How $188,000 of Well Income Lets a $700,000 Drilling Deduction Clear the $512,000 Cap
The $512,000 cap on a 2026 joint return is measured after business income. For a repeat drilling investor, the wells already producing can decide how much of the next deduction lands this year.
A large drilling check can put a $700,000 loss on the K-1 while the return lets only $512,000 of it reach your wages this year. The cap is real, but it measures something narrower than the K-1 suggests.
The excess business loss limit tests your net business loss, after business income. Income from wells you already own counts on the income side, so an investor in a second or third program can deduct more than a first-time investor writing the same check.
1. The cap measures a net figure
Section 461(l)(3)(A) defines the excess business loss as your business deductions for the year minus the sum of your business gross income and the threshold. For 2026 the threshold is $512,000 for married couples filing jointly and $256,000 for everyone else, under Rev. Proc. 2025-32.
Two parts of that definition matter for a drilling investor. Wages are left out entirely, because the excess is figured "without regard to any deductions, gross income, or gains attributable to any trade or business of performing services as an employee." And all of your trades or businesses go into one pool, so a profitable one raises the room for a loss from another.
2. Older wells are business income
A working interest in a producing well throws off net income once the drilling is paid for. When a program reports that income on your K-1 as trade or business income, it lands on the income side of the §461(l) test, right next to this year's drilling deductions.
That changes how a repeat investor should size the next check. The first program faces the cap with nothing to offset it. By the third, the wells from the first two can be producing enough business income to absorb part of the new program's loss before the threshold is even reached.
3. The same $700,000 deduction, with and without producing wells
A couple filing jointly earns $800,000 in wages. In December 2026 they put $1,000,000 into a new program as general partners, and its budget puts $700,000 of IDC on their 2026 return. They hold general partner units, so the loss is non-passive, their cash covers the basis and at-risk limits, and drilling starts by March 31, 2027.
First program, nothing producing
Business deductions (IDC): $700,000
Business income: $0
Net business loss: $700,000
Allowed against wages, up to the threshold: $512,000
Carried forward as a net operating loss: $188,000
Third program, earlier wells producing
Business deductions (IDC): $700,000
Net business income from earlier programs: $188,000
Net business loss: $512,000
Allowed against wages, up to the threshold: $512,000
Carried forward: $0
In the second case the full $700,000 deduction is used in 2026. $188,000 of it offsets the income from the older wells, and the remaining $512,000 offsets wages. In the first case the same $188,000 waits a year.
4. What happens to the $188,000 that waits
Under §461(l)(2), the disallowed amount is treated as a net operating loss carryforward. In 2027 it is deducted under §172, and the §461(l) test for 2027 is computed "without regard to any deduction allowable under section 172," so the carryforward does not use up next year's $512,000 of room.
The limit that does apply is §172's. A carryforward from a year after 2017 can offset at most 80% of taxable income figured before the NOL deduction. For a couple with $800,000 of wages that rarely binds, so the real cost of the cap here is a year's delay on $188,000.
5. Other losses share the same $512,000
The pool is the whole return, both spouses included on a joint return. A cost segregation loss on a short-term rental that qualifies as non-passive, a loss from an operating business and the drilling deduction all draw on one threshold. It is easy to model a drilling program and a rental purchase separately, each against the full $512,000, and miss that the combined number is capped.
The equipment share adds to the same pool a year later. If the wells go into service in 2027, 100% bonus depreciation on the equipment becomes a 2027 business deduction, and it competes with whatever else is on that year's return.
6. Ways to stay under the line
- Count the income side first. Pull last year's K-1s from earlier programs and estimate this year's net business income before you size the new check.
- Time the second purchase. If a rental with a cost segregation study is planned for the same year, moving one of the two into the next tax year can keep both under the threshold.
- Use partial amortization when it fits. A §59(e) election moves some or all of a partner's IDC onto a 60-month schedule, though an NOL is usually used sooner.
- Look up the threshold every year. It is indexed for inflation, and the 2026 figures are lower than 2025's because the 2025 law reset the base year.
The excess business loss calculator tests your own numbers against the threshold. When the check is large, we pull the K-1s from your earlier programs and the rest of the return, size the investment so as much as possible lands this year, and file it. Book a call with last year's return and every K-1 you received.
General information, not tax advice for your situation. Figures are federal and current as of November 2026, and the treatment of K-1 income depends on how each program reports it.
Frequently asked
Questions, answered
Does K-1 income from producing wells raise the excess business loss limit?
It raises the room for losses, not the threshold itself. Net income a program reports as trade or business income is added to the income side of the test, so a new drilling loss first offsets that income and only the remainder is measured against $512,000 on a joint return.
Does my salary give me more room under the cap?
No. The statute leaves out anything attributable to performing services as an employee, so a salary never adds room. A business loss can still reduce taxable wages, just never by more than the threshold.
Does last year's disallowed amount use up this year's $512,000?
No. It comes back as a net operating loss deduction under section 172, and the cap computation ignores section 172 deductions. The carryforward is limited instead to 80% of taxable income before the NOL deduction.
Do my spouse's business losses share my threshold?
Yes, on a joint return. All of the couple's trades or businesses are aggregated, so a spouse's rental or operating loss and your drilling deduction draw on the same $512,000.
Should I spread IDC over 60 months to avoid the cap?
Usually not. Section 59(e) allows a partner to amortize some of their IDC across 60 months, but an amount pushed out by the cap returns as an NOL the next year, which is normally faster.