With the UK’s exit from the EU, in the event of no deal, the UK will introduce postponed accounting – the same system that is currently in place for intra-EU trade. This means that there will be no need to pay VAT at the border; the only change caused by Brexit on VAT will be on parcels valued up to and including £135.
UK Government technical notice on VAT for businesses if there's no Brexit withdrawal agreement: https://www.gov.uk/guidance/accounting-for-import-...
HMRC have provided guidance on managing your import VAT on parcels.
If you trade in goods and decide to hold stock in an EU country for supply to your EU customers, you will need to register for VAT in that country. Dependant on the country where your stock is, you may also be required to appoint a Fiscal Representative who is jointly liable for any VAT you may owe.
Do you know which country would be best suited to support your supply chain to EU customers/suppliers?
Do you have access to bank guarantees required by Fiscal Representatives?
Does your business model allow enough margin to absorb the increased costs these new processes will bring?
HMRC has published an information pack to help businesses plan ahead plan for the contingency of a ‘no deal’ EU Exit.
The pack includes guidance on how VAT could be affected and actions to take now. Information is split by topic and audience, and flowcharts: https://www.gov.uk/government/publications/partnership-pack-preparing-for-a-no-deal-eu-exit
Future editions of this pack will include information from other government departments responsible for policies that will impact trade at the border.
UK Government technical notice on VAT for businesses if there's no Brexit withdrawal agreement: http://www.gov.uk/government/publications/vat-for-businesses-if-theres-no-brexit-deal
If your business currently use the UK VAT MOSS Union scheme you can continue to use the MOSS system after 29th March, but must register for the VAT MOSS non-Union scheme in an EU member state: https://www.gov.uk/guidance/vat-it-system-rules-and-processes-if-the-uk-leaves-the-eu-without-a-deal
HMRC guidance for the future treatment of payments between associated companies in the UK and other member states that are currently exempt from deduction of tax under the Interest and Royalties Directive and the Parent Subsidiary Directive: https://www.gov.uk/guidance/changes-to-deduction-of-tax-on-interest-royalties-and-dividends-if-the-uk-leaves-the-eu-without-a-deal