Holding Costs: What Every Extra Month on Market Really Costs

Holding costs are the only line in a flip budget that keeps growing after you stop working. Rehab ends when the last invoice clears. Carry ends when the deal closes — and you do not control that date as tightly as you think.

Most budgets get the monthly number roughly right and the number of months badly wrong. That is the expensive half.

Price it per month first

Build the monthly figure line by line. Every one of these is a real bill somebody sends you:

• Property taxes — on the assessed value, not your purchase price, and not your ARV
• Insurance — a vacant-dwelling or builder's-risk policy, which costs more than the homeowner policy the seller had
• Utilities — power for the trades, water for the drywall, gas so the pipes do not freeze
• Lawn, snow, basic upkeep — cheap, and the first thing a neighbor complains about
• HOA dues — the line most often forgotten entirely, and the one that can carry a special assessment
• Loan interest — usually the largest single item, and the one that scales with how much you borrowed

Worked example (hypothetical). A house assessed at $200,000, bought with a $210,000 interest-only loan at 11%:

• Taxes: $200,000 × 2.2% = $4,400/yr → $367/mo
• Vacant-dwelling insurance: $2,400/yr → $200/mo
• Utilities: $180/mo
• Lawn and upkeep: $120/mo
• HOA: $45/mo
• Interest: $210,000 × 11% = $23,100/yr → $1,925/mo

Monthly carry: $367 + $200 + $180 + $120 + $45 + $1,925 = $2,837

That is about $95 a day, every day, whether anyone is working on the house or not.

Then multiply by the timeline you will actually hit

Here is where the money goes. Same house, three timelines:

• 6 months: $2,837 × 6 = $17,022
• 9 months: $2,837 × 9 = $25,533
• The three-month difference: $8,511

If your required profit on that deal was $40,000, a three-month slip just took 21% of it ($8,511 ÷ $40,000). You did not make a single bad decision about the house. The calendar did it.

And a slip is not exotic. It is one permit that takes five weeks instead of two, one cabinet order that arrives wrong, one buyer whose financing dies at day 24 and puts you back on market in a slower month than the one you listed in.

The mistake that hides all of this

The common failure is not underestimating the monthly number. It is estimating the timeline from the rehab schedule instead of from rehab plus everything after it.

Your hold period is:

1. Close to demo start (permits, mobilizing trades, ordering long-lead items)
2. Rehab duration
3. Punch list, cleaning, staging, photos
4. Days on market — which your market decides, not you
5. Contract to close — 30 to 45 days on financed buyers, and some of them fall through

A contractor saying "ten weeks" is answering question 2 only. Budget the other four or your carry number is fiction. Steps 4 and 5 alone routinely add two to three months to a "ten-week rehab."

What to do instead

Build the monthly number from actual bills, not a percentage. A rule of thumb like "1% of ARV per month" will be wrong in both directions — too high on a cheap house with a big loan, too low on an expensive one held a long time.

Use your submarket's median days on market as an input, not a hope. Pull it for your price band and property type, add your contract-to-close time, and treat the result as the floor.

Then add a cushion and price the deal at the cushioned number. If your honest estimate is six months, run the offer at seven or eight. If the deal only works at exactly six, it is not a deal with a cushion — it is a bet on the calendar.

Re-run carry when the timeline moves. The day you learn the permit will take five extra weeks is the day your maximum allowable offer on the next house should change, because you just learned something true about your market's pace.

Frequently asked questions

What are holding costs in real estate?

Every recurring cost of owning a property between purchase and sale: property taxes, insurance, utilities, basic maintenance, HOA dues and loan interest. They accrue per day of ownership regardless of whether work is happening.

How do you calculate holding costs on a flip?

Total the monthly bills — taxes, insurance, utilities, upkeep, HOA and interest — then multiply by your realistic hold period, which is permits plus rehab plus listing prep plus days on market plus contract-to-close.

Are holding costs part of the 70% rule?

Only implicitly. The 30% the rule holds back is meant to cover holding, buying, selling, financing and profit all at once, with nothing itemized — which is why the rule breaks on long holds and expensive money.

What is a typical holding period for a flip?

It varies too much by market, scope and financing for a national figure to mean anything for your deal. Build it from your own steps: permit time, rehab duration, listing prep, your submarket's median days on market, and your buyers' typical time to close.

Should I include my own labor in holding costs?

No — keep it separate. Holding costs are cash leaving your account for time. Your labor belongs in your required profit, where you can see whether the deal actually pays you for it.