Here's one easy-access reference to both 2020 and 2021 tax brackets (though 2021 could change)
https://www.bankrate.com/finance/taxes/tax-brackets.aspx
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Remember, that only the $$ that slop into the next tax bracket get taxed at the next higher rate...so if you miss-estimate some, it might not hit you too hard.
Other income estimates to consider.....Fidelity and Vanguard (and likely other Mutual fund brokers) distribute capital gains, mostly in December every year. I know both Fidelity and Vanguard now have their "estimates" of what they plan to distribute for their funds. For mine, they are approximately double what they distributed last year, but it will vary widely depending on what funds you own. So if you have significant holdings in Mutual funds, be sure to research and take those estimated distributions into account.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
