Sequoia Tile & Stone's first California sales-tax return lands the same day as three federal payroll filings, and the state's own income-tax payments turn out to be 30%, 40%, 0%, then 30% — not four even quarters

The moment

Sequoia Tile & Stone is a building-materials yard in Fresno, California: Dana Ibarra and Wes Novak, partners for eleven years, plus four employees — two counter staff, a forklift operator, and a delivery driver. For all eleven of those years the business sold wholesale only, to licensed contractors who handed over a resale certificate at the register, which meant no sales tax was ever collected on anything Sequoia sold. Early this year the partners opened a small retail counter for homeowners doing their own tile and stone work — the yard's first taxable retail sales — and registered with the California Department of Tax and Fee Administration (CDTFA) to collect sales tax for the first time in the business's history.

It is the last week of September. The bookkeeper who has always handled the partnership's federal quarterly estimated tax and the four-person payroll is now facing a due-date list that includes a separate California income-tax payment on top of the federal one, and a brand-new sales-tax filing whose assigned frequency CDTFA had not yet confirmed in writing when the calendar was first built.

What they did instead

For eleven years, "taxes" at Sequoia meant one quarterly federal estimated payment, split between the two partners by their ownership share, and nothing else — wholesale sales to contractors carrying a resale certificate were never taxable, so there was no sales-tax administration to think about at all. When the retail counter opened, Dana and Wes assumed the new sales-tax filing would simply slot into the same quarterly rhythm as everything else they already paid. That assumption cost nothing while it stayed untested. It was about to cost something the moment CDTFA actually assigned a filing frequency, and the moment California's own income-tax payments turned out not to match the federal ones at all.

The questions a CFO asks first

1. Now that retail sales are taxable, across everything this business owes — federal and California both — what is the very next date?
2. California calls its own estimated tax "4 payments," the same language the IRS uses for its four quarters. Are they the same four dates, for the same four amounts?
3. Once CDTFA assigns an actual filing frequency for the new sales-tax registration, does it run on the same calendar as the income-tax side, or a separate one?
4. If that frequency hasn't been confirmed yet, does the calendar guess an answer, or say so plainly?

The arithmetic, shown

Three runs, all through the tool's own engine, all on Sequoia's actual profile: a partnership, four W-2 employees, no 1099 contractors, California added as the state, registered to collect California sales tax.

Scenario one — the full year, run whole, sales tax assigned monthly. CDTFA assigned Sequoia a monthly filing frequency, consistent with a business now large enough to run a retail counter alongside its wholesale yard. The tool returns twenty-seven dated line items for the year. Two of them are federal annual returns: the partnership's own Form 1065 on March 16, 2026 (March 15 is a Sunday) and the partners' Form 1040s on April 15.

The first one lands earlier than either partner expected, and not alone:

> February 2, 2026 — Form 941 (Q4 2025 payroll), Form 940 (2025 FUTA), the > employees' W-2 wage statements, and Sequoia's own first sales-tax return, > all four due the same day.

A new filing landing on top of three that were already due that week is exactly the kind of collision a calendar built by memory misses.

On the income-tax side, California's own schedule is not the even quarter the federal one is:

> April 15, 2026 — federal individual estimated tax, and a separate > California estimated-tax payment of 30% of the year's total, both due.

> June 15, 2026 — federal individual estimated tax, and a separate > California payment of 40% of the year's total, both due.

> January 15, 2027 — federal individual estimated tax, and a separate > California payment of 30% of the year's total, both due.

Nothing California-specific is due September 15, even though the federal payment is. The tool's own note is direct about why:

> The third installment, due September 15, needs no payment at all — it isn't skipped here by mistake.

A partner who assumes an even 25% every quarter, the federal habit, is wrong twice over — once for sending too little in April and June, once for sending anything at all in September.

The sales-tax side runs on its own, unrelated monthly clock, and even that clock has one date neither partner would predict without checking:

> April 1, 2026 — the return covering March activity, shifted a full day > past the last day of the month because March 31 is a fixed California > state holiday (Cesar Chavez Day), not because it falls on a weekend.

Twelve sales-tax returns across the year, one federal-and-California income-tax pair on four dates, and one of those twelve lands on a date no weekend-only rule would have caught.

Scenario two — the filing frequency nobody had confirmed yet. Run with everything else answered but California's own sales-tax filing frequency left blank — a real gap, since CDTFA's confirmation letter had not arrived when the calendar was first built — the tool does not guess monthly, quarterly, or annual on Sequoia's behalf. It returns a named refusal: missing: ["how often California has this business file sales tax"]. Nothing about the sales-tax side of the calendar computes until that answer actually exists.

Scenario three — the same yard, run as a corporation instead. Sequoia is a partnership and has no plan to incorporate, but running the identical profile as a calendar-year C corporation shows what would actually change: the tool returns twenty-three dated line items, not twenty-seven. The federal side swaps forms — Form 1120's own return plus four Form 1120-W deposits, one of which lands December 15, 2026, a full month before the partnership's own January 15, 2027 date, take the place of the Form 1065, the partners' Form 1040s and the four individual estimates — and the California side loses three. All three of California's individual estimated-tax payments disappear, and nothing computed takes their place. The tool's own note says exactly why:

> This is a C corporation, so it doesn't follow the individual estimated-tax schedule below — but this run didn't verify California's own corporate franchise-tax return or its corporate estimated-tax schedule, so no California date is computed for it here.

The twelve sales-tax returns are untouched either way — incorporation changes what a business owes on income, not what it owes on the sales it already made.

What changed

CDTFA's letter arrived confirming monthly filing, closing the gap scenario two flagged, and the bookkeeper set a standing monthly reminder for the sales-tax return, separate from the quarterly reminder for the two income-tax payments. The September income-tax line was marked $0 due, not removed from the calendar, so nobody mistakes silence for an unpaid bill. And the partners now know that if they ever did incorporate, the calendar's own gap on California's corporate side means asking their CPA directly rather than assuming this tool, or any calendar built from it, has already checked that math. None of this changed what Sequoia owes for the year. It changed whether the right amount reaches the right authority on the right day, which is the entire content of a calendar.

What the tool will not do

It will not determine whether a specific sale Sequoia makes is taxable under California law in the first place. That question — whether a particular sale of goods or services actually owes California sales tax — is not something this tool rules on; it takes the owner's own answer, yes or no, and computes the filing dates that follow from whichever answer is actually true.

It will not cover California's own $800 annual minimum franchise tax on an LLC or corporation, or any local district add-on to the state sales tax rate — both are real obligations a business like Sequoia could face, and neither has a verified figure or rule behind this tool yet. They are named gaps, not computed lines.

It will not compute a single California date for this business if it were a corporation. Scenario three above is not a smaller answer — it is no answer at all for that part of the calendar, a named absence rather than a guessed one.

It will not cover Fresno County or the city of Fresno's own local requirements, if either has any beyond the state sales tax already shown. This tool supports a named, growing list of states — Texas, Florida, Washington, Nevada, Wyoming, California, New York, South Dakota, and Tennessee as of this writing — and local jurisdiction is not one of the things it asks about at all.

It will not know about an extension already filed, a payment plan already in place, or a penalty already assessed on any of these dates. Every line here is the plain, unmodified due date; nothing about a specific filing's own history changes what the tool shows.