IAS: IAS Full Form, Eligibility, Exam Pattern, Salary & Training

IAS: Full Form, Eligibility, Exam Pattern, Salary, Training & How to Become an IAS Officer

IAS (Indian Administrative Service) is the premier civil service of India and the administrative arm of the All India Services. IAS officers are recruited through the UPSC Civil Services Examination (CSE) — one of the toughest competitive exams in the world — and go on to hold key administrative posts ranging from Sub-Divisional Magistrate to Cabinet Secretary of India. To become an IAS officer, a candidate must be an Indian citizen aged 21–32 years with a bachelor’s degree and must clear the three stages of the UPSC CSE: Prelims, Mains, and Interview.

This page covers everything about IAS in one place — full form and meaning, eligibility and age limit, exam pattern and syllabus, selection process, training at LBSNAA, salary and perks, powers and responsibilities, career progression, and how IAS compares with IPS and IFS.

IAS Full Form and Meaning

IAS stands for Indian Administrative Service. It is one of the three All India Services (along with IPS and IFS), meaning IAS officers can serve both the state governments and the Government of India. Created in 1946 (as the successor to the colonial-era Indian Civil Service, ICS), the IAS forms the steel frame of India’s administrative machinery — responsible for implementing government policy, maintaining law and order, and running the district, state, and central administration.

IAS at a Glance

Particulars	Details
Full Form	Indian Administrative Service
Recruiting Body	Union Public Service Commission (UPSC)
Exam Name	Civil Services Examination (CSE)
Eligibility	Bachelor’s degree, Indian citizen
Age Limit	21–32 years (relaxation for reserved categories)
Selection Stages	Prelims → Mains → Interview
Total Vacancies (CSE 2026)	~933 across 21 services
Training Institute	Lal Bahadur Shastri National Academy of Administration (LBSNAA), Mussoorie
Starting Basic Pay	₹56,100/month (Pay Level 10)
Highest Post	Cabinet Secretary of India (₹2,50,000/month)
Cadre Allocation	Based on rank, preference, and home state/insider-outsider policy
Retirement Age	60 years

IAS Eligibility Criteria

To appear for the UPSC CSE and become eligible for IAS, a candidate must satisfy the following conditions:

1. Nationality: Must be a citizen of India. (This is mandatory for IAS, IPS, and IFS — unlike some other UPSC services which also allow certain categories of Nepalese, Bhutanese, and Tibetan-origin candidates for non-IAS/IPS/IFS posts.)

2. Educational Qualification: A bachelor’s degree from a university recognised by the UGC/Government of India, in any stream. There is no minimum percentage requirement. Final-year students may apply for Prelims but must submit proof of graduation before Mains.

3. Age Limit: Candidate must be between 21 and 32 years as on 1st August of the exam year, with the following relaxations:

Category	Upper Age Limit	Relaxation
General/EWS	32 years	—
OBC	35 years	3 years
SC/ST	37 years	5 years
PwBD (General/OBC)	42 years	10 years
PwBD (SC/ST)	42 years	10 years
Ex-servicemen	37 years	5 years
Defence personnel disabled in operations	35 years	3 years

4. Number of Attempts:

Category	Permitted Attempts
General/EWS	6
OBC	9
SC/ST	Unlimited (till upper age limit)
PwBD (General/OBC)	9
PwBD (SC/ST)	Unlimited

Note: An attempt is counted only if the candidate appears for at least one paper of the Prelims exam.

UPSC CSE Exam Pattern (for IAS)

The Civil Services Examination is conducted in three successive stages, spanning roughly 10–12 months from Prelims to final result:

Stage 1: Preliminary Examination (Objective, Screening)

Paper	Subject	Marks	Nature
Paper I	General Studies	200	Counts for merit
Paper II	CSAT (Aptitude)	200	Qualifying (33% required)

Negative marking of 1/3rd applies for each wrong answer. Roughly 12–14 times the number of vacancies are shortlisted for Mains.

Stage 2: Main Examination (Written, Descriptive)

Paper	Subject	Marks
Paper A	Indian Language (Qualifying)	300
Paper B	English (Qualifying)	300
Paper I	Essay	250
Paper II	General Studies I (History, Geography, Society)	250
Paper III	General Studies II (Polity, Governance, IR)	250
Paper IV	General Studies III (Economy, Environment, S&T, Security)	250
Paper V	General Studies IV (Ethics, Integrity, Aptitude)	250
Paper VI	Optional Subject Paper 1	250
Paper VII	Optional Subject Paper 2	250
Total (Merit)		1750

Stage 3: Personality Test (Interview)

Conducted for 275 marks, based on the candidate’s Detailed Application Form (DAF) — covering their educational background, work experience, hobbies, optional subject, and current affairs awareness. The final merit list is prepared out of 2025 marks (1750 Mains + 275 Interview).

IAS Syllabus Overview

• Prelims GS: Current events, History of India and Indian National Movement, Indian and World Geography, Indian Polity and Governance, Economic and Social Development, Environmental Ecology and Climate Change, General Science
• Prelims CSAT: Comprehension, logical reasoning, analytical ability, decision-making, basic numeracy (Class X level)
• Mains GS Papers: Cover Indian heritage and culture, governance and constitution, economic development, internal security, disaster management, and ethics in public administration
• Optional Subject: Candidates choose one optional subject from a list including Public Administration, Sociology, Geography, History, Political Science, Anthropology, and various literature/engineering subjects

Selection Process and Cadre Allocation

After clearing all three stages, candidates are allocated a service (IAS, IPS, IFS, or other Group A/B services) based on:

1. Overall rank in the final merit list
2. Service preference filled by the candidate
3. Vacancy availability in each service
4. Physical fitness and medical examination (for select services)

Cadre (state) allocation for IAS follows the insider-outsider ratio policy, under which a limited number of officers can be posted to their home state cadre, with the rest allocated to other state cadres to ensure administrative neutrality.

IAS Training: What Happens After Selection

Selected candidates undergo rigorous training before taking up their first posting:

1. Foundation Course (3 months) at LBSNAA, Mussoorie — shared with IPS, IFS, and other civil service recruits, covering constitutional values, public administration basics, and physical training.
2. Phase I Training at LBSNAA — covers law, public finance, district administration, and includes a Bharat Darshan tour across India.
3. District Training (about 1 year) — attached to a district as Assistant Collector/SDM, gaining hands-on field experience.
4. Phase II Training — a shorter module back at LBSNAA to consolidate learning before the first independent posting as SDM/Sub-Collector.

IAS Salary and Perks

IAS officers start at a basic pay of ₹56,100/month (Pay Level 10 of the 7th CPC), rising to ₹2,50,000/month for the Cabinet Secretary. Along with basic pay, officers receive Dearness Allowance (currently 60%), House Rent Allowance, Travel Allowance, an official residence, staff, vehicle, and comprehensive medical cover.

For the complete year-by-year salary breakdown, in-hand salary calculation, and perks list, see our detailed IAS Salary guide.

IAS Powers and Responsibilities

An IAS officer’s role changes significantly through their career, but broadly includes:

• District Administration: As District Magistrate/Collector, responsible for law and order, revenue collection, disaster management, and implementation of central and state schemes
• Policy Formulation: At the state secretariat or central ministries, IAS officers draft and implement policy
• Public Service Delivery: Overseeing welfare schemes, government hospitals, education departments, and infrastructure projects
• Quasi-Judicial Powers: District Magistrates hold magisterial powers under the Criminal Procedure Code (CrPC), including maintaining public order
• Inter-departmental Coordination: Senior IAS officers coordinate across multiple government departments and agencies

IAS Career Progression (Promotion Timeline)

Years of Service	Typical Post	Pay Level
0–4 years	Sub-Divisional Magistrate / Assistant Secretary	10
5–8 years	Additional District Magistrate / Deputy Secretary	11
9–12 years	District Magistrate / Joint Secretary (State)	12
13–16 years	District Magistrate / Director / Special Secretary	13
16–24 years	Divisional Commissioner / Joint Secretary (GoI)	14
25–30 years	Principal Secretary / Additional Secretary	15
30–33 years	Additional Chief Secretary	16
34–36 years	Chief Secretary / Secretary to GoI	17
37+ years	Cabinet Secretary of India	18

IAS vs IPS vs IFS: Key Differences

Parameter	IAS	IPS	IFS (Foreign Service)
Cadre Controlling Authority	Department of Personnel & Training	Ministry of Home Affairs	Ministry of External Affairs
Core Function	General administration, policy	Internal security, policing	Diplomacy, foreign relations
Entry Post	SDM / Assistant Secretary	ASP (Assistant SP)	Third Secretary in a Mission/Embassy
Training Institute	LBSNAA, Mussoorie	SVPNPA, Hyderabad	Foreign Service Institute, Delhi
Starting Basic Pay	₹56,100	₹56,100	₹56,100
Highest Post	Cabinet Secretary	Director General of Police	Foreign Secretary
State/Central Postings	Both	Both (state police + central agencies)	Primarily central (embassies abroad)

(Note: “IFS” here refers to the Indian Foreign Service; the Indian Forest Service is a separate service, sometimes abbreviated IFoS.)

How to Prepare for IAS: A Step-by-Step Roadmap

1. Verify eligibility — confirm age, education, and attempt eligibility before starting preparation
2. Choose an optional subject early — this shapes a large part of the Mains preparation strategy
3. Build NCERT + standard textbook foundation — for Prelims and Mains GS overlap
4. Develop a daily current affairs habit — newspapers, monthly compilations, and government reports
5. Practice answer writing — Mains success depends heavily on structured, concise answer writing, not just knowledge
6. Take regular test series — for both Prelims (objective) and Mains (subjective) to build exam temperament
7. Prepare for the interview — based on your DAF, hobbies, optional subject, and current affairs, closer to the final stage

Frequently Asked Questions on IAS