Negative Equity Calculator
By how much you owe more than the property is worth.
Calculate whether a property is in negative equity and the size of the shortfall between mortgage balance and market value.
What this tool does
Enter mortgage balance and current property value. The tool shows whether the property is in negative equity and the shortfall amount.
Enter Values
Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Negative equity means the mortgage balance exceeds the property's current value. It becomes a real problem when you want to sell — the sale does not clear the loan, so the shortfall has to be covered another way. A 220,000 balance on a 200,000 property is 20,000 of negative equity. Negative equity does not matter much if you are staying put and paying down the loan; it matters a lot if it helps to move.
Run it with sensible defaults
Using mortgage balance of 220,000, property value of 200,000, the calculation works out to 20,000.00. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Mortgage Balance and Property Value — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.
How the math works
Straight subtraction. Shortfall is the gap between what you owe and what the property would sell. Ignores selling costs. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".
Why this matters before you sign
A mortgage is usually the biggest single financial commitment a person makes. The difference between a well-chosen product and a hasty one can run into tens of thousands over the life of the loan. Running the numbers here before committing is the cheapest form of due diligence available.
What this doesn't capture
The figure excludes arrangement fees, valuation costs, legal fees, insurance, and any early-repayment charges — those can add several thousand to the headline cost. Rate changes at renewal for fixed-term deals will shift the picture further. Use this for the core interest/principal math and add the other costs on top.
Negative equity produces a shortfall figure based on the inputs provided.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Straight subtraction. Shortfall is the gap between what you owe and what the property would sell. Ignores selling costs.
References
Frequently Asked Questions
How do people end up in negative equity?
Can I sell if in negative equity?
Does paying down the mortgage help?
Does negative equity prevent remortgaging?
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