Jt is not sufficient to meet the 110% of prior tax or 90% of current tax rules.
IRS requires you to estimate your total tax for the year and pay as you go (i.e. estimated tax)
Assuming you have no W-2 withholding nor other withholding,
you can base your estimate on prior year's tax , or 90% of this year's tax, whichever is smaller.
each quarter your estimated tax paid and tax withheld must be at least 25% of the estimate, even if your income is uneven, this is the simplified method.
if your estimate is based on this year's tax and turns out to be wrong you may be penalized.
you can compensate by overestimating.
if your estimate is based on prior year's tax, you know that when you file by April 15, which is also the first estimated tax payment due date. How convenient.
the 25% factor means your payments are consistently spread out. this is the default calculation used by IRS to calculate penalties.
Other calculations are possible but add complexity to your tax filing.
@cspyon
