The company saves Corporation Tax of 12.5% of the value paid out in salary.
The above assumes the company has no other money. Of course this is possible but how realistic is it? If the prior-year profit is entirely distributed as salary (eg financed by the net after-tax profit brought forward plus the anticipated Corporation Tax refund/credit) the Corporation Tax cost to the company is zero.
All other things being equal - it is as realistic as is required to prove the point. Each year's profits should be considered on their own over the years. The prior-year profit funded, in your example, by PAT plus CIT refund/credit .. .. .. hmmmm .. for argument's sake, to prove the point more clearly and again taking each year in isolation for ease of understanding; I would describe it as the draft-PBT showing a profit of EUR20,000 - but with final-PBT after director-bonus of EUR20,000, showing a Nil profit.