Alyson Hannigan's net worth is a whopping $40 million, according to Celebrity Net Worth. Per the website, most of her worth comes from her solid TV work and recurring role in the "American Pie" movie franchise. At the peak of her career, Hannigan earned an estimated $225,000 per episode of "How I Met Your Mother."

In 2002, Hannigan and her future husband Alexis Denisof (they married in October 2003) bought a $1.96 million Spanish bungalow in Santa Monica, California. The home was over 4,000 square feet, with five bedrooms and four bathrooms. However, the couple put it up for sale in 2018 for $5 million (or to rent for $17,500, via Realtor).

In 2014, Hannigan bought an Atlanta penthouse to live part-time, but eventually listed it for about $1.3 million (via ABC News). One year after her Atlanta purchase, Hannigan and her family purchased an $8 million Encino mansion, a three-acre compound with five bedrooms and 6.5 baths that features a great room, media room, and open kitchen (via Realtor).