Question 1

Are my days sent anywhere?

Accepted Answer

No. The calculator and company mode run in the browser. Days, names and salary are not attached to any request. An anonymous count records only that a calculation happened and for which employer country, never the values, in our own Google Sheets spreadsheet.

Question 2

Is this tax advice?

Accepted Answer

No. The tool applies the published texts consulted on 27 September 2026 and shows its sources. It does not replace the cantonal administration or a fiduciary. Rounding and deadlines can differ.

Question 3

Why two counters?

Accepted Answer

Tax working time (for example the simplified 240 days) is not CCSS or FSIO working time, which includes sick days and excludes paid leave. The 40% or 34-day threshold does not decide the A1 certificate.

Question 4

Which deadlines are shown?

Accepted Answer

Only three dates are published here: Geneva and Jura on 31 January 2027, Vaud on 28 February 2027. For Basel-City, Basel-Country, Neuchâtel, Bern, Solothurn, Valais and the other cantons, the tool says to consult the cantonal administration and shows no date.

Question 5

Does the tool file the declaration?

Accepted Answer

No. It does not write to Swissdec, ISeL, the Vaud passerelle, ALPS or SECUline. The CSV/XLSX export carries the attestation columns (name, year, rate, optional gross salary) so payroll can enter the rate it already transmits.

Question 6

What happens above 40%?

Accepted Answer

If telework alone exceeds 40% of working time, France taxes all telework from the first day and missions are not added to the rate. Equality at 40% stays inside the tolerance.

Question 7

Does Luxembourg count 34 days for everyone?

Accepted Answer

The published threshold is 34 days. For France it is prorated by occupancy and months, rounded down. Germany and, by default, Belgium stay at 34 with no proration. A started French or Belgian day counts as a full day. In Germany, under 30 minutes does not count, unless it is paid on-call from home.

Question 8

Does the presale take a payment?

Accepted Answer

No. “Reserve the founder price” records an intent (40% off year 1, price locked for 24 months, a full refund if v1 is not delivered before 15 January 2027). Nothing is charged.