What proportionate reduction does

Proportionate reduction is a scaling clause. If an assignment of overriding royalty grants “2% of 8/8” but the assignor only owns a 50% working interest, the override that actually burdens production is typically half of that printed number — unless the instrument says otherwise. The same idea shows up in oil and gas leases when the lessor does not own 100% of the minerals.

Buyout packets still quote one cash line for unlike decimals. The cover letter’s override percent is a working number, not a title opinion. Read the proportionate reduction paragraph before you treat the envelope like a mineral deed sale of fee minerals. This page is not legal advice. Mineral Vertex buys royalty interests and matches owners with buyers.

Copies of the assignment or lease — proportionate reduction language included — plus a recent stub if you have one are enough to start. Do not notarize their form because the printed percent looks large. We do not promise to beat every letter.

Where proportionate reduction shows up

• ORRI assignments — the override is carved from the working interest the assignor actually owns, not from a theoretical 100% WI. See assignment of overriding royalty.
• Leases — bonus and royalty are often paid on net mineral acres, not on the gross acres in the caption. Pooling can shrink your share again.
• Royalty deed / NPRI — a fraction “of 8/8” vs “of the lease royalty” is a different product. See Royalty deed / NPRI.
• Division orders — the pay deck is where proportionate reduction becomes a decimal you can bank. A stub is evidence, not a title opinion.

What the clause does not fix

• It does not set a fair price. A reduced override can still be worth selling — or worth keeping. That is a second number, not a reason to skip one.
• It does not make recording reversible. Once the assignment records, unwinding it is a title fight.
• It does not replace a lease call, wellbore limit, or depth severance. Those still decide what is actually burdened.
• Location still changes the number. Match the county on the oil and gas map.

If the same envelope is a mineral deed offer, treat each instrument on its own. Then send proportionate reduction here — meaning the assignment or lease that contains it — so we can try an offer, a buyer match, or a counter.