Earning Rate

The earning rate is calculated as "points awarded / amount spent x 100." For example, if a 1,000 yen purchase earns 10 points, the earning rate is 1%. However, comparing earning rates requires caution, as the value per point differs across programs - a fact that is easy to overlook.

For instance, Card A awards 1 point per 100 yen (1 point = 1 yen equivalent), while Card B awards 2 points per 100 yen (1 point = 0.5 yen equivalent). Card B's nominal earning rate appears twice as high, but the actual cashback is the same 1 yen. When comparing earning rates, you must always normalize to the "yen-equivalent value per point" to calculate the effective earning rate. When reading comparison sites or advertisements, check whether the figure shown is the nominal earning rate or the yen-converted effective rate before comparing.

To boost your earning rate, look beyond just choosing a card with a high base rate - leveraging partner stores and campaigns is an effective strategy. Some cards designate specific convenience stores, supermarkets, and other partner stores where the earning rate is higher than the base rate. Choosing a card whose partner stores align with your regular shopping habits can significantly change your annual point haul.

Another practical consideration is the "rounding unit" for point awards. Cards that award points in 1,000-yen increments give zero points on a 999-yen purchase. Cards that award in 100-yen or 1-yen increments minimize such losses. The more frequently you make small purchases, the greater the benefit of choosing a card with a smaller rounding unit. The amount you lose also depends on whether the unit applies per transaction or to your monthly total, and purchases at some merchants may earn a reduced rate, so check the terms of the point program as well.