Per the data in the 2018 budget, the internal revenue, customs and excise, and value added tax sum to GY$151,086.2 M. The number shown in the budget is GY$151,745.5 M a difference of GY$659 M. Wonder if there was a typo somewhere. The calculations should have been done in a spreadsheet so it is strange this error occurred.
Someone in Guyana Parliament needs to verify the correct number.