Yes, that's an improvement to your property, that can be listed under Assets/Depreciation.
You may be able to expense the cost of your gutters all in one year, and TurboTax will ask you the questions in the Assets/Depreciation section to see if you qualify. See the FAQ below, for Items $2500 or less, and for Building Improvements.
Where in Premier edition do you enter items for Safe Harbor Election? Do you have to go back to the Expenses section and add it in the last screen that says Any Miscellaneous Expenses?
First you add it in the Assets/Depreciation section. You'll be asked if your improvements cost $2500 or less, and also if your building improvements questions. Then you can make the election, and you go BACK to enter your $2500 or less improvements as expenses. It's a two-step process.
I also added new gutters to the rental, it had none before. Total paid is less than 2500.
How do I enter correctly 179 elections in TT?
In the "Asset Entry Worksheet" field 5, what should be the Type of Asset?
The selection of this categorization seems to drive the validation of this worksheet.
The only way I found to take 179 elections is to use the "F - Rental furnishings" Asset Category. Is it the correct category to use for the new Gutters (rental did not have gutters before)?
If the cost is less than $2500 you can expense it as a repair and skip the asset entry all together.
You may not use section 179 to make improvements to your building*. Section 179 is only for the cost of personal property items you purchase for use inside rental units—for example, kitchen appliances, carpets, drapes, or blinds.
But you may deduct building improvements as "repairs" since the amount is less than $2500. If the amount had been more than $2500, you could still deduct it if you got separate invoices for the gutters and the installation and each was less than $2500.