Returns including Form 4852 can't be e-filed per IRS regulations. See the following response for additional information on: What do I need to do about my 4852 form?
You can report your Private Canadian Pension (NR4) in another way, which will allow you to e-file.
Enter it in the Other Reportable Income interview, the very last interview in Wages and Income (Federal Taxes > Wages & Income > Less Common Income > Miscellaneous Income ). In TurboTax Online, enter "other reportable income" in the Search Box and then select "Jump to Other Reportable Income". Your entry can be described as "Foreign Pension" or "CA NR-4", and will appear on Line 8 of your Form 1040.
The IRS wants the pension reported as income - unless your pension receives special tax treatment, it is perfectly OK to report it as Miscellaneous Income.
If you choose this way, then you won't have to create a substitute Form1099-R (by filing Form 4852), you won't have to file by mail and you won't encounter e-file errors over the Payer ID. However, the end tax result (in terms of United States tax rate and amount assessed) will be identical under both methods.
@DJS
