Dear Liz: We plan to give our children some stock that we have had for several years. What is the tax consequence when they sell it? Is it the difference from the value when we gave it to them till they sell it, or the difference from the value when we purchased it?

Answer: If the stock is worth more the day you give it to them than it was worth when you bought it, you’ll be giving them your tax basis too.

Let’s imagine you bought the stock for $10 per share.

Say it’s worth $18 per share when you gift it. If they sell for $25, their capital gain would be $15 ($25 sale price minus your $10 basis). They will qualify for long-term capital gains rates since you’ve held the stock for more than a year.

If on the day you give the stock, it’s worth less than what you paid for it, then different rules apply. Let’s say the stock’s value has fallen to $5 per share when you gift it.

If your children later sell for more than your original basis of $10, then $10 is their basis. So if they sell for $12, their capital gain is $2.

If they sell it for less than $5 (the market value when you gave it), that $5 valuation becomes their basis. If they sell for $4, then, their capital loss would be $1 per share ($4 sale price minus $5 basis). The silver lining: Capital losses can be used to offset income and reduce taxes.

Finally, if they sell for an amount between the value at the date of the gift and your basis — so between $5 and $10 in our example — there will be no gain or loss to report.

If, however, you wait and bequeath the stock to them at your death, the shares would get a new tax basis at that point. If the stock is worth more than what you paid, your kids get that new, higher basis. So if it’s worth $25 on the day you die and they sell for $25, no capital gains taxes are owed. If it’s worth $5 when you die, though, the capital loss essentially evaporates. Your kids can’t use it to offset other income.