Understanding Wage Components Under Indian Labor Laws
The "Act" you referred to is the Minimum Wages Act, 1948, which alone fixes the quantum of wages payable to industrial employees, selectively as a first step towards the realization of the ideal of securing a "Living Wage" for the working class as per Article 43 of the Constitution of India. Though the terms 'wage', 'salary', and 'remuneration' have similarities in their colloquial meanings in terms of nature and outflow, they have certain subtle dissimilarities or differences in their literary and legal definitions in terms of the periodicity of payment, method of computation, the nature of services in consideration of which the payment is made, and the addition of certain components resulting in a structural pattern.
Apart from the MW Act, 1948, being the only Act fixing the minimum rate of wages payable in respect of certain scheduled employments, as I mentioned earlier, there are other legislations relating to wages exclusively too, such as the Payment of Wages Act, 1936, dealing with the mode and periodicity of payment of wages and the legal deductions therefrom, and the Equal Remuneration Act, 1976, mandating equal wages for equal work irrespective of sex, along with other legislations like the Industrial Disputes Act, 1947, the ESI Act, 1948, the EPF Act, 1952, the Payment of Bonus Act, 1965, and the Payment of Gratuity Act, 1972, each having its own modified definitions of wages depending upon their respective purposes.
Therefore, when you intend to break the gross or total wages of a given wage period (e.g., monthly wages) into different components such as basic and allowances, you have to ensure compliance with all these Labor Laws, which have different definitions of the same term.
Basic and Dearness Allowance being the major components invariably finding a place for consideration in almost all the legislations mentioned above, you may consider the breakup of Basic and D.A together as 70% + Other Allowances 30%. Such a practice would ensure unquestionable compliance with all enactments and avert the heartburns of employees regarding their indirect/fringe benefits.
Anyway, do not start the calculation with CTC.