Why would it be difficult and why do I need to justify? There is no rule that one can't spend 1cr or 10 cr as long as you are filing commiserate income tax. No one has ever asked for any justification and most likely no one ever will.That means your expense crossed ₹1 cr. If your expense doesn't match your income profile, it will be very difficult for you to justify the credit card bill payments. If someone thinks that expenses are meant for others and payments are made by others, it should be kept in mind that in that case purcahses by credit card may be treated for business purpose and the IT authorities may examine if business income/turnover has been shown in the ITR.