The tax-deferred and the tax-free categories carry significant tax-reduction benefits, which frequently make these two sorts of accounts a more appealing place to hold retirement investments.

FORBES: Expert View

The new streamlining agreement doesn't dictate sales tax rates or tell states what categories to tax--for example, whether they should tax clothing.

FORBES: Tax Time For Amazon?

Portugal has increased its value added tax by 1 percentage point across all categories, while increasing the top marginal tax rate by 1.5% on top earners and by 2.5% on corporations.

FORBES: Greece And The Crisis Of The Governing Elite

The seven categories it studies include tax policy and administration, tariff and other barriers to trade, regulatory reform and education.

ECONOMIST: Corruption

The problem with setting a higher compulsory level of saving is that it would be unpopular - many would see it as a tax - and inappropriate for certain categories of people.

BBC: A pensioner at a post office

As I noted here last week, federal judges have a tendency to go easy on tax cheats, granting them below guideline sentences far more often than most other categories of offenders.

FORBES: Judge Cuts UBS Tax Cheat A Break

His only gestures in the direction of fiscal responsibility were to propose reforming corporate tax, increasing some taxes on the very rich and extending a freeze on some categories of discretionary spending, all of them tiny parts of the overall picture.

ECONOMIST: The state of the union

These categories have different requirements, and a few impose stricter rules if organizations want to claim tax-exempt status.

WSJ: Review & Outlook: A Tax-Exempt IRS Primer