The requirement to pay quarterly estimated taxes applies to every taxpayer. There are several tests. The easiest one is whether you expect to owe over $1000 in Federal taxes. If you do, you should pay quarterly estimated taxes to bring down the April 2020 liability for Tax Year 2019 to under $1000. If you end up owing more than $1000, you are likely to also owe penalties and interest to the IRS. If you had $500,000 in the bank earning 1% interest, you would earn $5000. If y9u are in the 25% tax bracket, you would owe $1250 in taxes. You should have made quarterly estimated payments. It doesn't matter where the money came from (interest, dividends, salary, mystery shopping), it is the amount of money earned and the tx liability that matters.
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