Business interest limit exempts most small businesses

Key takeaway: Under the One Big Beautiful Bill Act, most small businesses are fully exempt from the Section 163(j) business interest deduction limit. Any company other than a tax shelter with average annual gross receipts of $31 million or less over the prior three years can deduct its business interest in full. The Act also makes the more generous EBITDA-based limit permanent for companies above that threshold, effective for tax years beginning after December 31, 2024.

A permanent interest limit with a broad carve-out

The One Big Beautiful Bill Act delivers two important changes to the business interest deduction at once. It makes the more generous EBITDA-based limitation permanent, and it preserves a broad exemption that shields the overwhelming majority of small businesses from the limitation entirely. For most owner-operated companies, the practical result is that the interest limit simply does not apply.

The business interest limitation under Section 163(j) restricts how much interest expense a company can deduct in a given year. The rule was designed to target large, highly leveraged enterprises, not the typical small business financing equipment, inventory, or expansion. The One Big Beautiful Bill Act keeps that targeting intact by maintaining the small-business exemption tied to a gross receipts test.

Understanding whether your company falls inside or outside the limit is one of the most consequential planning questions under the new legislation. A business that qualifies for the exemption can deduct its full interest expense without restriction, while a business above the threshold must perform the more complex limitation calculation reported in line with Publication 535, Business Expenses.

This article explains the exemption, the gross receipts test that defines it, how the calculation works for businesses above the line, and the planning moves available to companies near the threshold.

How the One Big Beautiful Bill Act changed Section 163(j)

The One Big Beautiful Bill Act amends Section 163(j) to apply the interest deduction rules to taxable years beginning after December 31, 2024, and it makes the EBITDA-based limitation permanent. This is a meaningful improvement over the prior framework, which had shifted to a stricter EBIT-based calculation that ignored depreciation and amortization.

Under an EBITDA-based limit, a business adds back Depreciation and amortization when computing the income figure used to cap interest deductions. Because that add-back increases the allowable base, capital-intensive companies can deduct substantially more interest than they could under the harsher EBIT approach.

The headline changes include:

• The EBITDA-based limitation is now permanent rather than scheduled to expire
• The rules apply to tax years beginning after December 31, 2024
• New coordination provisions address capitalized interest under specific code sections
• The small-business exemption tied to the gross receipts test remains fully in place

For the large multinationals affected by the limit, the Act also refines the definition of adjusted taxable income so that certain foreign inclusions no longer inflate the base. For small businesses, however, the most important point is simpler. If you meet the gross receipts test, none of these calculations apply to you at all.

Who qualifies for the small business exemption

The exemption hinges on the Section 448(c) gross receipts test. A business is exempt from the Section 163(j) interest limitation if its average annual gross receipts for the three prior tax years are $31 million or less, using the 2025 inflation-adjusted threshold. Any taxpayer meeting this test, other than a tax shelter, can deduct its business interest in full.

This threshold is high enough to cover the vast majority of American companies. A profitable consulting firm, a regional manufacturer, a family restaurant group, and a growing technology startup all typically fall well under $31 million in average receipts. For these businesses, the interest deduction works the way it always intuitively should, with interest paid on legitimate business debt fully deductible.

The mechanics of the test reward steady measurement:

• Receipts are averaged over the three prior tax years rather than measured in a single year
• The gross receipts test is applied each tax year using the three prior years' average
• Tax shelters are excluded from the exemption regardless of size
• A company that crosses the threshold in one strong year may still qualify based on the three-year average

This averaging mechanism cushions the impact of a single high-revenue year. A business that spikes above $31 million once but maintains a lower three-year average can remain exempt, which prevents a temporary surge from triggering an unexpected limitation.

The breadth of the exemption is hard to overstate. Federal data has long shown that only a small fraction of business returns report receipts above the threshold, which means the interest limitation, despite its complexity, never touches most of the companies that read about it. For an exempt business, the planning takeaway is liberating. Interest on a line of credit, an equipment loan, a real estate mortgage, or a vendor financing arrangement is fully deductible in the year it accrues, with no allocation, no carryforward tracking, and no separate schedule to complete. That simplicity is itself a benefit, freeing owners to focus on growth rather than compliance. Exempt businesses should still confirm their status annually and coordinate their records with state filing calendars, such as the 2026 California State Tax Deadlines or the corresponding schedule for their state.

Calculating the limit for businesses above the threshold

Companies that exceed the gross receipts threshold must apply the full limitation, and understanding the arithmetic clarifies what is at stake. Under the EBITDA-based rule, the deductible business interest is generally limited to the sum of business interest income plus 30% of adjusted taxable income.

Consider a manufacturer with $45 million in average gross receipts, placing it above the exemption. Suppose the company reports $8 million of adjusted taxable income on an EBITDA basis and $400,000 of business interest income, while paying $3 million in interest expense.

• 30% of adjusted taxable income: $8 million times 30% equals $2.4 million
• Plus business interest income: $400,000
• Total deductible interest this year: $2.8 million
• Disallowed interest carried forward: $200,000

The $200,000 of disallowed interest is not lost. It carries forward indefinitely and becomes deductible in a future year when the company has additional capacity. By contrast, the same manufacturer under the old EBIT-based rule would have excluded depreciation from the income base, shrinking the allowable interest and disallowing far more. The permanent EBITDA approach under the One Big Beautiful Bill Act therefore protects deductions for exactly the capital-intensive companies that carry the most debt. The difference is not merely timing. For a company that consistently runs near its interest ceiling, the EBITDA base can mean the entire interest expense clears each year rather than accumulating as a growing carryforward that may never fully reverse. That certainty makes it easier to finance new equipment or facilities without worrying that the related interest will sit undeducted on the books.

The size of that protection grows with the company's investment in physical assets. A logistics firm that runs a large fleet, a manufacturer that buys heavy machinery, and a developer that holds depreciable buildings all generate substantial annual depreciation, and every dollar of that depreciation lifts the EBITDA base by the same amount. At a 30% cap, each additional dollar of adjusted taxable income raises allowable interest by thirty cents, so the EBITDA add-back can swing the deductible figure by hundreds of thousands of dollars for an asset-heavy business. Owners modeling their own numbers should focus on how Depreciation and amortization feed the EBITDA base before the 30% cap is applied.

A side-by-side comparison makes the stakes concrete. Return to the manufacturer with $8 million of EBITDA-based adjusted taxable income, and assume it claims $2 million of annual depreciation. Under the permanent EBITDA rule, the income base stays at $8 million, so 30% yields $2.4 million of allowable interest before adding business interest income. Under the prior EBIT-based approach, that same $2 million of depreciation would have been stripped out, dropping the base to $6 million and the 30% allowance to $1.8 million. The permanent rule therefore preserves an extra $600,000 of deductible interest in this single example, a difference that compounds year after year for a company that continues to invest heavily in equipment and facilities. For asset-intensive businesses, that permanence removes a real source of planning uncertainty that the old expiring framework had created.

How the entity structure affects the interest limitation

The Section 163(j) limitation interacts differently with each business structure, and entity choice can influence both whether the limit applies and how disallowed interest flows to owners. For pass-through entities, the limitation is generally applied at the entity level, and any disallowed interest is allocated to owners with special tracking rules.

A Partnerships structure carries its own detailed mechanics for excess business interest, allocating disallowed amounts to partners who can use them against future income from the same Partnership. An S Corporation applies the limitation at the corporate level and carries forward disallowed interest within the entity, while a C Corporation treats all of its interest as business interest subject to the limit.

For companies near the threshold, entity planning can matter:

• A business considering Late S Corporation elections should evaluate how the limitation flows to shareholders
• A business weighing Late C Corporation elections should consider corporate-level carryforwards
• Aggregation rules can combine related entities when applying the gross receipts test
• Common ownership across multiple companies may push the combined group above the threshold

These aggregation rules are easy to overlook. A founder who owns several small companies might assume each one qualifies individually, only to discover that combined receipts exceed the threshold once the entities are aggregated under common control. The rules look to common ownership and control rather than legal separateness, so simply forming a new entity does not reset the calculation. Owners contemplating an acquisition or a new venture should therefore run the combined receipts figure before closing, because the exemption can disappear the moment two related businesses are viewed as one.

The lesson is that the gross receipts test must be applied at the level of the controlled group, not the individual entity. Businesses that grow through acquisition or that operate several related ventures should map their ownership structure carefully and run the aggregation analysis before assuming any single entity is exempt. In some cases, deliberate structuring of ownership can keep distinct lines of business below the threshold, though such planning must respect the anti-abuse rules and cannot be a sham. For most companies, the aggregation question never arises, but for the minority operating multiple related entities, it is the single most important factor in determining whether the interest limitation applies at all.

Planning moves for businesses near the threshold

Companies hovering near the $31 million line have the most to gain from deliberate planning, because crossing the threshold introduces the full limitation calculation and its compliance burden. Several approaches help manage this transition.

First, monitor the three-year average rather than the current year alone. Because the exemption depends on a rolling average, a company can model whether an upcoming high-revenue year will push the average over the limit and plan accordingly. Reviewing filing obligations against the relevant 2026 Texas State Tax Deadlines or the appropriate state schedule keeps the timing aligned across jurisdictions.

Second, coordinate interest expense with the timing of major capital investments. Because the EBITDA-based base adds back depreciation, a year with heavy equipment purchases can expand the allowable interest deduction even for a company subject to the limit. Timing a large purchase into a year of significant borrowing lets the depreciation add-back and the interest deduction reinforce each other, producing a combined benefit larger than either move alone.

Third, document the gross receipts calculation carefully each year so the exemption is defensible. A clean record of three-year average receipts, properly accounting for aggregation, provides certainty about whether the limitation applies and protects the full interest deduction in an examination.

Consider a company whose receipts run $28 million, $30 million, and $35 million over three consecutive years. The single high year of $35 million sits above the threshold, but the three-year average of $31 million lands exactly at the line, so the business remains exempt for the year that follows. If the next year comes in at $40 million, however, the rolling average climbs to roughly $35 million, and the exemption is lost, triggering the full limitation calculation. A company watching this trajectory can act before the transition by accelerating deductible interest into an exempt year, or by timing a depreciation-heavy capital purchase into the first limited year, so the EBITDA add-back cushions the new cap. Modeling the rolling average two or three years forward turns what feels like a sudden cliff into a manageable, planned transition rather than a surprise at filing time.

Settle the interest deduction question for good

For most small businesses, the Section 163(j) limit is a non-issue, but proving it takes a defensible three-year gross receipts figure, and the companies above the line face a real calculation. Instead's comprehensive tax platform computes your rolling average, confirms whether the exemption holds, and runs the full EBITDA-based limit the moment it applies.

The hard parts are the ones owners rarely see coming, like aggregation across commonly controlled entities, disallowed interest that carries forward, and the records an examiner will expect. Instead's intelligent system handles each of those automatically and keeps the trail organized from one year to the next.

Choose a pricing plan sized to your business and replace a confusing provision with a clear, defensible answer about exactly how much interest you can deduct under the new permanent rules.

Frequently asked questions

Q: Does the Section 163(j) interest limit apply to my small business?

A: Most small businesses are exempt. If your average annual gross receipts for the three prior tax years are $31 million or less, using the 2025 inflation-adjusted threshold, you are not subject to the limitation and can deduct your business interest in full. Only tax shelters are excluded from this exemption, regardless of size.

Q: What did the One Big Beautiful Bill Act change about the interest limit?

A: The Act makes the EBITDA-based limitation permanent and applies it to tax years beginning after December 31, 2024. The EBITDA approach adds depreciation and amortization back to the income base, which allows capital-intensive businesses above the threshold to deduct more interest than the prior EBIT-based rule permitted.

Q: How is the gross receipts test calculated?

A: The test uses your average annual gross receipts over the three prior tax years. Because it is an average rather than a single-year figure, a temporary spike in one year may not push you over the limit if your three-year average remains at or below $31 million. Related entities under common ownership may need to be aggregated.

Q: What happens to the interest I cannot deduct this year?

A: Disallowed business interest is not lost. It carries forward to future years and becomes deductible when your business has additional capacity under the limitation. The carry-forward mechanics differ by entity type, with Partnerships, S Corporations, and C Corporations each following their own rules.

Q: Should my entity structure change because of the interest limit?

A: Entity structure affects how the limitation is applied and how disallowed interest flows to owners. Businesses near the threshold or carrying significant debt should evaluate how the rules interact with their structure before making a late S Corporation or C Corporation election, since the answer can affect total deductible interest.