You finish the rehab in eleven weeks, list the house, and the best offer comes from a buyer with an FHA loan. That offer cannot close, because the property is still inside a federal waiting period that started the day you bought it.
The rule is short. In 24 CFR 203.37a, the regulation covering FHA-insured sales: if the resale date is 90 days or fewer after the seller acquired the property, the property is not eligible for a mortgage insured by FHA.
When does the clock start and stop?
Both ends are defined in the regulation, and neither is the day you list.
- The acquisition date is the date the seller acquired the property, based on the date of settlement. That is your closing, not the day your offer was accepted.
- The resale date is the date of execution of the sales contract that will result in the FHA mortgage insurance. That is the day your buyer signs, not the day they close.
So the ninety days are yours to spend. Sign a contract on day 88 with an FHA buyer and the loan is ineligible even if closing is weeks away. Sign on day 91 and the rule is behind you.
Does the rule catch most flips?
No. It catches fast ones.
ATTOM’s Q1 2026 home flipping report puts the typical flip at 165 days from purchase to resale, which is well past ninety. The same report says 10.2% of flipped homes went to buyers using FHA-backed mortgages.
Read those two together and you get the shape of the problem. Most flips never touch the rule. A cosmetic flip that goes from closing to contract in under three months touches it, and when it does, it is bidding for a buyer pool that one flip in ten came from.
What does waiting an extra month cost?
Here is a house bought for $168,000 with a $42,000 rehab, finished and sold at a $285,000 after-repair value. Closing costs are 2% to buy and 8% to sell. Holding costs run $950 a month. The loan covers 85% of the purchase plus the whole rehab, at 10% interest with 2 points, so it is $184,800.
The first column sells at three months. The second waits for day 91 and sells at four.
| Three months | Four months | |
|---|---|---|
| Sale price | $285,000 | $285,000 |
| Purchase price | −$168,000 | −$168,000 |
| Rehab | −$42,000 | −$42,000 |
| Closing costs to buy (2%) | −$3,360 | −$3,360 |
| Holding costs ($950 a month) | −$2,850 | −$3,800 |
| Loan points (2% of $184,800) | −$3,696 | −$3,696 |
| Loan interest (10%) | −$4,620 | −$6,160 |
| Selling costs (8%) | −$22,800 | −$22,800 |
| Profit | +$37,674 | +$35,184 |
These are example figures, not a forecast for any market.
The wait costs $2,490: one month of holding costs and one month of loan interest. That is the price of keeping FHA buyers eligible, and it is the number to set against whatever the next-best offer is short of theirs.
It also moves the cash. Carrying the house a fourth month raises the out-of-pocket cash from $39,726 to $42,216, because holding costs and interest are paid as you go and the profit arrives only at closing. The month-by-month holding cost post runs the same arithmetic out to a year.
When does FHA want a second appraisal?
Past day 90 the restriction lifts, but one condition replaces it. Between 91 and 180 days after acquisition, the regulation says HUD requires the lender to get additional documentation if the resale price is 100 percent over the purchase price, and that documentation has to include an appraisal from a second appraiser.
That threshold sounds remote until you flip cheap houses, where a heavy rehab doubles a small number easily.
| Amount | |
|---|---|
| Sale price | $205,000 |
| Purchase price | −$95,000 |
| Rehab | −$55,000 |
| Closing costs to buy (2%) | −$1,900 |
| Holding costs ($700 a month, four months) | −$2,800 |
| Loan points (2% of $135,750) | −$2,715 |
| Loan interest (10%, four months) | −$4,525 |
| Selling costs (8%) | −$16,400 |
| Profit | +$26,660 |
This one resells at 116% over what the seller paid, so a second appraiser gets called in. A good rehab with receipts supports the price. A thin one may not, and if the second appraisal comes in low, the loan is sized on the lower figure and the deal reprices.
Which sales does the rule not apply to?
The regulation lists exceptions, and most of them describe a seller you are not. The time restrictions do not apply to HUD’s own sales of real-estate-owned property, sales of REO by other federal agencies, sales by nonprofits approved to buy HUD REO, properties the seller acquired by inheritance, employer and relocation-agency sales for a transferring employee, sales by state- and federally-chartered financial institutions and government-sponsored enterprises, sales by local and state government agencies, and sales in a presidentially declared disaster area once HUD gives notice.
A flipper who bought the house at auction or off the market fits none of those.
How do you plan around it?
Put day 91 on the schedule the day you close, alongside the rehab dates. Then the decision is a trade you can price rather than a surprise at the offer table.
- Work out your own gap. Run the flip at your finish date and again a month later in the flip calculator. The difference is what the wait costs.
- Check whether you are near double. If the sale price is anywhere near twice what you paid, budget for a second appraisal and keep the rehab receipts and permits together.
- Know the second-best buyer. A conventional or cash offer that is within the gap makes the wait pointless. One that is well under it makes waiting the cheaper choice.
The offer price is what decides all of this, so pin the resale value down first. Three comparable sales can move a flip’s profit by tens of thousands, as this walk through of ARV shows, and the 70% rule post covers what to subtract before you bid.