP22IThe IRS made changes to your tax return relating to the Individual Retirement Arrangement (IRA) taxes. You owe money due to the changes.
CP23The IRS changed your return because there was a difference between the amount of estimated tax payments listed on your tax return and the amount actually posted to your account. You owe taxes due to these changes.
CP24The IRS changed your return because there was a difference between the amount of estimated tax payments listed on your tax return and the amount actually posted to your account. This resulted in an overpayment of estimated taxes.
CP24EThe IRS changed your return because there was a difference between the amount of estimated tax payments listed on your tax return and the amount actually posted to your account. This resulted in an overpayment of estimated taxes.
CP25The IRS changed your return because there was a difference between the amount of estimated tax payments listed on your tax return and the amount actually posted to your account. You are not due a refund, nor do you owe any money. Your balance is zero.
CP31You need to update your address because your refund check was returned to the IRS.
CP45The IRS was unable to apply your overpayment to your estimated tax as you requested.
CP49The IRS used all or part of your refund to pay a tax debt.
CP53Your refund check will be sent by mail because the IRS can’t provide your refund through direct deposit.
CP57The bank declined your payment, so the IRS was unable to draft funds from your bank account.
CP71A reminder of the amount you owe in tax, penalty, and interest.
CP71AA reminder of the amount you owe in tax, penalty, and interest.
CP71CA reminder of the amount you owe in tax, penalty, and interest.
CP71DA reminder of the amount you owe in tax, penalty, and interest.
CP88The IRS is holding your refund because you haven't filed one or more tax returns, and it believes you will owe tax.
CP90The IRS is notifying you of its intent to levy certain assets for unpaid taxes. You have the right to dispute the levy in a Collection Due Process hearing.
CP91The IRS will levy up to 15% of your social security benefits for unpaid taxes.
CP120The IRS needs documentation of your tax-exempt status.
CP120AYour organization’s tax-exempt status has been revoked because it failed to file a Form 990 series return for three consecutive years.
CP130You may no longer need to pay the Alternative Minimum Tax (AMT) because your tax return filing requirements changed.
CP152The IRS received your return.
CP153The IRS will send your refund by mail because your direct deposit did not go through.
CP161You have an unpaid balance due to the IRS.
CP166Your monthly payment to the IRS did not go through due to insufficient funds in your bank account.
CP178You may no longer owe excise tax because your tax return filing requirements changed.
CP231You need to update your address because your refund was returned to the IRS.
CP259You did not file the business tax return identified in the notice.
CP259AYou should have filed these forms but did not – Form 990/990-EZ, Return of Organization Exempt From Income Tax, or Form 990-N (e-Postcard).
CP259BThe IRS requires you to file these forms but did not – Form 990-PF, Return of Private Foundation or Section 4947(a)(1) Nonexempt Charitable Trust Treated as a Private Foundation.
CP259CThe IRS believes that you are a private foundation, but did not file the required Form 990-PF, Return of Private Foundation or Section 4947(a)(1) Nonexempt Charitable Trust Treated as a Private Foundation.
CP259DYou must file this form, but you did not – Form 990-T, Exempt Organization Business Income Tax Return.
CP259EYou should have filed this form, but you did not – Form 990-N (e-Postcard) or Form 990/990-EZ, Return of Organization Exempt From Income Tax.
CP259FThe IRS requires you to file this form but did not – Form 5227, Split-Interest Trust Information Return.
CP259GThe IRS requires you to file this form, but you didn’t – Form 1120-POL, U.S. Income Tax Return for Certain Political Organizations.
CP259HAs a tax-exempt political organization, you must file this form, but you did not – Form 990/990-EZ, Return of Organization Exempt From Income Tax.
CP276AYou submitted your tax liability schedule incorrectly. The IRS typically charges a Federal Tax Deposit (FTD) penalty for this but did not this time.
CP276BThe IRS did not receive the correct amount of tax deposits. It normally charges a Federal Tax Deposit (FTD) penalty but did not this time.
CP297The IRS is notifying you of its intent to levy certain assets for unpaid taxes. You have the right to dispute the levy at a Collection Due Process hearing.
CP297AThe IRS has levied your assets for unpaid taxes. You have the right to dispute the levy at a Collection Due Process hearing.
CP298The IRS notifying you of its intent to levy up to 15% of your social security benefits for unpaid taxes.
CP501You have a balance due on one of your tax accounts.
CP503You have an unpaid balance on one of your accounts, and the IRS has not heard from you.
CP504You have an unpaid amount due on your account. If you do not pay immediately, the IRS will levy your state income tax refund to apply it to the amount you owe.
CP504BYou have an unpaid amount due on your account. If you do not pay immediately, the IRS will levy certain property or rights to property to apply it to the amount you owe.
CP521A reminder that you have an installment agreement payment due.
CP523You have defaulted on your payment agreement. Therefore the IRS is terminating the agreement and will levy your assets.
CP601Usted tiene un saldo pendiente de pago (dinero que le debe al IRS) en una de sus cuentas contributivas.
CP603No hemos recibido respuesta de parte de usted y todavía tiene un saldo sin pagar en una de sus cuentas contributivas.
CP604Usted tiene un saldo sin pagar en su cuenta. De no pagar esta cantidad inmediatemente, el IRS embargará cualquier reembolso de impuestos estatales al que tenga derecho y aplicarlo al pago de su deuda.
CP604BUsted tiene un saldo sin pagar en su cuenta. De no pagar esta cantidad inmediatemente, el IRS embargará ciertas propiedades o derechos de propiedad y lo aplicará al pago de su deuda.
CP621Este aviso es para notificarle que usted tiene un plan de pagos a plazos vencido. Por favor, envíe el pago inmediatamente.
CP623Este aviso es para informarle nuestra intención de cancelar su plan de pagos a plazos y confiscar (embargar) sus bienes. Usted incumplió en su acuerdo.
CP711Nosotros realizamos cambios a su planilla debido a que entendemos que hubo un cálculo erróneo. Como resultado de estos cambios, usted adeuda dinero por sus contribuciones.
CP721Hicimos el(los) cambio(s) que usted solicitó a su declaración de impuestos para el año tributario que aparece en su aviso. Como resultado de éste(estos) cambio(s) usted debe dinero en sus impuestos.
CP722Hicimos el(los) cambio(s) que usted solicitó a su declaración de impuestos para el año tributario que aparece en su aviso. Como resultado de éste(estos) cambio(s) usted debe dinero en sus impuestos.
CP771Usted recibió este aviso para recordarle sobre la cantidad que adeuda en contribuciones, multas e intereses.
CP772Usted recibió este aviso para recordarle sobre la cantidad que adeuda en contribuciones, multas e intereses.
CP773Usted recibió este aviso para recordarle sobre la cantidad que adeuda en contribuciones, multas e intereses.
CP774Usted recibió este aviso para recordarle sobre la cantidad que adeuda en contribuciones, multas e intereses.
CP959Usted no radicó su planilla de contribución de negocios identificada en este aviso.
CP2000The income or payment information on file doesn’t match your tax return. The discrepancy may result in an increase or decrease in your tax due.
CP3219AThe IRS has received information that is different from what you reported on your tax return. This may result in an increase or decrease in your tax.
CP3219NThe IRS didn’t receive your tax return, so it calculated your return based on the information received from employers, financial institutions, and others. If you want to challenge the proposed tax, you have 90 days from the date of this notice. If you are outside the country, you have 150 days.
Letter 0012CThe IRS needs additional information to process your tax return.
Letter 0484CThe IRS wants a completed
Letter 0525Updates you on proposed changes after an IRS examination. Any changes are explained and details the refund due or taxes owed.
Letter 531IRS Notice of Deficiency. The information the IRS received about you was different from what you reported on your return.
Letter 0668D(LP 68)The IRS released their levy.
Letter 0549CYour tax bill was paid.
Letter 0681CThe IRS accepted your payment proposal. However, this is not a formal Installment Agreement.
Letter 0757CYou did not adhere to the terms of your Installment Agreement.
Letter LT 11The IRS plans to seize your property or rights to property.
Letter 1058The IRS has not received your payment. It plans to seize your property or rights to property.
Letter 1615 (LT 18)You must respond to the IRS within 10 days of this notice regarding past due tax returns.
Letter 1737 (LT 27)Complete and sign Form 433F, Collection Information Statement.
Letter 1961CYour application for a Direct Debit Installment Agreement was declined. It explains why and what you need to do to qualify.
Letter 1962CYour application for a
Letter 2050 (LT 16)The IRS is trying to collect unpaid taxes from you from returns that have been filed or from returns that have not been filed.
Letter 2257CThe IRS is providing the payoff amount that you requested.
Letter 226-JAn IRS letter to large employers notifying them that they may be liable for an Employer Shared Responsibility Payment (ESRP).
Letter 2271CA request for an Installment Agreement has been approved. It explains the fees and how to qualify for a Low Income Fee Reduction. The letter may also request missing information.
Letter 2272CAn IRS letter explaining why your request to pay the balance due in installments was declined.
Letter 2273CA confirmation letter of your request to pay the balance due in installments. It contained the amount to pay, fees charged, and where to send payment. Instructions on how to apply for the Low Income Fee Reduction included.
Letter 2318CA response to a request to pay taxes due to payroll deductions. It also explains the fees that are charged.
Letter 2357CThe IRS is admitting that it did not send you the balance due notices that it should have.
Letter 2603CThe IRS accepted your installment agreement. The IRS will file a Notice of Federal Tax Lien on your personal property.
Letter 2604CThe IRS has accepted your request for installment payments. This IRS letter provides the monthly payment, the address where to send it, and the fees charged. The letter also provides instructions on how to apply for the Low Income Fee Reduction.
Letter 2761CThe IRS is requesting your combat zone service dates to ensure that it provides you with the special provisions and protection of the combat zone deferment. Copies of military orders or other documentation to support your time served may be requested. Civilians working in support of the Armed Forces may be required to provide a Letter of Authorization or a letter from their employer.
Letter 2789CAn annual reminder notice, as required by law, of the balance due to the IRS. It explains that penalties and interest continue to accrue until the balance is fully paid.
Letter 2840CConfirms your Installment Agreement request and includes the payment amount and due date. This IRS letter explains the fees charged for paying monthly and explains how to apply for the Low Income Fee Reduction (if you qualify).
Letter 3030CProvides an explanation of the tax, penalty, and interest still due on your account.
Letter 3127CA confirmation of your request to make a change to your Installment Agreement. This IRS letter explains the fees for the change. Changes can be to the payment amount or due date, or it can include additional liabilities.
Letter 3174A reminder of taxes due after the IRS has sent a Notice of Intent to Levy.
Letter 3217CThe IRS has accepted your request to pay the balance in installments. This IRS letter provides your payment amount, the due date, and fees charged. The letter also provides instructions on applying for the Low Income Fee Reduction (if you qualify).
Letter 3228 (LT 39)A request to pay the balance due within 10 days using the envelope provided.
Letter 3500The IRS has received your documents, and it needs additional time to review them.
Letter 3572Your Federal Income Tax Return has been selected for examination. The IRS auditor requests that you call to schedule an audit appointment.
Letter 4883CThe IRS received your federal income tax return but needs more information to verify your identity in order to process your tax return accurately.
Letter 4903 (LT 26)You must file your tax returns immediately. The IRS has previously contacted you, but it did not receive a response.
Letter LP 47The IRS is trying to locate the person identified in the letter and is requesting that you provide their new address.
Letter LP 59The IRS has not received a response to the notice of levy it previously sent.
Audit Letter 2205The IRS manages audits either by mail or through an in-person interview to review your records. The interview may be at an IRS office (office audit) or the taxpayer’s home, place of business, or accountant’s office (field audit).
Letter 915You recently underwent an audit, and the IRS informs you that you now owe taxes.

Key takeaways

  • A CP521 Notice is a reminder from the IRS that a payment is due under your installment agreement.
  • Receiving this notice does not mean you missed a payment, but it is important to make timely payments to avoid penalties.
  • Failure to respond to or act on the notice can result in penalties, interest, and the possible cancellation of your payment agreement.
  • You have multiple payment options, including paying online, by mail, or over the phone, to fulfill your IRS installment obligations.
  • If you are unable to make the payment, contact the IRS immediately to discuss adjusting your payment plan.

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