143(1)

It's not a bad notice, it's a good notice.

It's a written acknowledgement/receipt of your tax paid. It seems everyone has got this receipt today. 

Well, not a notice..... but intimation that your filed ITR has been accepted by department, without any change!!

Isn't it necessary to get a receipt of tax paid? What happens when you pay money to anyone? you take receipt. It's the same thing.

143(1) means "no problem"

143(9) means "problem" 

Even I received this today. I was waiting for it since months. Mine says "4 rupees pending" :D 

As per rules, if less than 100rs is pending then no need to take any action. Now we can safely pay next year's tax. This year's tax is clear.