Entered Purchase Receive Documents

Since the last few days, I have entered a total of 28 purchase receive documents for GST input tax claims from customs for the month of October and November. Since I have yet to receive the tax invoices for December which will most likely be early January, I can only key in in January 2016 and submit payment before the second week of January. Some of the figures don’t tally at all despite using Netiquette like the associate company of s hm which always has a difference of $3.60, giving out weird numbers that are totally different from Netiquette which is a cloud GST system. We have to pay $500 per year just to use Netiquette plus the services of a freelance accountant that comes to my home office to help out with the GST software and payment online.