How to Calculate Fix and Flip Profit Potential Before You Buy

The Formula Most Investors Use Is Incomplete

The standard shorthand for fix and flip profit looks like this:

Profit = ARV minus Purchase Price minus Rehab Costs

It is a useful starting point. It is not an accurate profit model.

A $280,000 ARV property purchased for $170,000 with $55,000 in rehab appears to generate $55,000 in gross profit. Run the full cost stack and that number collapses to somewhere between $18,000 and $28,000 depending on holding period and financing terms. In some markets, the deal loses money.

The correct model accounts for five cost categories: acquisition costs, financing costs, rehab costs, holding costs, and disposition costs. Every category carries real dollar amounts. None of them are optional.

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The Five Cost Categories You Must Quantify

1. Acquisition Costs

These are costs incurred at purchase, beyond the contract price.

• Hard money origination fees: Typically 2 to 4 points on the loan amount. On a $180,000 loan, that is $3,600 to $7,200 at closing.
• Closing costs: Title insurance, escrow, recording fees, and inspections typically run 1% to 2% of purchase price. Budget $2,000 to $4,000 on a $200,000 acquisition.
• Due diligence: Environmental reports, structural inspections, and permit history searches. Allow $500 to $1,500 depending on property age and condition.

Total acquisition overhead on a $200,000 purchase with a $160,000 hard money loan at 3 points: approximately $9,800.

2. Financing Costs

Hard money rates currently range from 10% to 13% annually. Most fix and flip loans also charge monthly fees of 1% to 1.5% of the outstanding balance.

A $160,000 hard money loan at 12% annual interest held for six months costs $9,600 in interest alone. Add a 1% monthly fee and six months of carrying that loan adds $9,600 plus $9,600 in fees, totaling $19,200. Many investors budget $5,000 for financing and wonder where their margin went.

If the project runs two months over schedule, that same loan costs an additional $3,200. Schedule risk is financing risk.

3. Rehab Costs

Budget with line items, not round numbers. Investors who estimate "around $50,000" for a full gut renovation consistently overspend by 15% to 25%.

Establish a scope of work before closing. Use contractor bids, not guesses. Add a 15% contingency line explicitly. On a $60,000 rehab estimate, that contingency is $9,000. It is not padding. It is the average cost of a mid-project surprise on a 1970s-era home.

4. Holding Costs

Holding costs run every month the property sits in your portfolio.

• Property taxes: Prorate the annual bill across your hold period.
• Utilities: Expect $200 to $500 per month for electric, gas, and water during active rehab.
• Insurance: Vacant property builder's risk policies run $100 to $300 per month depending on coverage and location.
• HOA dues: If applicable, these accrue whether the property is occupied or not.

On a six-month hold, realistic holding costs for a mid-sized property total $3,000 to $5,400.

5. Disposition Costs

Selling the property is expensive. Budget for these costs before you calculate profit.

• Agent commissions: The standard in most markets is 5% to 6% of sale price. On a $285,000 sale, that is $14,250 to $17,100.
• Seller concessions: Buyers regularly request 1% to 3% in closing cost assistance. Budget 1.5% conservatively, or $4,275 on a $285,000 sale.
• Staging and final prep: Professional staging runs $1,500 to $4,000 depending on property size.
• Capital gains taxes: Short-term flips held under 12 months are taxed as ordinary income. At a 32% federal bracket, a $35,000 net gain generates an $11,200 tax liability. Many investors exclude this from their deal analysis entirely.

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Worked Example 1: The Deal That Looks Good

Property: 3-bedroom, 2-bath single-family home, suburban market Purchase Price: $195,000 ARV (based on three comparable sales within 0.3 miles): $295,000 Estimated Rehab: $52,000

Naive profit calculation: $295,000 minus $195,000 minus $52,000 = $48,000 gross profit

Now run the full cost stack:

| Cost Category | Amount | |---|---| | Purchase price | $195,000 | | Acquisition costs (closing, due diligence) | $5,200 | | Hard money origination (3 pts on $155K loan) | $4,650 | | Hard money interest (12%, 7-month hold) | $10,850 | | Rehab costs | $52,000 | | Rehab contingency (15%) | $7,800 | | Holding costs (7 months) | $4,200 | | Agent commission (5.5% of $295K) | $16,225 | | Seller concessions (1.5%) | $4,425 | | Staging and prep | $2,500 | | Total All-In Cost | $302,850 |

Net profit before tax: $295,000 minus $302,850 = negative $7,850

This deal loses money. The naive model said $48,000. The difference is $55,850. Every dollar of that gap is a real cost.

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Worked Example 2: A Deal That Actually Pencils

Property: 4-bedroom, 2.5-bath suburban home Purchase Price: $162,000 ARV: $298,000 Estimated Rehab: $58,000

| Cost Category | Amount | |---|---| | Purchase price | $162,000 | | Acquisition costs | $4,800 | | Hard money origination (3 pts on $130K loan) | $3,900 | | Hard money interest (11.5%, 6-month hold) | $7,475 | | Rehab costs | $58,000 | | Rehab contingency (15%) | $8,700 | | Holding costs (6 months) | $3,600 | | Agent commission (5.5% of $298K) | $16,390 | | Seller concessions (1.5%) | $4,470 | | Staging and prep | $2,200 | | Total All-In Cost | $271,535 |

Net profit before tax: $298,000 minus $271,535 = $26,465

At a 32% short-term capital gains rate, after-tax profit is approximately $17,996.

The naive model would have shown $78,000 gross profit on this deal. The real return is $17,996. That is still a positive outcome, but it is not the same decision.

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The Maximum Allowable Offer Formula

Once you know your full cost stack, work backward to your bid price.

MAO = ARV x 0.70 minus Rehab Costs minus Additional Expenses

The 0.70 multiplier is shorthand for a 30% buffer covering financing, disposition, and holding costs. For markets with higher agent commissions, longer days-on-market, or above-average hard money rates, use 0.65.

For Worked Example 1 above: MAO = $295,000 x 0.70 minus $52,000 minus $15,000 = $139,500

The investor paid $195,000. That is $55,500 above the MAO. The deal was underwater before the rehab started.

The MAO is not a rule. It is a floor. Deals above it require explicit justification, such as a shorter hold period, lower financing costs, or a confirmed ARV supported by recent comparable sales.

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Why ARV Accuracy Determines Everything

Every number in your cost model is knowable. ARV carries uncertainty.

A $15,000 error in ARV projection wipes out most of the profit margin in both worked examples above. Investors who accept a Zestimate or a listing agent's opinion of value without running their own comparable analysis are building a cost model on a faulty foundation.

Pull your own comparables. Use sold data, not list prices. Restrict to properties within 0.25 miles, closed within 90 days, and within 15% of your subject property's square footage. If you cannot find three qualifying sales, the ARV is not established. Adjust accordingly.

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Run Your Numbers Before You Make an Offer

The difference between a profitable flip and a loss is rarely the rehab work. It is the acquisition price. That price is set before the project begins.

The CalcMoney Mortgage Calculator lets you model financing costs across different loan amounts, rates, and hold periods. Input your hard money terms, compare them against conventional bridge financing, and see how each option affects your net return.

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