The Indian Revenue Service (Income Tax) – IRS (IT) – is an All India Service recruited through the UPSC Civil Services Examination (CSE). IRS (IT) officers work in the Income Tax Department under the Ministry of Finance, handling income tax assessment, collection, investigation, and policy. Unlike IAS/IPS which are generalist administrative services, IRS (IT) is a specialised financial service. Officers can progress to Commissioner of Income Tax, Chief Commissioner, and Member of the Central Board of Direct Taxes (CBDT). The service offers exposure to complex tax law, corporate finance, and economic governance.

The UPSC CSE has three stages: Prelims (objective, 200 questions in two papers – GS Paper I and CSAT, 120 minutes each, only qualifying), Mains (descriptive, 9 papers including Essay, GS I-IV, two optional papers, and language papers; total 1750 marks for merit), and Personality Test / Interview (275 marks). Allocation to IRS (IT) depends on rank in the final merit list and preference. The combined final score determines service allocation, with IRS (IT) typically allocated to rank ranges varying by year and vacancies.

While any optional subject can be chosen for UPSC CSE, subjects like Public Administration, Economics, Commerce and Accountancy, Law, and Mathematics are considered useful for IRS (IT) as they overlap with the nature of work. Commerce and Accountancy directly covers taxation, financial statements, and auditing concepts. Economics covers macroeconomic policy, fiscal policy, and public finance relevant to tax administration. Law covers income tax and indirect tax jurisprudence. Ultimately, the optional subject should be one where the candidate has genuine interest and can score well.

Newly recruited IRS (IT) officers undergo Foundation Course at LBSNAA (Lal Bahadur Shastri National Academy of Administration) followed by specialised training at National Academy of Direct Taxes (NADT) in Nagpur. Initial postings are as Assistant Commissioner of Income Tax in major cities. Officers handle tax assessment, tax investigations, search and seizure operations, and tax recovery. With experience, officers move to Deputy Commissioner, Joint Commissioner, Additional Commissioner, and Commissioner levels, handling progressively larger taxpayer bases and more complex cases.

The rank required to secure IRS (IT) varies each year based on total vacancies, number of candidates, and service preferences. Historically, IRS (IT) has been allocated in the rank range of approximately 100–350 for general category, though this varies significantly year to year. IRS (IT) is generally considered more accessible than IAS, IPS, IFS, and IRS (Customs), but more competitive than many Group A central services. Candidates should aim for a rank well within the estimated range for their preferred service allocation.