Step Back in Time: The Definitive Collection was a commercial success. It debuted at number one in Australia, becoming her sixth album to do so, and remained on the
regional chart for four weeks. In New Zealand, the album spent one week at number 27 on the
regional chart.
Music Week reported that all formats sold 31,980
album-equivalent units in the region, with 25,992 of those units from physical sales, including 5,682 vinyl copies. The album spent a total of twenty weeks on the charts and was certified gold by the
British Phonographic Industry (BPI) for shipments of 100,000 units in the country. In Spain, the album debuted at number five on the
Spanish Albums Chart and spent a total of 12 weeks there. Furthermore, it reached number nine in both Belgium (
Flanders) and Switzerland (
Romandy). It reached the top twenty in Switzerland and Germany, as well as the top forty in Austria, Hungary, the Czech Republic, the Netherlands, Italy, and Portugal. Elsewhere, the album peaked at number 41 in Poland, and 45 in France. In the United States, the album reached number six on the
Independent Albums chart, 32 on the
Top Album Sales chart, and 23 on the
Top Tastemaker Albums chart. ==Promotion==