What is the right time to put Defamation case against 498a

You may file it at once. but your time limit will be upto the finalising of the case, where you proved that the complaint is false.it will take time. therefore after receiving court notice you can start a defamation case. defamation case are two types (1) civil (2) criminal - sec 499 & 500..

If they gave false information to the court then you may highlight it by the petition contempt of court. for further information may please contact.

Thanks Arup Kumar for your reply..need one clarification court notice means? after the judgement of case 498a?

until and unless 498 -A case is decided on merits, one cannnot say whether, the complaint is false and vexatious or not.  After the acquittal from the 498-A case, one can definetly lodge case claiming damages for malacious prosecution and defamation. 

here 'after the court notice' means ,after receivung the charge sheet, if the party is confifdent that defamation is there, and they did it delebatly then after reciving the charge sheet, the party may start dffamation case. the charge sheet is the proove of defamation. but the defamation should be very clear like a daylight. otherwise it will be rejected.

to give false information to a police officer on duty, is also liable for penal action under IPC.

 It is said that 498A case is false and yet HC gives directions to file FIR against husband's family. Just by saying that it is false does not mean anything. You have to prove it in court in your defence.

Secondly, on ground will you find defamation suit? 

false criminal complain will be the ground for defamation.

 But unless the matter is decided by the court, how does it become false?

How can one start the case just after getting the chargesheet only ? I mean without the completion of trial of the case ?