割り増し

• Reading: わりまし
• Romaji: warimashi
• Kanji breakdown: 割り (wari) — ratio, proportion; 増し (mashi) — addition, increase
• Pronunciation: /waɾimaɕi/

Meaning

Surcharge; premium; extra charge added on top of the base price or rate.

Formed from 割り (ratio, portion) and 増し (increase, addition). Refers to any additional charge levied above the standard price. Key usages include 深夜割り増し (late-night surcharge — typically 25% extra under the Labour Standards Act for work between 22:00–5:00), 時間外割り増し (overtime premium), and 割り増し保険料 (loaded premium in insurance for higher-risk customers).

Examples

1. 深夜勤務には通常の二十五パーセント割り増しの賃金が支払われる。 A wage premium of twenty-five percent above the standard rate is paid for night shift work.
2. 繁忙期には宿泊料金に割り増しが加算されるため、旅費が膨らむ。 During busy periods, a surcharge is added to accommodation rates, causing travel expenses to balloon.
3. 保険のリスク区分が高い場合、割り増し保険料が適用されることがある。 If an insurance customer falls into a high risk category, a loaded premium may be applied.

Usage Guide

Context: labour law, hospitality, insurance, pricing

Tone: neutral

Origin & History

Compound of 割り (from 割る, to divide/split — used here as a proportional increment) and 増し (from 増す, to add more). Together they describe an additional fractional increment added to a base amount — literally 'a proportion added on.'

Cultural Context

Era: Modern

Generation: Adults

Social background: Universal