Rental Income 2019 Tax

You can always put aside some of the income so that when you have to pay the 2019 final and 2020 preliminary you have sufficient funds to pay Revenue. I think you can pay Revenue in advance and they will hold the amount in credit on your account but why would you do that?
 
Yes I agree with jpd - I put away enough each payday to cover the rental tax due in Nov. We do have a small balance in the rental bank acc but need to keep that for repairs etc and I like to know that I can cover it. If it's not as high as I expected then it's a bonus.