As per the CBDT clarification, TDS to be deducted on Invoice value if the tax portion(GST) is not shown seperately in the invoice. In other words, TDS shall be deducted on taxable value if the tax portion is shown seperately in the invoice.
Hence, in this case if the taxable value and GST (tax components) shown seperately, you can deduct TDS only on taxable value if that taxable value is exceeding 30,000/-.
OR
If the tax portion in the invoice is not shown seperately, then TDS shall be deducted on the invoice value if the same is exceeding 30,000/-.