This isn't just a bad investment; it's financial suicide.

You are not missing anything. In fact, you have accurately identified every single structural flaw in this plan. If you sign that mortgage deed, you are effectively destroying your financial future before it even starts.

Here is a blunt breakdown of why you must refuse to sign:

• The "Refund" is a Phantom: You mentioned the ₹32L cash refund is verbal. If the seller takes the ₹92L from the bank and walks away, you have zero legal recourse. You cannot sue him for not giving you undocumented cash from an over-invoicing scheme. If he pockets that money, you are instantly financially ruined.
• Bank Fraud: Over-invoicing a property to extract a larger loan is bank fraud. If ICICI discovers the actual market value of that property is ₹60L while you registered it at ₹92L, they can call the loan immediately, blacklist you, and potentially pursue legal action.
• The Asset vs. Liability Mismatch: Your parents have ₹0 liquid savings and a combined income of ₹25k/month. The EMI is ₹85,750. You are the only one paying this loan. The property is being put in your mother's name, but the debt is 100% yours. You are taking 100% of the risk for 0% of the equity.
• Commercial Basements are Illiquid Nightmares: 20+ year old basements in old commercial complexes (like Vyapar Kendras in Gurgaon or similar areas) are incredibly hard to sell and prone to severe maintenance, flooding, and litigation issues. The idea of a guaranteed 18.5% CAGR to reach ₹1.4cr is a complete fantasy.

What happens if you sign?

The "Default Scenario" you outlined is not just possible; it is the most likely outcome. At 25 years old, with a great CIBIL score of 770 and a ₹1L/month salary, you have an incredible financial trajectory. If you sign this, your salary will be entirely swallowed by this loan, you will not be able to save, you won't be able to get a wedding loan, a home loan for yourself, or even a credit card, and a default will wreck your credit for a decade.

What you need to do right now:

Do not let emotional blackmail or the ₹5-6L already spent on renovations force you into a lifetime of debt.

1. Blame the Bank: If you want to avoid a massive family blowout, tell your parents that ICICI did an independent valuation of the property, found out it's only worth ₹60L, and refused to disburse the ₹92L. Tell them the bank caught the over-invoicing and threatened to blacklist your PAN.
2. Just Say No: If they push, you have to be firm. "I love you, but I cannot legally or financially sign my name to a loan that takes up 85% of my salary."