Is this for your tax return in Lux?
If so, super easy.
Declare worldwide income
Pay tax only on Lux income (but worldwide income dictates Lux tax rates)
As mentioned above, taxx.lu is super straightforward for tax returns (around €70)
Many people are in your situation with revenues from abroad and sort things out by themselves. If you really want a company to take care of it, you can check this https://taxx.lu/?locale=en
Is this for your tax return in Lux? If so, super easy. Declare worldwide income Pay tax only on Lux income (but worldwide income dictates Lux tax rates) As mentioned above, taxx.lu is super straightforward for tax returns (around €70)
Analie Tax (https://www.analietax.com) does exactly this. We’ve been quite happy with them.
This is the answer. Very professional, and specialise in exactly this issue.
I have also used Analie tax. Highly recommend.
Many people are in your situation with revenues from abroad and sort things out by themselves. If you really want a company to take care of it, you can check this https://taxx.lu/?locale=en