Dear Liz: Last year I bought an electric vehicle, motivated in part by the $7,500 federal tax credit. I consulted with my tax preparer, a CPA, to ensure I would generate enough income to fully use the one-time, use-it-or-lose-it credit. In December 2011, I informed her of the exact type of that year’s income (earned income, capital gains, dividends, interest and so on) and detailed all my deductions. She assured me that based on those numbers my tax burden was $8,600, more than sufficient to use the credit. It was enough, in fact, that I could use more deductions and losses, so I made some charitable contributions and sold a losing investment. The final numbers were very close to the estimates she received from me in December. Now that she has completed my federal tax return, however, my tax burden turns out to be far less than she estimated. In fact, it’s zero. Ordinarily I’d be delighted, but I specifically consulted with her to ensure I had a large-enough tax burden to use up the credit. I could have sold some winning investments to generate a bigger tax burden, but have now lost that credit forever. So far she has not responded fully to questions about what happened, and I now suspect she may simply have guessed at the tax burden and not run the numbers through any tax preparation software. I feel that she has in effect cost me $7,500. Am I right to be aggrieved and do I have any recourse?

Answer: Of course you’re right to be aggrieved. One of the reasons to hire a tax professional is to get good advice about managing your tax bill.

Human beings make errors, of course. No one is perfect. But it’s disturbing that your CPA hasn’t told you clearly why she made the mistake she did or, apparently, offered any kind of recompense.

When tax pro mistakes cost you money, it’s typically because the preparer underestimated your tax burden and the IRS catches the error. In that case, your tax pro shouldn’t be expected to pay the extra tax, since you would have owed the money anyway if she’d done the return correctly. But many tax preparers will offer to pay any penalties or interest the taxpayer owes because of their errors, said Eva Rosenberg, an enrolled agent who runs the TaxMama.com site.

In this case, of course, your pro overestimated your tax burden, ultimately costing you a valuable credit. You could always ask her to compensate you for some or all of that lost credit. At the very least, she should be willing to refund any fee she charged you for her advice, Rosenberg said.

You may want to review your own behavior to make sure you didn’t contribute to this situation. Given the amount at stake, you should have called to set up a formal appointment in which the two of you could go over the numbers and your previous year’s tax return, if she didn’t prepare it. That would ensure she had enough information to make a reasonable prediction. If instead you called her up with a “quick question” — tax questions are rarely quick, by the way, and the answers almost never are — then you helped set yourself up for a disappointing outcome.

In any case, you should find another tax pro, since this incident — and her handling of it — indicates she’s not quite up to the job of being your advisor.