If you purchased a taxable bond for more than its face value—as you might have to capture a yield higher than current market rates deliver—Uncle Sam will effectively help you pay that premium. That’s only fair, since the IRS is also going to get to tax the extra interest that the higher yield produces.
You have two choices about how to handle the premium.
You can amortize it over the life of the bond by taking each year’s share of the premium and subtracting it from the amount of taxable interest from the bond you report on your tax return. Each year you also reduce your tax basis for the bond by the amount of that year’s amortization.
Or, you can ignore the premium until you sell or redeem the bond. At that time, the full premium will be included in your tax basis so it will reduce the taxable gain or increase the taxable loss dollar for dollar.
The amortization route can be a pain, since it’s up to you to both figure how each year’s share and keep track of the declining basis. But it could be more valuable, since the interest you don’t report will avoid being taxed in your top tax bracket for the year—as high as 43.4%, while the capital gain you reduce by waiting until you sell or redeem the bond would only be taxed at 0%, 15% or 20%.
If you buy a tax-free municipal bond at a premium, you must use the amortization method and reduce your basis each year . . . but you don’t get to deduct the amount amortized. After all, the IRS doesn’t get to tax the interest.
Don’t Unnecessarily Report a State Income Tax Refund