Assessment independence: higher income shown for one year does not justify enhancing assessments for other years

Higher income shown for assessment year 1986-87 due to tax-rate changes will not automatically lead to enquiries or enhanced assessments for other years; assessments are year-specific and based on that year's return and books of account, with departures permitted only when books are absent, accounting methods are irregular, or accounts are defective so correct income cannot be determined.

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