A MAO calculator is a simple tool that tells you the most you can pay for a property and still walk away with a profit. MAO stands for Maximum Allowable Offer.
You plug in a few numbers: the value after repairs, your fix-up budget, your costs, and your target profit. The calculator returns a ceiling. Offer above it and you’re betting on luck. Offer at or below it and the math works.
Real estate investors use a MAO calculator on every deal to set a maximum purchase price before they make an offer. This guide breaks down the MAO formula, walks through the calculation step by step, and shows real deals so you can run the numbers on your next investment property.
What Is the Maximum Allowable Offer (MAO) Formula?
The Maximum Allowable Offer is the highest price you can pay for a property and still hit your profit goal. The base formula is short:
MAO = After Repair Value − Repair Costs − Fixed Costs − Desired Profit
Every number in that formula does a job. Get one badly wrong and your offer is either too high to profit or too low to win. Here’s what each piece means.
- After Repair Value (ARV): What the property will be worth once it’s fully fixed and move-in ready. You pull this from recent sales of similar homes nearby, the same way you’d price a used car.
- Repair costs: Everything it takes to bring the house to that after-repair condition. Roof, HVAC, kitchen, paint, the works.
- Fixed costs: The non-repair expenses of doing the deal. Closing costs, holding costs, and for wholesalers, your assignment fee.
- Desired profit: The minimum spread you want for taking on the risk and the work. No profit target, no deal.
Here’s a quick example. Say a house will be worth $300,000 fixed up. It needs $50,000 in repairs. You budget $20,000 for closing and holding, and you want $40,000 in profit.
MAO = $300,000 − $50,000 − $20,000 − $40,000 = $190,000
So $190,000 is your ceiling on this deal. Pay more and you’re cutting into the profit you set out to make.
The 70% Rule Formula
The 70% rule is a shortcut version of the MAO formula. It says:
MAO = (ARV × 0.70) − Repair Costs
The 0.70 bakes in a 30% cushion that’s meant to cover your fixed costs and your profit in one move. So instead of itemizing closing, holding, and profit separately, you let the 30% do the work.
Run the same house through it:
MAO = ($300,000 × 0.70) − $50,000 = $160,000
Lower the percentage to be more conservative, raise it to be more aggressive. The rule exists to keep you from overpaying into a deal that never pays.
The Detailed Cost Breakdown Formula
When you want more precision than the 70% rule gives, you break the costs out one by one. A common wholesaler version looks like this:
MAO = (ARV × 0.70) − Repair Costs − Assignment Fee
Here are the cost factors that move your number.
- After Repair Value (ARV): The anchor for the whole calculation. Every other number is measured against it, so a shaky ARV throws off everything downstream.
- Repair costs: Your rehab budget. Underestimate here and your real offer ceiling drops below what you actually paid.
- Assignment fee (wholesalers): The spread you charge to pass the contract to an end buyer. Subtract it so the deal still pencils for them.
- Closing costs: Title, escrow, and transfer taxes on both the buy and the sell. Small per line, real in total.
- Holding costs: What you pay to own the property until you exit. Taxes, insurance, utilities, and loan interest.
How to Calculate MAO Step by Step
Calculating MAO is a seven-step sequence: estimate the ARV, apply the 70% rule, estimate repairs, subtract closing costs, subtract holding costs, subtract your profit, and read off the final number. Here’s how each step works.
Step 1: Estimate the After Repair Value (ARV)
Start with the ARV, the price the home will fetch once it’s fully renovated. You estimate it from comparables: similar homes nearby that sold recently in finished condition. Pull three to five close matches and see what they closed for. This number anchors everything else, so accuracy matters most here.
Step 2: Apply the 70% Discount Rate
Multiply the ARV by 0.70. That gives you the total pool of money available for repairs, costs, and profit combined. The 30% you set aside is your safety margin against surprises. Treat 0.70 as a starting point, not gospel. Hot markets push it higher, slow markets pull it lower.
Step 3: Estimate Repair and Rehab Costs
Figure out what it costs to get the property to that after-repair condition. Walk the house, price the big systems first (roof, HVAC, foundation), then finishes. Contractor bids beat guesses, and a per-square-foot cost guide works for a fast estimate. Lowball this number and you’ll overpay without realizing it.
Step 4: Subtract Closing and Transaction Costs
Pull out the fees tied to buying and selling: title insurance, escrow, transfer taxes, and recording fees. These vary by state and county, so use local rates rather than a national average. They’re easy to forget, and they quietly eat your spread if you leave them out.
Step 5: Subtract Holding Costs
Subtract what it costs to own the property until you sell. That’s property taxes, insurance, utilities, and loan interest, multiplied by how many months you expect to hold. A flip that drags from four months to eight can double this line, so be honest about your timeline.
Step 6: Subtract Your Desired Profit Margin
Take out the profit you need to make the deal worth doing. Set it from your goals and your risk tolerance, not wishful thinking. A thin margin on a heavy rehab is how investors lose money. Decide your minimum before you run the number, then hold the line.
Step 7: Arrive at Your Final MAO
What’s left is your MAO, the most you should offer. Treat it as a ceiling and your opening position, not a fixed price. Factor in property-specific risk, market conditions, and professional advice before you commit. The calculator gets you a smart number fast. Your judgment closes the gap.
Real-World MAO Calculation Examples
The fastest way to trust the formula is to watch it run on real numbers. Below are three scenarios: a fix and flip, a wholesale deal, and the same property in a hot market versus a slow one. Watch how each input swings the final offer.
Fix and Flip Example
Here’s a fix and flip run through the MAO formula start to finish. Comps say the house is worth $250,000 renovated. You budget $45,000 for rehab, $18,000 for closing and selling, $9,000 for six months of holding, and a $40,000 profit.
MAO = $250,000 − $45,000 − $18,000 − $9,000 − $40,000 = $138,000
As a fast cross-check, run the 70% rule:
MAO = ($250,000 × 0.70) − $45,000 = $130,000
That lands close to the detailed number, which is a good sign.
Tip: run both the 70% shortcut and the full breakdown on every deal. If they land far apart, your fixed-cost or profit assumptions need a second look.
Wholesale Deal Example
A wholesale deal works the same way, with one extra subtraction: your assignment fee. You’re not fixing anything, you’re locking up a contract and selling it to an end buyer. The offer has to leave room for their profit and yours.
The core inputs are ARV, the buyer’s repair costs, closing costs, the holding period, and soft costs.
The standard 70% version for wholesale is:
MAO = (ARV × 0.70) − Rehab Costs − Closing Costs
Then subtract your assignment fee on top. Say a property has an ARV of $200,000, needs $40,000 in rehab, and you want a $15,000 fee.
MAO = ($200,000 × 0.70) − $40,000 − $15,000 = $85,000
That’s $140,000 after the 70% step, minus the $40,000 rehab and your $15,000 fee.
Some investors prefer a looser version that builds in a rehab contingency and treats soft costs as a percentage of ARV:
MAO = (ARV × 0.75) − (Rehab + (Rehab × contingency)) − (ARV × soft cost %)
If you don’t want to itemize, a quick proxy is to estimate soft costs (closing plus holding) at 10% to 15% of ARV and subtract that.
Competitive Market vs. Slow Market Comparison
MAO calculations shift between a competitive market and a slow one, because the percentage you apply to ARV isn’t fixed. In a hot market you stretch higher to beat other buyers. In a slow market you pull back to protect yourself.
In a hot market, investors often run 75% to 80% of ARV to stay in the running. In a slow market, many drop to 65% or lower to leave more cushion. Same house, very different offer.
| Competitive Market | Slow Market | |
| ARV percentage | 75% to 80% | 65% or lower |
| ARV | $250,000 | $250,000 |
| Applied percentage | 78% | 65% |
| Less rehab | −$45,000 | −$45,000 |
| Maximum offer | $150,000 | $117,500 |
What Factors Affect Your Maximum Allowable Offer (MAO)?
Your Maximum Allowable Offer is shaped by your ARV, repair costs, closing costs, holding period, desired profit, and the state of the market. The 70% rule is a handy default, but these factors are why it bends.
Inspections, lender and financing fees, property taxes, insurance, your exit strategy, the property type, and your risk tolerance all push the number up or down too.
ARV Accuracy
ARV accuracy is the foundation of a usable MAO, so a bad estimate distorts everything. Lean on recent comparable sales and, on bigger deals, a professional appraisal. Overstate the ARV and your offers look generous but lose money. Understate it and you’ll sit on the sidelines while you miss deals.
Repair Cost Estimates
Repair cost estimates are the other number you can’t fumble. Use contractor bids and inspection reports, then add a contingency buffer of 10% to 20% for surprises behind the walls. Underestimate the rehab and your MAO climbs higher than it should.
Buying, Selling, and Closing Costs
Buying, selling, and closing costs come straight out of your spread. Title fees, agent commissions, transfer taxes, and legal fees add up fast across both ends of the deal. Skip them in the math and you’ll overstate your MAO, then watch your profit shrink at the closing table.
Holding and Financing Costs
Holding and financing costs pile up the longer you own the property. Property taxes, insurance, utilities, maintenance, lender fees, and loan interest all run during the project. Estimate your holding period honestly and fold every financing charge into the calculation so the MAO reflects the true carry.
Profit Margin Target
Your profit margin target sets the floor under the whole deal. You subtract it after costs to land on the MAO, so it caps your offer. Set it realistically for the work and the risk. Chase deals with too thin a margin and one surprise wipes you out.
Market Conditions and Local Demand
Market conditions and local demand shift the percentage you can offer. A hot market with low inventory may force a higher percentage of ARV to win the deal. A slow market lets you offer less. Research local demand and competition, then adjust your number to match.
Mistakes, Pitfalls, and Limitations of Maximum Allowable Offer Calculators
MAO calculators are useful, but only as good as your inputs and how you read the output. Most problems fall into three buckets: user mistakes like bad inputs and blind trust, formula limits like the 70% rule not fitting every deal, and outside factors the tool can’t see.
User Errors
The most common MAO mistakes come from the person at the keyboard, not the tool. Underestimating repairs, overestimating ARV, and trusting the output without a sanity check are the big three. Each one quietly pushes your offer in the wrong direction and shows up later as lost profit.
Overestimating ARV
Overestimating ARV inflates your MAO and leads to offers that can’t profit. It usually comes from cherry-picked comps or rosy assumptions about where the market is heading. Stick to recent, genuinely comparable sales and price the property as it will actually appraise, not as you hope it sells.
Underestimating Rehab Costs
Underestimating rehab is the flip side, and it’s just as costly. Miss real repair expenses and your MAO comes out too high, eating the profit you thought you had. Add a 10% to 20% contingency to every rehab estimate, and back it with thorough inspections and detailed contractor bids.
Ignoring Holding and Financing Costs
Ignoring holding and financing costs quietly overvalues your offer. Property taxes, insurance, utilities, and loan interest run the entire time you own the property. Add them all into the MAO so the number reflects what the deal really costs you, not just the purchase price and the repairs.
Applying the 70% Rule Rigidly in All Markets
Applying the 70% rule the same way everywhere is a classic trap. It’s a baseline, not a law, and local conditions break it. A hot market may justify 75% or higher; a slow one, 65% or less. Adjust for the market, property type, and your risk tolerance.
Inherent Tool Limitations
Even used perfectly, an MAO calculator has built-in limits. First, its accuracy depends on your input quality: ARV, rehab, closing, and holding. Second, a generalized rule like the 70% rule can miss a market’s specifics or your own goals. Don’t ask the tool to do more than it can.
ARV Estimates Can Be Off
ARV estimates are educated guesses, and when they’re off, the MAO is off with them. Overstate the value and you overpay. Understate it and you lose the deal. Base your number on recent comparable sales and real market data, and treat valuation as a range, not a precise figure.
Doesn’t Account for Unexpected Costs
A calculator can’t see the surprises a project throws at you. Hidden repairs, a sudden market shift, or a new regulation can all hit your bottom line after you’ve run the math. Build a contingency buffer into your numbers so one surprise doesn’t turn a winner into a loser.
Not a Replacement for Full Due Diligence
An MAO calculator gives you a fast estimate, not a green light. You still need inspections, a title search, and real market research before you commit. Skip the due diligence and you trade a few minutes of work for the risk of a very expensive mistake.
How to Choose or Build a Maximum Allowable Offer Calculator
An MAO calculator is any tool that runs the offer math for you, from a spreadsheet to full software. Whatever you pick, it needs the core inputs: ARV, repair costs, holding costs, closing costs, desired profit, and a wholesaler’s assignment fee. Accuracy in those fields beats a slick interface.
| Calculator type | Best for | Strength | Trade-off |
| Free spreadsheet | Getting started | Free, fully customizable | Manual entry, error-prone |
| Online calculator | Quick one-off checks | Fast, no setup | Limited customization |
| Integrated software | Active, high-volume investors | Pulls real data, one workflow | Cost, learning curve |
Free Spreadsheet Templates
Free spreadsheet templates are the cheapest way to run MAO math. They give you input fields for ARV, repairs, holding, and profit, and you can edit the formulas. The trade-off is manual data entry and the user error that comes with it. They’re a solid place to start.
Online MAO Calculators
Online MAO calculators are web tools that automate the math. You get a clean interface, instant results, and built-in formulas, with nothing to set up. The downside is limited customization. You’re often stuck with the default percentage and can’t change the formula to fit your market or strategy.
Real Estate Software with MAO Built In
Some real estate platforms bake the MAO calculation right into the deal workflow. The win is integration: property data, comps, and your offer math live in one place, so the calculator pulls from real lead data instead of fields you retype.
For example, a CRM like REsimpli includes a built-in deal calculator on each lead that runs ARV and the 70% rule against auto-pulled property data. The trade-offs are cost and a learning curve.
What to Look for in a Good Calculator
A good MAO calculator earns its keep with a few features. Look for customizable input fields, transparent formulas you can actually see, the ability to adjust the percentage for local market conditions, and clear documentation or support. If you can’t tell how it reached the number, don’t trust the number.
How to Get More Accurate Maximum Allowable Offer Results
Accurate MAO results come down to accurate inputs and a little discipline. The fixes are simple: pad your rehab estimate, use conservative comps, keep your data fresh, match your percentage to the market, and rerun the number when conditions change.
Add a 10-15% Contingency to Rehab Estimates
Add a 10% to 15% contingency to every rehab estimate. Older houses hide problems, and that buffer absorbs the surprise repairs that show up once demo starts. It keeps your MAO honest and protects your profit margin from the costs you couldn’t spot on the walk-through.
Use Conservative (Lower-End) ARV Comps
Lean toward the lower end of your comparable sales when setting ARV. Conservative comps keep you from overestimating value and making an offer that can’t profit. If the comps range from $240,000 to $270,000, pricing closer to $245,000 builds a margin of safety into the deal.
Verify Comps Within a 3-6 Month Window
Use comps that sold in the last three to six months. Older sales don’t reflect current conditions, and a stale ARV will steer your MAO wrong in a moving market. Recent, nearby, and similar are the three filters that keep your value estimate grounded in what buyers are paying now.
Adjust the Percentage for Your Market and Strategy
Match the percentage to your market and your exit. A hot market may justify 75% or more of ARV, a balanced one sits near 70%, and a slow one calls for 65% or less. Strategy matters too. Wholesaling, flipping, and buy-and-hold each tolerate a different number.
Reassess MAO If Market Conditions Shift
Rerun your MAO when the market moves. Rising ARVs, climbing repair costs, or cooling buyer demand all change what a deal can bear. An offer that made sense two months ago can be wrong today. Reassessing regularly keeps you from overpaying in a downturn or missing deals in a run-up.
How to Manage Your Deals After Setting Your MAO
Setting the MAO is the start, not the finish. Once you have a number, the work is staying organized: tracking every lead and offer, following up, watching your KPIs, signing fast, and keeping your outreach in one place. Sloppy deal management loses deals a good MAO would have won.
Track Every Lead and Offer in a CRM
Keep every lead and offer in a CRM instead of a notebook or your memory. A CRM organizes contacts, tracks where each offer stands, and stops deals from slipping through the cracks. Software built for investors runs a full lead pipeline, so you always know which deals are live.
Automate Follow-Ups with Sellers
Automate your seller follow-up so leads don’t go cold while you’re busy. Scheduled texts, emails, and reminders keep you in front of motivated sellers, and consistent follow-up turns a maybe into a contract. A good investor CRM runs automated drip sequences that fire on a schedule or a trigger.
Monitor Deal KPIs to Stay on Budget
Watch your numbers after the offer, not just before it. Keep an eye on your repair budget versus actual spend, holding costs, and margin so a deal doesn’t drift. An investor CRM puts your performance KPIs and marketing ROI in one dashboard, which makes that habit easier to keep.
Use E-Signatures to Close Faster
Use e-signatures to move from agreement to signed contract fast. Digital signing skips printing, scanning, and mailing, so you lock up a deal before a competitor does. A CRM like REsimpli sends contracts by e-sign with no fee to send, so paperwork won’t slow a hot lead.
Run Skip Tracing and Outreach from One Place
Run skip tracing and outreach from a single platform instead of juggling tools. One place to find owner contact info and reach out by call, text, or mail saves time and keeps data clean. An all-in-one CRM like REsimpli handles skip tracing and multichannel outreach together.
A good MAO keeps you from overpaying. Good systems keep you from losing the deals your MAO qualifies. If you want the offer math, the pipeline, the follow-up, and the outreach in one place, a platform built for investors like REsimpli brings them together.
Get started with REsimpli and run your next deal with the numbers and the workflow on your side.
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