your llc is a disregarded entity so that has nothing to do with the answer.
you can not switch to standard mileage method if
5 or more autos used simultaneously ( ex - fleet operations)
or
for those for which you claimed in prior years accelerated depreciation, sec 179 depreciation or additional first year depreciation (section 168(k) sometime referred to as bonus depreciation.
If a single member LLC, the only difference between a sole proprietorship and a single member LLC is the spelling. Literally! The absolute only thing that will change on your tax return, is the addition of the letters "LLC" after the business name on the SCH C, and that's it. Other than that, there's nothing else to do on the tax front.
your llc is a disregarded entity so that has nothing to do with the answer.
you can not switch to standard mileage method if
5 or more autos used simultaneously ( ex - fleet operations)
or
for those for which you claimed in prior years accelerated depreciation, sec 179 depreciation or additional first year depreciation (section 168(k) sometime referred to as bonus depreciation.