I started renting out a house I own 5-1-15 and pay for the trash removal utility.

The problem is that my trash removal bill is paid yearly in one lump sum for the period of Nov2015-Oct2016 of the next year.

Question 1) Do I have to divide the bill by 12 months and only use the portion that would be the last months of 2015 that the bill would have covered? (In this case November and December of 2015.) or could I use the whole bill for 2015 utility expenses even though it covered trash for the next year?

Question 2) Can I only use trash removal utility bills paid in 2015 on my 2015 expenses? Or can I use the portion of the 2014 Trash bill that paid for Nov2014-Oct2015 period. From my calculations this bill would have covered a portion of the period that the house was rented (May, June, July, Aug.,Sept., & Oct. of 2015)?