by Namrata Majithia 1st January 2018
Mod 21-RFI: Double Taxation Relief

The Portuguese tax authorities can insist Portuguese companies withhold 25% of the payment, when they paying invoices submitted by British companies who have sold them goods or services.

To avoid this retention, the Portuguese tax authorities need the Mod 21 document in order to confirm that the British company is based in the UK and pays its taxes in the UK.

If you need to provide the Mod 21 to a Portuguese company in order to get paid the full amount, pleaseĀ download the documentĀ and send it to HMRC for them to stamp, and also request a Certificate of Residence from them. The Certificate of Residence is valid for 1 year.

Send the form to:

Business Tax Operation Unit
HM Revenue and Customs

In the letter please indicate:

– Certificate of UK Tax Residence
– Unique Taxpaxer Reference (UTR)