Skip to content 
The Massachusetts corporate excise has two parts. The income measure is 8.0% of net income apportioned to Massachusetts. The non-income measure is $2.60 per $1,000 of either taxable tangible property or taxable net worth, depending on which category the corporation falls into. The two are added together, with a minimum of $456 that cannot be prorated.
“We have no revenue. Is the whole bill just the $456 minimum?”
“We raised a Series A and spent almost none of it. Does that figure appear anywhere on a tax return?”
“What changes when we actually start making money?”
Two Measures, Added Together
Most founders meet the corporate excise as a single number and assume it behaves like income tax. It does not. Per the Department’s corporate excise guide, the excise combines an income measure with a non-income measure, and the return adds one to the other rather than choosing between them.
The income measure is 8.0% of net income apportioned to Massachusetts, which is the familiar half. The non-income measure is $2.60 per $1,000, applied to either taxable tangible property or taxable net worth, and it is the half that surprises people. Both rates appear in the Commonwealth’s published rate schedule.
Underneath both sits the minimum of $456, which applies when the combined measures fall below it and cannot be prorated for a short year.
The Two Halves, and Why the Second One Matters
| The Component | What It Taxes | What It Means for a Startup |
| Income measure | 8.0% of net income apportioned to Massachusetts | Nothing while you are losing money, and the larger number once you are not |
| Non-income measure | $2.60 per $1,000 of tangible property or net worth | The one founders never see coming, because it does not care about profit |
| Which base applies | Tangible property where Massachusetts tangible assets reach a defined share of total assets, otherwise net worth | A software company with laptops and no factory is usually measured on net worth |
| Minimum excise | $456, and it cannot be prorated | Owed by a dormant shell, a pre-revenue company, and a first partial year alike |
| How they combine | The income measure is added to whichever non-income measure applies | Two bills in one, not a choice between them |
| Measurement | Profit is only half the question | A funded company with no revenue can owe far more than the minimum, because the second measure reaches the balance sheet rather than the income statement |
Which Base Applies to You
The second question at the top is where this article earns its place, because the answer is one most founders have never been told.
A corporation is classified for the non-income measure according to the composition of its assets. Where its qualifying Massachusetts tangible property reaches a defined share of its total assets, it is measured on that tangible property. Where it does not, the corporation is measured on taxable net worth instead, as the Form 355 instructions set out.
Now apply that to a typical Cambridge software or biotech company. It owns laptops, some lab equipment perhaps, and very little else in the way of tangible Massachusetts property relative to its total assets. It falls on the net worth side.
And net worth, for a funded startup, is largely the money that came in from investors and has not yet been spent. A company holding a substantial raise on its balance sheet is therefore carrying a non-income excise base that has nothing to do with revenue it has not earned.
At $2.60 per $1,000, several million dollars of taxable net worth produces an excise in the thousands rather than the hundreds. It is not ruinous, and it is entirely invisible to a founder budgeting for a $456 minimum.
The computation of taxable net worth has its own rules and adjustments rather than being the bank balance, which is precisely why it is worth having someone calculate it rather than estimating from the cap table.
The timing consequence is worth planning around. Because the measure looks at the balance sheet, a company sitting on a fresh raise at its year end carries a larger base than the same company a year later with the money deployed into salaries and equipment, which makes the closing date a fact worth knowing in advance rather than discovering afterwards.
The Numbers Behind the Excise
- 8.0%: the income measure on net income apportioned here.
- $2.60 per $1,000: the non-income measure, equal to 0.26%.
- $456: the minimum, not prorated for a partial year.
- 2: the measures, added rather than compared.
- $1,000: the liability above which estimated payments are required.
- 4: the estimated installments, and they are not equal.
Pre-Revenue Still Files
The first question has a short answer with a long tail. Yes, the minimum applies at zero revenue, and no, the minimum is not necessarily the whole bill.
The excise is a charge for the privilege of doing business rather than a tax on profit, so a loss-making year produces no income measure and still produces a return, a non-income measure, and at least the minimum.
The minimum also continues until the entity is formally dissolved, which is why abandoned companies quietly accumulate liabilities. Credits do not rescue you either, since research credits cannot reduce the excise below the minimum, a point covered in the research credit article.
What Changes When Revenue Arrives
The third question brings in apportionment, which decides how much of the income measure Massachusetts gets to tax.
A company doing business here and elsewhere does not pay 8.0% on everything. It pays on the share apportioned to Massachusetts, and most corporations now determine that share using a single sales factor, replacing the older formula that weighted property, payroll and sales together.
For a company with engineers and offices here and customers everywhere, single sales factor is generally favorable, because the in-state headcount and property that would have pulled the apportionment upward no longer feature in the calculation.
There is a further classification worth checking. The development and sale of prewritten software is treated as a manufacturing activity for certain corporate excise purposes, which can affect apportionment and credit eligibility, and it is discussed alongside the sales tax question in the software tax article.
Filing, Paying, and the Installments Nobody Expects
Returns are filed electronically, and the deadline follows entity type: a C corporation files its excise return on the fifteenth day of the fourth month after year end, while an S corporation files a month earlier.
Estimated payments are required once the liability exceeds $1,000, and the installment pattern is unusual enough to catch people out. Rather than four equal payments, the schedule is weighted toward the front of the year, with the largest instalment first and the smallest last.
Massachusetts S corporations deserve a separate mention, because the federal habit of thinking of them as fully pass-through does not hold here. An S corporation still owes an entity-level excise, including the non-income measure and the minimum, with an income measure applying once receipts pass defined thresholds.
For a venture-backed company the point is usually academic, since institutional investors and the standard Delaware C corporation structure rule the S election out. It matters to the founder who bootstrapped an earlier venture and carries assumptions from it into the new one.
Common Mistakes With the Corporate Excise
- Budgeting the $456 minimum and discovering the net worth measure afterwards.
- Assuming the two measures are alternatives rather than components added together.
- Treating a Delaware charter as a reason not to file in Massachusetts.
- Leaving a dormant entity undissolved while the minimum keeps accruing.
- Missing the first estimated installment, which is the largest of the four.
- Expecting an S corporation election to remove the entity-level excise here.
Model It Before the Year Ends
Corporate excise is one of the few startup taxes that can be calculated in advance with real precision, because both measures rest on figures the company already knows: its apportioned income and its balance sheet. Modelling it in the fourth quarter is a short exercise that prevents an unpleasant surprise in the first, and it sits alongside every other year-one obligation in the founder playbook.
Ed Parsons CPA prepares Massachusetts corporate excise returns for funded and pre-revenue companies, determines the correct non-income base, models apportionment before the year closes, and handles the estimated payment schedule, under the firm’s startup tax help service.
Where prior years were never filed or an assessment has issued, a Business CPA Tax Resolution Case Analysis prices the exposure before anything is signed or paid.
