State Bank of India is not just any bank — it is the longest continuously operating banking institution in India and the country's largest commercial bank by assets, deposits, branches, and employees. When you walk into the SBI Clerk exam, GA questions on SBI history are almost certain to appear, and they tend to be specific: a year here, a chairman's name there, an associate bank's identity.
Here is the core idea you need to internalize before reading the detailed timeline: SBI did not spring into existence fully formed. It is the product of three distinct evolutionary phases — colonial-era presidency banks merging into the Imperial Bank of India, the Imperial Bank being nationalized into SBI in 1955, and then SBI absorbing its associate banks across decades before the grand consolidation of 2017.
Think of it like this: SBI is a river formed by three tributary streams. The first stream is the three Presidency Banks of Bengal, Bombay, and Madras — each created by colonial administration to handle government treasury business. The second stream is the Imperial Bank era (1921–1955), where those three banks merged into one. The third stream is the SBI era itself, which began July 1, 1955, and has continued expanding ever since.
The analogy is useful because exam questions almost always test one of the three transition points: (a) when one era ended and the next began, (b) who was in charge at that moment, or (c) what the scale was at the time of transition — for example, how many branches Imperial Bank had when it became SBI. Keep those three transition points at the front of your mind as you work through this chapter.
The story starts in 1806 with the Bank of Calcutta, founded by the Government of Bengal. It was India's first joint-stock bank, set up to serve as banker to the provincial government. In 1809 it was reconstituted and renamed the Bank of Bengal. Two more followed: the Bank of Bombay (1840) and the Bank of Madras (1843). These three are collectively called the Presidency Banks, and they operated separately for nearly eight decades.
Key anchor fact: The Bank of Calcutta was founded in 1806 by the Government of Bengal — not by the East India Company directly, not by a private merchant. Examiners love testing this distinction.
On January 27, 1921, the three Presidency Banks were amalgamated to form the Imperial Bank of India through the Imperial Bank of India Act, 1920. This was the first large-scale bank consolidation in Indian history.
Imperial Bank functioned as both a commercial bank and a quasi-central bank — it held government balances and managed currency chests — until RBI was established in 1935, after which RBI took over those central banking functions. By 1955, when the transformation happened, Imperial Bank had 480 branches across the country.
On July 1, 1955, the Imperial Bank of India was nationalized through the State Bank of India Act, 1955, and renamed the State Bank of India. The Reserve Bank of India acquired a controlling interest. The primary purpose was developmental — to push banking services into rural and semi-urban areas that private banking had not reached.
A. D. Shroff became the first Chairman of SBI, serving from 1955 to 1959.
The RBI Governor at the time of SBI's formation was B. Rama Rau, who held the Governor's position from 1949 to 1957.
The State Bank of India (Subsidiary Banks) Act, 1959 created a framework for SBI to bring regional banks under its umbrella as associate banks. The first associate bank created under this framework was the State Bank of Hyderabad in 1959, formed when the erstwhile Hyderabad Bank was taken over.
Over time, eight associate banks operated alongside SBI:
| Associate Bank | Region | |---|---| | State Bank of Bikaner & Jaipur | Rajasthan | | State Bank of Hyderabad | Andhra Pradesh / Telangana | | State Bank of Mysore | Karnataka | | State Bank of Patiala | Punjab | | State Bank of Travancore | Kerala | | State Bank of Indore | Madhya Pradesh | | State Bank of Saurashtra | Gujarat | | Bharatiya Mahila Bank | Pan-India (women-focused) |
Note: State Bank of Saurashtra was merged into SBI in 2008, and State Bank of Indore in 2010 — before the grand merger. The remaining five associates plus Bharatiya Mahila Bank were all merged on April 1, 2017, in the single largest bank consolidation in Indian history.
SBI opened its first international branch in London in 1963, marking its entry into global banking. This branch was set up primarily to serve the Indian diaspora in the UK and to facilitate trade finance.
The April 1, 2017 merger pushed SBI into the ranks of the world's largest banks by asset size. After the merger, SBI's branch count crossed 24,000 and its customer base crossed 500 million. This single event is the most-tested "recent history" milestone in SBI Clerk GA sections.
Three critical years follow a pattern: 1806 (Bank of Calcutta founded), 1921 (Imperial Bank formed), 1955 (SBI formed). The gaps are 115 years and 34 years. If you remember the chain as "Bengal 1806 → Imperial 1921 → SBI 1955", you anchor all three transition years in one mental string. Any question asking "in which year was X formed" falls into this chain. Standard recall without this chain: ~20 seconds of searching memory. With the chain: under 5 seconds.
A. D. Shroff was SBI's first Chairman. Remember: SHroff → SHuruat (शुरुआत = beginning in Hindi). The "SH" sound = start. If a question asks about the first chairman, the "SH" trigger immediately points you to Shroff. Eliminates confusion with later chairmen like R. K. Talwar (who was also famous but served later). Standard method: process of elimination across 4 options ~25 seconds. With trigger: under 8 seconds.
Among associate banks, remember two anchors: State Bank of Hyderabad was FIRST (1959) and the 2017 merger was LAST (the big one). Everything else — Saurashtra 2008, Indore 2010 — falls between. Questions on associate banks almost always test either the first or the big merger year. Anchoring both endpoints cuts your answer time from ~30 seconds to ~10 seconds because you don't need to recall the full list.
Imperial Bank had 480 branches when it became SBI. Lock it as "four-eighty" — not 485, not 490, not 495. The options in PYQs deliberately cluster around 480 with 5-unit increments. If you have 480 drilled as an absolute anchor, you eliminate all three distractors instantly. Step count: 1 step (recall the number) vs. 3 steps (read all options, reason through which is plausible, guess). Time saved: roughly 15 seconds.
SBI's first international branch opened in London in 1963. To remember the year: Independence was 1947, SBI formation 1955, London branch 1963 — gaps of 8 years each. The "every 8 years" pattern between these three milestones is a quick reconstruction tool when you forget the exact year. Options in PYQs give 1962/1963/1964/1965 — the 8-year gap from 1955 points you straight to 1963. Eliminates guessing: standard ~20 seconds reduced to ~8 seconds.
When you see an SBI history question in the exam hall, run this mental decision tree in under 10 seconds:
Step 1 — What era does the question ask about?
Step 2 — What type of fact is being tested?
Step 3 — Eliminate wrong options first. Exam setters typically offer one distractor that is one step earlier and one that is one step later. If you know the correct anchor, you eliminate two or three options immediately and confirm the remaining one.
Do not overthink SBI history questions. They reward exact recall, not reasoning. Drill the anchor facts until they are instant.
Why this question: Tests the single most important "founding father" fact about SBI — the identity of the first Chairman. Examiners use it to separate prepared candidates from those who only know SBI was formed in 1955.
Solving path: Apply the "SHroff = SHuruat" trick. The question gives four names — Shroff, Sen, Talwar, Chokshi. R. K. Talwar is a famous SBI Chairman but served in the 1970s, not 1955. Lock in Shroff. Time: under 8 seconds.
Why this question: Tests SBI's international expansion milestone. The year 1963 is an anchor fact with no logical derivation — pure recall. The clustering of options (1962/1963/1964/1965) means you cannot guess from context.
Solving path: Use the 8-year gap pattern: 1955 (SBI formed) + 8 = 1963. London branch = 1963. Eliminate 1962, 1964, 1965.
Why this question: Tests a specific numerical fact about Imperial Bank's branch count at the time of the 1955 transformation. The options are deliberately tight (480/485/490/495).
Solving path: Recall the anchor: 480, not 485. The number 480 has been consistently cited as the branch count at the point of transformation. Do not second-guess — go with 480 instantly.
Why this question: Tests the 2017 associate bank merger, which is the single largest structural event in SBI's post-1955 history. Options cluster around 2015–2018 to catch candidates who remember "recent" but not the specific year.
Solving path: April 1, 2017 — financial year start date, which makes it easy to remember as "the merger that started a new financial year." Eliminate 2015, 2016, 2018.
Why this question: Tests which associate bank was the first to be created (1959). Candidates often confuse this with which was the largest or most well-known. State Bank of Hyderabad is the correct answer, not Patiala or Mysore.
Solving path: Anchor: Hyderabad was first (1959). The erstwhile Hyderabad state's bank was taken over immediately after the States Reorganisation period. If you remember "Hyderabad first, 2017 last," this question is a 5-second answer.
Confusing "nationalization" with SBI's formation. SBI was not nationalized in 1969 along with 14 other banks. It was created in 1955 by nationalizing the Imperial Bank. These are two separate events. The 1969 nationalization wave covers other banks entirely.
Attributing Bank of Calcutta's founding to the East India Company. The Bank of Calcutta was founded by the Government of Bengal, not directly by the East India Company. Exam options will include "East India Company" as a distractor.
Mixing up the first Chairman (A. D. Shroff) with R. K. Talwar. R. K. Talwar is a well-known SBI Chairman who served in the 1970s and is associated with SBI's social banking push. Shroff was first (1955–1959). Do not swap them.
Assuming all eight associate banks merged in 2017. State Bank of Saurashtra merged in 2008 and State Bank of Indore in 2010. Five associates plus Bharatiya Mahila Bank merged in 2017. If a question asks specifically about 2017, the count is six entities (five associate banks + Bharatiya Mahila Bank), not eight.
Getting the London branch year wrong under pressure. The options 1962 and 1964 are placed there precisely because candidates who vaguely remember "early 1960s" will split between those and 1963. Drill 1963 as an absolute anchor.
Forgetting the RBI Governor at SBI's formation. B. Rama Rau served as RBI Governor from 1949 to 1957, covering the 1955 formation date. Questions pairing SBI formation with RBI leadership are less common but do appear. The name "Rama Rau" sounds similar to other RBI names — do not confuse with C. D. Deshmukh (who preceded Rama Rau) or H. V. R. Iengar (who followed).