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IRS.gov Website
Publication 550
taxmap/pubs/p550-015.htm#en_us_publink100010250

Bond Premium Amortization(p34)

For Use in Tax Year 2013
rule
If you pay a premium to buy a bond, the premium is part of your basis in the bond. If the bond yields taxable interest, you can choose to amortize the premium. This generally means that each year, over the life of the bond, you use a part of the premium to reduce the amount of interest includible in your income. If you make this choice, you must reduce your basis in the bond by the amortization for the year.
If the bond yields tax-exempt interest, you must amortize the premium. This amortized amount is not deductible in determining taxable income. However, each year you must reduce your basis in the bond (and tax-exempt interest otherwise reportable on Form 1040, line 8b) by the amortization for the year.
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Bond premium.(p34)

For Use in Tax Year 2013
rule
Bond premium is the amount by which your basis in the bond right after you get it is more than the total of all amounts payable on the bond after you get it (other than payments of qualified stated interest). For example, a bond with a maturity value of $1,000 generally would have a $50 premium if you buy it for $1,050.
taxmap/pubs/p550-015.htm#en_us_publink1000267396
Special rules to determine amounts payable on a bond.(p34)
For special rules that apply to determine the amounts payable on a variable rate bond, an inflation-indexed debt instrument, a bond that provides for certain alternative payment schedules (for example, a bond callable prior to the stated maturity date of the bond), or a bond that provides for remote or incidental contingencies, see Regulations section 1.171-3.
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Basis.(p34)
In general, your basis for figuring bond premium amortization is the same as your basis for figuring any loss on the sale of the bond. However, you may need to use a different basis for: See Regulations section 1.171-1(e).
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Dealers.(p34)

For Use in Tax Year 2013
rule
A dealer in taxable bonds (or anyone who holds them mainly for sale to customers in the ordinary course of a trade or business or who would properly include bonds in inventory at the close of the tax year) cannot claim a deduction for amortizable bond premium.
See section 75 of the Internal Revenue Code for the treatment of bond premium by a dealer in tax-exempt bonds.
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How To Figure
Amortization(p34)

For Use in Tax Year 2013
rule
For bonds issued after September 27, 1985, you must amortize bond premium using a constant yield method on the basis of the bond's yield to maturity, determined by using the bond's basis and compounding at the close of each accrual period.
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Constant yield method.(p34)

For Use in Tax Year 2013
rule
Figure the bond premium amortization for each accrual period as follows.
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Step 1: Determine your yield.(p34)
Your yield is the discount rate that, when used in figuring the present value of all remaining payments to be made on the bond (including payments of qualified stated interest), produces an amount equal to your basis in the bond. Figure the yield as of the date you got the bond. It must be constant over the term of the bond and must be figured to at least two decimal places when expressed as a percentage.
If you do not know the yield, consult your broker or tax advisor. Databases available to them are likely to show the yield at the date of purchase.
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Step 2: Determine the accrual periods.(p34)
You can choose the accrual periods to use. They may be of any length and may vary in length over the term of the bond, but each accrual period can be no longer than 1 year and each scheduled payment of principal or interest must occur either on the first or the final day of an accrual period. The computation is simplest if accrual periods are the same as the intervals between interest payment dates.
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Step 3: Determine the bond premium for the accrual period.(p34)
To do this, multiply your adjusted acquisition price at the beginning of the accrual period by your yield. Then subtract the result from the qualified stated interest for the period.
Your adjusted acquisition price at the beginning of the first accrual period is the same as your basis. After that, it is your basis decreased by the amount of bond premium amortized for earlier periods and the amount of any payment previously made on the bond other than a payment of qualified stated interest.
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Example.(p34)

On February 1, 2012, you bought a taxable bond for $110,000. The bond has a stated principal amount of $100,000, payable at maturity on February 1, 2019, making your premium $10,000 ($110,000 − $100,000). The bond pays qualified stated interest of $10,000 on February 1 of each year. Your yield is 8.07439% compounded annually. You choose to use annual accrual periods ending on February 1 of each year. To find your bond premium amortization for the accrual period ending on February 1, 2013, you multiply the adjusted acquisition price at the beginning of the period ($110,000) by your yield. When you subtract the result ($8,881.83) from the qualified stated interest for the period ($10,000), you find that your bond premium amortization for the period is $1,118.17.
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Special rules to figure amortization.(p34)
For special rules to figure the bond premium amortization on a variable rate bond, an inflation-indexed debt instrument, a bond that provides for certain alternative payment schedules (for example, a bond callable prior to the stated maturity date of the bond), or a bond that provides for remote or incidental contingencies, see Regulations section 1.171-3.
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Bonds Issued Before
September 28, 1985(p34)

For Use in Tax Year 2013
rule
For these bonds, you can amortize bond premium using any reasonable method. Reasonable methods include:
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Straight-line method.(p34)

For Use in Tax Year 2013
rule
Under this method, the amount of your bond premium amortization is the same each month. Divide the number of months you held the bond during the year by the number of months from the beginning of the tax year (or, if later, the date of acquisition) to the date of maturity or earlier call date. Then multiply the result by the bond premium (reduced by any bond premium amortization claimed in earlier years). This gives you your bond premium amortization for the year.
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Revenue Ruling 82-10 method.(p34)

For Use in Tax Year 2013
rule
Under this method, the amount of your bond premium amortization increases each month over the life of the bond. This method is explained in Revenue Ruling 82-10, 1982-1 C.B. 46.
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Choosing To Amortize(p34)

For Use in Tax Year 2013
rule
You choose to amortize the premium on taxable bonds by reporting the amortization for the year on your income tax return for the first tax year you want the choice to apply. You should attach a statement to your return that you are making this choice under section 171. See How To Report Amortization, next.
This choice is binding for the year you make it and for later tax years. It applies to all taxable bonds you own in the year you make the choice and also to those you acquire in later years.
You can change your decision to amortize bond premium only with the written approval of the IRS. To request approval, use Form 3115. For more information on requesting approval, see section 5 of the Appendix to Revenue Procedure 2011-14 in Internal Revenue Bulletin 2011-4. You can find Revenue Procedure 2011-14 at www.irs.gov/irb/2011-04_IRB/ar08.html.
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How To Report
Amortization(p35)

For Use in Tax Year 2013
rule
Subtract the bond premium amortization from your interest income from these bonds.
Report the bond's interest on Schedule B (Form 1040A or 1040), line 1. Under your last entry on line 1, put a subtotal of all interest listed on line 1. Below this subtotal, print "ABP Adjustment," and the total interest you received. Subtract this amount from the subtotal, and enter the result on line 2.
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Bond premium amortization more than interest.(p35)

For Use in Tax Year 2013
rule
If the amount of your bond premium amortization for an accrual period is more than the qualified stated interest for the period, you can deduct the difference as a miscellaneous itemized deduction on Schedule A (Form 1040), line 28.
But your deduction is limited to the amount by which your total interest inclusions on the bond in prior accrual periods is more than your total bond premium deductions on the bond in prior periods. Any amount you cannot deduct because of this limit can be carried forward to the next accrual period.
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Pre-1998 election to amortize bond premium.(p35)

For Use in Tax Year 2013
rule
Generally, if you first elected to amortize bond premium before 1998, the above treatment of the premium does not apply to bonds you acquired before 1988.
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Bonds acquired before October 23, 1986.(p35)
The amortization of the premium on these bonds is a miscellaneous itemized deduction not subject to the 2%-of-adjusted-gross-income limit.
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Bonds acquired after October 22, 1986, but before 1988.(p35)
The amortization of the premium on these bonds is investment interest expense subject to the investment interest limit, unless you choose to treat it as an offset to interest income on the bond.