The IRS just came out with its annual “Dirty Dozen” list of tax scams. It is a useful rundown of current ways for taxpayers to create enormous trouble for themselves. While useful, it’s incomplete. It only looks at scams used by taxpayers. Hence, the Dirty Dozen Tax Policy Scams — in reverse order Letterman-style.

12. State non-conformity to federal rules – The federal tax law is complicated enough. When you have to start over in order to compute your state taxes, that’s a recipe for stupid. When you have to file in multiple states, it’s just crazy. California, the nation’s leader in bad ideas, has led the way ttp://www.rothcpa.com/archives/005787.php”>the bandwagon is getting crowded.

11. Asinine feel-good tax breaks – These are stupid tax rules passed to show us just how caring our legislators are. The bill allowing 2009 deductions for 2010 Haiti relief donations is a classic of the genre – it will cause countless people to double up on the charitable deductions, cause state tax return errors, and might well screw up return processing, all without actually helping Haiti.

10. Heads they win, tails you lose provisions – Sometimes the tax laws are designed to screw you. Gamblers are popular screw-ees. The federal tax law taxes gambling winnings above the line, but allows deductions only “below the line,” as itemized deductions, and then only to the extent of winning. If you don’t itemize, you lose. If you don’t have meticulous records, you lose on audit. And in some states, you just plain lose – you are taxed on winning bets, and losses are ignored.

9. Bait and switch tax treats – The alternative minimum tax has made this popular. They enact a politically popular tax break – say, home equity loan deductions – and they disallow it for AMT. So it’s there, but it’s useless.

8. Using the tax law to micromanage your life – Soda taxes. Insulation tax credits. Tax breaks for riding bikes to work. Will anybody ride a bike to work in Des Moines in February because of a $25 tax break? The tax law is full of… this sort of thing.

7. Issuing assessments based on pretend numbers – This has become popular among the states, and at least one academic thinks it should become a national policy.

6. Economic Development Credits – Where the state economic development geniuses take your money to lure and subsidize your competitors. It’s like taking your wife’s purse to the bar to finance your pick-up efforts – the girls aren’t impressed.

5. Film tax credits – If there is a stupider approach to economic development than throwing money at Hollywood, at least this side of North Korea, it must be bipartisan.

4. Sitting on your tax refunds – The states have spent so much of your money that they don’t want to pay what they owe you. When they pay their public employees before they pay what they owe you, it shows where you rank.

3. AGI-based deduction and credit phaseouts – Almost every moronic new piddly tax break goes away as adjusted gross income goes up, whimsically embedding marginal rate spikes all over the tax code.

2. Shooting Jaywalkers – Sometimes the tax law has horrible penalties for trivial, but politically convenient, violations. The 50% of your bank balance FBAR penalty, the $10,000 automatic penalty for late international form reporting, and the insane Section 409A penalties for deferred compensation foot-faults are the kind of penalties that are almost perfectly designed to hammer honesty and reward sneakiness.

1. Expiring provisions – This cynical game enacts popular provisions (see AMT patch and research credit) one year at a time, so that the budgeters don’t have to count the real 5-year cost. The congresscritters, of course, have no intention of letting these things expire, and they often enact foolish permanent tax changes to fund another temporary extension.

Sadly, there’s one key difference between tax policy scams and the Dirty Dozen Tax Scams. You can go to jail if you use a Dirty Dozen Tax Scam, but if you use a dirty dozen tax policy scam, you just stay in Congress forever and ever, amen.