Size Matters

I spent my twenties and thirties making sure I’d never again depend on someone else for rent money. Watching a mother struggle financially as a single mom will do that to you.

So when I built my current relationship, my partner and I set it up on purpose: separate accounts, a shared account we each fund equally, full autonomy over what’s “mine” and what’s “his.” Not because we don’t trust each other. Because of something I know about money and relationships that most couples never say out loud.

Recent research just backed it up in a way that surprised even me.

Psychologists Minha Cho, Emily Impett, and colleagues, publishing in the Journal of Social and Personal Relationships (2020), tracked couples’ relationship quality at the start of the study and again 3.5 months later. In a second study, they brought couples into the lab and had trained observers rate how partners actually talked to each other. The twist: it wasn’t whether one partner earned more that predicted trouble. It was the size of the income gap itself — regardless of who was ahead. Bigger disparities predicted steeper declines in relationship quality over time, and those same couples showed more visible negative emotion when researchers watched them talk.

So what: We’ve all absorbed the assumption that “she probably feels bad because he makes more” — or vice versa. Wrong lens. It’s not about who’s on top. It’s the gap itself, quietly running in the background of every dinner check, every vacation decision, every “who’s got this one” moment, that wears down closeness.

Here’s what I’d ask you to sit with today: Do you and your partner know the actual size of your income gap? Not roughly — the number. And have you ever talked about what that number means for how you split things, decide things, or feel about things?

Most couples avoid that conversation entirely. This research suggests avoiding it doesn’t protect the relationship. Naming the gap might be what actually does.

What’s your money-and-relationship rule? Tell me in the comments — I read every one.

Full study: journals.sagepub.com/doi/abs/10.1177/0265407520907969