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Tax Information is important factor to Google Adsense

Go to your adsense account > manage ads > settings

there you will find Tax Information to fill out

Tax information is really need to persons who are in USA..but from others countries need to fill out the form

You Want to know What is Channel ?

Channels enable you to view detailed reporting about the performance of specific pages and ad units

Channels are the important facot on adsense because it tracks down the google ads that is clicked from where (ip address) and other important as optimizing with the Search engines..There were few important Channels that you need to know

Ad Type Channels (is it adlinks, search, adblock) and always defining size and kind of the ad IE: "adlinks 4 ads 728x15"

Language Channels (to track what users are making you earn money) IE: "spanish", "french"

Position Channels (where is the ad positioned on page) IE: "top", "left column", "bottom"

URL Channels (what page is paying) IE: "mydomain.com/home", "mydomain.com/product1.asp"

Color Schema Ad Channels (what color palette are ads using, you can put palette's name or description) IE: "contrast, red", "mypalette1", "site similar look and feel"

Visitor Type Channels: Loyal users, new users

Ad Size Channels, to define the various sizes of ads and see which works best

It is necessary to provide adsense with your "tax" information because if you make over a certain amount of adsense money - something like $400 - $600 now I think - you may have to pay taxes on it!

If you make a certain amount of adsense money then adsense HAS to report it! Which means that you BETTER report it or the IRS is gonna come after you!

You have to pay taxes on the money you earn just like everyone else.

If you are an individual then your "tax" information is your social security number which you have to provide BEFORE adsense will pay you any money!

Channels are ways that you can track which of your sites / ads are earning money. Say you have 2 sites with adsense ads on it and you give each site a "channel" name - that way you can track which sites are earning how much money.

you can see my site,i set google ads in several position,

by setting channel, you can get the detail about every positions stat individually.so that you can know which position is niche.

impressions, clicks, ctr, revenue. every data clearly.