At an auction, the only protection you have is a number you decided on before the bidding started. This calculator works backwards from after-repair value, subtracting repairs and contingency, inherited liens and back taxes, auction fees, closing and holding costs, selling costs, your required profit and an explicit margin of safety. The result is a maximum bid, with every deduction shown line by line so you can defend it under pressure.
Read the full guide: Treasury Real Estate Auction Guide: How to Research and Set Your Max Bid
What's included
- Transparent line-by-line deduction from ARV to maximum bid
- Separate repair estimate and repair contingency percentage
- Inherited encumbrances: back taxes, liens, HOA balances, municipal violations
- Auction fees calculated as a percentage of the bid itself
- Holding period and monthly holding cost inputs
- Explicit required profit and margin of safety
- Maximum bid shown as a percentage of ARV for quick sanity checks
Why auctions punish optimism
Auction property is usually sold as-is, often without an interior inspection, sometimes with occupants still in place, and typically with no financing contingency and a short deadline for the balance. Every one of those conditions transfers risk to you. The margin of safety in this calculator is not padding — it is compensation for information you were not allowed to gather before bidding.
The costs bidders forget
Beyond the hammer price, budget for the buyer's premium or auction fee, recording and closing costs, delinquent property taxes, HOA arrears, municipal violation liens, utility balances, possession and eviction costs, insurance during the hold, and the cost of a quiet-title action if the title is clouded. Any of these can quietly consume an entire projected profit.
How to interpret your maximum bid
Read two outputs together: the dollar ceiling and the bid as a percentage of ARV. Many flippers using this structure end up in the 55–70% of ARV range once repairs and costs are real. If your calculated ceiling comes out above roughly 80% of ARV, check your repair estimate — it is probably too low. If it comes out at zero, the deal cannot support your profit and safety requirements at all.
Key formulas
Maximum Bid works backwards from ARV: ARV - Repair Estimate - Repair Contingency - Liens, Back Taxes, HOA & Violations - Acquisition Costs (auction fees + closing) - Holding Costs (months × monthly cost) - Selling Costs (% of ARV) - Required Profit - Margin of Safety (% of ARV) = MAXIMUM BID Because auction fees are a % of the bid, the calculator solves: Max Bid = Available Funds / (1 + Auction Fee %)
Worked example: $220,000 ARV with $35,000 of repairs
- ARV: $220,000
- Repairs $35,000 plus 20% contingency $7,000 = $42,000
- Encumbrances: back taxes $4,000 + liens $2,000 + HOA $1,200 + violations $800 = $8,000
- Closing costs $3,000 · holding 6 months × $900 = $5,400
- Selling costs 8% of ARV = $17,600
- Required profit $30,000 · margin of safety 5% of ARV = $11,000
- Available before auction fees: $220,000 - $42,000 - $8,000 - $3,000 - $5,400 - $17,600 - $30,000 - $11,000 = $103,000
- Auction fee 5% of bid → maximum bid = $103,000 ÷ 1.05 = $98,095
Maximum bid roughly $98,100, or about 45% of ARV — heavy repairs, inherited liens and a real safety margin all compress the ceiling.
Frequently Asked Questions
How is a maximum bid different from the 70% rule?
The 70% rule is a shortcut: 70% of ARV minus repairs. This calculator replaces the fixed 70% with your actual costs — auction fees, liens, holding, selling, profit and safety margin — which is far more accurate on distressed property with encumbrances.
Do liens survive a foreclosure or tax sale?
It depends on the state, the sale type and the lien's priority. Some junior liens are extinguished while property taxes, certain municipal liens and some federal liens can survive. Verify with a title search and local counsel before bidding.
What margin of safety should I use?
There is no universal figure. Investors bidding without interior access often use 5–10% of ARV on top of a repair contingency, and increase it for older properties, unknown condition or uncertain title.
Why does the calculator solve for auction fees?
Because a buyer's premium is charged as a percentage of the winning bid, the fee depends on the bid you are trying to find. The calculator divides available funds by (1 + fee %) so the fee is covered exactly.
Educational tool only — results are hypothetical projections from your assumptions, not financial, tax, legal or investment advice.