Understanding how tax and fees work

how mach tax and fees on codecanyon i sold my items like 162
this sells and cost 9 x 18 = 162
this fees four on every item 9 x 4 = 36
162 - 36 = 126
this picture

what is this another fees
if i have item 16\$
-4.20 us tax + -5.20 fees + -4 = 13.4
my item 16 - 13.4 = 2.6

just 2.6\$ form my project ??? this tax and fees so much

• your current author fee rate = 37.5%
• US withholding tax based on your submitted tax infos = 30%
• mobile category = \$4.00 fixed buyer fee
• list price of your item = \$18.00

list price = item price + buyer fee
your gross income of a sale is the item price and based on this gross income you have to pay your author fee and US withholding tax (if a US citizen bought your item).

non-US sale:
`\$18.00 - \$4.00 = \$14.00 gross income`
`\$14.00 * 0.375 = \$5.25 author fee`
`\$14.00 - \$5.25 = \$8.75 net income`

US sale:
`\$18.00 - \$4.00 = \$14.00 gross income`
`\$14.00 * 0.375 = \$5.25 author fee`
`\$14.00 * 0.30 = \$4.20 withholding tax`
`\$14.00 - \$5.25 - \$4.20 = \$4.55 net income`

if you have an item with list price = \$16.00 in same category

non-US sale:
`\$16.00 - \$4.00 = \$12.00 gross income`
`\$12.00 * 0.375 = \$4.50 author fee`
`\$12.00 - \$4.50 = \$7.50 net income`

US sale:
`\$16.00 - \$4.00 = \$12.00 gross income`
`\$12.00 * 0.375 = \$4.50 author fee`
`\$12.00 * 0.30 = \$3.60 withholding tax`
`\$12.00 - \$4.50 - \$3.60 = \$3.90 net income`

thank you but there is no way to make the tax and fees more less

the author fee decreases with the amount of sales

thank you