IRS Process and Notices

IRS process and notices pages explain what happens after a return is filed, when IRS records do not line up cleanly, or when the taxpayer needs to understand the next account step. Use this section when the problem in front of you is no longer just “what is this tax term?” but “why did the IRS send this, what record is it using, and what stage of the process am I in?”

Use This Section When

• You received an IRS letter and need to understand whether it is informational, corrective, or part of a more serious asserted-tax path.
• You need to compare what the IRS has on file against what you think was filed or paid.
• The issue is identity, record matching, transcript access, or return security rather than the core tax calculation itself.
• The taxpayer did not file, filed late, or now needs to understand what the IRS may do with third-party reporting data.

Start Here

Identity and Record Matching

• Taxpayer Identification Number
• Employer Identification Number
• Individual Taxpayer Identification Number
• Identity Protection PIN
• Tax Transcript

Notices and Asserted Changes

• IRS Notice
• CP2000 Notice
• Tax Deficiency
• Notice of Deficiency
• Tax Refund
• Balance Due

Nonfiling and Payment Resolution

• Substitute for Return
• Balance Due
• Installment Agreement
• Offer in Compromise

What This Section Covers

• Why the IRS sends notices and what those notices usually signal.
• The difference between ordinary processing, correction requests, and enforcement steps.
• How identity numbers, mismatch reporting, and asserted deficiencies connect.
• How nonfiling and identity-verification terms enter the workflow before or after the IRS account changes.
• The collection-resolution terms that can appear after a balance remains unpaid.
• How notices connect to filing, recordkeeping, and later disputes.

Best Reading Paths

• Start with Tax Transcript if the problem is “what does the IRS show on the account?”
• Start with Taxpayer Identification Number if the main question is which tax ID belongs on the return, notice, or payer document.
• Start with Individual Taxpayer Identification Number if the reader needs the federal-tax-purpose identity number used when an individual is not eligible for an SSN.
• Start with Employer Identification Number if the issue is entity filing, business reporting, or business-account identity.
• Start with IRS Notice if the reader has a letter in hand but does not yet know whether it is informational, mismatch-based, deficiency-related, or collection-related.
• Start with CP2000 Notice if the IRS is pointing to income or reporting records that do not match the filed return.
• Start with Notice of Deficiency if the issue is a formal asserted-tax notice and the reader needs to understand the dispute deadline that follows.
• Start with Tax Refund if the question is why money came back or how refund status is checked.
• Start with Balance Due if the return says money is still owed after filing.
• Start with Installment Agreement if the return or account already shows an unpaid balance and the main question is how payment over time works.
• Start with Offer in Compromise if the reader is trying to separate settlement-for-less from ordinary payment-plan vocabulary.
• Start with Taxpayer Identification Number if the issue is identity matching or the wrong number on a filing record.
• Start with Identity Protection PIN if the problem is filing security or fraud-prevention steps.
• Start with Substitute for Return if the taxpayer did not file and now needs to understand the IRS-built-return path.
• Cross over to Tax Court if the notice path has reached the formal deficiency-dispute stage.
• Cross over to Tax Lien, Tax Levy, and Collection Due Process if the unpaid-balance problem has already reached serious collection notices.

Related Sections

• Tax Forms and Filing
• Penalties and Compliance
• Withholding and Estimated Tax

In this section

• Balance Due
  A balance due is the amount still owed after the return compares final tax liability with withholding, estimated payments, and credits.
• CP2000 Notice
  A CP2000 notice is an IRS notice that commonly relates to reported information that may not match the return the taxpayer filed.
• Employer Identification Number
  Federal tax ID number used to identify businesses and other entities on returns, information reporting, and IRS records.
• Identity Protection PIN
  IRS six-digit filing-security code used to verify the taxpayer and reduce fraudulent return filing.
• Individual Taxpayer Identification Number
  IRS-issued 9-digit taxpayer ID used for federal tax purposes when an individual is not eligible for a Social Security number.
• Installment Agreement
  An installment agreement is a payment arrangement that lets a taxpayer pay an IRS balance over time instead of in one lump sum.
• IRS Notice
  An IRS notice is a written communication from the IRS about a return, account issue, payment matter, or other tax follow-up.
• Notice of Deficiency
  A notice of deficiency is a formal IRS notice asserting that additional tax is owed and moving the matter beyond an ordinary informational letter.
• Offer in Compromise
  An offer in compromise is an IRS settlement program that may let a tax debt be resolved for less than the full amount owed.
• Substitute for Return
  IRS-built return based on available records when a required return was not filed.
• Tax Deficiency
  A tax deficiency is the amount by which the IRS believes the correct tax exceeds the amount shown or paid on a return.
• Tax Refund
  A tax refund is the amount returned to the taxpayer when payments and refundable credits exceed the final tax result on the return.
• Tax Transcript
  IRS record summary used to compare filed-return data, account activity, and notice-related information without pulling a full return copy.
• Taxpayer Identification Number
  Umbrella tax-identity term covering the numbers used on returns, information documents, and IRS account records.