Avoid these simple tax mistakes

This week, it’s just a mish-mash of various common mistakes or misconceptions I’ve run across that you would be wise to steer clear of.

  1. Are you a registered domestic partner in California? If one partner’s employer provides health insurance to the other partner, this is unfortunately taxed as income on the federal tax return. However, California provides a deduction on the state return for this amount, and other states that have same-sex spouses and registered domestic partners may allow it as well. Check your state law. In California, it’s a subtraction from wages (reported on Line 7 of Schedule CA). And depending on your income and the cost of health insurance, this can save you several hundred dollars on your tax bill. NOTE: Many tax professionals miss this little-known deduction, so even if you had a professional do your taxes, you should double-check that they caught this.
  2. Do you pay for your own health insurance and receive income as an independent contractor? Make sure you deduct that health insurance. In general, medical costs must exceed 10% of income to be deductible, so many people just ignore these costs on their tax return. But in the special case of health insurance and self-employment earnings, you can actually take a deduction for the entire cost of health insurance in most cases.
  3. Did you sell stock or other assets? Many people who don’t frequently sell stock or other assets, or who received it as a gift or inheritance, don’t know what their cost basis is in the asset. As a result, they pay much more tax on the sale than they should. Your cost basis is generally what you paid for the stock; plus the value of reinvested dividends. If you received stock from your employer, your cost basis is the amount that was reported as income on your W2. (Frequently this is the Fair Market Value of the stock, minus any amount you actually paid, on the exercise date.) If you received assets as a gift, your basis is whatever the donor’s basis was. And if you inherited assets, your basis is generally the Fair Market Value of the asset on the date of death of the decedent.
  4. Look closely for withholding on 1099 statements. Most people catch withholding on their W-2, but sometimes taxes are withheld on pension/IRA distributions (1099-R), unemployment (1099-G), Social Security payments (SSA-1099), and occasionally even interest payments or proceeds from stock sales (1099-INT and 1099-B). Don’t forget to take credit for these payments you’ve already made to the government! No need to pay the same tax twice.

These are just the most common mistakes I’ve seen in the last week or two. In my experience, the majority of self-prepared tax returns contain one or more mistakes. More often than not, they’re minor oversights like #4. These can be eliminated by simply carefully examining all of your tax documents, and carefully reading each screen if you’re using tax software. However, occasionally, there are deductions or credits that aren’t widely known and the software doesn’t do a great job of telling you about (like #1).  In these cases, a professional review is probably your best bet to uncover the mistake.


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