Arizona Corporate Tax Calculator (C-Corp State Tax)

Compared with neighboring California, whose flat 8.84% rate nearly doubles it, Arizona's 4.90% corporate income tax rate marks the state as a comparatively low-tax jurisdiction for C-corporations. Indiana levies the identical 4.90% rate, making the two the only states in this dataset that share that specific figure.

Arizona's flat structure means the 4.90% rate applies uniformly regardless of how large a company's apportioned income becomes, with no bracket thresholds to plan around. For multistate businesses evaluating where to site operations, a rate under 5% places Arizona in the lower third of states that impose any corporate income tax at all, trailing states like North Carolina, Missouri, and Oklahoma that tax corporate profit more lightly still.

On the calculator's $500,000 example, Arizona's flat rate produces $24,500.00 in state tax, a number that moves in exact lockstep with apportioned income since there's no bracket structure to accelerate or soften the bill as a company grows. Double the income and the tax bill doubles precisely alongside it.

Arizona levies a flat 4.90% corporate rate with no brackets, which makes the arithmetic on this page trivial and pushes all the analytical work into apportionment and sourcing, neither of which this calculator performs. Arizona also assesses a statutory $50 minimum tax that the engine does not model.

The engine runs three steps. Everything else on an Arizona return happens before the figure reaches this box.

1. Take the income figure as entered. No apportionment formula runs here, no sales-factor election, no addition or subtraction schedule, no nexus test and no NOL carryforward. Whatever you type is treated as final Arizona taxable income.
2. Multiply by 4.90%. One rate, no bracket lookup. $500,000 returns $24,500.00; $5,000,000 returns $245,000.00.
3. Subtract credits, floor at zero, and report. $10,000 of credits against the baseline returns $14,500.00 and moves the effective rate from 4.90% to 2.90%, while the marginal rate, computed before credits, still reads 4.90%. Net retained profit is $475,500.00 at the baseline.

The $50 statutory minimum is not applied by this calculator. Entering $0 of income returns $0.00, not $50.00, and so does any run where credits exceed the computed tax. Arizona's minimum is real; the engine does not implement it, and the figure it produces is the rate calculation alone.

Using this calculator's baseline scenario: a corporation with $500,000 in taxable income apportioned to Arizona.

1. Start with apportioned taxable income. The corporation has already apportioned $500,000 of its total taxable income to Arizona using the state's statutory apportionment formula, before any state-level tax is applied.
2. Apply Arizona's flat statutory rate. Arizona taxes all C-corporation income at a single flat rate of 4.90%, regardless of income size, so no bracket lookup is required: $500,000 × 4.90% = $24,500.00.
3. Arizona corporate tax due: $24,500.00.
4. Net retained profit. Subtracting the state tax liability from taxable income leaves $500,000 − $24,500.00 = $475,500.00 in after-tax profit retained by the corporation, before any separate federal tax liability is applied.

Because Arizona uses a single flat rate rather than graduated brackets, the 4.90% effective rate is identical to the marginal rate at every income level: a corporation earning $50,000 and one earning $50 million both face the same 4.90% state rate on their apportioned income.

Arizona has no bracket edge, and the sweep proves it at the three income levels where other states in this corpus break. At $2,999 the tax is $146.95; at $3,001 it is $147.05. At $24,999 it is $1,224.95; at $25,001 it is $1,225.05. At $221,999 it is $10,877.95; at $222,001 it is $10,878.05. Ten cents for two dollars of income in each case, at the same 4.90% marginal rate the calculator reports at every point in the sweep including $0 of tax at $0 of income.

The twelve-row schedule is the same straight line, and it is worth reading as a scaling check rather than a discovery: $12,250.00 of tax at $250,000.00 of income, $24,500.00 at $500,000.00, $49,000.00 at $1,000,000.00. Exactly double, then double again.

Each additional $1,000 of Arizona taxable income costs $49.00. From the sweep: $499,000 returns $24,451.00 and $500,000 returns $24,500.00; $500,000 returns $24,500.00 and $501,000 returns $24,549.00. Ten thousand dollars more, at $510,000, returns $24,990.00, which is the same $49.00 per thousand ten times over.

The reverse question -- how much can be earned before crossing into a higher bracket -- has no answer on this page, because there is no higher bracket to cross into. A $2,999 filer and a $5,000,000 filer face the identical 4.90% marginal rate. In a graduated state that question is the most useful thing a corporate calculator can answer; here the honest response is that the only lever on the Arizona bill is the size of the base, which is decided by apportionment the engine does not compute.

Credits are subtracted from the computed tax and floored at zero. On the $500,000 baseline, $10,000 of credits returns $14,500.00 and drops the effective rate to 2.90%. $50,000 of credits returns $0.00. $1,000,000 of credits also returns $0.00.

Those last two runs differ by $950,000 of credit value and produce the same answer, because the engine models credits as non-refundable with no carryforward. It is also where the missing $50 minimum shows most clearly: a real Arizona filer whose credits wiped out the tax would still owe $50.00, and this page reports $0.00. Separately, the twelve-row table is computed from the rate alone and ignores the credit input entirely, so a credited run shows $14,500.00 in the headline while the table's sixth row still reads $24,500.00.

• Federal corporate income tax (21% under IRC § 11).
• Specialized gross receipts taxes (e.g. Ohio CAT, Washington B&O, Texas Franchise Tax) where applicable.
• Minimum entity franchise tax fees or annual report filing charges.
• Base Erosion and Anti-Abuse Tax (BEAT) or Global Intangible Low-Taxed Income (GILTI) provisions.
• Local municipal corporate earnings taxes (e.g. NYC General Corporation Tax).
• Arizona's $50 statutory minimum tax. Not implemented: $0 of income returns $0.00, and credits in excess of the tax return $0.00 rather than $50.00.
• Everything that produces the base. No apportionment or sales-factor election, no nexus or P.L. 86-272 test, no state additions or subtractions and no NOL carryforward are computed here.
• Credit carryforward and refundability. $50,000 and $1,000,000 of credits both return $0.00 on the $500,000 baseline.

• Mistaking the Flat Rate for the Final Bill: Assuming Arizona's 4.90% rate applies directly to book income rather than to apportioned taxable income after state additions, subtractions, and NOL adjustments.
• Improper Apportionment Sourcing: Applying market-based sourcing vs cost-of-performance rules incorrectly for service revenue apportioned to Arizona.
• Ignoring Unitary Group Combined Reporting: Failing to account for Arizona's mandatory combined return requirements across related entities.
• Neglecting State NOL Carryforward Caps: Overlooking Arizona's annual percentage limitations on net operating loss deductions, which matter even at a below-average 4.90% rate.

• Arizona Department of Revenue: Corporate Tax Statutes and Guidance (2026). azdor.gov
• Multistate Tax Commission (MTC): Uniform Apportionment and Allocation Guidelines. mtc.gov