Where Does a Gain on Sale of Assets Go on a Business Return?

The book number is not the tax number

A client's trial balance shows a gain or loss on disposal computed from book basis: original cost less book accumulated depreciation.

The return computes it from tax basis, which reflects MACRS, section 179 and bonus depreciation. An asset fully expensed under section 179 has zero tax basis, so a sale produces gain equal to the entire proceeds even where the books show a modest gain or a loss.

So the book figure is not entered as income. The disposal is reported on Form 4797, the tax gain is computed there, and the difference between the two belongs on Schedule M-1.

Where it lands

Net gain or loss from Form 4797, Part II, line 17 carries to page 1: line 9 on Form 1120, line 4 on Form 1120-S, line 6 on Form 1065.

Section 1231 gains and losses behave differently on a pass through return: they are separately stated on Schedule K rather than folded into ordinary business income, because the netting happens at the owner level.

Recapture is the part clients do not expect

Depreciation taken on an asset comes back as ordinary income on a sale, through Form 4797 Part III, up to the amount of depreciation claimed. It is not capital gain.

That is the mechanism that makes a section 179 election feel expensive years later: the deduction was ordinary, and the recapture is ordinary. A client who expects capital gain treatment on selling equipment usually has not been told about recapture.

The balance sheet side

A disposal moves three Schedule L figures at once: the asset cost comes off line 10a, the accumulated depreciation comes off line 10b, and the proceeds land in cash. On a 1065 those asset lines are 9a and 9b.

Recording only part of that is one of the more common causes of a balance sheet that will not tie, and the giveaway on a trial balance is accumulated depreciation that has crept close to the gross asset total.