Start with the profit equation
A maximum offer is the most you can pay while still meeting a chosen target in your model. For a fixed dollar-profit target, subtract every other project cost and that target from expected resale proceeds.
This calculation uses profit before income taxes. It assumes that the non-purchase costs entered stay fixed, apart from selling costs that are a percentage of resale. If your lender fees, interest, or acquisition costs depend on the offer amount, update those costs and recalculate.
A flat percentage of after-repair value can hide the individual assumptions. An itemized budget makes it easier to see whether the constraint is the price, the renovation, financing, or time. Your target profit is a choice for the project, not an industry-wide guarantee or a substitute for cash planning.
Build the budget before choosing the offer
Support the expected resale price
Use comparable evidence that reflects the finished property and a realistic sale period. Keep asking prices separate from verified sale prices. Our guide to asking prices and sold comps explains what each record can tell you.
Include the full renovation and transaction costs
Budget the scope, permits, a contingency, acquisition expenses, and estimated selling expenses. Record what each quote includes. A contingency for unknown work should remain a cost allowance; it should not also appear as available profit.
Budget through resale closing
The holding period covers renovation, marketing, the buyer’s transaction, and closing. Include property taxes, insurance, utilities, maintenance, and applicable HOA costs. Put loan interest and lender fees in financing, and count the loan-funded portion of the purchase price only once.
Choose and label your target
A dollar-profit target, return on total costs, and cash-on-cash return answer different questions. This example uses a dollar target. A model that targets a percentage return needs a formula consistent with that return’s denominator.
A cost-based maximum offer example
These are invented planning inputs, not market averages or a real property recommendation. They use the same cost structure as the Maison house flipping calculator, with a chosen $75,000 profit target.
| Budget item | Amount |
|---|---|
| Expected resale price | $675,000 |
| Less selling costs (6% of resale) | $40,500 |
| Less rehab, permits, and contingency | $65,000 |
| Less buying costs | $8,000 |
| Less holding costs (6 months) | $10,800 |
| Less total financing interest and fees | $15,000 |
| Less target profit before income taxes | $75,000 |
| Calculated purchase-price ceiling | $460,700 |
Buying at $460,700 gives total modeled costs of $600,000 and leaves $75,000 at the assumed resale price. That verifies the result by putting the offer back into the profit calculation.
The calculator starts at a $450,000 purchase price, which leaves $85,700 under the original inputs. Change its purchase price to $460,700 to reproduce the target-profit example.
See what reduces the offer ceiling
Each row below keeps the same $75,000 target profit. The extra financing amount is an explicit example assumption; it is not calculated from a loan rate.
| Scenario | Purchase-price ceiling |
|---|---|
| Original exampleAll example inputs unchanged | $460,700 |
| Resale price 5% lower$641,250 resale; selling costs still 6% | $428,975 |
| Rehab costs $15,000 more$80,000 rehab; all other inputs unchanged | $445,700 |
| Three extra months9 months of holding costs and an assumed $6,000 in extra financing costs | $449,300 |
| All three changes togetherLower resale, higher rehab, and the longer hold above | $402,575 |
A lower resale price reduces proceeds, while a longer hold adds costs. Test them together as well as separately. If the resulting ceiling is negative, those assumptions cannot meet the target even at a zero purchase price; revise the plan rather than treating it as a valid offer.
Use the ceiling as one input to a decision
An offer still depends on your financing, available cash, property condition, and verified evidence. A positive modeled profit does not show that you can fund every payment along the way. Confirm your loan terms and cash needs separately, and revisit the inputs when inspection findings or quotes change.
See the sample Maison report for how assumptions and evidence can be presented together. For a California property, the California cost guide identifies local questions to add to your budget.