Duty Calculations

Modified on Tue, 24 Sep at 9:59 AM

Vapour calculates the duty due following the guidance from HMRC (emphasis ours):


Unless HMRC has permitted the use of an alternative method that does not disadvantage the revenue, you must work out each constituent stage of the calculation process to a minimum of 4 decimal places.
To complete the remittance advice W5 or W5D, truncate the quantity of alcohol established at the end of the calculation process to 2 decimal places.
You should work out the amount of duty due to 2 decimal places.


This means that the following calculation is undertaken whenever duty is calculated:


LPA (Actual) = LPA rounded to the nearest 4 decimal places.


LPA (Reportable) = LPA truncated to 2 decimal places.


Duty Rate = The rate for the LPA at the specified strength as per your configured settings.


Duty Due = LPA (Reportable) x Duty Rate, truncated to 2 decimal places.



We include the figures for LPA (Actual), LPA (Reportable) and Duty Due on our reporting output to help with submitting any details to HMRC.

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