Instead of depreciating certain expenditures, you may be able to use an IRS-created de minimis safe harbor to deduct these costs (up to $2,500 per item or invoice). You can find more about the safe harbor from the IRS at https://www.irs.gov/businesses/small-businesses-self-employed/tangible-property-final-regulations. Also keep in mind that in 2018, you can use 100% bonus depreciation to write off the full cost of equipment and machinery as well as certain capital improvements to commercial realty.
Test for determining deductibility of IRA deductions. Active participants in employer retirement plans are subject to IRA deduction phase-out rules if adjusted gross income exceeds certain threshold.