I.R.C. § 1060(a)(2) — the gain or loss of the transferor with respect to such acquisition, the consideration received for such assets shall be allocated among such assets acquired in such acquisition in the same manner as amounts are allocated to assets under section 338(b)(5).
A common rule of thumb is 100 minus your age to determine your allocation to stocks. For example, if you are 30, then you'd allocate 70% to stocks and 30% to bonds (100 - 30 = 70). If you are 60, you'd allocate 40% to stocks and 60% to bonds (100 - 60 = 40).
Many financial advisors recommend a 60/40 asset allocation between stocks and fixed income to take advantage of growth while keeping up your defenses. Here's how 60/40 is supposed to work: In a good year on Wall Street, the 60% of your portfolio in stocks provides strong growth.
The seller usually seeks to maximize amounts allocated to assets that will result in capital gains tax while minimizing amounts allocated to assets that will result in ordinary income taxes.
A penalty may be imposed for failure to file Form 8804 when due (including extensions). The penalty for not filing Form 8804 when due is usually 5% of the unpaid tax for each month or part of a month the return is late, but not more than 25% of the unpaid tax.