The UK parliament, EU Commission and the EU Parliament have all ratified the Withdrawal Agreement and the UK will technically leave the EU on Jan 31st 2020. However, there will be no change to the application of EU VAT rules until at least the end of the transition period. The transition period is due to expire on December 31st 2020 though this can be changed with the mutual agreement of the UK government and the EU Commission.
The information available from the UK government at the moment is that nothing needs to change as it seems UK leaving the EU will not affect any aspect of how VAT is collected or how the VAT system operates. As a result there is no need to release a 'brexit' version of the VAT plugin. Instead, any changes you need to make will be at the end of the transition period and at that time will affect where you send any VAT you collect.
According to the UK tax authority (HMRC) the UK will maintain the same or parallel VAT system though outside the EU VAT system. This means that at the end of the transition period, UK vendors selling to buyers in EU member states will need collect VAT as it is collected today but send collected VAT payments, as what is called under the EU VAT directive a 'non-union' vendor, to a tax authority of an EU member state.
Similarly, vendors in the 27 EU member states will continue to collect VAT from sales to UK buyers but send collected VAT from UK buyers to the UK tax authority HMRC. That is, just as UK vendors will need to register with a tax authority of an EU member state, EU vendors will need to register with the UK tax authority. So the change required appears to be procedural not technical.
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