To answer my own question, I took a look at UEFA's website. I think the following extract is interesting and it would seem to suggest that it's going to be close-run. Have Rangers lost more than €30M over the last 3 years? Would they be allowed to discount the running costs of Murray Park?
3) Are clubs no longer allowed to have losses?
To be exact, clubs can spend up to €5million more than they earn per assessment period (three years). However it can exceed this level to a certain limit, if it is entirely covered by a direct contribution/payment from the club owner(s) or a related party. This prevents the build-up of unsustainable debt.
The limits are:
• €45m for assessment periods 2013/14 and 2014/15
• €30m for assessment periods 2015/16, 2016/17 and 2017/18
In order to promote investment in stadiums, training facilities, youth development and women’s football (from 2015), all such costs are excluded from the break-even calculation.