Can a social security number be used as a TIN on a 1099R for distribution for death benefits?

I'm not sure why your SIL used her SSN.  The distribution presumably came from the estate.  The estate should have an EIN and that's what should be on the 1099.  Also, why 1099-R from an estate?  An estate would never issue and 1099R

 

Also, a distribution from an estate may or may not be taxable.  Part of it might be taxable, part not taxable, or perhaps none of it is taxable.

 

The Estate probably should have filed a Form 1041...and the beneficiaries would have received Sch K-1 (1041) shown distributions and what is taxable.

 

If the estate did not file a 1041, probably should have used the decedent's SSN on a F1099-MISC?????

 

https://www.irs.gov/businesses/small-businesses-self-employed/deceased-taxpayers-filing-the-estate-income-tax-return-form-1041

 

You must mail the tax return.  The social security number (SSN) will be be allowed for e-file on a Form 1099-R. Change your return to paper file by mai land TurboTax will provide all the instructions.  Don't be alarmed, the USPS usually stamps today's day for hours after 12 AM and the IRS is lenient with a one day difference on postal date and filing date.