Now comes the fun part — the part where it pays to be naughty.

You see, the second most important piece of this tax bill, after the corporate tax giveaway, is a drastic tax cut for business owners, who will end up paying much less in taxes than people with the same income who work as someone else’s employee.

It’s hard to come up with any good rationale for this move, which will discriminate among taxpayers in a way that bears no relationship to any coherent policy goal. It will, however, offer a big financial windfall to a number of elected officials, especially Donald Trump.

And it will also open the door to a lot of tax-system gaming.

The obvious trick is to keep doing exactly what you’re doing now, but redefine yourself as an independent contractor rather than an employee. The bill contains rules that would supposedly limit that kind of abuse, but tax experts have already found huge loopholes. And these experts were just a handful of people working pro bono for a couple of days. Over the months ahead, as thousands of top-dollar accountants and lawyers get to work, expect to see many more routes to tax avoidance emerge — but only for the rich and well connected.

Consider one example we already know about. Imagine a partnership involving several doctors. Under the new rules, such a service business won’t qualify for the tax break (although it would if they were architects. Why? Who knows?). But the doctors can get around the rule by buying the building they work in, then charging themselves an exorbitant rent. Voilà! They get to pay much lower taxes — because real estate investment trusts, strange to say, do get the big tax break.

Or suppose some of my colleagues form an economics consulting firm. Such a firm won’t qualify for tax breaks. But suppose they also start selling nerdy T-shirts (“Economists do it with models”). With a little hocus-pocus, as I understand it, they can basically define themselves as a T-shirt business, and pay much less in taxes.

The point is that there will be hundreds of tax-avoidance games like these, costing taxpayers billions if not hundreds of billions in lost revenue. But only those who are both affluent and sneaky will be able to play these games. As I said, Tax-Cut Santa actually rewards you if you’re naughty, as long as you’re naughty in the right way.

And what about those promises that rich people wouldn’t get a tax cut, that the tax system would get simpler, that you’d be able to file on a postcard, and all that? All I can say is, ho ho ho.