We recently finished the implementation of a TPM system and capitalized the costs of the implementation and placed in service in Dec 2025. While reviewing the tax treatment, it looks like we should have used 15 years SL with mid year convention for tax purposes (it is an SaaS arrangement). How do I fix this so that the tax depreciation recalculates correctly? From what I can read, it should also have no bonus depreciation 

Any advice would be greatly appreciated!!!