Is Form 8833 required for every tax treaty benefit? I thought there were some exceptions where you don't need to file it even if you're claiming treaty benefits?

You're right - there are some exceptions. You generally don't need Form 8833 for personal services income under $10,000, or for claiming reduced withholding rates on dividends, interest, royalties, etc. The IRS has a list of exceptions in the instructions for the form. There are also some "general benefits" from treaties that don't require the form. It's the more specific or unusual treaty positions that need disclosure with Form 8833.

From my experience, on Form 1040-NR you can only claim foreign tax credits against income that's considered effectively connected with a US trade or business. For regular passive income like dividends and interest, you usually can't use Form 1116 to offset those taxes on a 1040-NR.

How do you figure out how much to pay quarterly? Do you just divide what she owed last year by 4, or is there some formula? Also, do you get some kind of receipt you can use when you file?

You have a few options for calculating quarterly payments. The simplest is to take what she owed last year and divide by 4, which is what we do. As long as you pay 100% of your previous year's tax liability through withholding or estimated payments, you're generally safe from penalties (110% if your income is over $150,000). Yes, you get a confirmation number when you make the payment online, and you should keep those records. When you file your taxes, you'll report these payments on your return (usually on Form 1040-ES). The IRS system will match them up with your account automatically.

I did the comparison last year when my husband had 1099 income and I had W-2. For us, filing jointly saved about $1,800 compared to separately. The main reason was that filing separately prevented us from claiming certain credits and deductions. Filing separately is usually only better in very specific situations, like if one spouse has income-based student loan payments, massive medical expenses that wouldn't meet the threshold based on combined income, or if one spouse has tax issues you want to keep separate.

That's a helpful breakdown. I didn't realize all those different taxes added up like that. My state tax is about 5% and I am contributing 3% to the company 401k (they match it). I think there's also a small city tax where I live. But even accounting for all that, when I calculate it out, it still seems like my federal withholding specifically is too high compared to what my actual tax rate should be. I'll definitely check my W-4 like others suggested.

You're on the right track! The 401k contribution is actually helpful tax-wise because it reduces your taxable income, but it does decrease your take-home pay temporarily. The good news is you're getting that company match, which is essentially free money for your future. The combination of your state tax, city tax, FICA taxes (Social Security and Medicare), and federal withholding can definitely add up quickly. Definitely check that W-4 form - it's the most common reason for overwithholding. Many people don't realize that the default withholding often assumes you'll be making that same amount for the entire year, which can lead to higher withholding if you haven't worked the full year yet.

That's exactly what happens! Payroll systems typically calculate your withholding as if each paycheck represents your normal pay for the entire year. So if you suddenly get a bigger paycheck, the system thinks "oh this person is now in a higher tax bracket" and withholds accordingly. The same thing happens with bonuses or overtime - they get withheld at a higher rate. The good thing is it usually balances out when you file your taxes, and you get the excess back as a refund.

Thank you for this advice. What kind of documentation would show the mom acknowledges the living arrangement? We don't have anything formal since we never went to court over custody.

Text messages or emails where she mentions or confirms the living arrangement can work. If you have any written communication where she acknowledges the child lives with you most of the time, save it. Social media posts can sometimes help too. Child support payments (if you receive any) can also establish the arrangement. If she listed you as a contact on school or medical forms, that's also useful. Even if you don't have a formal custody agreement, building a paper trail of everyday life showing you're the primary caregiver can be very convincing to the IRS.

With TurboTax, select "Other eligible dependent" or sometimes they have an option like "Not related but member of household." Then it'll ask if they lived with you for more than half the year - make sure to say yes. It'll calculate the correct credit for you. I've done this for years with my partner's kid.

Just checked and there's nothing in box 8, so I don't think it's allocated tips. All my tips are reported in box 7 as "Social security tips" with $10,065. Could it be that I'm supposed to be paying extra social security on those somehow? Like both the employer and employee portion?

If your tips are in box 7 and not box 8, your employer should have withheld the correct social security tax on them. The amount withheld should be 6.2% of the combined wages (box 3) and tips (box 7). Since your tips are properly reported in box 7, you're only responsible for the employee portion (6.2%), not the employer portion. Check if the amount in box 4 (Social security tax withheld) equals 6.2% of the combined amount in boxes 3 and 7. If that's correct but you're still seeing the huge refund drop, it might be how the tax software is handling the second W-2. Try entering your W-2s in a different order or double-check that you haven't accidentally entered the tip income twice.

This is exactly what happened to me last year! My full-time job was withholding as if it was my only job, and when I added my second W-2, my refund dropped by like $1,500. Freaked me out until I realized it was just fixing an incorrect excess calculation.