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You can tell the seller that you are not prepared to purchase the land until you have proof that GST must be paid. If he agrees to show you the document the lawyer provides that should be good enough. Otherwise, he has to explain to you what he has been doing with land. The reason why is that essentially, the sale of land by an individual that has kept the land for personal use would be exempt from GST.
Here are examples of when GST might have to be paid:
You can ask but there's no way that you can demand this because you don't have any authority to do so. It wouldn't make sense to sue to get in order as it would cost more and this would be worth to you.
This reply is for your other post.
Please find it and reply there as I cannot deal with a new question on this post.
As well, please rate the answers to this post now. It's not fair to expect me to keep answering a new post when I've not been paid for this one yet.