Ketan, I appreciate this might not affect you directly as it's concerned with EU>UK imports post Brexit, rather than vice versa, (and I think regardless of a deal.)
In a way, it seems to put UK buyers, from EU vendors, in a similar position to your EU customers.
If I've got my head round this correctly, the UK (and I think the EU) are removing the VAT exemption for low value imports.
At the moment in the UK, the VAT and any duties are collected by the carrier, and are due before final delivery; hence Royal Mail etc, leaving a card at the destination address detailing fees to be paid, and their admin charge for that fee collection. (Currently as we are within the EU, so long as VAT is collected at source at the appropriate rate for the vendor's country it's all OK)
When the rules change, VAT is to be collected by the vendor (if commercial, as opposed to a private sale), and must be paid to HMRC directly by the vendor.
In order to make this payment, the EU vendor must create an account with HMRC, for which they are charged a fee.
I believe this applies to non UK landed goods.
There are various press reports about this, but many are behind paywalls; This one explains the gist, and refers to some Star Trek items which is what caught my attention originally in The Times. (Paywall)
https://toyworldmag.co.uk/post-brexit-vat-rules-set-to-cause-significant-impact-on-trading/
https://www.thetimes.co.uk/article/its-vat-jim-but-not-as-we-know-it-william-shatner-laments-post-brexit-rules-5t26rdd6k
Freight forwarders ebay etc. seem to be able to collect the VAT on behalf of the EU vendor, and pay to their HMRC account.
This document seems to go some way towards explaining the situation, see para "How will the operation of VAT change after Brexit?" et seq.
https://www.instituteforgovernment.org.uk/explainers/tax-brexit
A small vendor may well feel that it's too expensive, or too much hassle, and thus not register with HMRC and so not be able to export into the UK.
An example came up on another thread on here where someone was pointed to an EU seller of some collets which aren't common in the UK.
If that vendor doesn't register with the HMRC, they won't be able to export here directly.
Indeed, when I looked at their website, I got a warning flag stating delivery only to EU (along with a couple of other countries, Suisse and Koweit sic.)
https://www.georgessavoie.com/en/store/collets-zugspannzangen-2/product-1.html
[Similarly, if you look at Stefan Gotteswinter's site, he doesn't currently export his precision stones to the UK.
I think this was due to the previous deadlines before the implementation of the withdrawal agreement]
Bill
Edited By peak4 on 10/12/2020 22:35:23
Edited By peak4 on 10/12/2020 22:36:58