Monthly tax calculation starting June and ended in May

Hello,
I would like to help on the Futa & Suta calculation for Fiscal year. Our payroll is started from June and ended in May. When I calculate the Futa tax it does not match with the actual tax because the Futa is based on the first $7000(it usually on the January payroll) and it will stop after that. But our payroll is based on the June. So when I compare the payroll tax b/w the actual and budget, we are way off because of Futa and Suta. Is there a formulas that can calculate the Futa and Suta base on Fiscal year end.

Thank you for your help

An