How to run a 70% rule offer without lying to yourself

The rule, in one breath

Your maximum offer is the after-repair value times 0.70, minus repairs:

The part everyone forgets: the 30% wedge is not profit. It has to cover buying costs, holding costs, selling costs, financing - and only then profit. When someone says "I'm buying at 70%," the honest question is: 70% of whose ARV, minus whose repair number?

Keep the order of operations

Multiply ARV by the selected percentage first, then subtract repairs. For a $400,000 ARV and $60,000 scope, the correct result is $400,000 × 0.70 = $280,000, then $280,000 − $60,000 = $220,000. Subtracting repairs first and multiplying the remainder produces $238,000, an $18,000 error.

The rule is shorthand, not an official standard

No appraiser, lender, tax authority, or government agency declares that every flip should be purchased at 70% of ARV. The percentage compresses transaction costs, time, uncertainty, and desired profit into one convention. It is useful when screening many leads, but the final ceiling must come from the actual property.

Scenario: Nina catches the formula error. Nina evaluates a $525,000 ARV property with $85,000 in repairs. Her partner subtracts repairs first and calculates $308,000. The correct sequence gives $282,500. Nina fixes the $25,500 error before anyone negotiates.

Worked example, with real costs

Say the comps support an ARV of $760,000 and the scope prices out at $54,000:

That $478,000 is a ceiling, not a verdict. Sanity-check it against the cost stack the Rehabfolio flip calculator runs by default - buying around 3% of purchase, a holding allowance, selling around 6% of ARV, and financing on an 80% loan at 10% plus 2 points over six months:

That is a healthy deal. Now watch the seller counter at $540,000 - only $62,000 higher. Re-run the same stack and the profit compresses toward $60k, under 9% of ARV. For six months of capital, permits, and crew risk, that is thin. This is what the rule is for: it tells you when to stop negotiating with yourself.

Where the rule breaks

Condos and luxury. The 30% wedge does not map to every product. Luxury inventory sits longer, so holding and financing eat far more of the wedge. Condo margins run thinner and HOA fees or a special assessment can quietly consume what is left.

Wholesale spreads. An assignment fee does not need a 30% margin. Quoting the 70% rule to justify a wholesale offer just tells the seller you are using the wrong playbook.

The repair number - the biggest lie. Underestimate the scope and the rule blesses a bad offer. At the same $760k ARV, calling the rehab $40k instead of $54k moves your max offer up $14,000. The rule did not fail; the input did. Walk the property, price the scope line by line, and add contingency before you run the rule - not after.

The ARV - the second-biggest lie. Which brings us to the part operators fudge the most.

Pressure-testing ARV like an adult

Sold comps only. Active and pending listings are asking prices - opinions. ARV has to be anchored to closed sales, adjusted for size, condition, and date.

City-locked. The same street name exists in two towns in most counties, and a comp from the wrong city can be worth $100k in the wrong direction. Every comp in your ARV should be from the subject's city. (Rehabfolio property research hard-locks comps and tax data to the subject city for exactly this reason, and drops ultra-luxury outliers rather than averaging them in.)

Do not floor to the cheapest comp. This one sounds conservative and is actually just lazy. The cheapest closed sale is usually the most distressed one - the estate sale, the divorce, the deferred-maintenance special. If your ARV is automatically "the lowest comp," you will systematically under-bid and lose good deals to buyers who did better comp work. The honest ARV is a point estimate you can defend with adjusted comps - where the cheap comp is explained, not obeyed.

Write the defense down. If you cannot say, in two sentences, why this ARV is right, you do not have an ARV - you have a hope.

Fannie Mae appraisal guidance emphasizes market-supported comparable selection and adjustments rather than unsupported rules of thumb. Its Uniform Appraisal Dataset guidance explains that comparable sales should be the best indicators of subject value and that adjustments should reflect market evidence.

Start with a downside, likely, and supported high value. Every unsupported $10,000 added to ARV raises a 70% ceiling by $7,000. If the deal works only at the high edge, it does not have a conservative ARV.

Replace the hidden 30% with the full cost stack

The property-specific formula is simple: expected sale price, minus every cost except purchase, equals the maximum offer. Treat your required profit as one of those costs.

Buying and financing

Include inspection, appraisal, legal and settlement services, title, recording, transfer charges, insurance paid at closing, prepaid items, lender points, origination, draw fees, extension fees, and required reserves. The CFPB Closing Disclosure explainer identifies common consumer mortgage charges. Investor loans may use different documents, so obtain a written term sheet and fee schedule.

Holding

Count taxes, insurance, utilities, security, yard care, HOA charges, interest, and operating costs from closing through payoff. Include permit time, contractor mobilization, inspections, punch work, market exposure, buyer financing, and a delayed closing. A six-month construction schedule can still become a nine-month hold.

Selling

Use the actual expected brokerage arrangement, seller closing costs, transfer charges, staging, photography, cleaning, concessions, warranties, and payoff fees. Do not use one universal percentage. IRS Publication 551 describes basis and settlement costs, while Publication 537 discusses selling expenses. Ask a tax professional how your project should be treated.

Repair scope and contingency

Use a measured scope with permits, equipment, disposal, protection, allowances, and a separate construction reserve. Every missing repair dollar raises the formula ceiling dollar for dollar. The renovation budget guide shows the complete process.

Scenario: Omar normalizes the cheap bid. Omar uses a $72,000 contractor total. Bid comparison shows that demolition disposal, permits, appliance connections, final paint, and a failing electrical panel are excluded. The realistic expectation is $94,000, so the rule-based ceiling falls $22,000.

Compare the rule with three property-specific offers

Case one: the shortcut is close

ARV is $450,000 and repairs are $70,000. The rule gives $245,000. Detailed buying and financing are $20,000, holding is $16,000, selling is $34,000, and required projected profit is $60,000. The full maximum is $250,000. The shortcut is a reasonable screen, but the detailed result controls.

Case two: expensive capital makes 70% too high

ARV is $350,000 and repairs are $45,000. The rule gives $200,000. High lender fees, a permit delay, fixed exit costs, and required profit bring non-purchase costs to $157,000. The property-specific maximum is $193,000. Offering the rule maximum removes $7,000 of planned cushion.

Case three: a fast project supports more than 70%

ARV is $800,000 and repairs are $55,000. The rule gives $505,000. Priya has documented low-cost financing, a six-week scope, strong liquidity, and a $95,000 profit requirement. All non-purchase costs total $230,000, producing a $570,000 maximum. She can offer above the rule while preserving her return. That does not make a higher percentage universally correct. Her cost stack explains the exception.

Use deal analysis to compare the rule with the actual project, then run downside cases for lower value, higher repairs, and a longer timeline.

Turn the analysis into a walk-away price

Your maximum is not the opening offer. It is the highest price supported by current assumptions and required return. Write it down before the seller counters.

Scenario: Tasha refuses to raise ARV. Tasha's full maximum is $318,000 and the rule gives $322,000. The seller counters at $335,000 and points to a higher sale. Tasha finds that the claimed comparable is larger and in a superior school area. She keeps the $318,000 walk-away and loses the contract. The disciplined no protects her capital.

Recalculate when a verified comp, inspection, bid, lender term, seller credit, or scope change alters the evidence. Fear of losing the deal is not new evidence. Read how to analyze your first investment property for the full acquisition workflow, and use property research to keep sources with the analysis.

Measure sensitivity before submitting the offer

Write down how much each major input moves the ceiling. At a 70% multiplier, a $20,000 ARV reduction lowers the rule result by $14,000. A $20,000 repair increase lowers it by the full $20,000. In the detailed model, a two-month delay also adds interest, taxes, insurance, utilities, maintenance, and possibly extension fees. This sensitivity review shows which fact deserves the most verification before your contingency period expires.

Also calculate the cash required, not only the projected profit. Include earnest money, down payment, closing funds, renovation cash before lender reimbursement, monthly carrying needs, and emergency reserves. A deal can show an acceptable margin and still fail because the investor cannot fund a draw delay or unexpected repair. Confirm the lender's draw inspection, reimbursement timing, required documentation, and extension process in writing.

Finally, decide which changes require a new approval. A small seller credit may not alter the decision. A changed roof scope, lower appraisal, shorter loan term, or missing comparable sale might. Preserving a written decision trail prevents negotiation momentum from quietly rewriting the investment standard.

Let the machine do the arithmetic

The rule fails in the inputs, not the math - but the math still has to be right, every time, for every lead. Every Rehabfolio underwrite computes the 70% max offer automatically (metrics.seventyRule) alongside the drafted ARV and repairs, and the flip calculator re-runs the full cost stack the moment any input moves. Your job is the judgment: the comps, the scope, the walk-away. The spreadsheet arithmetic is the machine's job.