— For UK earners £50k+
You earn more than ever. So why does it feel like less?
You're not bad with money. You've just never seen the full picture. Theo runs the actual maths on where your salary goes — tax, housing, essentials, savings, and the bucket nobody can name. The leak isn't coffees. It's the £40 here, the £60 there, the subscriptions you forgot, the lifestyle ratchet that never went down again.
Summer 2026 · Free · No card
Or find your leak first ↓
The thing nobody says out loud
8%
Less than Gen X earned at age 30, in real terms. Millennial earnings at 30 are 8% below the previous generation's — while housing, childcare, and education costs are dramatically higher. The maths is bleaker than your salary suggests. The feeling isn't in your head.
Source: Resolution Foundation, 2023. Homeownership for 25-34s dropped from 67% (1991) to ~36% today. You're running a harder race on a quieter income. Knowing this changes the question from “what's wrong with me?” to “what should I actually do?”
Run your numbers
Where does it actually go?
The next pay rise absorbs into lifestyle within 90 days. Find the leak before it lands.
£75,000
£1,500 / mo
£900 / mo
£200 / mo
The bucket nobody can account for
£1,905 / mo
That's what's left after tax, housing, essentials, and what you save. Not coffees. Not Deliveroo. It's the £40 here, £60 there, the subscriptions you forgot, the lifestyle-creep ratchet. £22,857 a year you can't name.
Where your £6,250/mo gross actually goes
Tax & NI
Locked. You don't choose this.
£1,745
28% of gross
Housing
£1,500
33% of take-home
Hard essentials
£900
20% of take-home
Savings / investing
Under 5% — UK median, but well below where you should be at this income.
£200
4% of take-home
Unaccounted (the leak)
£1,905
42% of take-home
What the leak is actually worth
Cut half the leak. Redirect to a S&S ISA. Compound 30 years.
£759,310
That's £952/mo — half of your unaccounted — into an S&S ISA at 5% post-fee real returns, compounded 30 years. You don't need to find more money. The money's already there. It's just going somewhere you can't name.
Want Theo to find the leak on your numbers — and tell you exactly which two or three structural changes redirect it?
Calculator uses 2026/27 UK tax bands (England/Wales/NI). Take-home before pension contributions and student loan. Compound projection assumes 5% post-fee real return on S&S ISA — conservative based on long-run UK equity returns. Past performance is not a guide to future returns. This is guidance, not regulated investment advice.
A scenario you'll recognise
Three raises in three years. Nothing in savings.
Mike, 32. Senior product designer. £75,000 in zone 2 London. Rent £1,500, hard essentials £900. He thought he was saving — checked his accounts and it was £200/month. The other £1,900 of his take-home went somewhere. He couldn't name where.
¹ Illustrative — assumes 5% real annual growth, not guaranteed.
The cost of not finding the leak
Roughly £380,000 by retirement. Same income. Same flat. One structural change.
You don't need to track every coffee. You need to find the leak.
Composite scenario, drawn from common UK lifestyle-creep situations and our user conversations. Run your own numbers above.
What Theo does
Not a budgeting app. A structural reveal.
Reads.
Your full financial life — current accounts, savings, subscriptions, ISAs, pensions, debts — through regulated Open Banking. The whole picture. Where every pound went, not just what you remember.
Thinks.
In structures, not transactions. Tax, housing, essentials, savings, and the leak. Spots subscriptions you forgot. Sees the £40-here-£60-there pattern. Names the two or three structural changes that compound — without making you feel awful about a £6 oat-milk flat white.
Watches.
Every payday. Every pay rise. Every direct debit. Tells you when lifestyle creep is starting before it absorbs the next raise. Quietly. Without dashboards you have to log into.
“I earned what I thought was a lot, lived in London, and was somehow still skint at the end of every month. I’m not bad with money. I’d just never had anyone run the actual split and tell me where it all went. Once you see it — properly see it, not guess — the fix is two or three structural moves, not a hundred small ones. That’s what Theo does.”
— Ciaran Hughes, Founder
Theo is financial guidance — not regulated advice. We hold ourselves to the standard of the FCA's Consumer Duty even though, as a guidance service, we're not required to. Encrypted at rest and in transit. Never sold.
— A closing argument.
Stop guessing where it goes. See it.
Theo finds the leak on your actual numbers — and tells you the two or three structural changes that fix it. Boring done better.
Summer 2026 · Free · No card