What is the 70% rule in real estate wholesaling?

The 70% rule states that an investor should pay no more than 70% of a property's After Repair Value (ARV), minus the estimated cost of repairs. The remaining 30% acts as a buffer to cover financing, holding costs, transaction fees, and the buyer's target profit margin.

How does a wholesale fee affect the Maximum Allowable Offer (MAO)?

The wholesale fee is your profit margin. Since the end buyer's purchase price is capped by the 70% rule (ARV x 0.70 - Rehab), your wholesale fee must be subtracted directly from that cap to determine your MAO to the seller. If you want a higher fee, you must negotiate a lower purchase price.

Can I use a higher percentage than 70% for my calculations?

Yes. In highly competitive, high-value markets (where ARVs exceed $500,000), fix-and-flip investors often accept thinner margins, allowing you to use a 75% or 80% rule. Conversely, in low-value markets, you should lower the percentage to 60% or 65% to protect against fixed transaction costs.

What happens if I overestimate the After Repair Value (ARV)?

If you overestimate the ARV, your calculated MAO will be too high. When you present the deal to experienced cash buyers, they will recognize that the property is overpriced relative to its true market potential, and you will struggle to assign the contract.

Mastering the 70% Rule: How to Calculate Maximum Allowable Offer (MAO)

In the high-stakes world of real estate wholesaling, success is not determined by charisma or salesmanship; it is determined by underwriting. Wholesaling is fundamentally a game of mathematical arbitrage. Your objective is to find distressed properties, secure them under contract at a steep discount, and assign that contract to an end buyer (usually a fix-and-flip investor) for a fee.

To survive and thrive in this space, you must master the concept of the Maximum Allowable Offer (MAO). Offering even a few thousand dollars too much can completely destroy your margins and make a contract impossible to assign. Conversely, offering too little might cause you to lose the deal to a competitor.

This guide provides an analytical, step-by-step breakdown of the mathematics behind wholesaling, focusing on the industry-standard 70% Rule, and demonstrates how using an automated Wholesale Calculator can streamline your underwriting workflow.

The Wholesaling Formula: Deciphering the Variables

To calculate the Maximum Allowable Offer, we must model the transaction from the perspective of the end buyer. The fix-and-flip investor who purchases your contract must have enough margin to cover renovation costs, transactional friction, financing costs, and their own target return on investment (ROI).

The foundational formula used to determine the MAO is:

$$\text{MAO} = (\text{ARV} \times \text{Risk Coefficient}) - \text{Rehab Costs} - \text{Wholesale Fee}$$

Let’s break down each variable with mathematical precision.

1. After Repair Value (ARV)

The ARV represents the estimated fair market value of the property after it has been fully renovated to competitive market standards. This is your terminal value. It is calculated using a comparative market analysis (CMA), analyzing recent sales (within 3–6 months) of properties with similar square footage, age, and construction type within a tight geographic radius (typically under 0.5 miles).

2. The Risk Coefficient (The 70% Rule)

In standard market conditions, institutional and experienced retail investors utilize a risk coefficient of 0.70 (70%). This multiplier is designed to automatically carve out a 30% margin. This 30% buffer does not represent pure profit for the flipper; instead, it accounts for:

Financing Costs: Interest payments on hard money loans (typically 10-12% annualized plus points).
Holding Costs: Property taxes, insurance, utilities, and HOA fees accrued during the rehab and listing periods.
Transaction Costs: Buying closing costs, selling closing costs, and real estate agent commissions (typically totaling 8-10% of the final sales price).
Target Profit Margin: The actual net return the investor requires for taking on the project risk (typically 10-15% of the ARV).

3. Estimated Rehab Costs

This is the capital expenditure (CapEx) required to bring the property from its current distressed state to the standard required to achieve the ARV. Underestimating this variable is the most common failure point for novice wholesalers.

4. Desired Wholesale Fee

This is your risk premium—the assignment fee you intend to make for sourcing the deal and coordinating the transaction.

Sensitivity Analysis: When the 70% Rule Fails

While the 70% rule is an excellent baseline, analytical investors must understand its limitations. The 70% coefficient is a variable, not a constant. It must be adjusted based on asset class, price points, and geographic markets.

High-Value Markets (The 80% Rule)

In high-cost-of-living areas (e.g., California, New York, or Seattle) where ARVs routinely exceed $700,000, transaction and holding costs do not scale linearly with property value. A 30% margin on a $1,000,000 home is $300,000. Because this margin is so large, fix-and-flip investors are often willing to accept tighter percentages, sometimes operating on an 80% or 85% rule because their absolute dollar profit remains highly attractive.

Low-Value Markets (The 60% Rule)

Conversely, in lower-income or highly distressed markets where ARVs are under $100,000, a 30% margin is only $30,000. Fixed transaction costs (such as minimum escrow fees, title insurance, and flat-fee utility maintenance) will consume a much larger percentage of this margin. In these environments, investors may require a 60% or even 50% rule to justify the risk.

Practical Example: Step-by-Step Deal Underwriting

Let’s walk through a real-world scenario using concrete numbers to see how these variables interact.

The Subject Property Profile:

Property Type: Single-Family Residence (3-bed, 2-bath)
Current Condition: Heavily dated, minor structural foundation settling, outdated mechanical systems.
Comparable Sales (CMA): Three fully renovated homes within 0.3 miles sold recently for $345,000, $355,000, and $350,000.
Determined ARV: $350,000

Step 1: Quantify Rehab Costs

Your contractor walkthrough yields the following estimated line-item budget:

Foundation repair: $12,000
Cosmetic interior/exterior paint: $6,000
New kitchen (cabinets, countertops, appliances): $15,000
Bathroom remodels (x2): $8,000
HVAC replacement: $6,000
Permits and contingency (10%): $4,700
Total Rehab Cost: $51,700

Step 2: Establish Your Target Wholesale Fee

You decide that for a deal of this complexity, your target assignment fee is $15,000.

Step 3: Apply the Formula

Using the standard 70% rule, we calculate the MAO as follows:

Apply the Risk Coefficient: $$$350,000 \times 0.70 = $245,000$$
Subtract Estimated Rehab Costs: $$$245,000 - $51,700 = $193,300$$
Subtract Your Wholesale Fee: $$$193,300 - $15,000 = $178,300$$

Your Maximum Allowable Offer (MAO) is $178,300.

If you negotiate a purchase price of $178,000 with the seller, you can assign the contract to a flipper for $193,000, securing your $15,000 fee. The flipper will purchase the property for $193,000, spend $51,700 on rehab, and have $105,300 in remaining margin to cover holding, transaction costs, and net profit.

Why Precision Matters: The Danger of Manual Calculations

In competitive real estate markets, speed is a major competitive advantage. However, rushing through manual calculations on a scratchpad or basic smartphone calculator introduces a high probability of human error.

Missing a single line item in your rehab cost estimate or miscalculating the 70% threshold by a mere 5% can result in an overpayment of tens of thousands of dollars. If you lock up a contract at $195,000 when the true MAO was $178,300, you will be unable to assign the deal. You will then be forced to either renegotiate with a frustrated seller—severely damaging your reputation—or walk away from the deal and forfeit your earnest money deposit.

This is why professional wholesalers rely on dedicated digital underwriting tools. Our free Wholesale Calculator is designed to eliminate mathematical errors, allowing you to instantly input ARV, adjust the risk coefficient dynamically, account for precise rehab costs, and calculate your exact MAO in seconds while on the phone with a motivated seller.

Using a standardized calculator ensures that your underwriting remains disciplined, objective, and repeatable—the three hallmarks of any successful real estate enterprise.

Mastering the 70% Rule: How to Calculate Maximum Allowable Offer