Fix and Flip Profit Margins: How to Calculate Your Spread Before Making an Offer
Key Takeaways:
- The spread is your profit: ARV − Purchase Price − Repair Costs − Holding/Selling Costs = Net Profit
- The 70% rule is a starting point, not a complete analysis — it ignores holding costs, financing, and selling expenses
- Hot markets offer thinner margins but faster turns; slow markets offer wider margins but more carrying risk
- Knowing what investors actually pay per square foot in your market eliminates guesswork on purchase price
- Wholesalers must ensure the end buyer's margin is attractive enough to close — your fee comes from the gap
Every fix and flip deal has a spread — the gap between what you pay for a property and what it sells for after renovation, minus all the costs in between. That spread is your profit. If you don't calculate it accurately before making an offer, you're gambling, not investing.
This guide breaks down exactly how to calculate your flip spread, what typical margins look like across different markets, and how to use real investor purchase data to make offers with confidence instead of guesswork.
What Is the Spread?
The spread is the difference between your total revenue (the sale price after renovation) and your total costs (purchase price, repairs, holding costs, and selling costs). It's the single number that tells you whether a deal is worth pursuing.
The Spread Formula
Net Profit = ARV − Purchase Price − Repair Costs − Holding Costs − Selling Costs
Every dollar you miss in costs comes directly out of your profit
Most new investors focus only on the top-line numbers: ARV minus purchase price minus repairs. But holding costs (insurance, property taxes, utilities, loan payments during rehab) and selling costs (agent commissions, closing costs, transfer taxes) can easily eat 10–15% of the ARV. A deal that looks like a $40,000 profit on the surface can shrink to $15,000 once you account for all costs — or even turn negative if the rehab runs long.
Example Spread Breakdown
In this example, the gross spread (ARV minus purchase minus repairs) looks like $60,000. But after holding and selling costs, the actual profit drops to $32,000. Failing to account for those costs would lead you to overpay by nearly $28,000 — which on a thinner deal could wipe out your profit entirely.
The 70% Rule and Why It's Just a Starting Point
The 70% rule is the most widely cited formula in fix-and-flip investing. It states that your maximum purchase price should be no more than 70% of the ARV, minus repair costs. The remaining 30% is designed to cover holding costs, selling costs, and your profit.
The 70% Rule
Max Purchase = ARV × 70% − Repair Costs
Example: $250K ARV × 70% = $175K − $40K repairs = $135K max purchase
The problem with the 70% rule is that it treats all deals the same. It doesn't account for your actual financing costs, local tax rates, insurance premiums, or whether you're paying agent commissions or selling FSBO. A deal in a high-tax state with hard money financing at 12% interest has very different holding costs than a cash purchase in a low-tax state.
Use the 70% rule as a quick filter to decide if a deal is worth deeper analysis. If a property doesn't pass the 70% rule, it almost certainly won't work with a full cost breakdown. But if it does pass, run the full spread calculation with your actual costs before making an offer. Some deals that pass at 70% still fail once you layer in real expenses, and some deals that fail at 70% work at 75% because your costs are lower than average.
When to Adjust the Percentage:
In competitive markets where inventory is scarce, experienced flippers may go to 75–80% because they can turn properties faster (lower holding costs). In slower markets or riskier deals, drop to 60–65% for extra margin. The percentage should reflect your actual cost structure and risk tolerance, not a one-size-fits-all rule.
Typical Fix and Flip Margins by Market
Profit margins vary significantly by market type. Understanding these patterns helps you set realistic expectations and avoid chasing deals that don't pencil in your specific market.
Hot Markets (High Demand, Low Inventory)
Think Austin, Phoenix, Nashville, or any metro with rapid population growth. In these markets, properties sell quickly — often within 30–60 days of listing — which reduces holding costs. But competition for distressed properties is fierce, pushing purchase prices higher and squeezing margins.
Typical net margins in hot markets range from 10–15% of ARV. The trade-off is speed: lower margin per deal but faster capital recycling means you can do more flips per year. An investor making 12% on four flips per year outearns one making 20% on two.
Moderate Markets (Balanced Supply and Demand)
These are markets with steady buyer demand and reasonable inventory. Properties take 60–120 days to sell, and purchase prices for distressed properties tend to be more negotiable than in hot markets.
Typical net margins range from 15–20% of ARV. This is the sweet spot for most flippers — enough margin to absorb surprises while still turning capital at a reasonable pace. Most experienced flippers target these markets for consistent, repeatable returns.
Slow Markets (High Inventory, Lower Demand)
Markets with extended days on market (120+ days), declining populations, or economic headwinds. Purchase prices are lower relative to ARV, but the risk of extended holding periods is real. A property that sits on the market for six months after renovation eats into profits through ongoing mortgage payments, insurance, taxes, and utilities.
Margins on paper may look attractive at 20–25%+ of ARV, but the actual realized profit depends entirely on how long the property takes to sell. Extended holding periods also tie up your capital, preventing you from moving to the next deal.
Key Insight:
Don't chase the highest margin per deal. Chase the highest margin per unit of time. A 12% margin flip that closes in 3 months generates more annualized return than a 22% margin flip that takes 9 months. Always factor in time when comparing opportunities.
Why Knowing Investor $/Sqft Changes Everything
Most spread calculations start with a guessed purchase price. You look at a distressed property, estimate what you might offer, and work backwards from there. The problem is that without knowing what other investors are actually paying in that market, your purchase price assumption is just a guess — and the entire spread calculation falls apart if the guess is wrong.
Investor purchase data solves this. When you can see that investors in a specific zip code are buying distressed properties at $85–$95 per square foot, while renovated homes sell at $150–$165 per square foot, you immediately know the spread opportunity. For a 1,500 sqft property, that's a purchase price around $135,000 and an ARV around $240,000 — a $105,000 gross spread before costs.
This data also tells you whether a market is attractive for flipping. If investors are paying $130/sqft and renovated homes sell at $145/sqft, the spread is only $15/sqft — likely not enough margin after costs. But if the gap is $50–$70/sqft, there's real profit potential. This per-square-foot lens cuts through the noise and lets you compare opportunities across different price points and property sizes.
$/Sqft Spread Analysis Example
How Wholesalers Use Spread to Set Assignment Fees
As a wholesaler, you don't capture the full spread — your end buyer (the flipper) needs enough margin to justify the rehab risk. Your assignment fee comes from the gap between what the seller accepts and what the end buyer is willing to pay. The end buyer's price is driven by their required margin.
Here's how it works in practice. If the ARV is $250,000 and the end buyer needs a 20% margin ($50,000 net profit), they'll pay up to $200,000 minus repair costs. If repairs are $40,000, the end buyer's maximum price is $160,000 (this is the MAO). If you can contract the property from the seller at $145,000, your assignment fee is $15,000 — the gap between $145,000 (seller price) and $160,000 (buyer price).
Wholesale Spread Breakdown
The critical insight for wholesalers is that your fee is limited by the end buyer's margin requirements. If you set your assignment fee too high, the end buyer's profit shrinks and they walk away. A healthy assignment fee typically represents 20–40% of the end buyer's expected profit. Above 40%, experienced buyers push back or find competing deals.
This is why knowing the real spread in your market matters more than any formula. When you can see actual investor purchase prices per square foot, you know exactly what end buyers are willing to pay — and you can set your assignment fee and seller offer accordingly. You're not guessing; you're pricing based on real market data.
See Real Investor Purchase Prices and Calculate Your Spread Instantly
Smart Rental Investor's Investor Activity tool shows you what investors are actually paying per square foot in any market. Combine that with auto-calculated ARV and a full cost breakdown to know your exact spread before making an offer.
Related Articles
How to Calculate ARV (After Repair Value)
Learn the manual comp method vs. automated AVMs and avoid the most common ARV mistakes.
Wholesale Real Estate Calculator
Calculate your wholesale offer price instantly using real comparable sales and the MAO formula.
What Are Investors Paying for Properties?
See real investor purchase prices per square foot and learn how to use this data to price your deals.