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WB-11 Residential Offer to Purchase, page 1
Complex · 69/100Form Complexity Index

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What this form asks for

The AI fills all of it, from your answers or your documents.

Form WB-11, the Residential Offer to Purchase, is a state-approved contract used throughout Wisconsin for buying and selling residential real estate. It outlines all terms and conditions of the proposed transaction, including purchase price, contingencies, deadlines, and property details, becoming a legally binding agreement upon acceptance by both buyer and seller. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
Fillable fields161
Pages11
Sections12
Questions that depend on earlier answers8
Form Complexity IndexComplex, 69/100

The AI checks your answers before you download

14 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Purchase Price Numeric and Written Consistency

This check ensures that the purchase price entered in numeric format (e.g., '$500,000') on line 9 is identical to the amount written out in words (e.g., 'Five Hundred Thousand Dollars') on lines 8-9. This is critical for preventing ambiguity and legal disputes over the agreed-upon price. If the values do not match, the submission should be flagged for manual review and correction to ensure the contract reflects the true intent of the parties.

Binding Acceptance Deadline Chronology

Validates that the 'Binding Acceptance' deadline on line 39 is a future date and occurs after the offer's draft date on line 1. A deadline that has already passed is invalid and makes the offer immediately voidable. This check prevents the creation of contracts with impossible or illogical deadlines, ensuring the seller has a valid timeframe to consider the offer.

Closing Date Sequence Validation

Verifies that the 'Closing' date on line 47 is set for a date after the 'Binding Acceptance' deadline on line 39. A closing cannot be scheduled before the offer is officially accepted and becomes a binding contract. This validation maintains the logical sequence of events in the real estate transaction and prevents scheduling conflicts and contractual impossibilities.

Buyer Name Completeness

Ensures that the Buyer's full legal name is provided on line 2. As a legally binding contract, the offer must clearly identify all parties involved. Failure to provide a buyer's name makes the offer incomplete and unenforceable, so this field must not be left blank.

Property Address Completeness

This check confirms that the full property address, including Street Address (line 3), Municipality (line 5), and County (line 6), is completely filled out. The property is the subject of the contract, and an incomplete or missing address creates fatal ambiguity. A failed validation requires the user to provide the full address to ensure the correct property is being offered upon.

Financing Contingency Completeness

If the 'Financing Commitment Contingency' checkbox on line 248 is marked, this validation ensures that all related financial details are provided, including loan amount, term, and amortization years (lines 250-251). Leaving these terms blank would make the contingency vague and potentially unenforceable. This check guarantees that the conditions under which the buyer must secure financing are clearly defined.

And 8 more checks
  • Loan Amount vs. Purchase Price Logic
  • Exclusive 'Strike One' Selection
  • Earnest Money Option Exclusivity
  • Contingency Deadline Validity
  • Tax Proration Formula Selection
  • Seller Acceptance Date Compliance
  • Closing of Buyer's Property Contingency Details
  • Agent Role Selection

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How to Fill Out WB-11 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select the WB-11 Residential Offer to Purchase form.
  2. Use the AI assistant to input the buyer's and seller's information, along with the complete property address and legal description.
  3. Enter the financial details of the offer, including the purchase price, earnest money amount, and financing terms.
  4. Specify all applicable contingencies, such as inspection, appraisal, and financing, and set the deadlines for each.
  5. Detail what items are included or excluded from the sale, define the closing date, and add any special provisions or addenda.
  6. Review all the information populated by the AI for accuracy, make any necessary corrections, and then have the buyer(s) electronically sign the document.
  7. Securely download, print, or share the completed and signed offer for delivery to the seller or their agent.

Common Mistakes in Completing WB-11

The ones the AI is built to catch.

Purchase Price Discrepancy
This error occurs when the purchase price written in words (lines 8-9) does not match the numeric value in the parentheses. This often happens due to a simple typo or last-minute change that isn't updated in both places. A discrepancy creates ambiguity and can lead to legal disputes over the true contract price, potentially voiding the offer or requiring an amendment to clarify, which delays the process.
Vague Descriptions of Included or Excluded Items
Buyers or sellers often provide generic descriptions like 'appliances' or 'drapes' in the 'Included' (lines 12-16) or 'Not Included' (lines 20-23) sections. This ambiguity leads to disputes at the final walk-through when the specific high-end refrigerator has been swapped for a different one. To avoid this, list items with specific details like brand, model, and color, ensuring there is no confusion about what stays and what goes.
Ignoring 'Strike One' Options on Contingencies
The form contains several 'STRIKE ONE' clauses, such as the Seller's 'Right to Cure' for inspections (line 216) and appraisals (line 315). Parties often overlook these, and the contract defaults to a specific outcome (e.g., Seller 'shall' have the right to cure). This can unintentionally lock a buyer into a situation they wished to avoid, such as allowing the seller to perform repairs instead of being able to terminate the offer.
Incomplete or Unrealistic Financing Contingency Terms
Buyers may leave blanks or enter vague terms in the Financing Commitment Contingency section (lines 248-255), such as the loan amount, term, or maximum interest rate. This can render the contingency unenforceable, putting the buyer's earnest money at risk if they cannot secure a loan. It is crucial to fill in specific, realistic figures to create a valid contingency that protects the buyer.
Improper Handling of Contingency Notices
A common mistake is misunderstanding the strict procedure for delivering a Notice of Defects (line 207). A buyer might send an amendment proposing repairs instead of the required formal notice, believing this satisfies the contingency deadline. This fails to meet the contract's requirements, causing the contingency to be deemed satisfied and forcing the buyer to accept the property with its defects or risk default.
Failing to Specify the Tax Proration Method
On lines 365-371, parties often neglect to check a box for how real estate taxes will be prorated, causing it to default to the previous year's net taxes. In cases of new construction, recent reassessments, or rising mill rates, this can result in a significant financial surprise for the buyer after closing when the actual tax bill arrives. Selecting the appropriate method or agreeing to re-prorate post-closing (line 377) prevents these disputes.
Incomplete or Inaccurate Property Description
An offer may be written with an incomplete or incorrect street address, or it may omit the municipality and county (lines 3-7). While a street address is common, a full legal description is what defines the property being transferred. Errors or omissions can cause significant delays with title insurance, financing, and recording the deed, potentially jeopardizing the entire transaction.
Misunderstanding 'Time is of the Essence'
Parties often fail to properly manage the 'Time is of the Essence' clause (lines 88-93) by either striking or not striking applicable deadlines. If a deadline is 'of the essence,' missing it by even a minute constitutes a breach of contract. If it is not, performance within a 'reasonable time' is allowed. This misunderstanding can lead to a party unintentionally defaulting on the contract or losing the right to enforce a strict deadline.
Poorly Drafted 'Additional Provisions'
The 'Additional Provisions/Contingencies' section (lines 548-570) is frequently used to add custom terms, but these are often written in a way that is ambiguous, contradictory to other parts of the offer, or legally unenforceable. This creates significant risk and is a common source of litigation when parties disagree on the interpretation of the poorly drafted clause. It is always best to use state-approved forms or have an attorney draft any custom language.
Incorrect or Missing Delivery Information
Failing to provide a complete and correct email, fax, or mailing address in the 'Delivery of Documents' section (lines 571-589) is a critical oversight. All official notices, such as a Notice of Defects or a bump clause activation, are sent to these contacts. An incorrect address can mean a party never receives a time-sensitive notice, causing them to miss a deadline and lose contractual rights or even default on the offer.

Frequently Asked Questions About WB-11

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 13 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your WB-11.
Can I fill other forms too?
This plan is for your WB-11: your own AI agent fills it as often as 5 times a month. To fill other forms and upload your own, choose a Professional plan from your account.
How do I cancel?
From your account, in two clicks, any time. No email, no call.
How does the AI fill out WB-11?
You answer a few questions in plain words, or upload a document you already have. The AI reads what you give it and puts each answer into the right field of WB-11, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is WB-11 to fill out?
WB-11 has a Form Complexity Index of 69 out of 100, in the complex tier: 161 fillable fields across 11 pages. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is the WB-11 Residential Offer to Purchase form?
This is a legally binding contract used in Wisconsin for a buyer to make an offer to purchase a residential property. When signed by both the buyer and seller, it outlines all the terms and conditions of the sale.
Who is responsible for filling out this offer?
The buyer, typically with the assistance of their real estate agent, fills out this form to present their offer to the seller. The seller then reviews it and can accept, reject, or counter the offer.
What is the difference between a 'Fixture' and personal property?
Fixtures are items physically attached to the property, like light fixtures or built-in appliances, and are automatically included in the sale unless specifically excluded on lines 20-23. Personal property, like furniture, is not included unless you list it in the 'Included in Purchase Price' section.
What happens to my earnest money if the deal falls through?
If the offer is not accepted or if the deal is terminated per a contingency, the earnest money is typically returned to the person who paid it. If the offer doesn't close for other reasons, disbursement is determined by a written agreement or legal proceedings.
When does this offer become a legally binding contract?
The offer becomes a binding contract only when a copy of the offer, signed by all parties, is delivered to the buyer by the deadline specified on line 39. Until that delivery occurs, the buyer may withdraw the offer.
What is an Inspection Contingency?
This contingency allows the buyer to have the property inspected by a professional. If the inspection reveals 'Defects' the buyer objects to, they can provide a 'Notice of Defects' to the seller, which may lead to repairs, price negotiations, or the termination of the offer.
What does it mean if the seller has the 'Right to Cure' defects?
If the seller has the 'Right to Cure,' they can choose to repair the defects you identified in your Notice of Defects. If they elect to cure and complete the repairs as agreed, the offer remains valid; otherwise, the offer may become null and void.
What happens when I deliver my loan commitment to the seller?
Delivering your signed loan commitment to the seller satisfies the financing contingency and removes it from the offer. This shifts the risk to you, the buyer, if the loan ultimately does not get funded for any reason.
What if the property appraises for less than the purchase price?
If the appraisal is low, you must provide the seller with the appraisal report and a written notice objecting to the value. Depending on the terms, the seller may have the right to lower the price, or the offer could become null and void.
Do I have to receive a Real Estate Condition Report?
In most cases for properties with one-to-four dwelling units, Wisconsin law requires the seller to provide you with a Real Estate Condition Report. If you don't receive it within 10 days of acceptance, you may have the right to rescind the contract.
What does 'Time is of the Essence' mean for deadlines in this contract?
When 'Time is of the Essence' applies to a date, failure to perform by that exact deadline is a breach of contract. If it does not apply, performance within a reasonable time of the deadline is allowed before a breach occurs.
Can AI help me fill out this form?
Yes, AI-powered services like Instafill.ai can help you accurately auto-fill form fields, which saves time and reduces the chance of errors. However, you should always review the completed form with your real estate agent or attorney.
How can I use Instafill.ai to complete this form online?
Simply upload the WB-11 form to Instafill.ai, and its AI will identify the fields. You can then enter your information once, and the tool will populate it across all relevant sections, making the process faster and more efficient.
The PDF of the offer I received isn't fillable. What can I do?
You can use a service like Instafill.ai, which can convert flat, non-fillable PDFs into interactive, fillable forms. This allows you to easily type your information directly into the document online without needing to print and write by hand.
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