How to Change VAT percentage from a sepcific Period

Hey,
I want to know as now VAT Flat rate % becomes 16.5% for most of the flat rated clients from 01 April 2017 onward so how in Quickfile i can just change the percentage from that date and it took the Sales coming in previous months on the previous Flate rate %. For Example if my VAT Quarter is April and there is only on Sale in April-17 which needs to be at 16.5% and previous ones should be charged as preivous flat rate %

You will have to manually deal with it, get calculations from QF for Feb and March on old rate, note the calculations, then change the rate to 16.5% and run the calculations for April only, add them together ,
Now you have two options,

  1. submit it through HMRC portal and mark both vat return as submitted on QF

or
2) Run April QE on new rate and use adjustment boxed to get results as per 1