yep, i had to pay this year (1st time in years), and it knocked my upgrade plans right out of the tree.
basically, i paid H&R to do my taxes last year, because i had just purchased a house earlier that year, and wanted to get a good baseline for future returns done by myself...
they told me i could raise the number of deductions on my w4 so i would zero out at the end of the year...
but erroneously based their math on using my one time write off of tax-deductable donations (we gave away a huge amount of furniture and clothes when we moved into the new smaller house) and it threw the whole thing off.,
i went back and re-did the math after the fact, to figure out what happened, and i did, but i never should have taken H&r's numbers at face value.
ends up, i could have figured it out myself, more correctly, and saved myself the cost of the return last year and the tax bill this year.
oh well, live and learn.