Should 'reverse charge' be noted on Invoices from outside UK?

Is there a requirement to state that the VAT reverse charge applies on invoices for services coming from EU. We are an EU tech company now selling to UK

The "this supply subject to reverse charge, customer to account for VAT" requirement is an EU VAT rule, there is no requirement for an EU or rest of the world supplier to put any wording on their invoices to non-EU customers. You should know already that if you are a business and buy (most) services from outside the UK, the supplier will not charge VAT (place of supply is where customer is, supplier treats as outside scope of VAT) and your purchase is subject to reverse charge by default and so you would be expected to reverse charge any such service invoices by default. Some EU suppliers may retain the special wording as a template on all their invoices regardless of where the invoice is going to but to answer your question, there is no legal requirement to add the special wording where the customer/recipient is not an EU based business. There is also no requirement for a UK supplier to issue an invoice with any special wording to any EU or rest of world business customer, but the wording is helpful as it tells the recipient they have to do something, so whether there is a legal requirement or not, I tend to advise my clients to put some form of reminder/wording on the invoice so as to help their customer, purely as a convenience for the customer (and it also helps during a HMRC inspection as HMRC may ask why certain sales are not subject to VAT and some sort of wording will at least explain to HMRC why).

Hi.
You would need to contact your the member state where you are VAT registered to confirning the correct invoicing arrangements.
Thank you.