What is Depreciation?
Depreciation is the tax deduction for wearing out a business asset over time — you write off its cost gradually instead of all at once.
How it works
The IRS assigns each asset class a useful life (5 years for equipment, 27.5 for residential rental buildings), and you deduct a portion each year. It's a paper expense: you already spent the cash, but the deduction keeps arriving annually.
A quick example
What people get wrong
Depreciation gets "recaptured" — taxed back — when you sell the asset for more than its depreciated value. Plan for that bill, especially when selling a rental property.