I flew with a copilot recently who had was in his 2nd year in FR (UK) and had absolutely milked the backside out of the taxation system and was claiming back all his type rating costs, accommodation, mileage etc through his "Company". Wether he was full of bs but he said had been pocketing about £9K a month including his sector pay.
He now wants a permanent contract because he has run out of the big ticket items to claim against tax.
Only complaint he would like to be doing a few more hours but he wasnt claiming poverty. Maybe he just had a good accountant!!!!
Ps as a premanent Capt in FR you are given a £5K per annum Pilots Allowance to cover medical, loss of licence, sim hotac, etc