Hi there. Nice to meet you. I'm Editor and co-founder of This Freelancer Life, a soon-to-be-launching magazine for freelancers, by freelancers. How long have you been freelancing for?

Hi Nitim,
I've had several problems with this. I would, in the future, build in a percentage for late invoices into your contract. That will help for the future, but not necessarily the present situation if the client is overdue. Withhold any future deliverables from him until he pays. Claims court is an option, but as a last resort unless you can claim financial hardship and get legal fees waived.