why is it asking me for 2024 form 2210 line 4 or form 2210-f line 6. I did not have that form from last year. they want to charge me a penalty for underpayment

[lmcqueen12345]

what is for 2210

[JamesG1]

Use IRS form 2210 Underpayment of Estimated Tax to see if you owe a penalty for underpaying your estimated tax.

You are asked about 2024 information because:

• for most filers, if your federal tax withholdings and timely payments are not equal to 90% of your current year tax, or 
• 100% of the total tax from the prior year (whichever is less), 
• then you may need to complete Form 2210 to determine if you are required to pay an underpayment penalty.

See this TurboTax Help.

[baldietax]

Form 2210 is Underpayment of Estimated Tax, it's calculated but not filed by default unless you have an exception.  If you are using desktop you can view the form in Forms mode (2210-F is for farmers and fishermen).

This is asked under Other Tax Situations / Underpayment Penalties and normally carried over from 2024 return but Turbotax will ask to confirm it in that section.  Not sure where you are in the interview flow but where is one reference to it.

Per Form 2210, to avoid penalty in 2025 you need to have paid thru withholding or timely (usually quarterly) estimated taxes, the smaller of - 100% of your 2024 tax (110% if AGI > 150k or 75k if filing MFS), or 90% of your 2025 tax.  this is your "safe harbor" amount of tax you need to pay to avoid penalty.

"tax" here refers to this Line 4 definition.  It's generally Line 22 of your 1040 plus certain additions from Schedule 2, less refundable credits, see instructions here

https://www.irs.gov/pub/irs-pdf/i2210.pdf