Is the GST I pay on supplies an expense or do I get it back

If you are registered for GST/HST, the tax you pay on business purchases generally is not a plain cost: you get it back. It is recovered as an input tax credit (ITC), which is a different thing from an expense.

Here is the mechanism. On your GST/HST return you take the tax you collected on sales, subtract the tax you paid on business purchases (your ITCs), and the difference is your net tax. Collect more than you paid, and you remit the difference; pay more than you collected, and you are generally owed money back.

So the GST/HST portion of a purchase does not sit in your expenses: it flows to the tax side and reduces what you owe. Only the pre-tax amount is the real expense. TALISK_HQ splits this for you when it records a bill, so the recoverable tax lands in your GST accounts rather than inflating the cost.

The common mix-up

Treating the whole tax-included amount as an expense both overstates your costs and quietly forgets money you can claim back.

Where it gets specific to you

ITCs are only claimable to the extent a purchase is for your commercial activities, and some costs are restricted or only partly eligible. Which of your purchases qualify, and for how much, is your accountant's read. TALISK_HQ tracks the tax cleanly; the eligibility call is theirs.