[tehwalrus]

I'm not sure - if you are selling "software as a service" or any other hands-off digital product to (VAT-registered or not) companies in another EU country, then I think you must bill them at their local VAT rate and (possibly) pay that rate to their government's tax collectors (assuming you're above their country's VAT-registered threshold.) I may have read it wrong, though, I'm not an accountant.

[hermitcrab]

If they are a VAT registered business, the place of supply remains that of the vendor. This hasn't changed. ( So you don't charge them VAT under EU reverse charge.)

[theallan]

Are you sure about that? My understand of it was that the place of supply depends on what is being sold and not on the VAT registration status of either party. Digital goods would have the place of supply defined by where the customer is. Services have it defined by where the seller is.

If both you and the customer are VAT registered, then you can zero rate the VAT, but the rate (if it were applied) could be different (based on what you are selling).