Since no one mentioned it yet - don't forget that 2025 tax rules now allow each qualifying child to potentially get you up to $2,000 in tax credits (that's the increased amount after the recent tax law changes). So make sure whoever claims each child can actually benefit from the full credit amount. If your girlfriend doesn't have enough tax liability due to her part-time work, she might not be able to claim the full child tax credit amount even though she's eligible to claim your son. Something to consider when deciding who claims which child!

Great question! I was in a nearly identical situation a couple years ago. One thing that really helped me was getting everything organized early in the year rather than scrambling at tax time. Since you're paying the mortgage and most household expenses, you should definitely qualify for Head of Household status when claiming your daughter. Just make sure you're tracking everything - I started keeping a simple monthly log of who paid what, which made things so much clearer when it came time to file. Also worth noting that the IRS has gotten stricter about auditing HOH claims in recent years, especially when there are multiple taxpayers at the same address. But if you legitimately pay more than 50% of household costs and have proper documentation, you should be fine. The key is being able to prove your contribution level if they ever ask. One last tip - consider having a quick consultation with a tax professional this year to make sure you're set up correctly going forward. It's much easier to establish the right pattern from the beginning than to fix problems later!

Has anyone used the IRS Form 8801 (Credit for Prior Year Minimum Tax) worksheet to calculate this? I think that's where you'd see how much of your prior AMT can be used this year. In my experience, the credit can be limited if your current year regular tax isn't sufficiently higher than your tentative minimum tax.

This is a really common confusion with ISOs and AMT! The key thing to understand is that AMT adjustments are tied to specific shares, not transferable between different ISO exercises. Since you exercised different ISOs in 2022 (which triggered AMT) versus the ones you sold in 2023, you cannot adjust the cost basis of the 2023 sale using the 2022 AMT payment. Each ISO exercise creates its own AMT adjustment that only applies to those specific shares when sold. The AMT credit you're seeing in TurboTax is separate from basis adjustments. This credit can only be used in years when your regular tax exceeds your tentative minimum tax (AMT). If it seems smaller than expected, it's likely because your 2023 tax situation is limiting how much you can use - the unused portion will carry forward to future years. For the tender offer complication, make sure you're reporting the correct cost basis for the shares you actually sold (without any AMT adjustment since those weren't the shares that triggered AMT). The different companies handling the transactions shouldn't affect the tax treatment, but you'll want to ensure you have accurate documentation of your original exercise dates and prices. Consider reviewing Form 8801 to see exactly how your AMT credit is being calculated and limited. The math can be tricky but it will show you why you're only able to use a portion of your available credit this year.

Don't forget about self-employment tax! On $105k of net income, your SE tax alone will be around $14,800 (15.3% of 92.35% of your net income). That's ON TOP of your income tax. This is the part that shocked me my first year freelancing. I had saved for income tax but completely forgot that I now had to pay both sides of Social Security and Medicare. Make sure you're calculating your quarterly payments including BOTH income tax AND self-employment tax!

Just to add another perspective - I'm a freelance graphic designer and was in a similar situation last year with around $120k in 1099 income. Here's what I learned the hard way: The penalty isn't just about the percentage - it's also about cash flow. Even if you're willing to pay a penalty, having to come up with $25,000-30,000 all at once in April can be brutal. I thought I had enough saved, but then had some unexpected expenses in March and suddenly scrambling to pay my tax bill was incredibly stressful. What worked for me was setting up automatic transfers to a separate "tax account" every time I got paid. I transfer 30% immediately - covers both income tax and self-employment tax with a small buffer. Then I make the quarterly payments from that account. Takes the guesswork and stress out of it. Also, don't forget that if you end up owing more than $1,000 when you file, you might be required to make estimated payments the following year regardless. So you might as well get into the habit now rather than dealing with penalties and scrambling later.

Has anyone used the IRS's Interactive Tax Assistant for this kind of question? I think it has a module specifically about filing status and dependents. Might be worth checking before paying for services.

Just wanted to add another perspective here - I'm a tax preparer and see this situation frequently. The advice about your girlfriend claiming both kids and filing HOH while you file Single is generally correct and usually optimal, but there's one scenario worth considering. If your girlfriend's self-employment income fluctuates significantly year to year, you might want to consider alternating who claims the kids. In years where her business income is very low, she might not have enough earned income to maximize the Earned Income Tax Credit, and you might benefit more from claiming one child for HOH status. Also, since she has self-employment income, make sure she's taking advantage of the home office deduction if she uses part of your home exclusively for her photography business. That can reduce both her income tax and self-employment tax liability. One last thing - document everything about your living arrangements and who pays what expenses. The IRS does occasionally question HOH status and dependent claims for unmarried couples, so having clear records of your household setup will help if any questions arise.

I really appreciate all the thorough advice everyone has provided! This thread has been incredibly helpful in preparing me for the conversation with my neighbor and eventual consultation with our site coordinator. Based on everything discussed here, I now have a clear checklist of information to gather: 1) Any Medicare correspondence from late 2023 about premium adjustments (IRMAA) 2) Details about major financial events in 2022 (property sales, large distributions) 3) All SSA correspondence, even if it seemed routine at the time 4) Information about any work income while receiving benefits 5) Whether they've already notified SSA about the father's death 6) Their 2022 and 2023 tax returns for context The insights about IRC Section 1341 "claim of right" calculations and the distinction between pre-existing overpayments versus post-death benefit issues have given me the technical background I need to have an informed discussion with our experienced preparers. What strikes me most is how complex these SSA-1099 Box 4 situations can be - there are so many potential causes from IRMAA adjustments to earnings test violations to benefit coordination issues. I'm grateful to this community for helping me understand that thorough preparation and documentation will be key to resolving this efficiently for my neighbor's family during this difficult time. Thank you all for taking the time to share your expertise. This is exactly why I value being part of this community - the collective knowledge here is invaluable for helping taxpayers navigate complex situations.

As someone who's worked through similar SSA-1099 Box 4 situations with elderly family members, I want to echo what others have said about the importance of thorough preparation. Your approach of gathering all the information before meeting with your site coordinator is exactly right, especially given the complexity and emotional difficulty of the situation. One additional consideration that hasn't been mentioned yet: if the father's Box 4 repayment is truly about half his annual benefits, there's a possibility this could be related to a "windfall elimination provision" (WEP) or "government pension offset" (GPO) adjustment. These provisions can reduce Social Security benefits for people who also receive pensions from work where they didn't pay Social Security taxes. Sometimes these adjustments are applied retroactively when SSA discovers unreported pension income, which could explain the substantial repayment amount. I'd suggest adding to your checklist: ask if either parent ever worked for a government entity (federal, state, or local) or received any pension payments that weren't subject to Social Security taxes. Even small pensions from years ago can trigger these provisions, and the adjustments can be quite significant. Given everything this family is dealing with right now, your careful preparation will really help ensure their tax situation gets resolved correctly without requiring multiple appointments. The VITA program is such a valuable service, and volunteers like you who take the time to understand complex situations make all the difference.