With the passage and signing into law of H.R.1, aka, The Tax Cuts and Jobs Act, the deduction limit for Section 179 increases to $1,000,000 for 2018 and beyond. The limit on equipment purchases likewise has increased to $2.5 million.
Further, the bonus depreciation is 100% and is made retroactive to 9/27/2017 and good through 2022. The bonus depreciation also now includes used equipment.
See the fully updated 2018 Section 179 Calculator to see how this tax deduction affects your company.