My husband recently started making independent contractor income that does not have tax withheld at the very end of May. He's only gotten 3 independent contractor paychecks so far this year and at this time we really don't have a solid idea as to what his income for the next 6 months will be.
How do we figure out what we need to pay in estimated tax payments for the 7.5 months of independent contractor income so we don't incur penalties?