noun
bath tax; hot spring tax
A municipal tax levied on visitors to hot spring resorts, typically included in the accommodation fee.
旅館の宿泊料金には入湯税が含まれています。
The accommodation fee at the ryokan includes the hot spring tax.
Compound of 入湯 (にゅうとう, 'bathing in hot springs') and 税 (ぜい, 'tax').