A new study has found that being part of a couple is more expensive than being single. It can run you up to an extra $400 a month.

Even though single people tend to spend more going out, couples rack up bills on gifts for each other, dinner dates, expensive getaways and pricey rent for two.

A third of people in relationships incorrectly assume that they are saving money by splitting their bills with someone else when in fact they’re running up a higher tab than they would be if they lived alone.

While those in a relationship shell out big for romantic vacations, single people do spend a lot on trying to look their best, from new clothes to beauty products and self pampering.