Minnesota Corporate Tax Calculator (C-Corp State Tax)

No state in this dataset levies a higher flat or top marginal corporate income tax rate than Minnesota's 9.80%. It edges out Illinois's 9.50% for the highest rate of any of the 50 states covered here, flat or graduated.

Minnesota applies that 9.80% uniformly to all apportioned C-corporation income, with no bracket thresholds to navigate, so the marginal and effective rates are identical at every income level. For a multistate corporation, the gap between Minnesota's rate and a low-tax state like North Carolina's 2.00% represents one of the largest single-state rate differentials available in domestic tax planning: a 7.8-percentage-point spread on the same dollar of income, before any apportionment considerations.

Minnesota's 9.80% rate turns the calculator's $500,000 baseline into $49,000.00 of state tax, the highest dollar figure any flat-rate state in this dataset would produce on that same $500,000 base, nearly five times North Carolina's $10,000.00 result on identical income.

Minnesota's 9.80% is the highest flat corporate rate in the United States, and it is not the whole charge: Minnesota adds an alternative minimum tax and a separate minimum fee scaled to the taxpayer's Minnesota property, payroll, and sales. Minnesota also runs a full unitary combined reporting regime, so the base is computed for the group rather than the entity.

1. Read the income field as the taxable base. The single income input is taken as Minnesota taxable corporate income exactly as typed. The code applies no modification, allocation or deduction to it before the rate stage; it is the base.
2. Apply the single statutory rate. Minnesota's 9.80% rate is multiplied against that figure with no bracket lookup, because the schedule has one band running from the first dollar: $500,000 x 9.80% = $49,000.00.
3. Subtract credits and floor the result at zero. The credits field is subtracted from the step-2 figure and the difference is clamped at $0.00, so no credit entry can drive the liability negative. With the field at its $0 default the $49,000.00 stands; enter $20,000 of credits and the page returns $29,000.00, a reduction of exactly the credit entered because the subtraction is a straight one.
4. Derive the reported rates from those two numbers. The effective rate is the tax divided by the income entered, 9.80% here, and the top statutory bracket is reported separately as 9.80%. Net after-tax retained profit is the income less the tax, $451,000.00. Those four outputs are the whole of what the engine produces.

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

1. Start with apportioned taxable income. The corporation has already apportioned $500,000 of its total taxable income to Minnesota using the state's statutory apportionment formula, before any state-level tax is applied.
2. Apply Minnesota's flat statutory rate. Minnesota taxes all C-corporation income at a single flat rate of 9.80%, regardless of income size, so no bracket lookup is required: $500,000 × 9.80% = $49,000.00.
3. Minnesota corporate tax due: $49,000.00.
4. Net retained profit. Subtracting the state tax liability from taxable income leaves $500,000 − $49,000.00 = $451,000.00 in after-tax profit retained by the corporation, before any separate federal tax liability is applied.

Because Minnesota uses a single flat rate rather than graduated brackets, the 9.80% 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 9.80% state rate on their apportioned income.

Minnesota's rate is flat, so the sweep is linear and the interesting numbers are the slope and the credit multiplier, both of which are the largest in this batch because the rate is.

The marginal cost of the next unit. Each additional $1,000 of apportioned Minnesota income costs $98.00, the steepest figure of any state on this platform. The engine returns $49,000.00 at $500,000 and $49,098.00 at $501,000, and $48,020.00 at $490,000. At scale: $9,800.00 at $100,000, $98,000.00 at $1,000,000, $490,000.00 at the $5,000,000 enterprise row. Against Missouri's $40.00 per $1,000, the same marginal dollar of profit costs a Minnesota filer nearly two and a half times as much in state tax.

Right method against wrong method, priced. Entering $10,000 of credits against $500,000 of income takes the tax from $49,000.00 to $39,000.00, an exact $10,000.00 saving, with the effective rate dropping to 7.80% and the marginal rate unchanged at 9.80%. Getting the same relief through deduction, by reducing income to $490,000, saves only $980.00. The credit is worth 10.2 times the deduction here, the narrowest multiple in this batch precisely because Minnesota's rate is the highest: the higher the rate, the more a deduction is worth and the smaller the gap.

The reverse question. $49,000.00 of Minnesota tax corresponds to exactly $500,000 of apportioned income, and each further $10,000 of tax to $102,041 of income. A corporation holding $49,000.00 of usable credits pays nothing on $500,000 of income.

Where the credit arithmetic stops. The engine takes net tax as the greater of zero and tax less credits, so $60,000 of credits against $500,000 of income returns $0.00 and an effective rate of 0.00%, with the excess $11,000 discarded. No carryforward, refundability or transferability logic exists in this code path.

What the 9.80% figure leaves out. Minnesota also imposes an alternative minimum tax on corporations and a separate minimum fee scaled to Minnesota property, payroll and sales, neither of which appears anywhere in this calculation. A corporation with modest income and substantial Minnesota presence can therefore owe more than the figure computed here, and one with no income computes to $0.00 while still facing the minimum fee. The engine performs no apportionment either: the amount entered is treated as already apportioned.

• Federal Taxable Income Starting Point. Net corporate earnings are determined under IRC § 63 before Minnesota modifications. This calculator starts one step later: the income box is read as the finished Minnesota taxable figure and nothing is derived from a federal return.
• Minnesota Additions & Subtractions. Minnesota decouples from federal bonus depreciation and section 179 expensing, requiring an addback with a multi-year recovery subtraction. No addback and no subtraction is computed anywhere in this page's code path, so enter an income figure that already reflects them.
• Apportionment Factor Allocation. Minnesota apportions on a single sales factor with market-based sourcing, applied to the unitary combined group on a water's-edge basis. The engine performs no apportionment of any kind. The word does not appear in the primitive this page binds to; the figure you type is taken as the Minnesota figure and multiplied by the rate as it stands.
• Net Operating Loss (NOL) Deductions. Allowable Minnesota NOL carryforwards reduce the base, subject to the state's percentage limitation on annual usage. No loss deduction is applied by this calculator. If a carryforward is available, subtract it yourself before entering the income.
• Minnesota's alternative minimum tax and minimum fee. Minnesota compares the regular tax with an alternative minimum tax and adds a minimum fee based on in-state property, payroll, and sales. No floor of any kind exists in the code path. Enter $0 of income and this page returns exactly $0.00, which is not what Minnesota would bill.
• 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).

• Underestimating the Rate's Bite: Treating Minnesota's 9.80% rate as roughly comparable to a typical state's flat rate, when it's actually the highest of any state in this dataset.
• Improper Apportionment Sourcing: Applying market-based sourcing vs cost-of-performance rules incorrectly for service revenue apportioned to Minnesota.
• Ignoring Unitary Group Combined Reporting: Failing to account for Minnesota's mandatory combined return requirements across related entities.
• Neglecting State NOL Carryforward Caps: Overlooking Minnesota's annual percentage limitations on net operating loss deductions, which carry outsized weight given the 9.80% rate applied to whatever base survives them.

• Minnesota Department of Revenue: Corporate Tax Statutes and Guidance (2026). revenue.state.mn.us
• Multistate Tax Commission (MTC): Uniform Apportionment and Allocation Guidelines. mtc.gov