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The 2018 Idaho Form 40 instructions lay out the tax tables, which agree with TurboTax.  It shows $3,205 as the tax for a single taxpayer earning between $50,000 - $50,050 (so exactly $50,000 would compute to slightly less - or $3,203).  

You can view these tables at this link below -

https://tax.idaho.gov/forms/EIN00046_01-07-2019.pdf

This calculation ($3,203) also agrees with the brackets posted at the second link below on the site -

https://tax.idaho.gov/i-1110.cfm


Your second calculation appears to mix parts of the single bracket with the married filing jointly (but not entirely).  You should be able to post a link to a URL if you respond to this answer in a comment.  If you want to post the link there, I will take a look at wherever you found that information just for clarification - but the tax tables themselves agree with the first calculation.  

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