Calculating estimated taxes following death of spouse
Scenario: A husband & wife were filing jointly with quite high income due to husband's annuities. They always used the 110% calculation for estimated taxes. Husband died in Oct '23 and annuities ended with his death. Wife's '24 taxable income will be substantially lower, perhaps having close to zero tax. Does she need to calculate her '24 estimated taxes based on their '23 tax or can she estimate based on her expected very low '24 income? Want to be sure there won't be a penalty for not paying at least 90% of the 2023 tax.