How to Analyze a Fix and Flip Deal (2026): Full Walkthrough With Real Numbers

A flip can look great on paper and still lose money. Purchase price and rehab costs are the easy part. The deals that surprise investors are the ones where hard money interest, carrying costs, agent commissions, and a slightly-low appraisal quietly consume the margin.

Fix and flip investing has one of the tightest margin profiles in real estate. Unlike a buy-and-hold rental where you can hold through a slow market, a flip has a hard stop: every month of delay costs money, and the exit is binary — you sell or you don't.

This guide walks through a complete fix and flip analysis using real numbers, from offer price to net check at closing, and shows exactly where most first-time flippers get the math wrong.

The Deal: Distressed Single-Family Home

Let's analyze a dated single-family home in a B-class suburban neighborhood. The property has dated finishes throughout, a functional but cosmetically rough kitchen, and two bathrooms that need a full gut. The bones are solid — good candidate for a flip.

• Asking price: $195,000 (motivated seller, 11 days on market)
• Our offer: $185,000
• After Repair Value (ARV): $300,000 (based on 3 sold comps within 0.4 miles)
• Estimated rehab: $40,000 (kitchen, 2 baths, flooring, paint, fixtures)
• Rehab timeline: 4–5 months, sell in month 6
• Financing: Hard money loan at 12% interest, 20% down, 2 points

Step 1: Build the Full Cost Stack

Most investors start with purchase price + rehab. That's only about half the picture. A complete flip cost stack includes seven line items:

The rehab contingency is non-negotiable. Rehab budgets almost always run over — plumbing surprises, permit delays, material price changes. Budget 10–15% on top of your contractor's quote; if you don't use it, it becomes extra profit.

Step 2: Run the 70% Rule Check

The 70% rule is the most widely used quick-filter in flip investing. It says the maximum you should pay is 70% of ARV minus repair costs:

Our offer of $185,000 is $15,000 above the 70% rule MAO. That means this deal fails the 70% rule — but that doesn't automatically mean it's a bad deal.

Step 3: Calculate Net Profit, ROI, and Annualized Return

Net profit is the simplest metric: sale price minus everything it cost to get there.

ROI measures that profit against the cash you actually had to put in. For a leveraged flip, cash invested is what you paid out of pocket — down payment, points, closing costs, rehab, carrying costs, and monthly interest payments:

Because this is a 6-month hold, the annualized return — what you'd earn if you could do this deal twice in a year — is:

The annualized figure is useful for comparing flip opportunities against each other and against other asset classes — but the absolute profit number is what you actually take home. Most investors use both.

The deal clears the bar: $29,060 profit, 29.4% ROI, and a break-even ARV of $270,940 — meaning the property could sell for $29,060 below ARV and you'd still break even. That margin is thin but real.

Step 4: Understand What Hard Money Actually Costs

Hard money is the most common financing tool for flippers — and the most misunderstood. The stated rate is usually 10–14% annually, but the real cost includes origination points paid at closing.

The $11,840 in total financing costs is why timeline discipline matters so much. Every additional month adds $1,480 in interest. If the rehab runs 3 months long:

• Additional interest: $1,480 × 3 = $4,440
• Additional carrying costs: $400 × 3 = $1,200
• Profit drops from $29,060 to $23,420

That's a 19% reduction in profit from a common, entirely fixable problem. Rehab timeline overruns are the single most controllable risk in a flip.

Step 5: Stress-Test the Deal Before You Buy

The base case looks good. But what happens when things don't go according to plan? Every flip should be stress-tested against three common failure modes:

The critical scenario is the ARV miss. A 10% downside on the sale price turns a $29K profit into a $1,460 breakeven — one bad contractor invoice away from a loss. This is why ARV accuracy is more important than rehab savings.

What Kills Flip Margins

Most flip failures aren't dramatic — no single catastrophic event. They're death by a thousand cuts from costs that were underestimated at the start.

Fix and Flip Return Benchmarks

What separates a solid flip from a marginal one? Here are the thresholds experienced flippers use to evaluate deals:

These benchmarks assume you're using hard money financing. All-cash flippers can accept slightly lower raw ROI because there are no financing costs — but annualized returns are harder to achieve without leverage.

When Fix and Flip Works Best

• Strong ARV spread: You can buy at 65–72% of ARV including rehab costs
• Predictable, cosmetic scope: Kitchen, baths, flooring, paint — no structural, no foundation, no permits that can delay
• Hot seller's market: Fast DOM means the property sells quickly after completion, minimizing carry
• Experienced contractor: Relationships with reliable contractors compress timelines and protect budget
• Off-market sourcing: Wholesale deals, direct mail, and MLS distressed inventory give you the purchase spread you need

When Flips Struggle

• High purchase-to-ARV ratio: Above 75% of ARV including rehab leaves almost no room for error
• Major structural work: Foundation, roof replacements, and additions blow timelines and budgets
• Slow markets: If it takes 90+ days to sell after renovation, additional carry eats the margin
• First-time contractor relationships: Unknown contractors are the #1 cause of timeline and budget overruns
• Rising interest rate environment: Hard money rates move with the market — a 2% rate increase adds $3K+ in interest to a typical deal
• Overestimated ARV: Buyers are sophisticated; retail buyers will not overpay for "flip finishes"

Fix and Flip Calculator: Run Your Own Numbers

The analysis above has 11 inputs. Changing any one of them — purchase price, ARV, rehab budget, hold period, interest rate — ripples through every metric. A calculator makes it possible to test multiple scenarios in seconds.

DealForge's fix and flip calculator models the complete cost stack, calculates net profit, ROI, and annualized return, runs the 70% rule check automatically, and stress-tests four key scenarios — all in real time as you type.

Bottom Line

A $185K purchase on a $300K ARV property with $40K in rehab generates about $29,000 in net profit — but only if the rehab stays on budget, the hold period doesn't slip, and the ARV holds. A 10% miss on the sale price turns that into a near-breakeven.

The deals that work in fix and flip investing aren't the ones with the most upside — they're the ones with the most margin for error. Model the downside first. If the deal still works when the ARV is 10% low and the rehab runs 3 months long, you have a deal worth making.

The key metrics to know before you make an offer: break-even ARV, total cash invested, and what happens to your profit in the worst-case scenario. Everything else is secondary.

Related reading: How to Calculate Maximum Offer Price · How to Analyze a BRRRR Deal · What Is a Good Cash-on-Cash Return · Cap Rate vs Cash-on-Cash Return · Rental Property Analysis Checklist · Real Estate Investment Risk Analysis