The singer and DJ placed top on Forbes magazine's richest couples list, which this year ranks entertainers based solely on their annual income.
One of only three couples where both members made the Celebrity 100 index, Swift and Harris's combined yearly earnings have been estimated at $146m (£93m) by the financial publication.
Last year's top earners, Beyoncé and Jay Z, have fallen into second place, raking in just over $110.5m (£70.2m) between them over the course of the past 12 months.
The final couple in the lineup are country stars Miranda Lambert and Blake Shelton, who each brought in $28.5m (£18.1m) for a total of $57m.
Swift and Harris's individual incomes place both of them within the Celebrity 100 index's top 20 earners.
As well as sponsorship deals with brands including Diet Coke, Swift's smash hit album 1989 and it's accompanying world tour have boosted her wealth over the last year.
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The star recently agreed to stream the LP on the new Apple Music service, after the tech firm reversed their decision not to pay artists during the three-month free trial period for customers.
I just played a gig inside a giant owl and my girl just changed the entire music industry what a day
— Calvin Harris (@CalvinHarris) June 22, 2015
Harris's latest album Motion has delivered a number of hit singles, and the Scottish star has also signed lucrative contracts with Armani and Hakkasan Group.
Watch the star-studded video for Taylor Swift's latest single 'Bad Blood' below:
