Unless you have done your ATPL or type rating within the last tax year, and are claiming back their costs as expenses, then you are evading taxes. As a rule of thumb, you should be paying about 30% of your earnings in tax and National Insurance Contributions. I doubt you only earned Eu4500 in a six month period.
Rubbish.
tax evasion is the general term for efforts to not pay taxes by illegal means.
It is perfectly legal and acceptable to mitigate taxation liability implimenting the rules and regulations set forth by the taxation jurisdiction applicable.
Avoiding / Not paying tax on amounts due is illegal, reducing taxation liability in accordance with the applicable laws set forth is not.
Ergo, your claim that the previous poster is evading tax by his contributions is a false accuastion of criminal activity without factual evidence support your allegation and as such, considered libel.
libel (Written, broadcast, or otherwise published words)—is the communication of a statement that makes a claim, expressly stated or implied to be factual, that may give an individual, business, product, group, government, or nation a negative image.