Any items that have a useful life of at least one year should be depreciated, beginning on the in-service date (when the property was available to be rented). This category includes furniture, carpet, and appliances.
Items that are consumed or likely to last less than a year (which would include most household items) would be reported as rental expenses in the year the property was first made available to be rented.
More info from TurboTax Tax Tips: Tax Deductions for Rental Property Depreciation
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