When does an Arizona start-up subsidiary owe Arizona income tax, and should it make the multistate service provider election?

When the obligation starts

Section 43-1111 levies tax "upon the entire Arizona taxable income of every corporation," unless exempt, "in an amount of the greater of fifty dollars or" the scheduled rate, which for taxable years beginning from and after December 31, 2016 is "4.9 per cent of net income" (section 43-1111(5)). The Department's instructions to Form 120 state the filing rule without a revenue floor: "Every corporation subject to the Arizona Income Tax Act of 1978 must file an Arizona corporate income tax return," and "Every corporation required to file a return shall pay a $50 minimum tax" (Arizona Form 120 Instructions, 2025).

For a start-up, the point is timing. A subsidiary whose employees work in Arizona, or that leases an office or holds equipment here, is within Arizona's taxing jurisdiction from the day that presence begins, under any nexus standard; the federal protection for mere solicitation of orders reaches only sales of tangible personal property and does nothing for a service business. The pre-revenue year is therefore a filing year, with a loss and the $50 minimum.

The filing unit matters as much as the filing date. The Form 120 instructions state that "[a] corporation files on a combined basis when it is part of a unitary group of corporations," unless the affiliated group elects an Arizona consolidated return, which the common parent of a group filing a federal consolidated return may do (Arizona Form 120 Instructions, 2025). A subsidiary that shares management, financing and services with its parent is likely to be unitary with it and to file in the group's return; one that is not unitary with any affiliate files alone. The distinction decides most of what follows, because the multistate service provider test is measured at the group level.

Returns are due by the 15th day of the fourth month after the close of the taxable year, and the Department grants, and accepts a valid federal extension for, up to seven months (Arizona Form 120 Instructions, 2025). The extension extends the time to file, not to pay.

How Arizona sources a service receipt without the election

Arizona gives the taxpayer a choice of formula each year. For taxable years beginning from and after December 31, 2016, business income is apportioned "by either: (a) Multiplying the income by a fraction, the numerator of which is the property factor plus the payroll factor plus two times the sales factor, and the denominator of which is four," or "(b) Multiplying the income by the sales factor" (A.R.S. section 43-1139(A)(7)). The sales-factor-only choice is made by checking the box for that method on the return and completing the sales factor section of Schedule E (Arizona Form 120 Instructions, 2025). The statute sets no multi-year commitment for that choice.

Section 43-1147(A) provides that, "[e]xcept as provided by subsection B of this section, sales, other than sales of tangible personal property, are in this state" if "[t]he income-producing activity is performed in this state," or if it is performed both in and outside Arizona and "a greater proportion of the income-producing activity is performed in this state than in any other state," based on costs of performance. That is the original cost of performance rule, and it is all or nothing: the receipt goes entirely to the single state with the greater share of the costs, not in proportion to them.

For a start-up whose employees all work in Arizona, every service receipt is an Arizona receipt, whether the customer is in Phoenix or Philadelphia. Under the sales-factor-only formula, that is an Arizona factor of 100 percent; under the three-factor formula, Arizona property and payroll are also near 100 percent. The formula choice does not help; only the sourcing rule can.

A subsidiary still building out before its first contract has costs but no receipts, and nothing to source. One that bills an affiliate a cost-plus fee for the build-out work has receipts from day one, and that work is the income-producing activity for which the fee is paid. Within a combined report the fee is an intercompany charge that is ordinarily eliminated; outside one, it is a service receipt, and under the default rule it is Arizona's because the people doing the work are here.

What the election changes

Section 43-1147(B) provides that "[f]or taxable years beginning from and after December 31, 2013, a multistate service provider may elect to treat sales from services as being in this state based on a combination of income-producing activity sales and market sales." The market share phased in from 85 percent and has been complete since taxable years beginning from and after "December 31, 2016, by one hundred percent of the market sales" (section 43-1147(B)(4)). For any current year, then, the election replaces cost of performance with market sourcing for the electing taxpayer's service receipts.

"Market sales" are "the total sales from services and sales of intangibles, as defined in paragraph 3, subdivision (a) of this subsection, for which the purchaser received the benefit of the service or intangibles in this state" (section 43-1147(E)(2)). "Received the benefit of the service in this state" means "the services are received by the purchaser in this state." Only "[i]f the state where the services are received cannot be readily determined" does the statute fall back to "the home of the customer or, in the case of a business, the office of the customer from which the services were ordered in the regular course of the customer's trade or business," and, if that cannot be determined either, to "the home or office of the customer to which the services were billed" (section 43-1147(E)(4)). The cascade is ordered: billing address is the last resort, not the default.

Eligibility turns on the 85 percent test. A "multistate service provider" includes "[a] taxpayer that derives more than eighty-five percent of its sales from services or sales from intangibles provided to purchasers who receive the benefit of the service or intangibles outside this state in the taxable year of election, and includes all taxpayers required to file a combined report pursuant to section 43-942 and all members of an affiliated group included in a consolidated return pursuant to section 43-947" (section 43-1147(E)(3)(a)). Two features of that sentence carry most of the planning. The test is applied "in the taxable year of election," not in every year. And it is applied to the group: the Schedule MSP instructions direct the taxpayer to "[i]nclude sales made by all members who are required to file a combined report and all members of an affiliated group included in a consolidated return," and to measure the ratio against "total sales (including sales from services and designated intangibles) both inside and outside Arizona" (Arizona Schedule MSP Instructions, 2025). Sales of goods are in the denominator.

The election's terms are statutory. It "must be made on the taxpayer's timely filed original income tax return," and it is "[e]ffective retroactively for the full taxable year of the income tax return on which the election is made" and "[b]inding on the taxpayer for at least five consecutive taxable years, regardless of whether the taxpayer no longer meets the percentage threshold of a multistate service provider during that time period" (section 43-1147(C)(1)). To continue after five years, the taxpayer must requalify and renew for another five. During the period the election ends "[w]ithout the permission of the department on the acquisition or merger of the taxpayer," or "[w]ith the permission of the department before the expiration of five consecutive taxable years" (section 43-1147(C)(2)). The Department reads "timely filed" to include extensions and treats the schedule as the election: "By completing and including Schedule MSP with the current tax return, the taxpayer is making an irrevocable election pursuant to A.R.S. § 43-1147(B)." The schedule is filed with the election-year return and the four that follow, and boxes on Form 120 record the year of the cycle (Arizona Schedule MSP Instructions, 2025; Arizona Form 120 Instructions, 2025). An amended return cannot add the election.

A worked example

A manufacturer based in another state forms a new subsidiary to sell a subscription monitoring service to business customers. The subsidiary leases an office in Arizona and hires its staff there. Its first year is spent building the platform; it has no revenue, files Arizona Form 120, reports a loss and pays $50. In its second year it signs contracts nationwide and earns $5,000,000 of service revenue and $800,000 of net income. Arizona customers account for $300,000 of the revenue, 6 percent; the rest are customers that receive the service at sites in other states.

If the subsidiary files on its own, its Arizona result depends on the election:

• Default sourcing, either formula: every receipt is Arizona's because all the work is done in Arizona, and with all of its property and payroll in Arizona, apportionment is 100 percent, and Arizona tax is $39,200 (4.9 percent of $800,000).
• Election, three-factor formula: the sales factor drops to 6 percent, but property and payroll remain at 100 percent. Apportionment is (1 + 1 + 2 x 0.06) / 4, or 53 percent, and tax is about $20,800.
• Election, sales-factor-only formula: apportionment is 6 percent, and tax is about $2,350.

The subsidiary qualifies, because 94 percent of its sales are services received outside Arizona. The two elections work together; the service provider election without the sales-factor-only formula leaves half the income in Arizona through property and payroll.

If the subsidiary is unitary with its parent and is included in the parent's Arizona combined report, the test is run on the group. Suppose the group's total sales are $250,000,000, nearly all from equipment. The subsidiary's $4,700,000 of out-of-state service sales are under 2 percent of the group's sales, and the group cannot elect. The subsidiary's service receipts are then sourced under the default rule, and the full $5,000,000 enters the group's Arizona numerator, though against a $250,000,000 denominator its effect on the group's factor is about two percentage points. The combined-group subsidiary's problem is smaller in proportion and has no election to solve it.

Whether a start-up should make the election

While the workforce stays in Arizona, the default puts every service receipt in Arizona, so market sourcing can only lower or match it. The decision for a qualifying stand-alone subsidiary is about the five-year commitment and the year to start it.

The lock-in matters only if the facts move. The election binds "regardless of whether the taxpayer no longer meets the percentage threshold." Growth in Arizona customers costs nothing, because the default would have sourced those receipts to Arizona anyway. The election costs money in the reverse case: the team relocates or most of the work moves to another state, so that cost of performance would assign the receipts elsewhere, while Arizona customers remain. A start-up that expects to move its operations weighs that before electing.

Timing is a clock question. A loss year produces no tax either way, so electing in the first year only starts the five-year count; electing in the first profitable year captures the benefit from the start. Electing in a loss year that has receipts also shrinks the Arizona loss carried forward, because Arizona applies the net operating loss after apportionment (Arizona Form 120 Instructions, 2025). Because the 85 percent test is measured only in the election year, a start-up whose first contracts are concentrated in Arizona may not qualify until its national business arrives, and then holds the election for five years even if Arizona sales later exceed 15 percent.

The deadline is unforgiving. A late return, or a placeholder return corrected later, carries no election for that year; the statute requires the "timely filed original income tax return."

The benefit location has to be supportable. The test and the numerator both turn on where "the services are received by the purchaser." A customer headquartered in Arizona that buys the service for its sites in other states receives it where those sites are, not where the contract was signed or the invoice was sent, because the statute reaches the ordering office and the billing address only when the receipt location "cannot be readily determined." The converse also holds: a customer, including an affiliate outside the combined report, that uses the service at an Arizona site receives it in Arizona, whatever its billing address. A taxpayer that cannot document where its services are used is exposed on both the 85 percent qualification and its numerator.

An acquisition ends it. The election terminates without Department permission "on the acquisition or merger of the taxpayer." A start-up that expects to be acquired should model the acquiring group's Arizona position, because a buyer whose combined report is dominated by other sales may not be able to re-elect.

What has changed since 2019, and what has not

The default rule has not changed. Section 43-1147(A) as published on the Legislature's site on October 14, 2026 still assigns service receipts by income-producing activity and costs of performance, and market sourcing remains available only by election.

The definition has been widened twice. Laws 2018, ch. 106 (SB 1405), applicable to taxable years beginning from and after December 31, 2019, added "sales from intangibles," defined as "sales derived from credit and charge card receivables, including fees, merchant discounts, interchanges, interest and related revenue," to the 85 percent test, and the current definition of market sales counts those receipts as well; the Schedule MSP instructions confirm that "designated intangibles" are limited to those receivables. A later amendment added a category for a taxpayer with "more than two thousand employees in this state" that derives more than 85 percent of its sales from support services to a regionally accredited institution of higher education, with a limited election and a benefit deemed received "at the billing address of the student to which the services relate" (section 43-1147(D), (E)(3)(c), (E)(4)). Neither change affects a start-up selling ordinary business services, except that a payments business can count card receivables toward the test.

Repeal of the default has been proposed. SB 1575, introduced in the 2026 regular session, would have limited the cost of performance rule to taxable years beginning before December 31, 2026 and assigned service receipts thereafter "if and to the extent the service is delivered to a location in this state." The section as published on October 14, 2026 does not reflect it, and the bill had no express rule for elections already running.

Administrative guidance is thin: the Department's published guidance on the election consists of Schedule MSP and its instructions, and no published Department ruling or reported Arizona decision construing "received the benefit" for the election was located in research for this article.

Practice notes

For an Arizona-staffed start-up, the first-year questions are the filing unit (whether the subsidiary is unitary with its parent and inside a combined or consolidated return) and the formula. A stand-alone service subsidiary with a national customer base is the profile the election was written for, and only the election and the sales-factor-only formula together produce the market result. The sound sequence is to test qualification on the year's actual sales by customer location of use, decide the election year with the five-year lock-in and any planned relocation of staff in view, and file the return on time with Schedule MSP attached, because no later filing cures a missed election. Customer contracts and service records that show where each customer uses the service are the evidence for both the test and the numerator, and they are easier to keep from the first contract than to rebuild on audit. G&G State Tax Group provides Arizona apportionment and sourcing analysis, including multistate service provider election modeling for new and growing service businesses, alongside its state and local tax practice.