If you have no cost in your pension plan, your payments are fully taxable (which is usually the case).
Generally, you have no cost in your plan if you did not contribute any after-tax funds.
Someone must have figured out for your mom (probably the first year she was reporting pension income), that she contributed a bit of her own $ to the plan to arrive at the 92.6% taxable amount.
Her pension payor should be able to tell you that, though. If not, you can indicate that the amount is Box 1 is the taxable amount (as it is in most cases).
Is there an amount in Box 5 of her 1099-R?
If so, that could be the portion of her own funds recovered in 2021. What is the ratio of that amount to the Box 1 amount? If it's 92.26%, you know where that came from!
However, TurboTax can't know (or calculate) what her original contribution amount was. I'm sure she doesn't have her 1987 tax return.
Click this link for more info on Pension Payments.
Here's steps on How to Enter 1099-R.
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