How to Calculate MAO in Real Estate (Maximum Allowable Offer)

What Is MAO in Real Estate?

MAO stands for Maximum Allowable Offer — the highest price you should pay for an investment property while still achieving your target profit margin after all costs.

Think of it as a ceiling, not a starting point. If a seller wants more than your MAO, the deal doesn't work at that price. Walking away isn't a failure — it's discipline.

The MAO Formula

The standard MAO formula used by experienced investors is:

MAO = (ARV × 70%) − Estimated Repair Costs

Where:

• ARV = After Repair Value (estimated market value after renovations are complete)
• 70% = The standard multiplier (leaves 30% for costs + profit)
• Repair Costs = Your estimated rehab budget

Step-by-Step Example

Let's say you're analyzing a 3-bed, 2-bath single-family home in a market where renovated comparable homes sell for $220,000.

• ARV: $220,000
• Estimated Repairs: $35,000 (flooring, kitchen refresh, paint, HVAC)
• MAO = ($220,000 × 0.70) − $35,000
• MAO = $154,000 − $35,000 = $119,000

If the seller is asking $125,000, you're $6,000 over your MAO. You either need to negotiate down, find a lower rehab estimate, or walk.

What the 30% Buffer Covers

The 30% of ARV that the formula "leaves behind" isn't profit — it covers all your transaction and holding costs, with profit being what's left over:

• Purchase closing costs: 1–2%
• Holding costs (financing, taxes, insurance, utilities): 4–8%
• Selling costs (agent commissions, closing costs): 7–10%
• Unexpected rehab overruns: 5–10%
• Target profit: 10–15%

That adds up to 27–45% depending on your deal specifics — which is why 30% became the standard buffer. It's tight but workable for most markets.

When to Adjust the 70% Multiplier

The 70% figure is a guideline based on typical market conditions. Experienced investors adjust it based on their situation:

Go Lower (60–65%) When:

• You're a beginner with higher risk of cost overruns
• The rehab scope is complex or the property has unknown condition issues
• The market is slowing and days-on-market are increasing
• You're using expensive hard money financing

Go Higher (75–80%) When:

• You're paying cash (no financing costs)
• It's a high-ARV property where 10% profit = a lot of dollars
• The rehab is light cosmetic work with very low uncertainty
• The market is fast-moving with 30–45 day average sale times

The MAO Formula for Wholesalers

If you're wholesaling — buying under contract and assigning to another investor — your MAO needs to leave room for your end buyer's profit and your assignment fee:

Wholesaler MAO = (ARV × 70%) − Repairs − Assignment Fee

Example: ARV $200,000, repairs $30,000, assignment fee $10,000:

MAO = ($200,000 × 0.70) − $30,000 − $10,000 = $100,000

Common MAO Calculation Mistakes

1. Using the Asking Price as ARV

ARV is what the property will sell for after renovation, based on comparable sales — not what the seller is asking for it today. Using the wrong ARV is the single most common and costly mistake in this calculation.

2. Underestimating Repairs

Inexperienced investors consistently underestimate rehab costs, especially for mechanical systems (HVAC, plumbing, electrical). When your repair estimate is too low, your MAO is too high and your margin disappears.

3. Forgetting Holding Costs

A 6-month flip with hard money financing at 12% interest on a $120,000 loan costs roughly $7,200 in interest alone — before taxes, insurance, and utilities. These costs are baked into the 30% buffer, but be realistic about your timeline.

4. Using MAO as Your Opening Offer

MAO is your ceiling. Always start negotiations below it to leave room to move up and still protect your margin.

Using a Calculator Instead of Doing It by Hand

For deals you're seriously analyzing, a purpose-built MAO calculator saves time and catches errors — especially when you want to model multiple scenarios (different ARVs, different repair scopes, different profit targets) side by side.

Our MAO Calculator runs the formula instantly, lets you adjust the multiplier, and shows you exactly how changes in ARV or repair costs affect your max offer. Pair it with our AI Rehab Cost Estimator for photo-based repair estimates when you don't have contractor quotes yet.

Run Your Own Numbers

Enter your deal's ARV, rehab estimate, and multiplier below to get your Maximum Allowable Offer instantly:

Comparing tools for running these numbers at scale? See how DealAnalyzerAI stacks up in our DealCheck alternative comparison and our roundup of the best DealCheck alternatives for investors.

Summary

MAO = (ARV × 70%) − Repairs. Know your ARV accurately, estimate repairs conservatively, and treat MAO as a ceiling not a target. Adjust the multiplier for your market and cost structure. Walk away without guilt when a deal doesn't pencil.

That's the discipline that separates profitable investors from the ones who "learn expensive lessons."