For a mortgage lender, one of the most important questions in the loan process is simple: Can the income information provided by the borrower be independently verified?
Pay stubs, W-2s, tax returns, 1099s and financial statements supplied by an applicant are important underwriting documents, but they generally originate with the borrower, an employer, an accountant or another private source. IRS tax transcripts provide something different: tax information obtained directly from the federal government.
That is where IRS Form 4506-C, IVES Request for Transcript of Tax Return, becomes important.
Form 4506-C allows a taxpayer to authorize an approved participant in the IRS Income Verification Express Service, commonly known as IVES, to obtain specified tax transcript information from the IRS. Lenders, banks, credit unions, mortgage companies and other financial institutions use the IVES process to independently verify income and tax information during loan origination, underwriting, quality control and other verification procedures.
What Does Form 4506-C Actually Do?
A 4506-C is an authorization form. It is not a tax return, and it does not provide the lender with permission to make changes to a taxpayer's IRS account.
Instead, the taxpayer authorizes the release of specifically requested IRS transcript information through the IVES program.
The form identifies:
- The taxpayer whose records are being requested
- The taxpayer's Social Security number or other taxpayer identification number
- Current and, when applicable, previous name and address information
- The IVES participant authorized to receive the transcript
- The lender or other client requesting the information
- The particular type of IRS transcript being requested
- The tax form involved, such as Form 1040, 1065 or 1120
- The specific tax years or periods requested
- The taxpayer's authorization and signature
The taxpayer therefore controls exactly what information is authorized for release.
From a lender's perspective, the 4506-C creates the authorization necessary to obtain IRS-sourced information that can then be compared with information contained in the loan file.
Why Do Mortgage Lenders Use a 4506-C?
Mortgage underwriting is built around verification.
A borrower may submit a copy of a Form 1040 showing a certain amount of income. A self-employed applicant may provide business returns. Another borrower may provide W-2s or 1099s.
The lender still needs to determine whether those documents and the income represented by them are consistent with information reported to the IRS.
A 4506-C allows the lender to obtain that independent source of verification.
For example, assume an applicant provides a 2025 federal income tax return showing $175,000 of income. A lender can request an IRS transcript for the appropriate period and compare the IRS information with the return used during underwriting.
If the information agrees, the transcript provides additional support for the income documentation in the loan file.
If it does not agree, the discrepancy may require further investigation.
That does not automatically mean fraud occurred. Differences can result from amended returns, processing issues, timing differences, incorrect tax documents, borrower mistakes or other legitimate circumstances.
But from a lender's risk-management perspective, a material discrepancy is something that should be understood before the loan closes.
What Types of Transcripts Can Be Requested?
Form 4506-C supports several types of IRS transcripts.
Tax Return Transcript
A Tax Return Transcript generally contains most of the line-item information from the taxpayer's originally filed tax return, along with related forms and schedules. It generally does not reflect changes made after the original return was filed.
The IRS itself notes that a Tax Return Transcript commonly meets the needs of institutions making mortgage loans.
For a lender, this transcript can be extremely useful when comparing the tax return in the underwriting file with the information recorded by the IRS.
Account Transcript
An Account Transcript provides information about the taxpayer's IRS account, including items such as filing status, taxable income and certain subsequent account activity.
Unlike the Tax Return Transcript, an Account Transcript can reflect changes made after the original return was filed.
Record of Account
A Record of Account combines information from the Tax Return Transcript and the Tax Account Transcript.
This can be particularly useful when a lender needs a broader picture of both the return as originally filed and subsequent IRS account activity.
Wage and Income Transcript
A Wage and Income Transcript contains information reported to the IRS by third parties, such as employers, financial institutions and other payers.
Depending on the taxpayer, this may include information reported on documents such as:
W-2s, 1099s and other information returns.
For lenders, Wage and Income information can provide another valuable layer of verification because it helps establish what income-reporting documents were actually reported to the IRS.
Form 4506-C allows Wage and Income requests to be further limited to specified forms when appropriate. If no particular forms are entered in the applicable section, IRS instructions provide for the available forms to be supplied for the listed taxpayer or taxpayers.
The 4506-C Is Especially Important for Self-Employed Borrowers
The value of IRS transcript verification becomes even more apparent when underwriting self-employed borrowers.
A salaried employee may have a comparatively straightforward income picture consisting primarily of salary and W-2 income.
A self-employed borrower may have income flowing through:
- Form 1040
- Schedule C
- Schedule E
- Form 1065 partnerships
- Form 1120 corporations
- Form 1120-S S corporations
- K-1s and other supporting schedules
Determining qualifying income can therefore require the lender to evaluate both personal and business tax information.
Form 4506-C can be used to request transcripts relating to individual and business returns when properly completed and authorized.
The form specifically allows a tax form number such as 1040, 1065 or 1120 to be identified when requesting Return, Account or Record of Account transcripts. The IRS requires only one tax form number per request for these Line 6 transcript requests.
This distinction matters. A lender requesting an individual 1040 transcript and a business 1120-S transcript, for example, must structure the requests correctly rather than simply listing multiple return types in the same Line 6 request.
Why Accuracy on the 4506-C Matters
The 4506-C may appear to be a relatively simple form, but seemingly minor errors can cause an IRS request to be rejected.
The current IRS form specifically warns that a request can be rejected when the form is incomplete or illegible.
Common problem areas include incorrect or incomplete:
- Taxpayer names
- Social Security numbers or EINs
- Current addresses
- Previous addresses
- Business names
- Transcript selections
- Tax form numbers
- Tax years
- Client information
- Signatures
- Signature dates
- Business signer titles
Name differences can be particularly important.
A borrower who recently married or divorced, for example, may be using a current name that differs from the name appearing on the applicable IRS records. Address differences can create similar problems.
The lender should therefore treat preparation of the 4506-C as an important verification step rather than routine paperwork.
The IRS also specifically requires client information on Line 5d. Missing required client information can result in rejection. For Line 6 transcript requests, entering multiple tax form numbers can also cause the request to be rejected.
How Does a 4506-C Help Detect Mortgage Fraud?
A 4506-C is not simply an administrative IRS form. It is also an important fraud-prevention tool.
Modern document-editing software and artificial intelligence have made financial documents easier to manipulate. Tax returns, W-2s, 1099s, bank statements and other documents can potentially be altered before being presented to a lender.
Government-source verification gives the lender an independent point of comparison.
Consider a borrower who provides a tax return showing substantially more income than was actually reported to the IRS.
A lender relying only on the document supplied by the borrower may not immediately identify the difference.
An IRS transcript can reveal that the IRS record does not correspond with the document in the loan file.
Similarly, Wage and Income information may identify differences between W-2 or 1099 information presented during underwriting and information reported to the IRS.
Again, a discrepancy does not by itself prove fraud. It tells the lender that something needs to be reconciled.
That distinction is critical.
4506-C Versus Form 4506-T
The names of these forms are similar, so they are frequently confused.
Form 4506-C is specifically designed for requests made through the IRS Income Verification Express Service (IVES).
Form 4506-T is the IRS Request for Transcript of Tax Return used through other transcript-request procedures.
For lenders using an IVES participant to obtain transcripts in connection with mortgage lending and other financial transactions, Form 4506-C is the relevant authorization form.
What Happens After the Borrower Signs the 4506-C?
Once the completed authorization has been obtained, the request is submitted through an authorized IVES participant.
The IRS processes the authorization and, when the request is accepted, provides the requested transcript information through the IVES delivery system.
The transcript can then be associated with the lender's loan file and reviewed against the borrower's submitted documentation.
The process sounds simple, but accuracy is essential. A properly prepared request can move directly through the IRS process; an improperly prepared request can be rejected and require correction and resubmission, potentially creating unnecessary delays in underwriting or closing.
The Lender's Perspective: Trust, but Verify
The fundamental purpose of Form 4506-C can be summarized in one phrase:
Independent verification.
Mortgage lenders make decisions involving hundreds of thousands—and sometimes millions—of dollars based in significant part on the borrower's financial information.
The lender should not have to rely exclusively on documents supplied as part of the application.
IRS transcripts give lenders an independent government-source record against which borrower-provided information can be evaluated.
For underwriting, it helps substantiate income.
For quality control, it helps confirm that information relied upon during origination was accurate.
For fraud prevention, it can expose discrepancies that require investigation.
For compliance and loan-file documentation, it creates a stronger and more defensible verification process.
Form 4506-C may occupy only a small portion of a mortgage file, but the information it authorizes can play a major role in determining whether the financial picture presented by a borrower is consistent with the information maintained by the IRS.
For lenders, that makes the 4506-C much more than another form to obtain at closing.
It is one of the tools that turns borrower-provided income into independently verified income.