Best Way to Estimate RSU Taxes Before Vesting

[letep]

Hi everyone,

I’m looking for advice on estimating taxes for my upcoming RSU vesting schedule. My company hasn’t clearly explained how much will be withheld, so I started searching online and found the RSU Tax Calculator which seems useful for quick estimates.

Still, I’m unsure whether these calculators take into account federal, state, and supplemental tax rates correctly or if they just give a rough idea. If anyone has experience using RSU calculators for planning or budgeting, I’d love to know how reliable they are in real situations and whether you adjust your estimates manually.