Important note: if your amendment results in you OWING more tax, make sure to include a check with your amendment! The interest starts accruing from the original due date, not from when you file the amendment. I learned this the hard way last year :

Based on my experience and what I've learned from tax professionals, you typically do NOT need to include your complete original tax return when mailing an amended return. The Form 1040-X is specifically designed to show the IRS what's changing - it has columns for original amounts, changes, and corrected amounts. What you should include: - Completed Form 1040-X - Any schedules or forms that are being changed (like Schedule A if amending itemized deductions, Schedule C for business changes, etc.) - Supporting documentation for the changes (new W-2s, 1099s, receipts, etc.) - A brief cover letter explaining what you're amending and why The inconsistent answers from IRS agents are unfortunately common since they handle so many different scenarios. The safest approach is to follow the official IRS instructions for Form 1040-X, which don't require sending your entire original return. The IRS already has your original filing in their system - they just need to see what's changing and the documentation to support those changes. Make sure to write "AMENDED RETURN" clearly at the top and send it certified mail for tracking purposes!

For anyone still struggling with this, I've found that the key is understanding that the new W4 essentially works in layers. Step 1 sets your baseline withholding based on filing status and salary. Steps 2-3 adjust for multiple jobs or spouse's income. Step 4 is where you make fine-tuned adjustments. Here's my practical approach: First, use any paycheck calculator to see what your baseline withholding would be with just Step 1 filled out. Then calculate your total desired annual withholding (110% of last year's tax in your case). The difference between these two numbers is what you put in Step 4(c) divided by your remaining pay periods. For the front-loading vs back-loading strategy, I submit updated W4s quarterly. Q1-Q2 I put a smaller amount in 4(c), then increase it significantly for Q3-Q4. Just remember that any RSU vesting or bonuses will have their own withholding (usually 22%) that you can't control with your W4, so factor that into your calculations. The math gets easier once you break it down into these components.

I've been dealing with this exact same situation for the past two years and have finally found a system that works really well. The key insight that changed everything for me was realizing that you need to think about withholding in three separate buckets: regular salary withholding (controlled by your W4), supplemental wage withholding (RSUs/bonuses at flat rates you can't control), and estimated tax payments if needed. Here's my step-by-step process: First, I calculate our total expected tax liability using last year's return as a baseline, adjusting for any major income changes. Then I figure out what will be withheld automatically from supplemental wages (22% for most RSUs and bonuses). Next, I determine how much additional withholding I need from regular paychecks to reach my safe harbor target (110% of last year's tax). For the front-loading vs back-loading strategy, I've found it helpful to create a simple spreadsheet that tracks cumulative withholding by quarter. I start with minimal extra withholding in Step 4(c) for Q1-Q2, then ramp it up significantly for Q3-Q4. This way I'm not giving the IRS an interest-free loan for most of the year, but I still hit my safe harbor requirement. The most important thing I learned is to update your W4 every time you get a bonus or RSU vesting, because those events change your withholding needs for the remainder of the year. It sounds like extra work, but it's actually saved me from both underpayment penalties and massive overwithholding.

This is such a valuable thread - I'm dealing with almost the exact same situation right now! My employer allocated about 85% of my income to the higher-tax state when I actually spent closer to 60/40 split between the two states. Reading through everyone's experiences here has been incredibly helpful and given me the confidence to move forward with filing based on my actual time allocation. I particularly appreciate the detailed advice about documentation and explanation letters. It's clear that being proactive and transparent with the state tax departments is key to success. I'm going to start by checking for any reciprocity agreements (great tip from Sophie!), then gather all my lease agreements, utility bills, and work calendar records. One question for those who've been through this - did any of you face pushback from your employers when requesting corrected W2s? My HR department has been pretty dismissive so far, claiming it's "too complicated to change now." I'm wondering if I should escalate to payroll/accounting directly or just proceed with the self-filing approach since that seems to have worked well for everyone here. The potential savings make this definitely worth pursuing. Thanks to everyone for sharing their experiences - it's exactly what someone in my situation needs to see!

I'm in a very similar situation and this thread has been incredibly helpful! My employer incorrectly allocated about 70% of my income to the higher-tax state when I actually worked there only about 45% of the year. I've been hesitant to file with different numbers than my W2, but seeing so many successful outcomes here gives me confidence. A few things I'm taking away from everyone's experiences: 1) Try for a corrected W2 first but don't let employer reluctance stop you from filing correctly, 2) Document everything thoroughly (lease agreements, utility bills, work calendar), 3) Include clear explanation letters with your state returns, and 4) Check for reciprocity agreements first as Sophie mentioned. I'm particularly encouraged by the stories of state tax departments being reasonable about these discrepancies when proper documentation is provided. It sounds like being transparent and proactive is much better than just accepting an incorrect allocation. The potential savings (I'm looking at about $280) definitely makes this worth pursuing. One follow-up question - for those who filed with different allocations, did you use any specific language in your explanation letters that seemed to work well with the state tax departments? I want to make sure I hit the right tone when explaining the W2 discrepancy.

I just wanted to thank everyone for the incredibly detailed and helpful responses in this thread! As a newcomer to this community, I'm impressed by how thorough and practical the advice has been. I'm actually facing a similar situation with a different twist - I received a 1099-NEC for what should have been accountable plan reimbursements, but some of the "reimbursements" were actually advance payments that I never ended up spending (the meetings got moved to virtual). I'm wondering if I still use the same Schedule C approach, or if there are different rules when you received money but didn't actually incur the corresponding expenses? The advice about keeping detailed documentation, using clear business activity descriptions, and properly categorizing expenses on Schedule C has been invaluable. I'm definitely going to create that expense-to-payment matching spreadsheet that was mentioned - it seems like the kind of organization that could save hours of headaches later. One thing I noticed throughout this discussion is how common this mistake seems to be with companies incorrectly issuing 1099-NECs for reimbursements. It makes me wonder if there should be better guidance or training for corporate accounting departments to help them distinguish between actual non-employee compensation and expense reimbursements.

As someone who's dealt with tax compliance issues for small businesses, I want to emphasize how important it is to get this documentation organized properly. The Schedule C approach everyone has outlined is absolutely correct, but I'd add a few practical tips for implementation: First, when you're entering the expenses on Schedule C, make sure each category aligns with IRS expectations. For example, if you had meals during travel, remember that business meals are generally 50% deductible unless they qualify for 100% (like meals provided by the company during business travel). Don't just deduct the full reimbursement amount if it included meals that should be limited. Second, consider creating a simple cover letter that you keep with your tax records (not filed with your return) explaining the situation. Include the company name, dates of travel, business purpose, and a statement that these were expense reimbursements incorrectly reported as 1099-NEC income. This isn't required, but it could save you time if you ever need to explain the situation to a tax professional or during an audit. Finally, going forward, I'd strongly recommend asking Company Z to implement proper accountable plan procedures for any future reimbursements. Share IRS Publication 463 with their accounting department - it clearly explains the difference between accountable plan reimbursements and taxable compensation. Many companies make this mistake simply because they don't understand the rules, not because they're trying to shift tax burden to you. The zero net profit on Schedule C is completely legitimate here and shouldn't raise any red flags as long as your documentation is solid.

My tax person told me that for 2024, the rules are different if the total estate was over $13.61 million. Was your dad's estate really big beyond just the house? If it was over that amount, there might be estate taxes to consider, but most people don't hit that threshold.

Just want to add one important detail that might help - make sure you keep good records of the property appraisal that was done after your dad's death. That appraisal establishing the $285,000 value is what determines your stepped-up basis, and you'll want to have that documentation if the IRS ever questions your return. Also, since you mentioned this happened "last year," make sure the date of death and date of sale are both clearly documented on your Schedule D. The IRS likes to see that timeline to confirm you're handling inherited property correctly. If there was any time gap between when your dad passed and when the appraisal was done, you might want to note that as well. Sounds like you're on the right track with reporting zero gain - just make sure your paperwork is solid to back it up!