Oh man...

Things could have changed since I was researching a few months ago, though the basic gyst: there’s a “responsibility” to report both income and capital gains.

Trying to avoid either could equate to tax fraud.

Could be possible to bypass reporting certain sources, depending upon how one has structured their dealings. With risk, of course.

If you’ve been pulling out $20k+ from Coinbase, you’d probably wanna report, as risk of getting busted for avoidance would be higher.

If you’ve really been flying below the radar, more likely to escape without attention. But still, with risk.

In regards to Steem, there may be some room for interpretation and creativity in how to account. i.e. Steem Power may not be accountable as income until Powered Down; could SBD be accounted as worth $1, or market value at time of distribution, etc.

If trading frequently, that might constitute income. Buy and hold long-term, capital gains.

These are the basics.

I’d recommend consulting with a knowledgeable accountant and lawyer specializing in crypto tax regulation to get a clearer idea of how to best structure your reportings, as that’ll give you the best perspective on how to navigate the particulars of your individual situation... ;-)