Do I need to pay taxes in the customer's country (withholding tax) when leaving the place?

Question

Freelance

Hello!
As an individual entrepreneur on the simplified tax system without employees, I provide services in the field of software development - all customers are foreign. When working remotely - everything is clear, I paid 6% to the budget of the Russian Federation from the turnover - and that's all - I don't owe anything in the customer's country. The origin of the service (service) is Russian. I produced a service (service) in Russia and sold it to a foreign customer.
But the question is more complicated - if the work is on site - to the country of the customer. If I sign a contract for consulting, setting up, site inspection or training on site - in the country of the customer, do I fall under the withholding tax? And who should pay it? Customer for me or me? And then register with the tax office of each country where you went on a consulting visit?
For example, countries are interested - Mongolia, Kazakhstan, Kyrgyzstan - everywhere there is a so-called withholding tax and it applies to services.
For example, Mongolia:
A 20 percent withholding tax applies to the following income types derived by an economic entity not resident in Mongolia:
Income earned from sources within Mongolia from services provided, work performed directly or electronically.
Help me to understand. Thanks

Answer 1

And who should pay it? Customer for me or me? And then register with the tax authorities of each country where you went on a consulting visit.
Isn't it more correct to ask around on the forum of accountants of that very country ?

Answer 2

The fact is that no matter how you travel around the world, your IP remains in Russia and operates on the territory of the Russian Federation.
So the question here is not taxes, but whether you have the right, as a Russian IP, to carry out this or that type of activity on the territory of another country.
And here for each case with different activities and for each country there will be a completely separate story.
For example, here is a story for the Russian Federation: rosco.su/press/deyatelnost_inostrannoy_organizatsi...

Answer 3

An agreement with an individual entrepreneur, an individual entrepreneur in Russia, galoshes in Russia and a period