Your can find your AGI for 2023 by looking at Line 11 on Form 1040, 1040-SR and 1040-NR. You can also on the Turbo Tax Home page after you sign in go to Your Tax Returns and Documents and looking at 2023 click on Adjusted Gross Income.
The Safe Harbor Rule for Estimated tax payments was written in the answer above. I am copying it for visibility:
- You pay at least 90% of the tax you owe for the current year, or 100% of the tax you owed for the previous tax year (This rule is altered slightly for high-income taxpayers. If the Adjusted Gross Income (AGI) on your previous year’s return is over $150,000 (over $75,000 if you are married filing separately), you must pay the lower of 90% of the tax shown on the current year’s return or 110% of the tax shown on the return for the previous year.), or
- You owe less than $1,000 in tax after subtracting withholdings and credits
Be well and safe @Bissawo
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