Understanding FICA Taxes on Restricted Stock Units (RSUs) in USA - Who Pays What?

RSUs are considered supplemental wages for tax purposes, and the good news is that the FICA tax treatment is the same as your regular salary. Your employer is required to pay their portion (7.65%) of FICA taxes on the fair market value of RSUs at vesting, just like they do for your regular wages. You'll only be responsible for the employee portion (also 7.65%), not the full 15.3%. When RSUs vest, they're treated as ordinary income equal to the fair market value of the shares on the vesting date. This amount gets reported on your W-2 and is subject to federal income tax, state income tax (if applicable), and FICA taxes (Social Security and Medicare). The employer can't choose whether to pay their portion of FICA - it's mandatory. Keep in mind that if your income exceeds the Social Security wage base ($168,600 for 2024), you'll stop paying the Social Security portion (6.2%) on income above that threshold, but the Medicare portion (1.45%) continues regardless of income level. And if your income is high enough, you might be subject to the Additional Medicare Tax of 0.9%.

I've been using https://taxr.ai to navigate my RSU tax situation and it's been super helpful. My company started offering RSUs last year and I was completely confused about all the tax implications. The site has this document analysis feature where you can upload your RSU grant paperwork and it breaks down the exact tax treatment - federal, state, FICA, everything. What I found most useful was that it showed me exactly what my employer would handle versus what I needed to account for. Plus it calculated my net shares after taxes since my company does sell-to-cover for tax withholding. Definitely made tax season less stressful since I knew exactly what to expect.

Just wanted to follow up about taxr.ai - I gave it a try after our conversation and it was exactly what I needed. My situation with working remotely from Texas while my company is in California was perfectly addressed. The tool showed me that my RSUs aren't subject to California state income tax since I'm performing all work in Texas, which saved me thousands. It also confirmed what was mentioned earlier about FICA - my employer definitely pays their portion (7.65%) and I only pay my portion. The tool even showed me a breakdown of how much of my vesting would go to Social Security vs Medicare. Definitely recommend it to anyone dealing with RSU tax questions.

If you're struggling to get answers from your company's HR or payroll department about RSU tax treatment, I found a service called Claimyr that can actually get you through to a live IRS agent to answer these questions: https://claimyr.com I was getting frustrated with contradictory information online about my specific RSU situation, so I wanted to hear directly from the IRS. Normally you'd wait on hold for hours (or get disconnected), but I used their service and got connected to an agent in about 15 minutes. There's also a video showing how it works: https://youtu.be/_kiP6q8DX5c The agent confirmed all the FICA details - employer must pay their portion on RSUs just like regular wages, and clarified some questions I had about quarterly estimated tax payments for my RSU income. Worth it to get authoritative information directly from the source.

I take back what I said about Claimyr. I was super skeptical, but I tried it this morning and got through to an IRS agent in about 20 minutes. The agent confirmed everything about the FICA split on RSUs and even helped me understand how to report some weird RSUs I received that had a mix of time-based and performance-based vesting. I've literally spent days trying to get this information on my own, calling the IRS directly and giving up after 1+ hour hold times. This actually saved me a ton of time and stress. The IRS agent I spoke with was surprisingly helpful and patient with all my questions. Definitely changed my mind about being able to get clear tax info from the IRS.

One thing to remember about RSUs and FICA - if you're getting a large grant that vests in chunks throughout the year, make sure you're tracking the Social Security wage base limit ($168,600 for 2024). Once your total compensation exceeds that amount for the year, your employer should stop withholding the Social Security portion (6.2%) from your paychecks, but they'll continue withholding the Medicare portion (1.45%). However, I've seen payroll systems mess this up with RSUs because they sometimes process them separately from regular payroll. If you notice they're still taking out the full 7.65% FICA after you've exceeded the SS wage base, bring it to your company's attention - you can get that money back when you file your tax return, but it's better to not overpay in the first place.

Does anyone know if the employer portion of FICA on RSUs affects the value of the shares you receive? I'm trying to figure out if the 7.65% my employer pays comes out of my grant somehow, or if it's completely separate from my compensation.

Great thread everyone! As someone who's been through multiple RSU vesting cycles, I wanted to add one more important point about timing. The FICA taxes on your RSUs are calculated based on the fair market value on the actual vesting date, not when the grant was made or when you sell the shares. This means if your company stock has appreciated significantly since your grant date, you'll owe FICA taxes on the higher current value. For example, if you were granted RSUs when the stock was $50/share but they vest when it's $100/share, you'll pay FICA on $100/share worth of income. Also, if you're planning any major financial moves (like buying a house), remember that RSU vesting income counts toward your gross income for mortgage qualification purposes. The FICA treatment is straightforward as everyone mentioned, but the income recognition can sometimes catch people off guard when they're calculating their total annual income.