After deplaning from your flight at Philip Goldson International Airport just proceed to customs. More often than not, a customs officer will open your bags, or ask you to do so.
Personal effects can be brought in without difficulty.
A departure tax of $20.00 US is charged when leaving Belize (but not
for intransit passengers who have spent less than 24 hours in the
country); this must be paid in cash or travellers' checks (credit cards
not accepted for departure tax). Further, travellers entering Belize
International by air and connecting to in-country flights are charged a
$.75 US security fee. When crossing the Western border between Belize
and Guatemala for visits to Tikal and Flores
there is a $3.50 charge to depart Belize (but this figure is then
deducted from the departure tax when finally leaving from Belize from
the International Airport). The visa charge to enter Guatemala at the Western Border is $5.00.
For further information on customs click the links below