Cap situation and the cap floor

[DrSpaceman]

With the current signees and with the amount the team had to spend in FA, it seems they have to be below the 89% cap floor?

Reading about it, its not any single year the floor has to be reached, its over a 4 year period, which started last year, in 2017, so this is year two of 4 where total they have to reach the cap floor of 89%.

But it seems they are way under it right now for 2018. Does all that carry over to 2019 if its unused? Would make for a huge amount to be able to spend next year.