The down payment is your skin in the game. Lenders require it to ensure the property is worth more than the loan and to reduce default risk. The larger the down payment, the lower the loan-to-value ratio (LTV) and usually the better the interest rate.
In Switzerland, lenders require at least 20% down — of which at least 10% must be 'hard' equity (savings or pillar 3a, not pension fund withdrawal). Germany typically expects 10–20%; France often 10–20%; Italy 20–30% for first-time buyers, sometimes less with state guarantees.
Saving the down payment is the single biggest hurdle to home ownership for most Europeans. Pillar 3a (CH), Bausparvertrag (DE), PEL (FR) and dedicated savings products help — but the down payment usually represents 5–10 years of disciplined saving.
Buying a CHF 1,000,000 apartment in Zurich requires CHF 200,000 down (20%). Of that, at least CHF 100,000 must come from personal savings or pillar 3a; the other CHF 100,000 can be drawn from your pension fund.