Fix-and-Flip Math: How to Evaluate a Deal Before You Buy

Quick Answer

Buy distressed property at 70% of ARV (after-repair value). Spend 15-25% on renovations. Sell at 95% of ARV (list low to sell fast). Profit = ARV - purchase - renovations - holding costs - realtor fees. Target 15-20% profit margin.

The Fix-and-Flip Formula

Profit = ARV - (Purchase Price + Renovation + Holding Costs + Sale Costs)

Real Example: $150K Purchase to $400K Sale

Step 1: Establish ARV

• Comparable homes in neighborhood sell for $400K
• ARV (what renovated property will sell for): $400K

Step 2: Determine Max Purchase Price (70% of ARV)

• 70% × $400K = $280K max offer
• Find property listed $150K (distressed, bank-owned)
• Negotiate to $150K

Step 3: Plan Renovations

• New roof: $12K
• Kitchen rehab: $15K
• Bathrooms (2): $10K
• Flooring: $8K
• Paint/cosmetics: $5K
• Total: $50K

Step 4: Calculate Holding Costs

• Hard money loan: $120K @ 10% for 6 months
• Interest cost: $6K
• Property taxes (6 months): $1,200
• Insurance: $600
• Utilities: $600
• Total: $8,400

Step 5: Estimate Sale Costs

• Realtor commission (6%): $24,000
• Closing costs: $4,000
• Total: $28,000

The Math:

• ARV: $400,000
• Purchase: -$150,000
• Renovations: -$50,000
• Holding: -$8,400
• Sale costs: -$28,000
• Profit: $163,600

Profit margin: 40.8% (exceptional)

More Realistic Scenario

Above example was lucky (great deal, perfect execution). Reality:

Same property, realistic:

• ARV: $350K (market slower than thought)
• Purchase: $150K
• Renovations: $50K (overran by $5K) = $55K
• Holding: $10K (took 8 months)
• Sale costs: $21K (lower selling price)

Profit: $350K - $150K - $55K - $10K - $21K = $114K

Profit margin: 28.5%

Still excellent, but much more realistic.

The 70% Rule (Simplified)

Rule: Make offers at 70% of ARV

This leaves room for:

• Renovations (15-25% of ARV)
• Holding costs (5% of ARV)
• Realtor fees (6% of sale)
• Lender fees (1-2%)
• And still profit 15-20%

Example:

• ARV $400K
• 70% = $280K max offer
• If you buy at $150K, you have $130K cushion (nice!)

Holding Cost Variables

Months to flip: 4 vs. 8 months = 2x holding costs

Hard money rate: 8% vs. 14% = 5%+ difference on $150K = $7,500 extra cost

Location: Urban (fast flip, 3-4 months) vs. Rural (slow flip, 6-8 months)

Common Mistakes

Mistake 1: Underestimating renovations

• Budget $40K, actually spend $65K
• Kills profit margin

Mistake 2: Overestimating ARV

• Assume $400K, actual comps are $350K
• Negative equity

Mistake 3: Not accounting for holding costs

• 6-month flip with 10% loan rate = $7,500 extra cost
• Many flippers ignore this

Mistake 4: Assuming 100% of ARV sale

• Most properties sell at 95-98% of asking
• Need to account for discount

Mistake 5: Slow market

• Budget 4 months, takes 8 months
• Double the holding costs

Renovation Budget Breakdown

Typical renovation (2 bed, 1 bath, 1,200 sqft):

For $300K purchase, this is 18-31% of cost (reasonable).

The 1.2x Rule (Alternative to 70%)

Some flippers use: Buy price should be ≤ 1.2x renovation costs

Example:

• Renovations: $50K
• Max buy: $50K × 1.2 = $60K
• This ensures low basis

Works when you know renovation costs well.

When to Skip a Deal

Skip if:

• ARV can't be verified (use 3+ comps)
• Holding costs exceed profit
• Profit margin < 15%
• You can't get financing easily
• Property needs more than 25% of ARV in renovation

Market Conditions Matter

Buyer's market (2025-2026):

• More distressed properties
• Easier to negotiate
• Longer holding periods
• Tighter margins (7-12% profit)

Seller's market:

• Fewer distressed deals
• Higher purchase prices
• Faster sales (fewer holding costs)
• Better margins (20%+)

Team You Need

• Contractor: Accurate renovation estimate
• Real estate agent: Accurate ARV
• Lender: Hard money, fast approval
• Accountant: Tax optimization

Real Example (Bad Deal)

Looking at: $200K property, ARV $350K

Initial analysis:

• Buy: $200K (57% of ARV - seems good)
• Reno: $40K (9% of ARV)
• Sale: $350K
• Profit: $110K

But deeper analysis:

• Property needs foundation work: $15K additional
• ARV is really $320K (few comparables)
• Holding costs at 10% loan for 8 months: $13K
• Sale costs (realtor + closer): $20K

Real profit:

• $320K - $200K - $40K - $15K - $13K - $20K = $32K

Profit margin: 9.1% (terrible, skip this deal)

The Experience Curve

First-time flippers average 10-15% profit margin (if they break even).

Why? Learning costs:

• Underestimate renovations
• Overestimate ARV
• Underestimate holding costs
• Dealing with code violations discovered during renovation
• Tenant/market surprises

By flip #5-10, experienced flippers achieve 20%+ margins consistently.

Moral: First flip is a learning investment. Don't expect to hit 20% margin on deal #1.

Seasonality in Flipping

Best time to flip:

• Spring (April-June): Buyers active, good market conditions
• Summer (July-August): Peak buying season

Worst time to flip:

• November-January: Fewer buyers, longer holding periods
• Off-season flips cost 10-20% more in total cost (extended carrying costs, harder sales)

Time your renovations to list homes in spring/summer for best results.

The Flip vs Hold Decision

Once renovated, some flippers face a decision:

• Flip it: Sell now, take profit ($100K+), move to next deal
• Keep it: Rent it out, collect $500-800/month cash flow long-term

Example:

• Flipped property ARV: $400K
• Profit if sold: $100K (immediate)
• Rent if kept: $2,000/month, 4-5% cap rate
• Annual cash flow: $20,000/year
• In 5 years: $100K in profit collected (same as flip)
• In 30 years: $600K+ collected (far exceeds flip profit)

Decision: Need cash vs want long-term wealth.

Most successful investors:

• Flip 3-4 properties per year (active income, learning)
• Keep 1 per year as rental (passive wealth)

Sources

• BiggerPockets. (2026). "Fix and Flip Analysis Guide."
• NAREIA. (2026). "Real Estate Flipping Market Report."
• IRS. (2026). "Capital Gains on Property Flips." Publication 17.
• NAR. (2026). "Flipping Statistics and Market Data."
• Private Lender Networks. (2026). "Hard Money Lending Terms."