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Depends on how your goverment treats cryptocurrencies. In most countries its considered a 'digital asset', meaning that you have to pay taxes if you earn it through labor (writing posts for example), and if you bought at a certain price, and sold it for a higher one (capital gains).
I advise you to consult an accountant, to make sure you're not breaking any laws by not reporting the coins you earn from your activity on STEEM.

@fr3eze

Just went through some of your posts it seems like your local gov has gave so much of troubles in the tax related stuff. No wonder you are so aware of it. By far the gov of my staying place (Malaysia & Singapore) is not very concerned how much do we make in the crypto and I'm not trading actively. But the service you are proposing is gonna be beneficial to the whole Steem community anyhow.