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Basically, a Back Door Roth is a two-step process.  First, enter the Non-Deductible Contribution.  Then, report the 1099-R and say Yes, converted to Roth.  You may want to delete your previous entries (or forms) and if you're using TurboTax Online, clear your Cache and Cookies.  Then step through those interview sections again.   Here's more detailed instructions on How to Enter a Back-Door Roth Conversion.   @ksangler 

The reason TurboTax isn't asking for your basis in a simple "box" is that for a rental, your basis isn't a single number—it's a combination of your original purchase price, land value, and 9 years of accumulated depreciation.   To fix the "20% on the full price" error, you must "retire" the asset. Here are the exact steps for the TurboTax Desktop version: Step 1: Report the Sale Go to the Federal Taxes tab -> Wages & Income. Scroll down to Rental Properties and Royalties (Sch E) and click Update. Click Edit next to your specific rental property. On the screen "Review Your [Property Name] Info," click Edit next to the Property Profile. Check the box that says: "I sold or otherwise disposed of this property in 2025." 6. Follow the prompts until you are back at the Rental Summary screen. Step 2: Enter the Basis (The "Assets" Section) This is where 99% of users get stuck. You don't enter the sale under "Expenses"; you enter it under Assets/Depreciation. Scroll down to Assets/Depreciation and click Update. You will see a list of assets (e.g., "House," "New Roof"). You must "sell" each one individually. Click Edit next to the main asset (usually labeled "House" or "Residential Rental Property"). Verify the Cost and Cost of Land shown here. This is your Basis. If these are wrong or $0, fix them here. On the screen "Did you stop using this asset in 2025?", select Yes. Enter the Date of Sale. Step 3: Enter the Sales Price & Closing Costs After entering the date, TT will ask for the Sales Information.  Sales Price: Enter the gross sales price from your 1099-S. Sales Expenses: Enter your closing costs, commissions, and legal fees here. Land vs. Building: TurboTax will ask you to split the sales price between the land and the building. A common method is to use the same percentage as your original purchase (e.g., if land was 20% of the cost, assign it 20% of the sale price). Step 4: Verify in "Forms Mode" Since you are on Desktop, verify the math immediately: Click the Forms icon in the top right. Open Form 4797 (Sale of Business Property). Check Line 20 (Cost or other basis). If this matches your original purchase price plus improvements, the "full sales price" error is fixed. Check Line 22 (Depreciation allowed). This should show the 9 years of history TT carried over. Note on your 20% Payment: When you sent that check to the IRS, you made an "Estimated Tax Payment." To get credit for it, go to Deductions & Credits -> Estimates and Other Taxes Paid -> Federal Estimated Taxes. If you don't enter it there, TT will think you haven't paid a dime yet!

This is 100% my same problem. TurboTax forcing an input for this section to be completed. Extremely aggravating. Hope it’s fixed asap otherwise I’ll have to begin using another service. Feels like this happens with something every year. 

I assume that TurboTax is asking for the value of your IRAs(s) as of December 31, 2025. If so, it does this because you have triggered an error condition such as excess contributions to your IRA, so on line 17 or 25 of the 5239, TurboTax can calculate the penalty which is 6% of the excess or the value of your IRA(s), whichever is smaller.   Normally, you would just enter the amount (which can be found by looking at your IRA account(s) for the value on December 31, 2025 - you don't have to wait for the 5498(s).

Thanks, that's true and a good lesson.  But given all the prompts in the TurboTax program, why didn't they ask the question - 'Did you make any estimated quarterly tax payments?'   Anyway, the full refund has now gone through so everything is good.