Start-up Costs. You may elect to deduct up to $5,000 of
start-up costs in the year your business begins operations. The $5,000
first-year deduction limit is reduced by the amount of start-up costs exceeding
$50,000.
Start-up costs that exceed the first-year limit of $5,000
may be amortized ratably over 15 years. The amortization period starts with the
month you begin operating your active trade or business
So, you can file an amended 2018 return and claim up to
$5000 of expenses. You cannot report 2018 expenses on your 2019 return, but you
can claim 1 year of amortization.
If “we” is you and your spouse, you can file as a QJV
(Qualified Joint venture). That is, you may divide the income and expenses and
each report your share on a Schedule C (sole proprietorship).
See: https://www.irs.gov/businesses/small-businesses-self-employed/election-for-married-couples-unincorpo...
