well if you're implying they're all crooks and they won't follow the rules, it really doesn't matter what system you use.
i'm talking about closing the loop holes and write-offs, just get rid of all that stuff ... simply declare income and write your % check.
i know this gets tougher when trying to nail down the cost of doing business ... but standard exclusions for reasonable amounts could be developed based on historical data. offshore tax store fronts will go the way of buggy whips.