NYC Unincorporated Business Tax (UBT): Single-Factor Allocation & Performance-Sourcing

Most New York City partnerships treat the Unincorporated Business Tax (UBT) as a settled line item. The firm is headquartered in Manhattan, clients are distributed nationwide, the business allocation percentage (BAP) on the return has read 100% for years, and nobody has had a compelling reason to look again.

That posture made sense when the tax relied on a three-factor formula and two of those factors were anchored to real estate leases and payroll records. It stopped making sense in 2018, and hybrid work finished the job. Today, the UBT is a single-factor receipts tax, and that single factor turns strictly on where the individuals performing the service were physically standing when they performed it.

For a Midtown professional services practice or Greenwich-adjacent fund management company whose partners work two days a week from Connecticut, Westchester, or Palm Beach, that distinction is not a rounding error. Applied to a 4% tax rate, the difference between a 100% allocation and a supportable lower one can be material. Whether any particular firm has such a position is a facts-and-circumstances question for its own counsel. What is clear is the practical obstacle: it is rarely the tax law, and it is almost always that the firm cannot prove where its fee earners physically were.

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1. What the Tax Is

The UBT is imposed under NYC Admin. Code § 11-503 on the unincorporated business taxable income of every unincorporated business carried on within New York City. It reaches partnerships, LLCs taxed as partnerships, and sole proprietorships. It does not apply to entities subject to the corporate tax under Subchapter 3-A, which is why the C corporation down the street faces a completely different—and differently sourced—tax regime.

The statutory rate is 4% NYC Admin. Code § 11-503; 19 RCNY § 28-03.

The population with significant tax exposure includes:

• Law firms and legal partnerships
• Accounting and advisory practices
• Management consultancies
• Architecture and engineering firms
• Medical and dental groups
• Advertising agencies
• Investment management companies organized as partnerships or LLCs, earning management and performance/incentive fees

Note: Specific statutory carve-outs exist under § 11-502 for designated self-trading activities and real estate holding. Net rental real estate income is excluded from allocation altogether and sourced directly to where the property is located.

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2. The Statutory Shift: The Single Receipts Factor

For decades, the UBT utilized a three-factor formula: property, payroll, and gross income, averaged. Legislation enacted in 2009 phased that formula out over nine years, shifting weight progressively to the gross income factor.

Property and payroll factors were eliminated entirely. Under the old formula, a firm maintaining a Manhattan lease and Manhattan payroll was pinned near a 100% allocation regardless of where partners actually worked. Those anchors no longer exist. A firm's entire UBT allocation now rests on a single receipts fraction—and that fraction is measured by physical performance.

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3. How Service Receipts Are Sourced: Performance vs. Market

Here is where the UBT diverges sharply from the corporate tax, and where a good deal of published commentary gets the law wrong.

New York City's corporate tax was reformed under Subchapter 3-A (effective 2015) to adopt customer-based (market) sourcing: a receipt from services rendered to a corporate taxpayer is a NYC receipt if the customer received the benefit of the service within the City.

This is NOT the UBT rule. NYC Admin. Code § 11-508(c)(3) contains an explicit performance proviso, phased in by gross receipts thresholds beginning in 2005 and reaching its final, universal form in subparagraph (C):

Performed. Not benefited from, not consumed, not delivered—performed.

The practical consequence is direct: a UBT taxpayer's allocation percentage is a function of where its service-performing personnel were physically standing. A Chicago client who pays a Manhattan partnership for work performed by partners located in Connecticut or Florida generates non-City receipts. A Manhattan client who pays for work performed in Manhattan generates City receipts. The client's location is irrelevant.

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4. Specialized Statutory Sourcing Regimes

Three specific statutory carve-outs displace the general physical performance rule. Identifying these is critical to avoiding incorrect returns:

1. Registered Securities and Commodities Brokers & Dealers § 11-508(e-3): For tax years beginning after 2008, enumerated receipts (brokerage commissions, margin interest, underwriting advisory, M&A advisory, account maintenance fees) are sourced to the customer's mailing address in the taxpayer's records. Principal transactions are sourced by production credits or customer address election. Applies strictly to SEC/CFTC registered broker-dealers or registered OTC derivatives dealers.
2. Services to Investment Companies § 11-508(e-2): Receipts from management, administration, or distribution services sold to a Regulated Investment Company (RIC under IRC § 851) or certain Publicly Traded Partnerships (IRC § 7704) are sourced based on the monthly average fraction of shares held by NYC-domiciled shareholders.
3. Publishers and Broadcasters § 11-508(e-1): Sourced by delivery points, subscriber addresses, and audience statistics.

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5. Measuring "To the Extent Performed Within the City"

The statute does not specify an explicit day count or hour count formula. Two regulatory provisions offer interpretive signals on how the Department of Finance has approached time-based allocation, subject to an important caveat noted below:

• Alternative Allocation Methods 19 RCNY § 28-07(e)(4) Example: Under the alternative allocation rules, the regulation illustrates that a lump sum fee for services performed within and without NYC may be allocated based on "amounts of time spent in performance of such services within and without the City." While using an alternative method requires a formal request and rider, the example shows that DOF has treated a documented time-in-City fraction as a reasonable basis for splitting a service fee.
• Time-Basis Compensation Measure 19 RCNY § 28-07(d)(1)(ii)(C)(c): For employees compensated on a time basis, the historical rule measured city activity by the proportion which "working time employed within New York City bears to total working time."

The Formula Is Not the Only Route — and Not the Last Word

Two provisions cut against treating the receipts formula as self-executing, and both belong in any serious analysis.

Books-and-records allocation. NYC Admin. Code § 11-508(b) permits the portion allocable to the City to be determined from the books of the business where the Commissioner of Finance approves the methods used as fairly and equitably reflecting City income. On the face of subdivision (b), the general books method is expressed as available for taxable years beginning before January 1, 2005, together with a one-time election, made on the first return for a year beginning on or after January 1, 2005 and before January 1, 2006, to continue that method for years beginning before January 1, 2012 — subject to revocation rules including a more-than-50% continuity-of-ownership requirement. Firms with genuinely segregated books should confirm the current availability of this route with counsel rather than assuming the formula is the only path.

The Commissioner can adjust the result. NYC Admin. Code § 11-508(d) provides that allocation is determined under the Commissioner's rules where it appears that City income is not fairly and equitably reflected under subdivision (b) or (c). § 11-508(h) goes further, authorizing the Commissioner, where a business allocation percentage "does not properly reflect the activity, business, or income of a taxpayer within the city," to adjust it by excluding one or more factors, including additional factors such as expenses, purchases or contract values, excluding assets, or by "any other similar or different method calculated to effect a fair and proper allocation."

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6. The Evidence Problem & Audit Defense

Absent contemporaneously generated proof, a firm with its principal office in New York City routinely files at or near 100% BAP. There is no penalty for overpaying and no notice arrives, so if a lower allocation would in fact have been supportable, the difference is simply remitted to the City in cash year after year.

When firms attempt to claim out-of-city allocation upon audit, typical retrospective reconstructions routinely fail:

• Calendar Entries: Reflect intent, not physical location, and are frequently modified after the fact.
• Building Badge Logs: Record entry to a single building but say nothing about non-badge days or offsite work.
• Expense & Travel Reports: Only capture days on which money was spent or commercial transit was booked.
• Filing-Season Spreadsheets: Prepared months later from memory, auditors view self-reported spreadsheets as assertions rather than evidence.

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7. Where Domicile365 Enterprise Fits

Domicile365 Enterprise supplies the contemporaneous evidentiary layer most firms lack when an allocation position is examined:

A firm with a contemporaneous, tamper-evident location record has a factual foundation its advisers can reason from. A firm without one is choosing between filing at 100% and defending an estimate.