Withholding tax

My company was paid for work in Taiwan minus 20% withholding tax in 2020. In 2022 following my retrospective application for a reduction in withholding tax the amount was revised to 3% and my company was given a refund. I claimed double taxation relief in 2020 to cover as far as possible this withholding tax paid in Taiwan. But now most of the money for which I claimed double taxation relief has been returned to me I am wondering what is the way to account for it?

Hi Paul Williams,

If you need to tell HMRC that you have made an excessive claim in a CT600 where the time limit to amend the CT600 has expired, you will need to follow
our guidance under "Voluntary Dislosure".
This can be found at How to make a voluntary disclosure to HMRC

Thank you.

The change to my CT return would be to reduce the calculated corporation tax owed and increase (by the same amount) the double taxation relief claimed. In this case would I be expected to make a voluntary disclosure as there is no tax owed as it is all covered by the double taxation relief claimed?

Hi
Your question suggests errors have been identified within a company tax return that is out of time to amend.  
It also suggests the corporation tax liability has increased and not reduced as otherwise there would be nothing available against which to claim double taxation relief.  
An amended return can be submitted if you are in time to do so.  
If not, please write to
HMRC,
Corporation Tax Services,
BX9 1AX,
setting out the adjustments together with an amended computation with a detailed calculation of double taxation relief including details of any underlying tax relief claims.  
Please note, we may ask for evidence of the foreign tax paid as set out in
UK residents with foreign income or gains: claims for double taxation relief against UK tax: evidence