The 89% Problem: Why Almost Everyone Underestimates What They Spend on Subscriptions

Ask someone how much they spend on subscriptions each month and they'll give you a number. Ask them to actually add it up, and the number changes. It always goes up, and usually by more than they'd guess.

The study that measured the gap

In 2021, the consulting firm West Monroe surveyed 2,500 US consumers for its "State of Subscription Services Spending" report. Each person estimated their monthly subscription spend, then itemized it service by service.

• 89% underestimated what they actually spent
• 66% were off by more than $200 a month
• 13% were off by more than $400 a month

West Monroe ran the same survey in 2018, and the gap had gotten wider by 2021 — not narrower. People weren't getting better at tracking this. They were getting worse, even as they spent more.

The study is US-based, so the dollar amounts won't translate directly to a European budget. But the underlying mechanism — confidently underestimating recurring costs — isn't a US quirk. It shows up wherever subscriptions do.

The UK numbers aren't any better

Citizens Advice, the UK's national consumer rights charity, found that 13 million people in the UK have been charged for a subscription they didn't mean to sign up for, wasting an estimated £800 million between them. Separately, 47% of Brits said they'd been caught out by a forgotten annual subscription — the kind that renews once a year and is easy to lose track of between charges.

Widen the lens to Europe and it holds. YouGov surveyed subscribers across 17 markets and found only 38% had used all of their active subscriptions in the past six months. Put differently: for most subscribers, something on their card was billing quietly while going completely unused.

Why this happens to careful people too

This isn't a discipline problem. It's a design problem.

Individual charges are too small to register. A €9.99 line item doesn't feel like real money the way a €300 purchase does — but ten of those add up to nearly €100 a month without a single charge ever feeling significant on its own.

Billing dates are scattered across the calendar and across payment methods. One renews on the 3rd, another in November, a third through the App Store instead of a card. There's rarely one statement where the full picture shows up at once.

Cancelling is harder than signing up, on purpose. Signup is one click. Cancelling often means hunting through settings menus or sitting through a "wait, are you sure?" flow built to make you give up halfway. That friction protects revenue, and services know it.

And free trials convert silently. A two-week trial that felt free turns into a real charge the moment nobody remembers to cancel it, and by the second month it's just another line nobody questions anymore.

None of this requires anyone to be careless. It just requires a normal amount of inattention applied to a system built to reward it.

What the gap actually costs

Take the West Monroe number: 66% of people off by more than $200 a month. Even assuming the real gap in Europe runs smaller, this isn't a rounding error — it's a spending category large enough to matter.

A €150 monthly gap is €1,800 a year. Most households would notice that instantly if it landed as one annual bill. It goes unnoticed only because it never does.

Closing the gap

The fix isn't complicated. It just requires doing the one thing most people skip: putting every subscription in front of you, in one place, at the same time.

Pull the last 60-90 days of bank and card statements and list every recurring charge, no matter how small. Check the App Store and Google Play separately — these rarely show up clearly on bank statements and are one of the easiest categories to forget entirely. Add up the annual cost, not the monthly one; a €4.99 charge looks negligible until it's €59.88 a year. Flag anything not used in the last month — on its own, this filter catches most of the obviously wasted spend. Then set a recurring check-in, quarterly is enough, because the West Monroe data shows the gap grows over time as new subscriptions pile onto old ones nobody cancelled.

Doing this once fixes today's problem. The habit is what keeps it fixed.

The 89% figure isn't really about financial discipline. It's what happens by default when recurring costs are split across a dozen services, a dozen billing dates, and two or three payment methods, with nothing forcing them into one view.

Most of that gap closes the moment someone actually sees the full list.