Don't forget about the Qualified Business Income Deduction (Section 199A)! As a martial arts instructor with your own business, you likely qualify for this. It lets you deduct up to 20% of your qualified business income, which can significantly reduce your taxable income. So if your profit after expenses is $5000, you might be able to take another $1000 off your taxable income with this deduction. It's on Form 8995. Lot of small business owners miss this!

Great advice from everyone here! As someone who also operates a small martial arts business, I'd add a few practical tips for Mateo: 1. **Keep detailed records NOW** - Don't wait until next tax season. Track every business expense, no matter how small. I use a simple spreadsheet with columns for date, amount, description, and category. 2. **Separate business and personal expenses clearly** - Even though you're using your SSN, treat this as a legitimate business. If you buy equipment that you also use personally, only deduct the business portion. 3. **Consider quarterly estimated tax payments** - With $8400 in profit, you'll owe self-employment tax plus income tax. The IRS expects you to pay as you earn, not just at year-end. Use Form 1040-ES to calculate and avoid underpayment penalties. 4. **Document your business use of home** - If you use part of your home for business planning, storing equipment, or administrative work, you might qualify for the home office deduction. Measure the square footage and keep records. The 1099-K can be intimidating the first time, but once you understand that it's just a reporting document and not necessarily your exact taxable income, it becomes much more manageable. You've got this!

Quick tip that helped me with a similar Depop situation: take photos of your closet/items before selling them as additional documentation. The IRS knows you're not running a business if you're just selling random personal items from your closet at a loss.

This thread has been incredibly helpful! I'm dealing with a similar situation where I sold some old designer bags and shoes on various platforms and received multiple 1099-Ks. One thing I want to add for anyone in this situation - don't panic when you see that 1099-K amount! It looks scary but remember it's just reporting gross payments, not your actual taxable income. Like everyone mentioned, if you sold personal items for less than you paid, you're not making taxable profit. I ended up creating a detailed spreadsheet tracking each sale, and even though I estimated most of my original costs (who keeps receipts for shoes from 2018?), I was conservative with my estimates. For example, if I thought I paid around $150-200 for something, I'd estimate $150 to be safe. The key is being able to show these were clearly personal items from your closet, not business inventory. Screenshots of your listings showing the items as "from my closet" or "gently worn" can help demonstrate this too.

I just take a picture of mixed receipts immediately and mark them up digitally using my phone's markup tools. Circle business items in red, add up the subtotal right on the image, and calculate the proportional tax. Then save to a tax folder in my cloud storage. My accountant said the IRS doesn't require original paper receipts anymore - digital copies are acceptable as long as they're legible and you can prove the expense was for business.

Great question! I've been dealing with this exact same issue as a freelance consultant. Here's what I've learned works best: For mixed receipts, definitely keep them - just be methodical about marking them up. I use a simple system: I circle all business items in blue ink and write "BIZ" next to each one, then total up just those items at the bottom of the receipt. This makes it crystal clear what portion was for business. For the sales tax calculation, the proportional method is totally acceptable. If your business items were $30 out of a $60 total purchase, then you can claim 50% of the sales tax ($6.43 out of your $12.85 example). The IRS just wants to see that you have a reasonable, consistent method. One tip that's saved me time: I do this markup immediately while I'm still in the parking lot or as soon as I get home. Trying to remember what was business vs personal weeks later is nearly impossible, especially for generic items like batteries or folders. Your spreadsheet approach sounds solid - just make sure you're only entering the business portion of each receipt, including the calculated business portion of sales tax. Keep those marked-up receipts organized by month in case you need them later!

Has anyone used TurboTax for reporting ESPP and RSU sales? I'm wondering if they have any built-in tools for calculating the correct cost basis. I transferred my shares to Fidelity last year and now I'm worried I might mess up my taxes.

One thing I'd add to all the great advice here - make sure you understand the "look-back" provision that many ESPPs have. This can significantly affect your cost basis calculation and whether you have a qualifying disposition. Many ESPPs allow you to purchase shares at a discount based on the LOWER of either the stock price at the beginning of the offering period OR the stock price at the end of the offering period. If your plan had this feature, your actual purchase price might be different than what you think, and this affects both your cost basis and the amount of discount that gets taxed as ordinary income. I learned this the hard way when I sold some old ESPP shares and discovered my cost basis was actually lower than I calculated because of the look-back provision. Check your original ESPP plan documents or contact your former employer's benefits team to confirm if your plan had this feature. Also, don't forget that some brokerages will automatically apply incorrect cost basis adjustments when you transfer ESPP shares. Make sure to review and correct these before you sell, or you might end up paying taxes on money you've already been taxed on.

I've been doing my own taxes for about 8 years now and always wondered the same thing! Reading through these responses has been really eye-opening. I think the main takeaway is that even "simple" tax situations might not be as simple as we think they are. What strikes me most is how many people discovered they were missing credits they never knew existed - the Saver's Credit, American Opportunity Credit, various state credits. It sounds like the real value of tax preparers isn't some secret knowledge, but rather their systematic approach to asking the right questions and not assuming anything. I'm definitely going to try one of those AI review tools mentioned here before filing this year. Even if I don't find anything, at least I'll have peace of mind. And if I do find something significant, maybe it's worth getting a professional review every few years just to make sure I'm not developing any blind spots. Thanks everyone for sharing your experiences - this has been way more helpful than just getting a generic "it depends" answer!

This thread has been incredibly enlightening! As someone who's been using TurboTax for the past 6 years thinking my single W-2 situation couldn't possibly have any complexity, I'm now realizing I might have been way too confident about leaving money on the table. What really opened my eyes was reading about all these credits people discovered they were missing - especially the Saver's Credit since I contribute to my 401k and had no idea there was an additional credit beyond the pre-tax benefit. The way everyone describes the software asking questions but not providing enough context really resonates with me. I've definitely clicked "no" on screens when I wasn't sure what they were asking about. I think the key insight here is that tax preparers aren't performing magic - they're just systematically trained to ask follow-up questions and not assume anything. Meanwhile, software assumes we know what all these different credits and deductions are and when we qualify for them. I'm definitely going to try that AI review tool on my completed return before filing this year. Even if it doesn't find anything, at least I'll know I'm not missing obvious opportunities. And if it does find something significant, maybe it's worth the investment to have a professional do a comprehensive review every few years just to establish I'm not developing any systematic blind spots. Thanks to everyone who shared their experiences - this has been way more valuable than any generic tax advice I've found online!