Owner Occ/Duplex New Roof $13000. can I deduct the entire amt. under Repairs for 2023?

No, not based on your statement that you occupy a section of this duplex.  However, you may be able to use the safe harbor method for the rental portion depending on whether you meet the criteria (shown below).  If not, then you must depreciation the rental percentage of the new roof.

Improvements Election

This election is an option you can take each year that lets you write off some building improvements as expenses instead of assets.

Here are the rules you need to meet to take this election:

• Your gross receipts, including all your other income, are $10,000,000 or less.
• Your eligible building has an unadjusted basis of $1,000,000 or less.
• The cost of all repairs, maintenance and improvements is less than or equal to the smallest of these limits: 
  • 2% of the unadjusted basis of your building or
  • $10,000

This election for building improvements is called the Safe Harbor Election for Small Taxpayers. If you decide to take this option, a form called Safe Harbor Election for Small Taxpayers will show up in your tax return. This election will apply to all your businesses, rental properties or farms.

1. When you come to the screen, Did you buy any items that each cost $2,500 or less in 2020? mark the Yes button and click Continue. 
2. On the screen Let's see if you qualify to deduct these items as expenses, mark both of the Yes buttons and click Continue.
3. On the Now, let's review each item you bought screen, mark whether all your new assets cost $2500 or less. 
4. If you mark that every item cost $2,500 or less, you will be brought to the Rental Summary screen.  You have elected the De Minimis Safe Harbor provision. 
5. If you mark that some cost above $2,500, you will be asked Did you make improvements to rental in 2023?
6. If you say Yes, you will be taken through the screens for the Improvements election.
7. If you say No, you will see the screen Do you have any items that aren't covered by your elections?  Proceed through the screens to enter these assets. 
8. On the Rental Summary screen go to the Expenses section and click on the Start/Update box. 
9. Continue to the Any Other Expenses or Miscellaneous Expenses? screen and enter the description and amount paid for the assets. Click Continue when finished.