Holding Costs on a Flip: The Line Items Investors Forget

Every flip spreadsheet has two big numbers in it: what you paid and what the rehab costs. Both get scrutinized. Both get bid out.

Then there is the third number, the one that shows up in month seven and is almost never in the model at the time of the offer. Carry.

Holding costs do not ruin deals dramatically. They erode them quietly, at a few thousand dollars a month, until a 25% gross margin turns into something you would not have bought. ATTOM's Q1 2026 U.S. Home Flipping Report, published June 18, 2026, put gross profit per flip at $66,000 — down from $74,172 a year earlier. The cushion for schedule slippage is thinner than it was. This post builds the number properly.

The Eleven Line Items

Most investors budget three of these. Here is the full list.

The contingency line at the bottom is not padding. It is the arithmetic acknowledgment that the permit gets kicked back, the inspector reschedules, or the appraiser is booked out three weeks — none of which is anyone's fault and all of which costs a month.

Two of these deserve a flag. Insurance belongs in the carry budget at the builder's risk premium, not at a vacant dwelling rate — the two policies cover different things during active renovation, and getting it wrong is both a coverage gap and a budget error. We broke that down in builder's risk vs. vacant dwelling. And utilities are not optional: no power means no trades on site, which means the schedule slips, which raises every other line on this table.

Build the Monthly Burn Before You Bid

Total the eleven lines, annualize what needs annualizing, and divide by twelve. That single number is your burn rate, and it is the most useful figure in your model because it converts time directly into dollars.

Illustrative example. A $250K loan at 10%, $4,200 in annual property taxes, $2,800 for builder's risk, $180 a month in utilities, and $120 a month for lawn and security:

Call it roughly $3,000 a month. Now the only question that matters is how many months you are buying.

What Every Extra 30 Days Costs

Here is the same deal at four different hold lengths.

The gap between the 120-day plan and the 165-day reality is $4,449. Nobody made a mistake. No contractor walked off. The calendar did that, on a deal where the entire gross profit might be $40K.

And 165 is not a pessimistic number — it is the current national average days to flip in ATTOM's Q1 2026 report, up from 160 days in Q4 2025. The resale side is not getting faster either: Realtor.com's August 2026 housing report, published September 2, 2026, put national median days on market at 60 days, with 20.4% of listings taking a price cut. Your rehab timeline is only half of the hold.

Pro tip: Build your holding budget on 165 days, not 120. Pricing your carry to the optimistic number is how a 25% gross margin becomes a 12% net one — and ATTOM's 25.4% Q1 2026 return is a gross figure, before rehab and carrying costs. The net is what you keep.

Where Holding Costs Hide Inside the 70% Rule

The 70% rule says your maximum offer is 70% of ARV minus rehab. The 30% haircut is doing a lot of work: it is meant to cover holding costs, selling costs, financing costs, and your profit, all in one move.

On a $340K ARV with $60K of rehab, the rule gives you a $178K maximum offer and a $102K gross spread. Take out roughly $16K of carry at 165 days, about $24K in selling costs at 7%, and your financing points, and the profit left is real but a lot smaller than $102K looked.

That is fine — the rule is a screen, not a model. The failure mode is treating the 30% as pure profit and then discovering the carry inside it in month five.

Two adjustments make the screen honest. First, in a high-tax or high-insurance market, the 30% haircut is too thin on any hold past four months; underwrite the carry as its own line and let the rule tell you only whether the deal is worth modeling at all. Second, carry scales with the loan balance, not with the purchase price — so a deal financed at up to 90% LTC carries more per month than the same deal at 75%, even though the rule produces the identical maximum offer. Higher leverage buys you deal count and costs you burn rate. That is a real trade, and it should be a decision rather than a default. Build the rehab estimate and the carry line separately, and run both sides of the closing costs too. A first screen and a real underwrite are different documents.

Five Ways to Cut the Burn

1. Time your draws. Interest accrues on funds you have drawn. Requesting the full rehab up front and letting it sit is paying for money that is not working yet. Match the draw schedule to the actual construction sequence.
2. Right-size utilities. Keep power and water on, but drop to the smallest service tier the trades can work on. Skip cable, pool heat, and irrigation you do not need.
3. List before the punch list is done. Photos and marketing can start while final trim and touch-up are in progress. Two weeks of overlap is two weeks of carry you never pay.
4. Appeal the assessment. If the county set value on the pre-rehab condition and then reassessed mid-project, it is worth a call. Taxes are one of the few carry lines with a paper appeal.
5. Ask for an interest reserve or a funded first draw. Both move cash requirements off your balance sheet in the early months. Neither is free, but on a long hold the arithmetic often favors them.

Close Faster. Carry Less.

The cheapest month of carry is the one you never pay — and that starts with a lender who does not add three weeks to your schedule.

Term sheet in about 2 hours on average. Close in 5–10 business days. Fix and flip loans from 8.75%, up to 90% LTC. DSCR loans from 6.75% when the exit is a refinance instead of a sale. New construction up to 85–90% of cost. Lending in 45 states — everywhere except VT, UT, OR, SD and ND.

Terms are subject to underwriting, appraisal, title, and insurance. Rates are ranges, not promises — the deal sets the price.

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Want to pressure-test the carry before you bid? Run the deal through our calculator, then check your maximum offer against the 70% rule.