It depends on a few things. If you used in business and they cost less than $2500, you can make an annual election and expense them. But the election will apply to all your businesses, rentals and farms.
See FAQ and IRS pub 946 for guidance.
https://ttlc.intuit.com/replies/3302228
https://www.irs.gov/pub/irs-pdf/p946.pdf
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