Manama's advisory, fintech and professional firms keep books in dinars to three decimals, prepare a 10% VAT return for the NBR and pay SIO contributions. Aqid ERP keeps the ledger to the fil, prepares the return as a working paper and runs the payroll with SIO and leaving indemnity. Nothing is filed to the NBR for you.
Muharraq holds the airport, the Hidd industrial area and Khalifa Bin Salman Port, and the logistics, aviation-services and trading companies around them. Aqid ERP keeps each warehouse's stock against the ledger, keeps export sales apart on the NBR return and runs the payroll with SIO. It has no duty-free or bonded-stock module, and says so.