If I received all this fellowship during the 3rd and 4th quarters (and it turns out that I do need to pay quarterly estimated payments), then how does the IRS know that I received this income during the 3rd and 4th quarters? I did not know that this stipend would be in fellowship form earlier in the year, so I couldn't possibly have paid estimated tax payments during the 1st and 2nd quarters. So will I be penalized for these quarters too, if the IRS is only interested in total annual amounts? My understanding was that you only send quarterly payments with no forms indicating your income for that quarter - the payments are based on your total estimated annual income.
Thank you for your help.
