Donate tax-exempt у USA
These US non-profit organizations help Ukraine. All of them are tax exempt according to US code 501(c)(3), so donations can be tax deductible for donors at the moment of writing this article. Check them here https://apps.irs.gov/app/eos/ by name or EIN provided after each link, also you can read big IRS article for general IRS rules about donations or Investopedia for less complex information. You are welcome to make tax-deductible donation to support Ukraine using any of them.
https://usukrainianactivists.org/ - US Ukrainian Activists, Inc. EIN 85-0784959
https://unitedhelpukraine.org/ - United Help Ukraine, EIN 47-1837509
https://www.razomforukraine.org/donate/ - Razom for Ukraine, EIN 46-4604398
https://www.leleka.care/ - Leleka Foundation, EIN 47-2377309
https://www.jrnu.org/ - Jewish Relief Network Ukraine, EIN 88-2131119
https://www.sunflowerofpeace.com/ - Sunflower of Peace, EIN 47-2620675