Thanks for mentioning Form 3921! I do have that form and have been keeping it with my tax documents. One question though - when reporting the sale, do I need to reference this form or attach anything special to my return? Or do I just use it to determine my cost basis when filling out Schedule D?

You don't need to attach Form 3921 to your return or reference it specifically. It's primarily for your records to help you accurately report the transaction. You'll use the information from it to determine your cost basis when filling out Schedule D. When you sell, your brokerage will report the sale on Form 1099-B, but often they don't have your correct cost basis for ISO shares, so you may need to make an adjustment. That's where your Form 3921 comes in handy - it has the correct information for your cost basis (what you paid when exercising).

I used TurboTax Premier last year for my ISO sales and it worked fine. There's a specific section for stock options and it walks you through the process. Just make sure you have all your documentation ready (exercise price, date of exercise, sale price, etc). The key is entering the correct cost basis.

Thanks for bringing this up! I am actually above the income limit for deductible contributions, so I'll definitely need to file Form 8606. Do I still report the recharacterized amount ($5,300) on that form, or do I need to use the original $6,000?

You would report the recharacterized amount ($5,300) on Form 8606 since that's what actually went into your Traditional IRA. This becomes your basis in the Traditional IRA for future distributions or conversions. Form 8606 is really important in your situation because it establishes that you've already paid tax on this money. Without it, you could end up being taxed twice on the same funds when you eventually withdraw them.

I agree. The fact that the 5498 only shows the recharacterized amount ($5,300) is exactly right. The IRS treats this as if you had contributed $5,300 to the Traditional IRA from the beginning. The $700 loss is just part of the investment experience, not an excess contribution that needs to be withdrawn.

That's a really interesting approach I hadn't thought of. Do you typically find that the equity accounts in QuickBooks accurately reflect true tax basis? I've seen some companies where the books don't properly track things like Section 179 adjustments or other tax-specific items.

You're right that QuickBooks equity accounts won't perfectly match tax basis. They're just a starting point. The biggest discrepancies usually come from 179 deductions, depreciation differences, and non-deductible expenses. Look for a reconciliation schedule in the prior preparer's workpapers that bridges book to tax. If that doesn't exist, you can build one by comparing Schedule M-1 adjustments across years. The equity accounts give you the structure, then you layer on the tax adjustments. It's still work, but often less than starting from scratch with just K-1s.

I've used these materials and they're excellent. The basis worksheet is particularly helpful for new preparers. Just note that they don't fully address some of the more complex situations like multiple classes of stock or special allocations.

Thanks for this perspective! Could you clarify what counts as "reasonable documentation" for small cash transactions? And how worried should I be about the home office deduction? I've heard mixed things about whether it increases audit risk.

For small cash transactions, a simple log or journal is sufficient - date, amount, purpose, and from whom if applicable. The IRS doesn't expect small business owners to provide receipts for every $5 transaction, but they do expect you to have a system. Apps that track expenses are great for this. The home office deduction has lost much of its audit trigger reputation in recent years, especially since so many more people work from home now. Just be honest about the square footage and exclusive use. The simplified option ($5 per square foot up to 300 sq ft) is very audit-friendly since it's standardized. If you're legitimately using the space exclusively for business, take the deduction - it's yours by right.

What's your method for the "reasonable monthly allowance" part? Do you just estimate an average or do you have some system to make sure it's accurate enough?

Oh that's really good to know. I actually have a side gig in addition to my main job, but they're both withholding OASDI. How do I figure out if I've overpaid? Do I just add up the OASDI from both W-2 forms?

Yes, you just add up the OASDI tax amount (box 4) from all your W-2 forms. If the total exceeds $10,740 (for 2025), then you've overpaid and can claim the difference as a credit. Just make sure you're only looking at the employee portion. Some people mistakenly include both the employee and employer portions when calculating this, but you can only get a refund on what you personally paid over the limit.

Haha same! It's like a little year-end bonus. I actually think of it as forced savings that gets "returned" to me near the holidays.

Exactly! It comes right when holiday shopping starts ramping up. Not a huge amount extra but definitely noticeable and appreciated!