Pine Bough Kitchen Supply has fifteen Minnesota dates in 2026, and a C corporation's first state payment would land a month before any federal one

The moment

Pine Bough Kitchen Supply is a cookware and restaurant-supply store in Rochester, Minnesota. Ingrid Halvorsen opened it in 2016 with a single aisle of pans and knives and now sells to home cooks, two school kitchens and a handful of cafes. It has two W-2 employees besides her and is taxed as an S corporation. Minnesota sales tax is collected at the counter and on the delivery invoices. It is the last day of September and Ingrid is laying out next year's tax sheet, which she does every fall.

What they did instead

Ingrid kept one calendar reminder, "sales tax, the 20th," and trusted her accountant to call about anything else. The reminder fired on the 20th every month. In June, September and December the 20th is a weekend day, so the return was not due until the Monday after, and she filed those three months two days early for no reason. The larger cost was the estimated payments. She paid them when the accountant's email arrived, never on a date she had written down, and twice that email came the week the payroll had just gone out. Nobody had a sheet showing the dates side by side.

The questions a CFO asks first

1. How many Minnesota dates does the shop have in 2026, and which of them move off the 20th?
2. What does the year look like if Minnesota has the shop file quarterly instead of monthly?
3. How many of the shop's estimated payments does the tool date, and which does it leave off?
4. What would a calendar-year C corporation owe Minnesota that an S corporation does not?

The arithmetic, shown

Five scenarios, all through the tool's own engine, all built on Pine Bough's profile: an S corporation, two W-2 employees, no 1099 contractors, Minnesota as the state, registered to collect Minnesota sales tax.

Scenario one: monthly, the schedule Pine Bough is on. The tool returns twenty-five dated line items. Twelve are Minnesota sales-tax returns, three are Minnesota individual estimated payments, and ten are federal payroll and federal estimated-tax lines. Every Minnesota date comes from one page, the Department's 2026 table, which opens with a caution:

> Below are the 2026 tax due dates. Note: If you file by fiscal year, due dates may vary.

For a monthly filer the table lists every return date:

> Sales and Use Tax return and payment, Monthly: January 20, February 20, March 20, April 20, May 20, June 22, July 20, August 20, September 21, October 20, November 20, December 21.

Three of the twelve are not the 20th. June 20 is a Saturday, September 20 is a Sunday and December 20 is a Sunday, so the returns move to

> 2026-06-22

> 2026-09-21

and

> 2026-12-21

All three are Mondays. Minnesota's estimated payments for the owner fall on April 15, June 15 and September 15, the same days as the federal schedule, so on each of those three days Ingrid has two payments to make. There are three Minnesota estimates on the sheet, where the federal schedule has four. The tool says why the fourth is missing:

> The Department's table covers 2026 only, so the fourth individual installment (January 2027) and the first C corporation payment of 2027 aren't listed.

The December return, due January 20, 2027, is left off for the same reason:

> The December 2026 monthly return (due January 20, 2027) isn't listed — this run only checked 2026 dates, which doesn't cover January 2027 yet.

The tool also says plainly what it is not asserting about the estimates:

> This tool doesn't ask whether a Minnesota estimated payment is actually owed, so it shows the schedule that would apply if one is.

Scenario two: quarterly. Suppose Minnesota assigns a lower-volume schedule. The tool returns sixteen items, and the Department's table lists the dates:

> Sales and Use Tax return and payment, Quarterly: April 20, July 20, October 20 (and January 20).

The tool dates the first three,

> 2026-04-20

> 2026-07-20

and

> 2026-10-20

Three returns replace twelve, so the shop has nine fewer Minnesota sales-tax dates. The January 20 return is left off:

> The Q4 2026 quarterly return (due January 20, 2027) isn't listed — this run only checked 2026 dates, which doesn't cover January 2027 yet.

Scenario two (b): filing once a year. The tool returns thirteen items and no Minnesota sales-tax date at all. The federal lines and the three Minnesota estimates are still there. The tool names the gap:

> This tool doesn't compute a specific date for a Minnesota sales-tax filing frequency other than monthly or quarterly, or one that isn't confirmed (an annual filer's 2027 date isn't in the Department's 2026 table).

Scenario three: the frequency not yet confirmed. With everything else answered and the filing frequency left blank, the tool does not guess. It returns a named refusal: missing: ["how often Minnesota has this business file sales tax"]. Nothing computes until there is an answer.

Scenario four: the identical profile as a calendar-year C corporation. The tool returns twenty-eight items, not twenty-five. The individual schedule goes. Federal Form 1120 and four Form 1120-W deposits arrive, along with five Minnesota corporate dates. The first is

> March 16: C Corporation Tax estimated payment (Quarterly).

March 15, 2026 is a Sunday, so the Department's own table lists March 16, a Monday, and the tool dates it

> 2026-03-16

That is a month before the first federal deposit on April 15. The annual return is the next line in the table:

> April 15: C Corporation, Fiduciary Taxes return and payment (Annually); Individual Income Tax estimated payment (Quarterly).

So April 15 carries three items at once: the federal Form 1120, the first Form 1120-W deposit and the Minnesota annual return. The remaining Minnesota payments are June 15, September 15 and December 15, and each lands on the same day as a federal deposit. A C corporation has five Minnesota dates where the S corporation has three, and the extra one comes first in the year.

Scenario four (b): the same corporation, tax year unconfirmed. Mark the corporation's tax year as not calendar-year, or as unconfirmed, and the tool returns eighteen items. Ten dates disappear: five Minnesota and five federal (Form 1120 and the four 1120-W deposits). The twelve sales-tax returns stay. The tool gives the reason:

> This corporation's tax year isn't calendar-year, or isn't confirmed as one, so no Minnesota corporate date is computed here; the Department says fiscal-year due dates may vary, so check the Minnesota Department of Revenue directly.

What changed

Ingrid has all twelve return dates for 2026 on the same sheet as her estimated payments and payroll dates. The reminder that said "the 20th" is twelve dated lines, three of which are Mondays after a weekend. The three estimates have dates she wrote down, and the tool says the fourth is not on the sheet. The number to watch is the filing frequency. Twelve dates or three is the Department's assignment, and it changes the size of the sheet by more than any other single answer.

What the tool will not do

It will not decide which schedule the shop is on. Minnesota assigns it, so the tool asks and builds dates from the answer. It will not compute the tax owed on any return or payment. It covers the base dates and leaves out a lot that the Department also has:

> This tool doesn't cover Minnesota withholding (quarterly and annual), pass-through returns (S corporation and partnership), the annual sales-tax return, any accelerated-payment schedule, or local taxes.

That list matters for Pine Bough specifically. It is an S corporation, and the Department's table names S corporations and partnerships on two dates:

> June 15: C Corporation, S Corporation, Partnership, Fiduciary Taxes estimated payment (Quarterly); Individual Income Tax estimated payment (Quarterly).

The tool dates the owner's individual payment on that line. It does not compute the entity-level payment the same line names for an S corporation, and it does not ask whether one applies. Minnesota withholding on the two employees' wages is also off the sheet. It will not know about an extension, a payment plan or a penalty already assessed on any date above, and it lists only 2026 dates, so the January 2027 items are left off. This tool supports a named list of states, which the state picker in the tool shows, and every line above is the plain due date for the entity type it was told about.