Attached credit rating received from CIRSIL. Kindly acknowledge report.

3TTW3ITf iMhO+b tDBI Bank Limited ddt® arafa© : 3rlM3rr{ del, Regd. OfFice : IDBI Tower, g@t:{tzBTaaWI, @nqts, WTC Complex, CuRe Parade, CIN: L65190MH2004G01148838 @ - 400 005. Mumbai - 400 005 afanIa : (+91 22) 6655 3355 TEL.: (+91 22) 6655 3355 (+91 22) 6655 3405, 3410 (+91 22) 6655 3405, 3410 hZITSe : www.idbi.bank.in Website : www.idbi.bank.in August 21, 2026 The Manager (Listing) The Manager (Listing) BSE Ltd National Stock Exchange of India Ltd 25th Floor, Phiroze Jeejeebhoy Towers, Exchange Plaza, 5th Floor DalaI Street, Fort. Plot No. C/1, G Block Mumbai – 400 001 Bandra Kurla Complex, Bandra(E) Mumbai – 400 05 1 Dear Madam/Sir, Rating by CRISIL This is to inform that CRISIL Ratings has reaffirmed its rating on the long-term debt instruments of IDBI Bank Limited (IDBI Bank) at 'Crisil AA+(Fixed Deposits) /Crisil AA (Long-term Bonds) /Stable’ and short-term rating on certificate of deposit programme at Crisil Al+'. The detailed report is attached herewith. You are requested to kindly take the above intimation on record in terms of Regulations 30 & 51 ofSEBI (LODR) Regulations, 2015. Yours faithfblly, For IDBI Bank Ltd. Company Secretary 21/08/2026, 10:50 Rating Rationale Rating Rationale August 20, 2026 | Mumbai IDBI Bank Limited Ratings Reaffirmed Rating Action Regulator of the Name Of Instrument Rating Outstanding with Outlook instrument Infrastructure Bonds Aggregating Crisil AA/Stable (Reaffirmed) SEBI Rs.10000 Crore Fixed Deposits Crisil AA+/Stable (Reaffirmed) RBI Tier II Bonds (Under Basel III) Crisil AA/Stable (Reaffirmed) SEBI Aggregating Rs.3100 Crore Rs.5 Crore Omni Bonds Crisil AA/Stable (Reaffirmed) SEBI Rs.40000 Crore Certificate of Deposits Crisil A1+ (Reaffirmed) RBI Rs.1900 Crore Tier II Bonds (Under Withdrawn MCA Basel III) Rs.1000 Crore Omni Bonds Withdrawn MCA Note: None of the Directors on Crisil Ratings Limited’s Board are members of rating committee and thus do not participate in discussion or assignment of any ratings. The Board of Directors also does not discuss any ratings at its meetings. 1 crore = 10 million Refer to annexure for Details of Instruments & Bank Facilities Detailed Rationale Crisil Ratings has reaffirmed its ‘Crisil AA+/Crisil AA/Stable/Crisil A1+’ ratings on the debt instruments of IDBI Bank Limited (IDBI Bank). Crisil Ratings has also withdrawn its ratings on the Tier-II Bonds (under Basel III) of Rs 1,900 crore and Omni Bonds of Rs 1,000 crore on redemption and at the bank’s request. The withdrawal is in line with Crisil Ratings policy for withdrawal of ratings. The ratings continue to reflect the steady improvement in asset quality of the bank, its healthy profitability, stable and healthy deposit base, and sustenance of healthy capitalisation. Further, the ratings also continue to factor in expected support from the Life Insurance Corporation of India (LIC) and the Government of India (GoI) towards IDBI Bank till the divestment process is completed, both on an ongoing basis and in the event of distress. However, sustenance of healthy growth in advances remains monitorable. Analytical Approach Crisil Ratings has considered the standalone business and financial risk profiles of the IDBI Bank Ltd and has factored in the support that the bank is expected to receive from GoI and LIC. As on June 30, 2026, the stake of LIC is 49.24% and that of Government of India is 45.48%. Crisil Ratings will continue to closely monitor developments with respect to stake sale by GoI and LIC in the bank and its impact on the outstanding ratings of the bank and take appropriate need-based rating action thereafter. In the interim, Crisil Ratings’ outstanding ratings on IDBI Bank continue to factor in expected support from LIC and GoI towards IDBI Bank till the divestment process is completed both on an ongoing basis and in the event of distress. Key Rating Drivers - Strengths Strong capitalisation and healthy deposit profile The bank remains well-capitalised, marked by tier-I and overall capital adequacy ratio (CAR; under Basel III) of 26.4% and 26.9%, respectively, as on June 30, 2026, compared to 25.6% and 26.7%, respectively, as on March 31, 2026, and 23.5% and 25.1%, respectively, as on March 31, 2025. The bank’s networth has improved to Rs 69,711 crore as on June 30, 2026, as against 67,638 crore as on March 31, 2026, and Rs 60,251 as on March 31, 2025, backed by healthy accrual. Further, networth coverage for net non-performing assets (NPAs) was comfortable at ~164 times as on June 30, 2026. Capitalisation of the bank is expected to continue to remain strong and is expected to receive need-based support from GoI and LIC till the divestment process is completed. Total deposits for the bank stood at Rs 3,25,757 crore as on June 30, 2026, as against Rs 3,47,163 crore as on March 31, 2026, and Rs 3,10,294 crore as on March 31, 2025. The share of current account savings account (CASA) deposits was 43.64% as on June 30, 2026, which reduced from 44.59% as on March 31, 2026, and 46.56% as on March 31, 2025. While the share of CASA deposits has declined, it continues to remain higher than the banking sector average. The bank’s fixed deposit (FD) base is also granular in nature with over 50% of FDs under ticket size of Rs 1 crore as on June 30, 2026. Improving earnings profile The earnings profile of the bank has been on an improving trend. The bank reported net profit of Rs 9,513 crore and return on average total assets (RoA) of 2.2% in fiscal 2026, as against Rs 7,515 crore and 1.9%, respectively, in fiscal 2025. Further, net profit and RoA for the first quarter of fiscal 2027 stood at Rs 2,115 crore and 1.9%, respectively. file:///C:/Users/125026/Downloads/Rating Rationale.html 1/9 21/08/2026, 10:50 Rating Rationale Improvement in RoA is attributed to factors such as reduction in credit cost, as well as controlled operating expenses further supported by recoveries from written-off accounts. Credit cost (as a percentage of average total assets) stood at -0.2% for fiscal 2026, as against 0.1% for fiscal 2025. Operating expenses (as a percentage of average total assets) was stable at 2.1% (annualised) for fiscal 2026, against 2.2% for fiscal 2025. However, the core net interest margin (excluding one-time impact of income tax refunds, and interest income from NPAs and technical write-off accounts), moderated to 3.3% in fiscal 2026, from 3.7% in fiscal 2025. The marginal moderation in RoA in the first quarter of fiscal 2027 was majorly due to fall in other income (as a percentage of average total assets) to 0.9% (annualised), from 1.5% in fiscal 2026, which benefit from one-time gain from sale of investments. Crisil Ratings expects the bank’s earnings profile should sustain at healthier levels, driven by controlled credit cost. The same will continue to be monitored. Improving asset quality metrics The bank’s gross and net NPA ratios have improved consistently over the last few years and stood at 2.3% and 0.2%, respectively, as on June 30, 2026, same as on March 31, 2026, and 3.0% and 0.2%, respectively, as on March 31, 2025. Improvement in NPA is majorly due to lower slippages and write-offs. Slippages (as a percentage of opening gross advances) stood at 0.71% (annualised) in the first quarter of fiscal 2027, as against 0.76% in fiscal 2026 and 0.98% in fiscal 2025. The total SMA 1 and 2 accounts for the bank stood at Rs 2,515 crore as on June 30, 2026, around 0.95% of total gross advances. Nevertheless, asset quality remains vulnerable to macroeconomic factors and the bank’s ability to improve its asset quality while scaling up the loan book, will be monitorable. Expectation of support from GoI The current rating factors in expectation of support from LIC and GoI, both on an ongoing basis and in the event of distress. As on June 30, 2026, LIC held 49.24% stake in IDBI Bank and GoI owned 45.48%. Given that LIC is a GoI-owned entity and has supported the GoI in its recapitalisation programmes for public sector banks in the [Showing first 8,000 characters — download PDF for full document]