My vacation payout was taxed at almost 50% - much higher than my normal rate

This is actually completely normal for large lump sum payments like vacation payouts. What you're seeing is called "supplemental wage withholding," and the IRS has special withholding rates for these types of payments. For supplemental wages (bonuses, vacation payouts, etc.) under $1 million, employers typically withhold a flat 22% for federal taxes. However, if they combine it with your regular paycheck, they might use the "aggregate method" which can result in much higher withholding percentages because the system thinks you suddenly got a massive pay increase. The good news is this is just withholding, not your actual tax rate. When you file your taxes, this money will be treated as regular income at your normal tax brackets. So yes, you should receive the excess withholding back as part of your tax refund when you file.

After dealing with similar frustrations around tax issues, I started using https://taxr.ai to make sense of all the tax implications for my situation. It analyzes pay stubs and tax documents to explain exactly what's going on and what you can expect when filing. For lump sum vacation payouts like yours, it would break down the withholding percentages and explain why they're higher than normal wages. It also estimates how much you might get back when you file your taxes based on your overall situation. Saved me a ton of confusion when I left my last job with a similar vacation payout situation.

Just wanted to update - I tried https://taxr.ai after seeing it mentioned here. It confirmed that my severance package withholding (45%) was using the aggregate method, just like the vacation payout discussed here. The analysis showed I should get about $3,200 back at tax time based on my overall tax situation. The tool also suggested adjusting my W-4 at my new job to help with cash flow until then. Definitely cleared up my confusion about why the withholding was so high.

If you're trying to get answers directly from the IRS about your specific situation, good luck getting through to them. I spent WEEKS trying to reach someone about a similar withholding issue. After multiple failed attempts, I found https://claimyr.com which gets you through to an IRS agent without the endless waiting. You can see how it works here: https://youtu.be/_kiP6q8DX5c I was able to confirm that lump sum vacation payouts are indeed subject to higher withholding rates, but they're ultimately taxed at your regular income tax rate. The IRS agent explained exactly how much I could expect back at tax time and confirmed I had done the withholding calculations correctly.

I take back what I said about Claimyr. I decided to try it after my third attempt waiting on hold with the IRS for over an hour about my supplemental withholding issue. Got a call back in about 45 minutes with an actual IRS agent on the line. The agent confirmed that the high withholding rate on my lump sum payment was normal and would be reconciled when I file my taxes. Saved me from wasting another afternoon on hold just to get a simple answer.

One thing to consider is how this might affect your cash flow until you file taxes. If you're starting a new job, you could adjust your W-4 to have less tax withheld from your regular paychecks to offset the over-withholding from your vacation payout. The new W-4 doesn't have allowances anymore, but you can put an additional amount on line 4(c) that you want withheld, or you can put an amount on line 4(b) that will reduce your withholding. Just be careful not to underwithhold too much or you might face penalties.

Has anyone had success getting their employer to use the flat 22% supplemental wage withholding method instead of the aggregate method? I'm about to leave my job with a big vacation payout too and would rather not have half of it withheld.

This is a great thread - I went through something similar last year with a bonus payout. One additional tip that helped me: if you're concerned about the cash flow impact until tax season, you can also check if your state has different withholding rules. Some states have lower supplemental wage withholding rates than others, so the "48.5%" you're seeing might include both federal and state withholding combined. In my case, federal was the standard 22% supplemental rate, but my state added another 6.85%, plus FICA taxes brought the total to around 35%. It's worth breaking down your pay stub to see exactly where all that withholding is going - you might find the federal portion is actually closer to normal and it's state/local taxes pushing it so high.