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Hi,
An income tax officer is someone who deals with income tax matters concerning the Central Board of Direct Taxes (CBDT). The CBDT is a department of the Central Government of India. Class I officers of CBDT comes from Indian Revenue Service (IRS). IRS is the administrative revenue service of the Central Civil Services of the Government of India. It is the largest Group A Central Service amongst the organised civil services in the Government of India. The service functions under the Department of Revenue in the Union Ministry of Finance and is concerned with the collection and administration of the various direct and indirect taxes accruing to the Union Government.
Class I posts in Indian Revenue Service (Direct taxes) I. e. income taxes is filled through Civil Services examinations conducted by UPSC. All type of graduates from recognised universities are eligible for appearing in Civil Services examination. The Staff Service Commission (SSC) conducts an entrance exam annually for the recruitment of candidates in the income tax department for staff required below Class I officers. The basic qualification required to apply for the SSC is a degree from a recognised University or its equal. The candidates must be at least 18 years and not more than 27 years at the time of applying (age relaxation is available for the candidates belonging to the backward classes).

Hi,
As far as advantage of being a Sales Tax consultant concerns, you need to have proper qualification which is:
1. CA/ CMA + LL.B. Preferred. It gives you good money but you really need to work hard to build rapport, learn skills and ability to negotiate well with client as well as Government authority. The Indian Revenue Service (IRS) is one of the Premier Civil Services (Group "A") of India. IRS comprises IRS (C and CE) and IRS (IT). IRS officers are concerned with the:
1. Collection
2. Administration and
3. Policy Formation of Direct and Indirect Taxes. Selection is through the Civil Services Examination conducted by Union Public Service Commission through a three-stage combined selection process. IRS Officer Trainees undergo a three month foundation training with fellow officers from All India Services and other Central Services (Group AAT Lal Bahadur National Academy of Administration (LBSNAA) followed by a 15 month rigorous professional training in NACEN Faridabad for the officers of Customs and Excise or NADT Nagpur for officers of Income Tax, where they are intensively trained in:
1. Principles.
2. Concepts and Advances in Management.
3. Taxation.
4. Public Policy and
5. Law. Alternatively, the S. C. conducts an exam every year for recruitment to the following posts:
1. Inspector of Central Excise.
2. Examiner in Custom House.
3. Preventive officer in Custom Houses.
4. Inspector of Income Tax in different charges of the commissioner of Income Tax.
5. Assistant Enforcement officers in the Directorate of Enforcement (FERA). The exam is held once a year, generally in the month of April. A candidate must have the age of 18 years and must have not attained the age of 25 years and a candidate must hold degree of a recognised university or equivalent. The minimum educational qualification is a Bachelors degree with Hindi and English as main subjects. The exam consists of a written Exam and an interview for personality Test.