This is somewhat off tangent, but I'm reminded that the %^#@*+& GST we have in Canada does, in fact, have one benefit.
Because a return is required every 3 months, the year end Income Tax return figures become readily available by means of a simple addition exercise.
Admittedly, you need to plan each quarterly return so you break expenses into categories that match the Income Tax entries (e.g. Advertising, Auto expenses, Office Supplies, etc), even though the GST return is interested in only the total of GST paid out on all your expenses. However, this is achieved by using a worksheet that includes the GST amount (which, especially in the case of bills paid to US suppliers, can be NIL) for each incurred expense. In turn, you can gather all the bills into a folder for each quarter, which makes them easy to find whenever you need to recall what you paid to whom.
Then, at year end you have the guts of your Income Tax return at hand. All that's needed is adjustments such as bank charges, personal auto expenses (a percentage of the four quarterly totals), and, if it applies, the business portion of home expenses.
Not the least benefit is that you don't have to remember the details of (shall we say?) a lunch chit you picked up when taking a client/prospect out to see half a dozen or so houses several months ago.
I personally hated the extra paperwork when GST came into being. Now, though, I see it as a silver lining to the bureaucratic cloud I imagined it would be.
Duncan
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Acts as an Exclusive Buyer Broker for residential and non-residential properties in Canada's Niagara Peninsula.