Example for interest rates: Credit risk and intrabank/central bank rates are considered by courts when judging whether a rate is “too high”.
Swedish tax authority guidelines from past cases
https://www4.skatteverket.se/rattsligvagledning/edition/2019...
Summary - interest rates should be based on market conditions and credit risk
- internal loans should not use significantly higher (or lower) than loans between independent parties.
So: the authority already makes a judgment of e.g credit risk. If the tax authority thinks the interest rate was too high, they will say what would have been reasonable - and the company will be taxed for the increased profit as a result of the lower interest rate.
I don’t see anything controversial about this and I assume this is how tax law is interpreted and enforced globally.
It should be noted that such cases are usually lost by the authority - that is, the courts do usually not find the tax authority could prove that the interest rate wasn’t a normal rate based on market rates and risk. I don’t think that’s a problem, but I think it’s important that this is how it works.