That would be a rental property reported on schedule E Your boat would be an asset that you depreciate over time. Expenses like the boat slip are prorated between personal and rental if they are used for both .
https://finance.zacks.com/type-property-irs-considers-residential-rental-property-9946.html
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.
