Ask an operator what a deal makes and you usually get one subtraction: after-repair value minus purchase price minus rehab budget. On a $400,000 ARV bought at $240,000 with an $80,000 rehab, that arithmetic produces $80,000 of apparent profit, and it is wrong by roughly eighty percent. The costs sitting between those three numbers: acquisition closing costs, origination, interest carry, taxes and insurance while you hold, the selling side, and then income tax, routinely consume most of the spread on a deal that looked comfortable.
This is not an argument that flips do not work. It is an argument for underwriting them the way a desk does, with every line named and priced, so the deals you take are the ones with genuine margin rather than the ones with a large-looking subtraction. What follows is the full stack, a worked example, and a sensitivity check showing how much room a typical deal actually has.
Five layers between the spread and the money
- Acquisition costs: what it takes to take title, beyond the purchase price itself.
- Financing costs: origination, valuation, legal, draw administration and the fees attached to speed.
- Carrying costs: interest, taxes, insurance, utilities and dues for every month you own it.
- Disposition costs: commission, seller-side closing costs, concessions and presentation.
- Income tax, not a deal cost at all, and frequently the largest single line.
Operators tend to model the first and the last and skip the three in the middle, which is precisely where the money goes.
Acquisition and financing
Taking title involves lender's title insurance, settlement or escrow fees, recording, and in many jurisdictions a transfer or documentary tax that can be substantial. Add a survey where required, specialty inspections, and your own inspection cost, which you pay whether or not you buy, meaning true acquisition cost includes the inspections on deals you walked away from. Transfer tax in particular ranges from negligible to a meaningful percentage of price, so look up your own county's figures once and keep them in the model.
On the financing side, origination points are the visible line and several others are not: valuation, sometimes a second valuation for the as-repaired opinion, lender legal and document preparation, entity review, wires, and a processing or inspection fee per draw. One structural question moves the total materially, whether interest accrues on the drawn balance or on the full commitment from closing. On a project with a large holdback, that difference over eight months is real money.
Carry: the cost of time
Carry is the line operators underestimate most, because it is the only cost that grows purely with delay. Every month you own the property you pay interest on the outstanding balance, property tax at the local rate, insurance, utilities and any dues.
Insurance deserves a specific note. A vacant property under renovation is not insurable on a standard homeowner policy; builder's risk or a vacant-dwelling policy is the usual instrument, and it typically costs more than an owner-occupied policy on the same house. Operators who model insurance at the price of their own homeowner's policy understate this line every time. And carry is a rate, not a fixed cost: two extra months on the example below is roughly $6,000, which is most of what remains of the profit.
The rehab number is never the rehab number
Budgets are estimates written before the walls are open. Discovery is normal: a failed sewer lateral, a rotted sill plate, aluminum wiring, unpermitted prior work that has to be corrected. That is why a contingency belongs in the budget and why an analysis using the budget total as a hard number is optimistic by construction. The second-order effect is usually larger than the first: discovery costs weeks as well as dollars, and weeks cost carry. A $12,000 surprise that adds five weeks is not a $12,000 problem.
Disposition costs
The selling side is the largest non-rehab cost in most flips and the one most often modeled at zero. Brokerage commission is the headline; seller-side title, escrow and closing fees follow; transfer taxes apply again in many jurisdictions; and buyer concessions are a routine feature of negotiations in many markets. Add presentation cost: staging, photography, a landscaping refresh, utilities kept on through showings, and repair credits from the buyer's inspection. That last item hits flippers hard, because a renovated house is held to a higher standard by inspectors than a distressed one.
The full stack, worked end to end
Here is the opening deal priced completely. Financing assumes an illustrative structure: 90% of purchase plus 100% of rehab, 2 points, an assumed 10.5% interest-only rate charged on the drawn balance, held seven months.
| Line | Amount | Basis |
|---|---|---|
| Purchase price | $240,000 | Contract price |
| Acquisition closing costs | $6,000 | Title, escrow, recording, transfer tax, inspections |
| Rehab budget | $80,000 | Documented line-item scope |
| Origination points | $5,920 | 2 points on a $296,000 commitment |
| Other lender fees | $2,000 | Valuation, legal, wires, draw and inspection fees |
| Interest carry | $15,312 | About $250,000 average drawn balance, 10.5%, 7 months |
| Property taxes | $2,800 | 1.2% of value, 7 months |
| Insurance | $1,050 | Builder's risk at $1,800/yr, 7 months |
| Utilities and site costs | $1,400 | $200/month, 7 months |
| Selling commission | $20,000 | 5% of a $400,000 sale |
| Seller closing costs | $6,000 | 1.5% of sale price |
| Buyer concessions | $4,000 | 1% of sale price |
| Total cost | $384,482 | Sum of the above |
| Sale at ARV | $400,000 | Appraised after-repair value |
| Pre-tax profit | $15,518 | Sale price less total cost |
The $80,000 spread became about $15,500 before income tax, and nothing went wrong. The rehab landed on budget, the property sold at appraised value, the hold was seven months. This is the good case.
Now be wrong by five percent and two months
Neither miss is unusual. Five percent on price is one soft month or one inspection negotiation. Two months is one discovery item and one buyer whose financing fell through.
Sell at $380,000 and selling costs fall proportionally: commission $19,000, seller closing $5,700, concessions $4,000, or $28,700 instead of $30,000, so total cost drops to about $383,182. Now add two months of carry: roughly $4,375 of interest, $800 of tax, $300 of insurance, $400 of utilities, or $5,875. Total cost is about $389,057 against a $380,000 sale. The deal loses roughly $9,057, after nine months of work. That swing, from $15,500 of profit to $9,000 of loss, is the entire point of the exercise.
The layer after the deal: income tax
A property bought, renovated and sold inside a year does not receive long-term capital gains treatment. Depending on facts and structure, gains on property acquired for resale can be treated as ordinary income, and an operator whose activity rises to the level of a trade or business may face self-employment tax on top. This is genuinely fact-specific and belongs with your CPA rather than a lender. It appears here only because operators consistently compare a pre-tax flip profit against a post-tax alternative, which flatters the flip.
Underwriting your own deal
The complete cost model
- Purchase price, plus title, escrow, recording, transfer tax and inspections at your county's actual rates.
- Rehab budget with a stated contingency of ten to fifteen percent of hard costs.
- Origination points and all lender fees, including per-draw processing and inspection charges.
- Interest carry at your realistic hold plus a buffer, computed on the average drawn balance if your program charges that way.
- Property tax at the assessed or reassessed rate for the months you will own it.
- Builder's risk or vacant-dwelling insurance, quoted rather than assumed.
- Utilities, dumpsters, lawn and site security for the full hold.
- Selling commission, seller-side closing costs, transfer tax where it applies again, and a concession allowance.
- Staging, photography and pre-listing presentation.
- A repair-credit allowance for the buyer's inspection.
- Your own time, priced at something, especially if you are self-performing work.
- A sensitivity case at five percent below exit price and two months beyond timeline, run together rather than separately.
What percentage of ARV should total costs come to?
There is no universal threshold; it depends on your cost of capital, your volume and your market's liquidity. More useful than a rule is the sensitivity test: if five percent on price plus two extra months turns the deal negative, the margin is too thin regardless of what the headline spread suggests.
Which cost do operators underestimate most?
Carry, then disposition. Carry because timelines are optimistic and because insuring a vacant renovation costs more than people assume. Disposition because commission, seller closing costs, concessions and repair credits are frequently modeled as commission alone.
Does paying cash make the deal materially better?
It removes points and interest, which are real savings, but replaces them with a much larger cash commitment and a lower return on capital deployed, and concentrates risk in one property. Whether that trade is worth it depends on how much capital you have and how many deals you could otherwise run at once.
How should I price my own labor?
At what it would cost to hire the trade, or what your time is worth in its next-best use, whichever is higher. Unpriced labor is the most common reason a first project appears more profitable than it was, and the reason the second and third disappoint.
Can I save money by selling the property myself?
Sometimes, though it usually trades commission savings against longer marketing time and a narrower buyer pool, and buyer-side compensation is often still in the picture. Since carry accrues monthly, the arithmetic frequently favors the faster sale. Run it as a comparison rather than assuming the savings are free.
What does an extra month actually cost?
On the worked example, roughly $2,940: about $2,188 of interest, $400 of tax, $150 of insurance and $200 of utilities. On a deal projecting $15,500 of profit, five extra months erases it. That ratio is why schedule discipline is a financial control, not just a project-management preference.
Should I count the deals I walked away from?
In your business model, yes. Inspections, appraisals and earnest money on deals that did not close are a real cost of acquisition volume. Operators who track cost per closed deal rather than cost per deal analyzed get a far more accurate picture of what the business earns.
Where to start
Take the last deal you completed, or the one you are analyzing now, and run every line in the checklist against it. Use actuals where you have them and quotes where you do not: insurance, title and transfer tax are all quotable in an afternoon. Compare the result to the headline spread you originally used. That gap is your model error, and it is the same on every deal until you fix it.
Then run the sensitivity: five percent below exit price and two months beyond timeline, together. Deals that survive are worth pursuing. Deals that do not are not bad deals in need of a better lender; they are deals in need of a lower purchase price, and that is a negotiation you can only have before the contract is signed.
Qualified Commercial Underwriting Desk
Credit and capital markets
The Qualified Commercial underwriting desk reviews commercial real estate, dealer and Main Street files daily. The Academy is written from that work (how files are actually read, priced and declined) rather than from a rate sheet.
Educational content only. Nothing here is a commitment to lend, an offer of credit, or tax, legal or accounting advice. Program terms, timelines and thresholds vary by lender, file and market conditions, and any figures shown are illustrative.