Borrowing Base Redeterminations: An Operator's FAQ

By MercFinancial · Published 2026-07-18

A plain-English walk-through of what happens at a borrowing base redetermination: the process, the price deck, deficiency cures, and when to refinance.

At a borrowing base redetermination, your reserve-based lender re-values your proved oil and gas reserves using an updated engineering report and the bank's current price deck, then resets the maximum line of credit — your borrowing base — to match that new value. If the recalculated value comes in below your existing base, you're handed a deficiency and a defined cure period to close the gap: a cash sweep, a partial paydown, additional collateral, or a hedge restructuring. If it comes in higher, your available credit simply increases. Either way, the redetermination doesn't touch draws you've already made or your interest rate directly — it resets the ceiling you can borrow against going forward.

For operators who've never been through one, the process can feel opaque and a little ominous — a bank you don't control is about to decide, twice a year, how much operating capital you get to run your company on. That anxiety is fair; a meaningful cut can force asset sales or trigger a scramble for bridge capital at the worst possible time. But the process itself is mechanical and predictable once you understand what's actually being reviewed.

This FAQ covers how redeterminations work, what drives a reduction, how deficiency cures play out, and what to do before your next one — including when the smarter move is refinancing with a lender whose price deck fits your asset base better. For a primer on reserve-based lending itself, see How Reserve-Based Lending Works for Oil Producers.

"Our base dropped by nearly a third last spring, right when we needed capital for two workovers. I didn't even know 'deficiency cure' was a real term until my banker used it on the call."

The Short Answer: Your Lender Re-Values Your Reserves and Resets Your Credit Limit

A reserve-based loan (RBL) is secured by the value of your proved reserves still in the ground, not by a fixed dollar amount of collateral. That value moves constantly with commodity prices, production performance, and drilling results — so lenders can't set your credit limit once and leave it alone. Instead, they recalculate it on a schedule. That recalculation is the redetermination.

The lender's engineering group (or a third-party firm they hire) runs your updated reserve report through their internal price deck and lending formulas, applies advance rates by reserve category (higher for proved developed producing, lower for proved undeveloped), and arrives at a new borrowing base number. Your credit agreement then amends to that figure — the loan's collateral and covenant structure stay the same; only the number on the credit line moves.

When Redeterminations Happen — Scheduled, Interim, and Lender-Requested

Most reserve-based credit agreements build in two scheduled redeterminations a year, commonly called the spring redetermination and the fall redetermination. Spring typically uses year-end reserve data; fall uses a mid-year update. The exact months vary by lender and by your fiscal reporting cadence, but semi-annual is the market standard for bank RBLs.

Outside that fixed schedule, three other triggers can pull a redetermination forward:

• Interim redeterminations — many credit agreements let either party call one extra redetermination between scheduled dates, often after a major acquisition, divestiture, or a sharp commodity price move.
• Material event triggers — a large asset sale, a new hedge program, or a borrowing-base-affecting acquisition can obligate an off-cycle review under the agreement's terms.
• Lender-requested reviews — production materially underperforming the reserve report, a covenant near breach, or a price crash outside the normal deck cycle can prompt an unscheduled look.

What the Lender Reviews: Updated Reserve Report, Price Deck, Hedges, and LOE

Four inputs drive the new number, and understanding each one tells you where you have leverage and where you don't.

Your updated reserve report

Your engineer (in-house or third-party) submits current production, decline curves, and remaining reserves by category — proved developed producing, proved developed non-producing, and proved undeveloped. Lenders apply steep discounts to PUDs and non-producing categories, so a base heavy in undeveloped locations always carries more redetermination risk than one built on flowing wells.

The bank's price deck

This is the part borrowers control least. Each lender maintains its own forward price curve, updated quarterly or semi-annually off the NYMEX strip, and every reserve report gets run through it regardless of what prices you personally expect. A softer deck this cycle mechanically lowers the value of every barrel and Mcf in your report, even with flat production. See How WTI Price Swings Change Your Borrowing Capacity for how deck movements translate into base movements.

Your hedge book and LOE trend

Hedged production is generally valued more favorably because it locks in cash flow certainty the lender can underwrite with confidence — a thin or absent hedge program going into redetermination season removes one of the few levers you actually control. Rising lease operating expense per barrel does the opposite, eating into the net cash flow the lender discounts even at flat production and flat prices.

If Your Borrowing Base Gets Cut: Deficiency Cure Options Explained

If the new base comes in below your outstanding balance, you have a borrowing base deficiency. Credit agreements almost always give you a defined cure period — commonly 30 to 180 days depending on the lender — rather than demanding immediate repayment. The standard cure mechanisms are:

None of these are pleasant, but a deficiency is not a default by itself — it's a contractual mechanism the credit agreement anticipates. The real risk is running out of cure options simultaneously, which is usually what pushes operators toward refinancing rather than curing in place.

How to Prepare in the 90 Days Before a Redetermination

Operators who go into redetermination season prepared consistently fare better than those who treat it as something that happens to them. In the quarter before your scheduled review:

• Get your reserve report current and defensible. Stale production data or an engineer's report that hasn't kept pace with your drilling results works against you — make sure your numbers reflect reality, not last year's assumptions.
• Review your hedge coverage against the redetermination window, not just the calendar year. A hedge that expires right after your review does little to support the valuation itself.
• Model your own base using the lender's likely price deck. Most lenders will share their deck or a close approximation on request — running your own numbers first removes the surprise factor.
• Get ahead of any LOE spikes with an explanation ready. A workover is very different from a structural cost problem, and the lender wants to know which one they're looking at.
• Line up a contingency plan before you need one. Knowing your JIB receivables, unencumbered acreage, or outside lender relationships in advance turns a deficiency into a manageable event rather than a fire drill. A working capital bridge — through JIB factoring or a short-term facility — can cover a gap while a longer-term fix is arranged.

For a fuller breakdown of what lenders across the reserve-based and non-bank space actually want to see in your data room, see What Oil and Gas Lenders Look For: A Data Checklist.

When a Redetermination Is the Signal to Refinance With a Different Lender

Not every deficiency is a sign you did something wrong — sometimes it's a sign your current lender's price deck, reserve mix appetite, or risk tolerance has simply drifted away from your asset base. A bank that's pulling back across its entire energy book because of its own portfolio concentration will cut your base regardless of how well you're operating. That's a lender problem, not an operator problem, and it's usually a better signal to shop the loan than to keep absorbing cuts.

MercFinancial works as a brokerage, not a direct lender, so when a redetermination goes badly we're not limited to whatever one bank's committee decides this cycle. We place reserve-based and asset-based oil and gas financing across a wholesale network of 160+ lenders — some more aggressive on PUD advance rates, some friendlier to smaller producing packages, some simply running a less punitive price deck this year. If your current facility is shrinking every cycle regardless of your operating performance, that's worth a second opinion before your next review, not after a deficiency notice arrives. Explore the full range of structures on our oil and gas funding page, and if the gap is smaller than a full RBL refinance, our broader business funding programs can bridge the timing.

Frequently Asked Questions

How often do borrowing base redeterminations happen?

Most reserve-based credit agreements schedule two redeterminations a year — the spring and fall redeterminations — timed around year-end and mid-year reserve reports. Interim redeterminations can also be triggered by a major acquisition, divestiture, sharp price move, or a lender-requested review outside the normal schedule.

What causes a borrowing base to be reduced?

A base typically shrinks from some combination of a lower price deck, production underperforming the prior reserve report, rising lease operating expenses cutting into net cash flow, or a thinner hedge book reducing underwriting certainty. It can also drop because your reserve mix has shifted toward less-developed categories that lenders discount more heavily.

What is a borrowing base deficiency and how do I cure it?

A deficiency occurs when your new borrowing base falls below the amount you currently have drawn. Credit agreements generally provide a defined cure period — often 30 to 180 days — during which you can cure through a cash sweep or installment repayment, a lump-sum paydown, pledging additional collateral or reserves, or negotiating a hedge or covenant amendment.

Can I dispute my lender's price deck at redetermination?

You can raise it, and some lenders will discuss their assumptions or share the deck itself, but the price deck is generally a bank-wide policy applied uniformly across their energy portfolio rather than negotiated loan-by-loan. If a lender's deck is consistently more conservative than the market's, that's a stronger argument for refinancing than for disputing a single review.

Should I refinance before my next redetermination?

If your borrowing base has been cut in back-to-back cycles despite stable or improving operations, or your lender's risk appetite for your reserve mix has clearly narrowed, getting a second opinion on your financing before the next review — rather than after a deficiency notice — puts you in a stronger negotiating position.

This article is for educational purposes only and is not financial advice. Loan programs, rates, and approvals vary by lender and borrower profile.