The Max-Bid Model: What to Pay at a Texas Foreclosure Auction

The one number that decides whether a deal makes money is the number you set before you ever raise your hand: the most you are willing to pay. At a Texas foreclosure auction the sale is cash, final, and there is no inspection contingency, so the discipline has to live in a model you build the night before, not in the heat of the bidding. This guide gives you that model twice: the fast 70% rule for a quick screen, and a full cost-stack that tailors the number to a specific house.

This is general information, not legal or financial advice.

Every figure below is illustrative. The point is the structure of the model, not the exact dollars, which change with the property, the market, and your own cost of capital. Plug in your own numbers and the logic holds.

Start from the exit, not the entry

Amateurs start with "what will it take to win?" and back into a price that loses money. The model runs the other way. You start from the resale value and subtract every cost between today and the day you cash out, including the profit you require for taking the risk. Whatever is left is the most you can pay.

For a single-family flip, the resale value is the after-repair value (ARV): what the house sells for once it is fixed and back on the market. Get the ARV wrong and every other number is decorative, so this is where most of your homework goes. Pull three to five recent sold comparables within about half a mile, similar in size, age, and condition, and lean on sold prices rather than active listings or an automated estimate. On Fclosure the appraisal-district value and nearby sales give you a defensible starting point before you order a formal comp set.

Say the subject is a Dallas 3-bed, 2-bath house. Your comps support an ARV of $320,000 once it is renovated, and a contractor walk-through puts the rehab at $45,000. Those two numbers drive everything that follows.

The 70% rule: a 30-second screen

The 70% rule is the back-of-the-napkin version investors use to decide whether a deal is even worth modeling in full:

• Take 70% of the ARV.
• Subtract the estimated rehab.
• The result is your maximum offer.

For the Dallas example:

• 70% of $320,000 is $224,000.
• Minus $45,000 in rehab.
• Maximum bid: $179,000.

The 30% you shaved off the ARV is not profit. It is a bundled allowance meant to cover your holding costs, financing, selling costs, and profit all at once. That is the rule's strength and its weakness: it is fast, but it applies the same fixed haircut to a $150,000 house and a $600,000 house, even though their cost structures are not proportional. Use it to reject deals quickly. Do not use it to justify your top bid on a deal you actually want.

The cost-stack: the number you bid on

When a property clears the screen, build the real model. List every cost between the auction and the closing table on the resale, then subtract them from the ARV along with your required profit. What remains is the true ceiling.

The cost-stack in this example lands at $191,600, which is actually higher than the 70% rule's $179,000. That is not a contradiction. It tells you the rule was conservative for this particular house, and it shows you exactly which levers move your ceiling: a tighter rehab scope, a faster resale, or a lower profit requirement each raise the number, while a longer hold or higher financing cost lowers it.

Key takeaway. The 70% rule tells you whether to look. The cost-stack tells you what to bid. If they disagree, trust the cost-stack, because it is built from this property's real costs instead of an average.

What moves your maximum bid

The value of building the cost-stack is that you can see which assumptions your ceiling depends on. Change one input and watch the maximum bid move, holding the $191,600 base case constant:

Read the table as a warning as much as a menu. The two changes that raise your ceiling, a lower profit requirement and a faster sale, are also the two that shrink your margin for error. Bidding up because you assume a three-month resale only works if the resale actually closes in three months. The changes that lower your ceiling, a rehab overrun most of all, are the ones that happen without asking. This is why disciplined bidders model the pessimistic case and bid off that, not the optimistic one.

A practical habit: build the cost-stack twice, once with your base assumptions and once with a rehab overrun and a slower sale. If the deal still clears your minimum profit in the pessimistic version, it is robust. If it only works in the optimistic version, the maximum bid you should carry to the auction is the pessimistic one.

The costs people forget

The line items that sink first-time auction buyers are rarely the obvious ones like rehab. They are the quiet ones:

1. Junior and senior liens. A trustee's deed conveys the interest that secured the foreclosing lien, subject to anything senior. If a senior lien or unpaid property taxes survive the sale, you inherit them. Check the lien position before you bid, not after.
2. Occupancy. If the former owner or a tenant is still in the house, you may face an eviction that costs time and money the model did not include. Budget for it when the occupancy status is unknown.
3. Condition risk. You usually cannot get inside before the sale, so your rehab number is an estimate built from the exterior and comparable properties. Pad it, and treat the auction-and-cleanup buffer as real, not optional.
4. Holding longer than planned. Six months of taxes and insurance is an assumption. If the renovation or the resale slips, holding costs climb and your profit shrinks dollar for dollar.

Each of these is a reason the cost-stack includes a buffer line and a profit line that you do not spend before the deal is done.

How to use the model on auction day

Build the model the night before and write the maximum bid on a card. The number is a ceiling, not a target: if the bidding passes it, you walk, because the next property on Fclosure's list is a fresh chance to apply the same discipline. Winning an auction at the wrong price is not a win.

A short pre-auction checklist keeps the model honest:

• Confirm the ARV with sold comps, not listings or an automated value.
• Get a real rehab range, then use the higher end.
• Verify the lien position and any surviving property taxes.
• Note the occupancy status and budget for a possible eviction.
• Set the maximum bid, and do not move it once the auction starts.

The investors who compound over years are not the ones who win the most auctions. They are the ones who never pay above their model. Fclosure exists to feed that model: every active Texas foreclosure auction listing comes with the sale date, the original notice, the appraisal value, and an equity estimate, so you can screen dozens of properties and only build the full cost-stack on the few that clear the 70% rule.

Put the model to work

Setting a maximum bid is not the hard part once you have the framework. The hard part is having enough qualified properties to point it at, and the discipline to walk when the price runs past your ceiling. Start with the live list, screen with the 70% rule, and reserve the full cost-stack for the deals worth winning.

Keep one more habit: after each auction, whether you won or walked, write down the property, your maximum bid, and the price it actually sold for. Over a few months that log tells you where your market is clearing, whether your rehab estimates hold up, and how often the winning bid ran past a disciplined ceiling. The model is only as good as the inputs you feed it, and the fastest way to sharpen those inputs is to compare your numbers against what the market actually did.

More reading: all guides · the blog