Most people first meet oil and gas as a royalty owner — you own minerals, you lease them, and a check shows up. A working interest sits on the other side of that same well. It's the position held by the company (or person) that actually develops the minerals: it fronts the money, carries the risk, and gets the larger share of revenue if the well succeeds.
Where a working interest comes from
It usually starts with a lease. When a mineral owner signs an oil & gas lease, they keep a cost-free royalty and hand the right to develop to the company. That right to drill and produce — the leasehold — is the working interest. The company can keep all of it, sell part of it, or partner with others, so a single well often has several working interest owners who split the costs and the revenue in proportion to what they own.
What the working interest owner pays for
There are two big buckets of cost, and the working interest carries both:
- Drilling and completion costs. The upfront cost to drill and complete the well is estimated in advance on an authorization for expenditure (AFE) — essentially a budget each working interest owner signs off on before the bit turns.
- Ongoing operating costs. Once the well is producing, there are monthly costs to keep it running — power, labor, chemicals, water disposal, repairs. These are billed to each working interest owner as a joint interest billing, in proportion to their share.
A royalty owner pays for none of this. That single fact is the whole difference between the two sides of a well.
What the working interest owner receives
Revenue from a well is paid out in a specific order. First, the royalty owners get their cost-free share. Whatever is left — the net revenue — is divided among the working interest owners. So a working interest is entitled to a bigger slice of production than any single royalty, but only after the royalties come out, and only after costs are covered.
This is why a working interest owner's actual revenue share is smaller than their cost share. If you own 50% of the working interest, you pay 50% of the costs — but you receive 50% of revenue after the royalty burden is removed. That smaller, after-royalty revenue share has its own name, the net revenue interest (NRI), and it's worth understanding on its own — see working interest vs. net revenue interest.
The risk that defines it
A royalty owner can't really lose money on a well — the worst case is the well produces nothing and they get nothing. A working interest owner can lose money, because the bills come due whether or not the well is profitable. Drill a dry hole and the working interest still owes its share of the cost. That risk is the price of the larger upside, and it's why working interests are typically held by companies and investors rather than by the original mineral owner.
Operated vs. non-operated
Not every working interest owner runs the well. One owner — the operator — actually drills and manages it day to day; the others are non-operated working interest owners who pay their share and receive their revenue without handling operations. How that relationship works is spelled out in a joint operating agreement. We cover the split in operated vs. non-operated working interest.
Frequently asked questions
What's the difference between a working interest and a royalty interest?
A working interest pays a share of costs and receives revenue after royalties; a royalty interest pays no costs and receives a share off the top. The working interest carries the risk and the bills.
Does a working interest owner pay drilling costs?
Yes — its proportionate share, budgeted on an AFE before drilling and billed monthly afterward. Royalty owners pay none of these costs.
Can a working interest lose money?
Yes. Because costs are owed regardless of profitability, a dry hole or a high-cost well can cost the owner more than it returns. That exposure is the defining risk of a working interest.
Keep going: see working interest vs. net revenue interest, what an AFE is, or compare it with a royalty interest.
Educational information only. This article is not legal, tax, or financial advice. For guidance on your specific situation, consult a licensed professional.