why my earnings is less than half of my sales income?

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Check out this article on Author Driven pricing…

Author Driven Pricing: ThemeForest, CodeCanyon and 3DOcean

Hi everyone, As many of you know, over the past 12 months we have been rolling out Author Driven Pricing (ADP) across a range of different categories, so far this has included GraphicRiver and a handful of categories within ThemeForest. Naturally, these changes are significant, and our team has been closely monitoring the impact on the market for any signs of destabilization. At this stage, I can announce that following the implementation of ADP on our early categories, the marketplace remain…

And this one on withholding tax…

http://inside.envato.com/usa-tax-withdrawal-changes/

Long story short… 3DOcean files now have a fixed buyers fee and you can set the item price. The fixed buyers fee might be more than it was previously using the straight 20% calculation, which would result in you getting less than you used to. Head to the ‘edit’ page of one of your items to see what it is and/or change the price.

And… it sounds like you may be having tax withheld, so you you’ll need to submit a W8 form in your settings page, which might reduce or eliminate that. Your statement page will show how munch tax is being withheld on your sales, if any.