The overdraft account of SBI is same as saving accounts. The difference is in saving accounts have 0 minimum balances but in overdraft account can have negative minimum balance equal to your house loan amount.

If you have taken a loan of 3 Million, then you can see drawing power = amount of loan certified.

The interest percentage for this account is as per the bank's home loan interest rate. Currently for SBI, it is 10%.

SBI overdraft account Advantage:

Avail Loan up to 90% of the value of your Time Deposit
Both Demand Loan and Overdraft Facility as per your need
Low interest rates bank charge interest on a daily reducing balance!!
Zero processing charges;
No prepayment penalties

Eligibility:

Customers holding SBI’s TDR/STDR / RD / including NRE/NRO/RFC and FCNR(B) Deposits can avail this loan.

Single Account Holder can also avail Overdraft against TDR and STDR online through Internet Banking platform

Amount of Loan (For Online Overdraft against Fixed Deposit)
Min: Rs 25000
Max: Rs 5 Crore

Margin : Avail loan up to 90% of your Time Deposit value
Security Lien on underlying Time Deposit