https://optiqo.ch/taxes/basel-stadt 2026-07-07T09:21:55.927Z monthly 0.8 https://optiqo.ch/deadlines/basel-stadt 2026-07-07T09:21:55.927Z monthly 0.6 https://optiqo.ch/taxes/basel-stadt/basel 2026-07-07T09:21:55.927Z monthly 0.6 https://optiqo.ch/taxes/basel-stadt/bettingen 2026-07-07T09:21:55.927Z monthly 0.6 https://optiqo.ch/taxes/basel-stadt/riehen 2026-07-07T09:21:55.927Z monthly 0.6