Intimation received under section 143(1)(a)

This discussion concerns an intimation received under section 143(1)(a) of the Income Tax Act, highlighting potential errors in the calculation of business income. Specifically, the user is seeking advice on how to address the adjustment of a firm's loss in business income when it wasn't reflected in the profit and loss account, and the addition of GST and TDS payable, which the assessee had already paid before filing their return. The user is unsure whether to file a rectification petition under section 154 or explore other remedies.