Who needs to pay quarterly?
Most often, self-employed people, including some persons involved in the
sharing economy, need to pay quarterly installments of estimated tax. Similarly, investors, retirees and others – a substantial portion of people whose income
is not subject to withholding –
often need to make these payments as well. Besides self-employment income, other income generally not subject to withholding includes interest, dividends, capital gains, alimony and rental income.
Because the U.S. federal income tax is a pay-as-you-go tax, taxpayers are required to pay the tax as they earn or receive income during the year. If a taxpayer didn’t pay enough tax during the year, either through withholding or by making estimated tax payments, the taxpayer may normally have to pay a penalty.
Recent major tax law changes affect most taxpayers, and while the vast majority are on track to receive a refund, others are finding that they owe on their taxes. Many taxpayers who owe for 2018 may qualify for a
waiver of the estimated tax penalty that normally applies.
All of my incomes are subject to withholding tax.