Just read the 2023 forms and rates. I'm a bit high.
Single with exemption like most retirees without government pension:
65k x 12 = 780,000. 780,000 - 150,000 exemption = 630,000. Between 500k and 750k the tax rate is 12,500 plus 15% tax on amount over 500k. 630,000 - 500,000 = 130,000. 130,000 x .15 = 19,500. So simple tax would be 12,500 + 19,500 = 32,000.
Single without exemption:
780,000. Between 750k and 1m tax rate is 65,000 plus 20% on income over 750k. Same math as above gives a tax rate of 65,000 + 6000 = 71,000.
Just a cursory read. Obviously other income streams are taxed at different rates. Clarification by mid-June 2024 would be nice.