What is the Mid-quarter convention?
The mid-quarter convention is an IRS depreciation timing rule that applies when businesses make more than 40% of their total annual qualifying property purchases during the fourth quarter of the tax year. When triggered, this convention requires businesses to calculate depreciation based on when each asset was placed in service during the year, rather than using the simpler half-year convention, which assumes all property was acquired at the midpoint of the year. This timing adjustment typically reduces first-year depreciation deductions on all qualifying property purchased during the year, making earlier purchase timing more tax-advantageous for businesses planning substantial equipment investments. Strategic coordination with Depreciation and amortization planning helps businesses optimize purchase timing to maximize available first-year deductions while avoiding mid-quarter convention complications that reduce immediate tax benefits.
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