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My thought,,, is that you are a business and costs are counted, effectively as soon as you make the decision to aim to start a business.
It doesn’t matter to my mind that you are not making a profit or even an income, it’s all in the mind set. An accountant may say otherwise, but their job is to preach caution. In years past I had run a small part time business that didn’t often show a profit on paper, but as far as I was concerned it was a business. Not a hobby! And so I claimed it as such.