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Seller Financing Balloon Risk Calculator
Seller-finance balloons are the highest-risk feature of creative deals. If the property hasn't appreciated and rates have risen, the refi at balloon can require tens of thousands in cash just to land the loan — or force a sale. This calculator projects balloon balance, new-loan capacity at current-plus-shock rates, and the cash shortfall under base, mid, and stress scenarios.
Base-case refi shortfall
$0
Stress (+1.5%) refi shortfall
$0
Balloon balance owed
$312,236
Refi capacity (after closing)
$359,738
Projected value at balloon
$491,950
Monthly P&I on seller note
$2,377
Stressed refi P&I
$3,102
How the math works
At a 7-year balloon on $340K seller note (15% down on $400K, 7.5% rate, 30-yr am) the balance at balloon is ~$312K. If the house appreciates 3%/yr to ~$492K and refi max LTV is 75%, new-loan capacity is ~$369K minus $9K closing = $360K — comfortable, $48K cushion.
Stress test: appreciation flat at 1%/yr lifts value to only ~$429K. 70% stress LTV capacity = $300K minus $7.5K closing = $292K. Balloon balance $312K — shortfall of $20K cash required at refi. This is why SF buyers should maintain a reserve equal to 15-20% of balloon balance or lock in a refi commitment 12 months before the balloon date.
How to Use
- Enter purchase price, down payment, original seller-note rate and term, balloon years, and expected property appreciation.
- Set the current refi-market rate and a shock (+1.5% stress) scenario.
- The calculator projects property value at balloon, new-loan capacity, and cash needed at refi.
Frequently Asked Questions
Why do balloons break buyers?
Two compounding risks: property value didn't appreciate as expected AND rates rose, shrinking new-loan capacity. The buyer owes the full balloon balance regardless; if the refi comes in short, they must cover the gap in cash or lose the property in foreclosure.
How much cash reserve should I budget?
15-20% of balloon balance in liquid reserve at minimum. Rates moving up 2% reduces your refi LTV capacity about 12-15%. If your balloon is $250K and your new loan comes in at $220K, you need $30K plus closing costs at refi. Don't run a balloon deal at the edge of your cash.
Can I extend the balloon?
Sometimes. Many seller-notes include an 'extension clause' allowing the buyer to extend 1-3 years for a fee (often 0.5-1% of balance). If yours doesn't, negotiate one when you sign. Sellers usually accept it because they want cash flow, not default and foreclosure.
What if the property drops in value?
Now you're underwater AND facing a balloon. Options: re-negotiate principal with the seller (rare but possible), short-sale to a new buyer, let the property go back (deed in lieu), or ride it out if it's cash-flow positive. Value drops are the worst seller-finance failure mode; underwrite conservatively.
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