@DaveD_SanDiego you're right! The treaty is designed to prevent double taxation.
In the case of year round residents and those who have become US citizens, it is supposed to do that by including your pension in income but deducting the taxes you paid to the UK. You will enter your UK pension in the same section as the social security benefits. Then you will enter the total amount of the foreign taxes that you paid to your country of origin into the Other Taxes Paid section.
If you are a part year or temporary resident of the US you can file form 8833 with your tax return to exclude your pension from income under treaty. You would enter the income into the section for social security as mentioned above and then report the exact same amount as a negative in the 'Other Income' Section. Then you would attach form 8833 and mail the return in (TurboTax does not support form 8833).
This article has a lot more on this extremely complicated and convoluted issue, and this article by TurboTax has step by step instructions for entering both if that is necessary.
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