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This is an update to my September post on TT not being compatible with Windows 10. I made the switch to H&R Block desktop version tax software. It is compatible with Windows 10 and I had no problem installing on my W 10 pc. Cost very reasonable at $64. Can do up to 5 federal returns and includes 1 state. There is also an option to upload a previous return done in TT using the .tax file. This option is very useful for pulling in all basic information. Final software updates will become available in January as there is still flux in the new tax laws. I still feel Intuit made a mistake with not be compatible with W 10. Intuit lost a long time customer because of that decision.  

Just to confirm, what numbers did you run, have your figured your "safe harbor" taking into account prior year tax also; see Form 2210 lines 1-9 which shows the calculation; you need to have paid the smaller of 100% of 2024 tax (110% if AGI > 150k or 75k if filing MFS), or 90% of your 2025 tax.   IRS by default assumes your income and tax due was even through the year per quarter so whatever amount of the safe harbor is underpaid and due via ES, divide that by 4 and that was the quarterly payment that is late for Q1-3 but still on time for Q4.  Pay Q1-3 i.e. 75% of the total ES ASAP to stop that penalty accruing further, and the remaining 25% of it on time by 1/15/26 (submit electronic payment via irs.gov if able, avoid sending checks and vouchers).  At this point you're roughly 8 months late on Q1, 6 months late on Q2, 3 months late on Q3 so the penalty will be roughly 7%*(0.25*(8+6+3)/12)=2.48% on the total ES due.   If your income was uneven thru the year e.g. Q4 Roth conversion or cap gains, then you can try and reduce the penalty when you file using Form 2210 Annualized Income (AI) Method where you have to calculate your AGI/withholding/Qual Divs/LTCG by quarter (uneven - 3/31, 5/31, 8/31, 12/31) which is extra work but if significant penalty may be beneficial.  Turbotax will initially calculate penalty using the default method (check your 1040 line 38 for that outcome), then you can work thru other methods under Other Tax Situations / Underpayment Penalty to see if AI method is beneficial and adopt it (you could also plug in rough estimates for the AI method calculations to see if it helps, then go back and refine it if you chose to use that method).

TurboTax does not calculate the late filing penalties or interest you will owe to the IRS or to the state when you file a tax return past the deadline.    The penalties and interest are calculated by the IRS/state and you are billed after the IRS or state receives your return and your payment for the amount of tax due as shown on the tax form.

Why are you asking here---this is the user forum for TurboTax.  We have no affiliation with Tax Slayer.  We can tell you to track your return yourself on the IRS refund site just like anyone can do:   You need your filing status, your Social Security number and the exact amount  (line 35a of your 2024 Form 1040) of your federal refund to track your Federal refund:    https://www.irs.gov/refunds   To track your state refund:     https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/track-state-refund/L3jgO8PGs_US_en_US?uid=lt447ebr  

@cnj083    Well, if a traditional 401k, and all your other income is exactly the same as last year, then that 5k would be taxed at approximately your marginal tax bracket %.   So, if you are normally in the 22% tax bracket, that might add $1100 to your tax liability .   Of course, the 401k provider may have some automatic tax withholding as a part of any distribution, so you should ask them about that.  IF they give you a choice as to how much to withhold, you could designate a % about whatever % tax bracket you were in last year, and that wouldn't be unreasonable.....though you might not need that much withheld if you normally get a refund.

Thank you again! I suspect you're right and it was one of those issues. But how can I figure out how Turbotax calculated that amount? They just inserted the amount $153 with no indication where it came from. I have no idea if it's right or not.  It's important that I figure out the basis because my employer will (hopefully) cover any penalties due to errors on their end. 

@Hesoukieh    I don't have an answer...but you need to be clear and post which year the overcontribution occurred in.   1)  Was the overcontribution in 2024 or 2025?   (seems difficult for it to be for 2025, though maybe not impossible). 2)  No one can file 2025 taxes yet.   So, did you file 2024 taxes yet?  if the overcontribution was  actually in 2024, then that tax year may be affected, not 2025.

Q.  Will making one estimated payment in January reduce my penalty? A. Yes, but probably not by much, as you "under paid" for the first three quarters of the year. The exception would be if a large part your income was received in the 4th quarter, such as a stock sale or a distribution from an IRA or 401k plan.