One of the big problems selling on Amazon and other American web publishers, is getting your hands on the 30% of your royalties withheld for tax purposes. If you are not a resident American author, and your country has a Tax Treaty with the US exempting you from withholding tax, you may apply for an exemption.
Have a read of this thread on the Amazon DTP forum to see the problems:
http://forums.digitaltextplatform.co...art=0&tstart=0
Another facet is that if you earn any money at all on Amazon or other American web publishers, and you don't have a withholding tax exemption, you MUST file a US Income tax return. If you don't, you are breaking US Law, and while the IRS may not knock on your door in a non-US country, heaven help you if you ever set foot on US soil anywhere in the world because you may be arrested as a tax dodger and end up in jail.
The IRS will get your 30% withholding tax, whether you file a return or not, and the only way to get your money back is to file a US Tax Return and claim a refund. Even if you blow it off, and let the IRS keep your withholding tax money, you MUST still file a US Tax Return or face the consequences. Oh, and if you do file a US Tax Return, the IRS will bury you in red-tape and you will end up paying US tax, as well as your home country tax, on your earnings. Isn't that nice?
Just another reason to sell on your own website.
Tony