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Official form guide
Form 433-BOIS: 433-B (OIC) (sp)
IRS Form 433-B (OIC) (sp) is used for Income Withholding for Businesses and LLCs classified as a corporation. This form must be completed if the business is an S Corporation or Partnership. The revision date on file is 04/26.
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IRS Form 433-BOIS - 433-B (OIC) (sp)
IRS Form 433-B (OIC) (sp) is used for Income Withholding for Businesses and LLCs classified as a corporation. This form must be completed if the business is an S Corporation or Partnership. The revision date on file is 04/26.
Risk Radar
Scan points- 1Do not use this form if your business has a single owner; use Form 433-A instead.
- 2Filing this form if the business has a single owner (use Form 433-A).
- 3Failing to use Form 433-B (OIC) (sp) exclusively with Form 656, Offer in Compromise.
- 4Not rounding asset values or income/expense amounts to the nearest whole dollar.
- 5Entering negative numbers on any line without noting '0' if the element is negative.
Plain English
This form allows businesses to report their income so that the IRS can collect taxes owed by the company. It provides detailed financial information necessary for the IRS to determine how much of a tax debt must be paid. This form must be used when a business is structured as an S Corporation or Partnership.
Submission Date
- Filing date: 2026-04-23 11:10:42
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when your business is an S Corporation or Partnership (Sociedad anónima o Sociedad colectiva).
- Do not use this form when your business has a sole owner; in that case, complete Form 433-A (OIC).
- Check Form 656 instead when you are presenting a Transaction Offer.
Form selector
Use this form or another form?
Sole Proprietorship
This form is for salaried employees and self-employed workers.
✓ Check before you continue
LLC classified as S Corp
Use this specific version when the LLC meets these criteria.
✓ Check before you continue
Presenting a Transaction Offer
This form must accompany Form 433-B (OIC).
✓ Check before you continue
Deadline or filing window
The filing of Form 433-B (OIC) (sp) is required when using it with Form 656, Offer in Compromise. The source does not state a specific deadline date or day-count for completion, but the offer amount calculation depends on how quickly payment occurs.
Checklist
What you need before filling it out
Section 1: Business Info
Name, EIN, Address details · Form p.1
Sole Owner Rule
Check box or statement on Form p.1 · Form p.1
Asset Valuation Method
Use KBB, NADA, real estate publications, etc. · Form p.2
Total Bank Accounts (Line 1)
Sum of lines (1a) through (1d) on Form p.2 · Form p.2
Digital Asset Value
Must state Equivalent in USD as of today's date · Form p.2
Before you submit
- 1Ensure all required business information (Name, EIN, Address) is filled out on Section 1.
- 2Verify that you have listed all partners, officers, members, and principal shareholders.
- 3Confirm if your business contracts payroll/tax prep services and list the provider's details if 'Yes'.
- 4Review Section 2 to ensure you have gathered recent statements for banks and lenders.
- 5Calculate Total Accounts (Line 1) by summing up lines (1a) through (1d).
- 6For each investment account, calculate the value as: Market Value minus Loan Balance = (2x).
- 7If paying creditors, confirm that Pagarés por Cobrar (Notes Receivable) are listed if 'Yes'.
How to file this form
- 1Complete Section 1 with all required business details and associate personnel information.
- 2Gather current bank statements and loan documents to complete Section 2 regarding Business Assets.
- 3Calculate the total value of cash/investments (Line 1) and investment accounts (Lines 2a-2d).
- 4Determine if you have Notes Receivable or Accounts Receivable, and provide detailed lists if 'Yes'.
- 5Include any necessary supporting documentation using attached pages as needed.
- 6Sign and date the Form 433-B (OIC) (sp) before mailing it to the IRS.
- 7Keep a copy of the completed and signed form for your business records.
Known limitations
- 1This Form 433-B (OIC) (sp) must be completed if a business is an S Corporation or Partnership.
- 2If a business has a sole proprietor, this form should not be used; instead, the filer completes Form 433-A (OIC).
- 3The use of Form 433-B (OIC) (sp) requires that it be submitted along with Form 656, Offer in Compromise.
- 4If a business possesses more properties, vehicles, or equipment than listed on the form, those items must be enumerated in a separate attachment.
Field map
Compact field-by-field guide
General Info
2 items
Full legal name and taxpayer identification number (SSN or EIN).
Current mailing address.
Details
2 items
Complete all applicable sections of this form according to the official IRS instructions.
Enter the relevant dollar amount if this form involves tax calculation.
Certification
1 items
Read and acknowledge any certifications required by this form.
Signatures
1 items
Sign and date. Unsigned forms cannot be processed.
Almost done reviewing the fields?
Fillable formOpen in Editor->The current edition is Revision 4-2026. The source does not point to a separate 'latest information' page, but the revision date indicates the most recent version provided.
What changed or needs a fresh check
- Edition date — confirm it reads 04/26 or the revision date of 4-2026.
- Catalog Number — confirm it is 55735C.
- Form Title — confirm it is Form 433-B (OIC) (sp).
- Business Type — ensure you select S Corporation, Partnership, or LLC correctly.
- Filing Requirement — verify that the business fits one of the listed types to use this form.
Quick Facts
Downloads
After you file
- 1Retain a copy of the completed Form 433-B (OIC) (sp) for records.
- 2Include attachments if additional space is needed to answer any question completely.
- 3The total offer amount listed on this form corresponds to the amount entered in Section 4, Terms of Payment, of Form 656.
- 4Confirm that the business's offer amount is greater than zero ($0).
- 5If a negative number appears on an item line, write "0" on that specific line.
Sources
- SRCForm 433-B (OIC) (sp) Catalog Number is 55735C. | Instructions p.1
- SRCThis form must be completed if a business is an S Corporation or Partnership, or a specific type of LLC. | Instructions p.1
- SRCThe revision date on file is Rev. 4-2026. | Form p.2
- SRCWhen calculating asset value for real estate, the formula is [market value X 0.8 minus the(s) loan balance] (line 4d). | Form p.3
- SRCTotal equipment value is found by summing lines (5a) and (5b), resulting in total (5). | Form p.4
- SRCThe business must report average monthly gross income, calculated from documentation spanning 6 to 12 months. | Form p.4
- SRCThe final Offer amount is the sum of Box A* + Box E or Box F. | Form p.5
- SRCIf a business is currently in bankruptcy, it is not eligible to request an offer. | Form p.5
Common confusion points
Who must file this form?
Businesses that are an S Corporation or Partnership (or certain LLCs) must complete Form 433-B (OIC) (sp).
→ Check the business structure first.
What is the required revision date?
The edition on file is Rev. 4-2026.
→ Confirm this date matches your form.
How do you calculate the value of real estate?
Use [market value X 0.8 minus the(s) loan balance] (line 4d).
→ Ensure all line items are summed correctly to reach total (4).
What is included in 'Other equipment'?
List individual pieces, and if there is more than one piece of equipment, list it on an attachment and note the total in box (5b).
→ Sum lines (5a) and (5b) for the total.
How do you determine business income?
Use the most recent 6 to 12 months of documentation (e.g., invoices, P&L statement) to find average monthly gross income.
→ The sum of boxes (6) through (10) equals Box B (Total of business income).
What if an asset generates income but is not real estate?
You can exclude the owner's equity from that asset when calculating the Offer amount, as shown in Section 2.
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- If the business is currently in bankruptcy, it is not eligible to request an offer using this form.
Questions about IRS Form 433-BOIS
What is IRS Form 433-BOIS used for?
This form allows businesses to report their income so that the IRS can collect taxes owed by the company. It provides detailed financial information necessary for the IRS to determine how much of a tax debt must be paid. This form must be used when a business is structured as an S Corporation or Partnership.
Who must file IRS Form 433-BOIS?
Businesses that are a Corporation (Sociedad anónima), Partnership (Sociedad colectiva), or LLC classified as a corporation must complete Form 433-B (OIC) (sp). If the business has a single owner, this form should not be used; instead, Form 433-A (OIC) should be completed.
What information does IRS Form 433-BOIS require?
The form collects information regarding the total available amounts for the business, details about its assets (like equipment), and summaries of monthly income and expenses. Specific sections include reporting asset values on lines like (5a) and (5b), and summarizing income/expenses in Section 4.
Where do I file IRS Form 433-BOIS?
The form must be used specifically with Form 656, Offer in Compromise. No specific service center address is listed on page 1 for routing instructions.
How do I complete IRS Form 433-BOIS?
First, complete Section 2 by listing asset values (like equipment) using lines (5a) and (5b). Next, summarize monthly income in Section 4 (lines 6-10), then list expenses (lines 11-20). Finally, calculate the minimum offer amount on page 5 before submitting.
What happens if IRS Form 433-BOIS is filed incorrectly?
If the information provided is incorrect or incomplete, it affects how the IRS calculates the minimum offer amount and the final terms of the payment plan.
Who must file this form?
Businesses that are an S Corporation or Partnership (or certain LLCs) must complete Form 433-B (OIC) (sp). Check the business structure first.
What is the required revision date?
The edition on file is Rev. 4-2026. Confirm this date matches your form.
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