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If you have purchased a building or you have a business loan, you probably have interest expenses. The 2017 tax law has limited the amount of interest expense for larger businesses.
Starting in 2018, the interest rate deduction for larger businesses is limited at 30% of the company's EBITDA (earnings before interest, taxes, depreciation, and amortization). But, smaller companies with annual average gross receipts of $25 million or less for the past three years are exempt from this restriction, meaning they can take all interest expense deductions with no limit.