Capital gains, basis, and the step-up — selling minerals.

A sale is capital; the monthly checks are ordinary

Two different tax treatments sit side by side here. The royalty checks you receive while you hold minerals are generally taxed as ordinary income each year (softened a little by a depletion allowance). Selling the minerals outright, by contrast, is generally a sale of a capital asset — taxed at long-term capital-gains rates if you’ve held them more than a year, which for most people is meaningfully lower than ordinary rates.

That difference is part of why some owners sell: it can convert a stream of ordinary-income checks into a single capital event. Whether that helps you depends entirely on your own bracket and situation.

Basis is the number that decides your gain

Your taxable gain is roughly the sale price minus your cost basis. For minerals that have been in the family for generations, that original basis is often very low or effectively zero — so nearly the whole sale price can be gain. If you’ve claimed depletion against royalty income over the years, that further reduces your basis. Knowing your basis before you sell is what makes the tax bill predictable instead of a surprise.

The step-up: the big break on inherited minerals

Here’s the one that saves families real money. When you inherit minerals, your basis is generally “stepped up” to the fair market value as of the date of death — not what your grandparent paid. If you sell shortly after inheriting, your gain may be small or even zero, because the sale price and the stepped-up basis are close together.

This is why a defensible date-of-death valuation is worth getting, and why inherited minerals are often a cleaner sale, tax-wise, than long-held ones. It’s also why rushing to sell before establishing that basis can be a costly mistake.

Inherited minerals usually reset to today’s value for tax purposes. Sell soon after, and there may be little gain to tax at all — but only if your basis is documented.

Can a 1031 exchange defer the tax?

Sometimes. Mineral and royalty interests are generally treated as real-property interests, so a properly structured 1031 like-kind exchange can, in many cases, defer the capital gain by rolling proceeds into other qualifying real property. The rules are strict — timelines, qualified intermediaries, like-kind requirements — and not every interest or transaction qualifies, so this is firmly a “plan it with your CPA and a 1031 specialist first” move, not a DIY one.