Rubbish

Reference in English from tax office Zurich here

If you pay source tax a.ka. "Quellensteuer" (permits L and B basically, unless married to Swiss citizen or C permit holder who don't pay Quellensteuer)

- If you earn more than 120k CHF per year (pro-rata for part year) then you fill in a full tax return
Point 12 in the link above

- If you earn less then this, you can claim a "correction of withholding tax"
Point 9 in the link above

I've had a tax refund every year because of these rules mainly from Pillar 3a and Open University course fees.

Find a competent treuhand and you'll be sorted

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