The categorizations of express consignments are:

Import: X1 Documents

X2 Low-value Non-Dutiable, DPV under TWD 2,000

X3 Low-value Dutiable, DPV TWD2,001~50,000

X4 High-value Dutiable, DPV above TWD 50,000

Export: X6 Documents

X7 Low-value, FOB under TWD50,000

X8 High-Value, FOB above TWD50,000