CMA
13117 Points
Joined May 2009
Most of the statutes were made decades ago. So wherever the statute demands the maintenance of documents, it generally means hard copies (original and signed) only. Of late, digitization has been widely promulgated and exceptions have been introduced under some of the provisions of the law (for example, now books of accounts can be maintained electronically).
I am not aware of explicit provisions allowing soft copies of invoices as such. Am sure someone who knows about it can help in this regard.