Amsterdam Travel Guide
In Dutch restaurants, a service charge of about 5% is often included in menu prices. Round the bill up to a convenient figure, or leave a few euros extra, if you've really enjoyed the meal and you got good service, and leave the tip as change rather than putting it on your credit card. If you're not satisfied, don't leave anything. Though a service charge is also included in hotel, taxi, bar, and café bills, the Dutch mostly round up the change to the nearest two euros for large bills and to the nearest euro for smaller ones. Consider tipping in bars only if you were served at a table. Restroom attendants and cloakroom attendants usually have fixed charges that are clearly displayed and do not require tipping.
If service is not included, people often round up a bit when paying, but it isn't offensive to pay the exact amount. Taxi drivers also appreciate a rounding up of the bill, but again, paying the exact amount is perfectly acceptable. Railway porters expect €1 per item. For bellhops and doormen at both hotels and nightspots, a few euros is adequate. Bartenders are tipped only for notably good service; again, rounding off is sufficient.