“Every Landlord's Tax Deduction Guide” 15th Ed. P219
You used to have to attach a separate written statement to your tax
return electing to claim start-up expenses as a current deduction. This
is no longer required. Instead, you are automatically deemed to have
made the election for the year in which your business began. All you
must do is list your start-up costs as “Other expenses” on your Schedule
E (or other appropriate return). You don’t have to specifically identify
the deducted amounts as start-up expenditures for the election to be
effective. However, if you have more than $5,000 in start-up expenses,
you must amortize (deduct) the excess over 180 months. To do so, you
must complete and attach IRS Form 4562 to your return for the first tax
year you are in business.