Supplemental property taxes

[Eric Chan]

Anyone know how to exactly calculate supplemental property taxes.. They are such a pain at the end of the year lol.
Do you guy calculate supplemental property taxes into your flips profit and loss for exact number or do you say "f it" because you know your gonna make a decent profit, and just pay it when it comes. 

When I filed my taxes I didn't put the supplementals into my deductibles >< lol because they haven't arrived yet. Now that it's coming all at once its a pain lol