Suppose a foreign trade company gives you an agency fee of 1% (calculated by the amount of foreign exchange received in US dollars) \x0d\ US dollar exchange rate of 6.25, and your product tax rebate rate is 17%\x0d\ your maximum invoiced amount = (6.25-6.25 *1%) * (. X0d\ \x0d\ The formula is as follows: \x0d\ \ Profit = USD income+tax refund-payment for factory goods-expenses \x0d\x0d\ We assume that profit is expressed by L, USD income is expressed by W, tax refund is expressed by T \ x0d \ factory goods including tax are expressed by C, expenses are expressed by S, and tax refund rate is expressed by S. (Suppose it is the most common case of 17% VAT invoice) \x0d\ x0d \ Then we can draw the following conclusions: l = w * h+t-c-p \ Because foreign trade companies think that they can't generate any profits except your agency fee, or their fees are too black) \ x0d \ Then we can get it according to the tax refund formula \. Move the formula containing c \ x0d \ w * h-p = c (1-s/1.17) \ x0d \ to get wh (1-0.0/) = c. Get: c/w = h (1-0.01) * (1+17%)/(1+17%-s) \ x0d \ Theoretically, the invoiced figure of your factory is equal to the foreign exchange purchase price of USD *( 1- agency rate) ×( 1+ VAT rate) /( 1+ VAT rate-tax refund rate) \x0d\\x0d\ The derivation is completed. You put the numbers in and do the calculation. I hope it helps you.