24 Hour Cash Offer Calculation for Detroit Sellers With Tax Checks
Cash offer calculation works backward from your home’s after-repair value (ARV): Offer = ARV − Repairs − Holding Costs − Selling Costs − Margin. Say your home’s ARV is around two hundred fifty thousand dollars, with repairs, holding costs, selling costs, and buyer’s margin adjusted accordingly. These factors together determine a cash offer that’s significantly below the ARV, reflecting typical investor calculations.
TL;DR:
- The cash offer calculation relies on accurate comparables, repair estimates, and regional costs, with small deviations significantly impacting the final number.
- Estimating ARV requires recent local sales within a mile, adjusted for differences, and should not be based solely on automated tools.
- Holding costs depend on property-specific expenses and the expected duration of ownership, with longer holds increasing costs and reducing offers.
- The 70% rule provides a quick benchmark but often underestimates risks like structural issues or regional cost variations, making detailed calculations more reliable.
- Transparency in showing comps, repair scope, and proof of funds helps sellers evaluate offers more effectively and negotiate better terms.
Table of Contents
- Cash Offer Calculation: The Core Formula and Instant Calculator
- Getting the Inputs Right: ARV, Repairs, Holding, Selling Costs, and Margin
- The 70% Rule and When It Doesn’t Fit Your Situation
- Worked Examples: Two Full Cash Offer Calculations
- Evaluating and Negotiating a Cash Offer You Receive
- Tax Rules Sellers Should Check Before Accepting an Offer
- How Sell Dave Your House Applies This Math for Detroit Sellers
- Adjusting for a Buyer Using Partial Financing
- Regional Cost Differences That Change Your Number
- What the Math Actually Tells Sellers
- Get a Cash Offer Based on Real Numbers, Not Guesswork
- Sources
- FAQ
Cash Offer Calculation: The Core Formula and Instant Calculator
Every legitimate cash offer traces back to one equation. Offer = ARV − Repairs − Holding Costs − Selling Costs − Margin. Each variable answers a specific question about the property and the deal.
- ARV is what the home would sell for once fully repaired and updated, based on recent comparable sales.
- Repairs covers every line item needed to reach that ARV condition, plus a contingency buffer.
- Holding costs are the carrying expenses (taxes, insurance, utilities, financing) that accrue while the buyer owns the property before resale.
- Selling costs include the commission and closing fees the eventual buyer will pay when the home resells.
- Margin is the profit or risk cushion the buyer needs to justify tying up cash in the deal.
Two of those inputs have their own mini formulas worth memorizing. Holding costs equal your daily carrying cost multiplied by the number of days the property will likely be held: Holding = Daily Carry × Days Held.
Before you plug in any numbers, verify the ARV itself. A cash offer calculator is only as reliable as the comps feeding it, so pull at least three recent sales within roughly half a mile to one mile of your home, sold in the last three to six months, and adjust for square footage and condition differences.
Here’s a quick sequence you can run on a spreadsheet or even a phone calculator app:
- Pull three to six comparable sales and average them into an ARV estimate.
- List every repair item and total the estimate, then add 10% to 20% for contingency.
- Estimate days held and multiply by your daily carry rate.
- Multiply ARV by an estimated selling cost percentage (5% to 6% for commission, plus 1% to 3% for closing fees).
- Subtract a reasonable margin, often 10% to 15% of ARV for investor buyers.
- Subtract all four cost categories from ARV to land on your estimated offer.
That sequence gives you a workable number in minutes, though the accuracy of each input still depends on how carefully you build it. That’s what the next section covers.
Getting the Inputs Right: ARV, Repairs, Holding, Selling Costs, and Margin
The formula is simple. Getting honest numbers into it is where most sellers go wrong, usually by trusting a single online estimate or skipping the contingency math entirely.
Estimating ARV accurately starts with real comparable sales, not an automated valuation tool alone. Pull three to six comps that sold within the last three to six months, located within about a half mile to one mile of your property. Adjust each comp up or down for differences in square footage, bedroom count, lot size, and finish quality. Federal guidance on property valuation stresses that valuations must reflect the property’s actual physical condition and be backed by documented local market data, not shortcuts that trade accuracy for speed.
Building a realistic repair budget means walking the property room by room and writing a line-item scope: roof, HVAC, kitchen, bathrooms, flooring, electrical, plumbing. Get one or two contractor bids if you can, and price everything at investor-grade rates rather than retail remodel pricing. Then add a contingency of 10% to 20% on top of that total, since initial repair estimates commonly underrate hidden problems like water damage behind walls or outdated wiring that only shows up mid-renovation. Our guide on renovation costs versus a cash offer walks through how repair scope changes the math on an as-is sale.
Calculating holding costs requires listing every carrying expense that accrues monthly: property taxes, insurance, utilities, HOA dues if applicable, and financing costs if the buyer uses a loan or hard money. Add those up, divide by 30 to get a daily rate, then multiply by the expected days held. A property expected to sell in 60 days carries a much smaller holding cost than one stuck in permitting delays for six months.
Accounting for selling costs means budgeting for what it costs to resell the finished property, not just what it costs to buy it. Off-market resales (buyer to buyer, no agent) can shave that down, but most calculations assume a standard retail resale at the end.
Setting the margin is the part sellers most often underestimate in importance.
Here’s how tightening or loosening each input shifts your bottom line:
- Raising ARV by $10,000 raises the offer by roughly $10,000, all else equal.
- Raising the repair contingency from 10% to 20% on a $30,000 repair budget cuts the offer by $3,000.
- Extending the hold from 60 to 120 days at $50 a day in carrying costs cuts the offer by $3,000.
- Reducing target margin from 15% to 10% of a $250,000 ARV raises the offer by $12,500.
Pro Tip: Ask any buyer for their comp set and repair estimate before you accept an offer. If the numbers don’t match what you’d find pulling your own comps, that gap tells you exactly where to negotiate.
The 70% Rule and When It Doesn’t Fit Your Situation
The formula: MAO (Maximum Allowable Offer) = (ARV × 0.70) − Repair Costs. It bundles holding costs, selling costs, and margin into that single 30% discount off ARV, rather than calculating each one separately.
On a $250,000 ARV home needing $30,000 in repairs, the math looks like this: $250,000 × 0.70 = $175,000, minus $30,000 in repairs, equals a $145,000 maximum offer. The rule and its common variations show up across the fix-and-flip industry precisely because it’s fast to run in your head.
Experienced buyers adjust it based on risk:
- 65% multiplier applies to high-uncertainty deals: unknown foundation issues, limited inspection access, or a property that’s sat vacant and exposed for years.
- 75% to 80% multiplier applies when rehab needs are minor, predictable, and time-to-resale is short, often in hot markets where inventory moves fast.
- 70% multiplier is the default middle ground most buyers start from before adjusting for specifics.
Rule-based heuristics break down in a few predictable spots. They understate risk on properties with structural or foundation problems, where actual repair costs routinely exceed initial estimates. They also misfire in markets with unusually high property taxes or insurance premiums, since the flat percentage doesn’t account for regional cost differences. And they can shortchange sellers in genuinely hot markets, where actual holding and selling costs run lower than the rule assumes, meaning the seller might negotiate a higher offer than the rule alone suggests.
The full formula, with real numbers plugged into each input, will always be more accurate for your specific property.
Worked Examples: Two Full Cash Offer Calculations
Numbers make this concrete. Here are two scenarios that show the formula end to end, using different hold periods and risk profiles.
Example 1: Light rehab flip, fast turnaround.
- ARV based on three comps: $250,000.
- Repair scope (cosmetic, kitchen refresh, flooring): $25,000, plus 10% contingency = $27,500.
- Holding period: 120 days at $50/day carrying cost = $6,000.
- Selling costs: 7% of ARV = $17,500.
- Margin: 10% of ARV = $25,000.
- Offer = $250,000 − $27,500 − $6,000 − $17,500 − $25,000 = $174,000.
Example 2: Rental-to-resale, longer hold, higher buffer.
- ARV based on four comps: $250,000.
- Repair scope (roof, HVAC, full interior): $45,000, plus 15% contingency = $51,750.
- Holding period: 240 days (longer timeline to stabilize as a rental before resale) at $55/day = $13,200.
- Selling costs: 8% of ARV (higher due to added marketing time) = $20,000.
- Margin: 15% of ARV (wider cushion for the longer, riskier hold) = $37,500.
- Offer = $250,000 − $51,750 − $13,200 − $20,000 − $37,500 = $127,550.
The gap between these two offers, nearly $46,500 on the same $250,000 ARV, comes entirely from repair scope, hold length, and margin assumptions. That’s the real lesson: ARV sets the ceiling, but everything below it determines how close to that ceiling your actual offer lands.
Run a quick sensitivity check on either scenario. That’s a $7,375 swing from two modest cost overruns, which is exactly why testing best-case, base-case, and worst-case scenarios before accepting any number matters more than trusting a single static estimate.
Evaluating and Negotiating a Cash Offer You Receive
Once you have an offer in hand, the real work is verifying it holds up and knowing where you have room to negotiate.
Start with a documentation checklist. Ask the buyer to show you their comps (the properties they used to calculate ARV), their itemized repair estimate, proof of funds showing they can actually close in cash, a specific closing timeline, and a clear list of which closing costs they’re covering versus which fall on you.
If those documents check out, you still have negotiation levers available:
- Repair credit adjustments if you believe their repair estimate is inflated relative to the property’s actual condition.
- Closing cost coverage since many buyers will absorb some or all standard closing costs as part of the deal.
- Timeline flexibility if you need more time to move out or less time to avoid extra mortgage payments.
- Earnest money protections, making sure any deposit is refundable if the buyer backs out for reasons outside your control.
Watch for red flags that suggest the offer isn’t built on honest math. An unexplained gap between the offer and your own back-of-envelope calculation, using real comps, often points to an inflated margin. A buyer who won’t disclose their comps or proof of funds is asking you to trust numbers you can’t verify. And nonrefundable earnest money tied to overly broad escape clauses shifts almost all the risk onto you. Seller concessions like repair credits and closing cost coverage are standard tools in most markets, and a buyer unwilling to discuss them at all is worth a second look.
Pro Tip: If a buyer’s offer feels low, ask them to walk you through their ARV and repair math line by line. A legitimate buyer will do this without hesitation. One who deflects usually has a number that doesn’t hold up to scrutiny.
Tax Rules Sellers Should Check Before Accepting an Offer
Your cash offer number and your after-tax proceeds are two different figures, and skipping this step is one of the most common mistakes sellers make.
If the home was your primary residence, you may qualify for the IRS home-sale exclusion, which lets eligible sellers exclude up to $250,000 of capital gain ($500,000 for married couples filing jointly) as long as you meet ownership and use tests, generally having owned and lived in the home for two of the last five years.
To figure out whether you owe anything beyond that exclusion, you need two numbers. IRS Publication 523 provides the worksheets:
- Amount realized equals your selling price minus selling expenses like commissions and closing costs.
- Adjusted basis equals your original purchase price plus qualifying improvements, minus certain deductions you’ve already claimed.
Subtract adjusted basis from amount realized to find your gain, then compare that gain to your exclusion limit. Inherited properties and partially rented homes have their own basis rules that get complicated fast, so talk to a tax professional if either applies to you. Our breakdown of capital gains on inherited houses covers the inherited-property side in more depth.
How Sell Dave Your House Applies This Math for Detroit Sellers
Some local buyers run the same ARV-backwards calculation described throughout this article, built on many years of experience buying homes. When you request an offer, expect a fair, all-cash number within 24 hours, based on real comps and a repair assessment.
The process can stay as-is from start to finish. Often there is no repair list to complete, no cleaning to do, and no realtor commissions or hidden fees affecting your number. Closing can happen quickly if you need speed, or on a timeline that works for your situation, whether that’s an inherited property, a home in disrepair, foreclosure pressure, or simply wanting to skip the listing process.
Ask any buyer, including Sell Dave Your House, for the documentation covered in the negotiation checklist above: comps, repair estimate, proof of funds, and a clear closing timeline. You can start that conversation directly through the Detroit cash offer request page, where the same transparency principles from this guide apply to your specific property.
Adjusting for a Buyer Using Partial Financing
Some buyers use partial financing, hard money loans, or a private lender covering part of the purchase, which changes the math slightly even if the seller still receives a lump sum at closing.
From your side as the seller, a partially financed offer should still close on the timeline promised, since the financing arrangement is the buyer’s responsibility to secure before making an offer. But it’s worth asking directly whether financing is involved, because financed deals carry more risk of delay if the buyer’s lender requires an appraisal or additional underwriting steps.
From the buyer’s side, financing costs (loan origination fees, interest during the hold period, and lender fees) get folded into the holding costs portion of the formula. That pushes total holding costs higher, which pushes the calculated offer lower to protect the buyer’s margin.
If you’re comparing two offers and one is lower than expected, ask whether financing costs are part of the reason. A true all-cash buyer with no financing dependency often has more flexibility on price and timeline precisely because they’re not carrying loan interest into their holding cost calculation. That flexibility is one reason cash-only buyers can sometimes offer terms that financed buyers can’t match on speed or certainty.
Regional Cost Differences That Change Your Number
The same formula produces different results depending on where the property sits, mostly because holding costs and selling costs vary sharply by region.
Property tax rates differ significantly from one county or municipality to the next, and that difference flows directly into the holding cost calculation. A property with a higher annual tax bill carries a higher daily rate, which adds up fast over a 90 or 120 day hold. Homeowners insurance premiums follow a similar pattern, with older housing stock, specific roofing materials, or higher local claims history all pushing rates up in some neighborhoods more than others.
Selling costs also shift by market. Areas with higher average agent commissions or higher typical closing fees push that percentage of ARV up, which lowers the final offer even if repair and holding costs stay identical to a comparable property elsewhere.
Local market conditions add another layer. In a hot market with low inventory, buyers often compress their margin and hold assumptions because homes move fast, which can support a higher offer. In a slower or cooling market, buyers typically widen both the holding period assumption and the margin, since resale takes longer and carries more uncertainty. National market indicators tracking cash-sale share and buyer behavior show these local shifts happen continuously, which is exactly why the same property in two different market cycles can generate two different fair offers using the identical formula.
What the Math Actually Tells Sellers
The rule is a shortcut for buyers running quick mental math on dozens of properties a month. It was never built to explain your specific situation, and treating it as a fixed benchmark leads sellers to either reject fair offers or accept low ones without knowing why the number landed where it did.
What actually matters is whether you can see each input: the comps behind the ARV, the line items behind the repair estimate, the assumptions behind the hold period. A buyer willing to show that work is giving you something more valuable than a slightly higher number, and that’s the ability to verify it yourself.
Prioritize transparency over speed when comparing offers, even though speed matters too. The seller who asks for comps and a repair breakdown before signing anything ends up with a far better sense of whether their offer reflects real market value or just a number designed to close quickly.
— Real Estate Team
Get a Cash Offer Based on Real Numbers, Not Guesswork
This approach offers an alternative to listing with an agent and waiting on repairs, showings, and financing contingencies to fall through. You can receive a fair, all-cash offer within about 24 hours, built on the same ARV-backwards math covered throughout this guide, often with no commissions, no repair requirements, and no hidden fees subtracted at closing.
This approach fits homeowners facing foreclosure pressure, an inherited property they don’t want to manage, a home too worn down for the traditional market, or simply a timeline that can’t wait on a months-long listing process. Closing can happen quickly when needed, or on a schedule that matches the seller’s situation.
If you want to see your own number, start by requesting a cash offer for your Detroit-area home and ask for the comps and repair estimate behind it, the same due-diligence steps this guide recommends with any buyer.
This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.
Sources
- IRS Topic No. 701 Sale of Your Home
- Interagency appraisal and evaluation guidance
- Seller concessions (NAR)
- Cash Offer Calculator — CalculatorCorp
FAQ
What Is the 70% Rule in Real Estate?
Buyers commonly adjust that percentage between 65% and 80% depending on how predictable the repair scope is and how fast the local market moves, as shown in common fix-and-flip calculations.
How Much of a Discount Should You Expect With a Cash Offer?
The discount depends on your repair needs, holding costs, and the buyer’s target margin, not a single fixed percentage.
How Fast Can You Close on a House With a Cash Offer?
Cash offers typically close in one to three weeks since there’s no mortgage underwriting to wait on. Sell Dave Your House can close in as little as seven days when a seller needs that speed, or on a longer timeline if that works better for the seller’s move.
Is 10% Over Asking a Strong Offer for a House?
Cash offers work differently, since they’re calculated backward from ARV rather than compared to a listing price, so the more relevant question is whether the offer’s math (ARV, repairs, holding costs, margin) lines up with your own comps and repair estimate.
What Does Sell Dave Your House Charge to Buy My Home?
Sell Dave Your House does not charge commissions or fees, and covers standard closing costs as part of its offer. Current pricing and offer details are available directly on the Sell Dave Your House website.