Yes, if you are regularly using this portion of your garage to store your trailer then you can claim it for storage.
Yes, you will add the garage area as additional square footage to your home.
To do this take the following steps:
- Sign into your return
- Click Take me to my return
- Federal
- Income and Expenses
- Review or Edit next to Self-Employment income and expenses
- Review next to your business
- Scroll down click "Add expenses for this work"
- Scroll almost down to the bottom and select Home Office
- Click Continue
- Enter your garage information
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