What's Dragging Your Net Worth Down? The Hidden Debts

Most people, asked to list their debts, will name three: mortgage, credit card, maybe a student loan.

Most people have more than three.

Buy-now-pay-later balances. The agreed overdraft that's never quite cleared. The tax owed on next January's self-assessment. The £1,800 you borrowed off your brother for a deposit. The car finance with three years left on a vehicle worth less than the outstanding loan. The credit card that "always gets cleared next month" but somehow never quite does.

These aren't accounting tricks. They're real debt with real impact on net worth. The problem is they get classified mentally as something other than debt, which is why they're the most reliable destroyer of personal balance sheets.

This is the practical look at the liability side. What actually counts, what people forget, the difference between debt that builds wealth and debt that drains it, and what to do once you've added it all up. (If you want the broader framing of how net worth works, our hub guide covers it.)

The mental accounting problem

Mental accounting is the cognitive tendency to treat money differently based on how it arrives or where it sits.

A £5,000 tax refund feels like found money, even though it's just a return of money you overpaid. A monthly £80 phone contract feels like a subscription, even though the £960 annual commitment is a fixed liability. A Klarna payment plan feels like flexibility, even though it's a loan with terms.

The same effect operates on debt. A mortgage is debt because the word "mortgage" makes the category obvious. A buy-now-pay-later balance is debt that the user mentally classifies as "spreading out a payment", because the marketing was designed to invoke that frame.

Net worth has no time for mental accounting. Either you owe the money or you don't. Either it's enforceable or it isn't. The list of what counts is shorter than the list of what people forget.

What actually counts as a liability

A useful definition: a liability is any obligation to pay money that can be enforced against you.

That covers the obvious cases:

• Mortgage balances
• Car loans, PCP, HP, finance lease
• Student loans (UK income-contingent included)
• Credit card balances on the snapshot date
• Personal loans, payday loans, peer-to-peer borrowing
• Overdrafts (the negative balance you're actually carrying)
• Buy-now-pay-later balances

And the less obvious:

• Tax bills you know you'll owe (self-assessment shortfall, US estimated tax, equivalents)
• Money owed to family or friends (the informality doesn't change the obligation)
• Council tax arrears, unpaid utility bills
• Subscriptions and contracts with cancellation penalties
• Outstanding invoices you owe to contractors, accountants or other suppliers

The principle: if it's enforceable and unpaid, it's a liability. The form of the enforcement (court, credit reference, debt collection, social) doesn't change the maths. We treat boundary cases more fully in What is net worth.

Good debt vs bad debt

Not all debt is equal. The shorthand "good debt vs bad debt" is useful, even if it's slightly too simple.

Wealth-building debt. A mortgage on a property that's appreciating is debt that's building net worth, because the asset side moves faster than the liability side. The interest is the cost of getting there. A business loan that finances expansion is wealth-building debt if the returns exceed the interest. Same logic applies to a student loan that produces materially higher earning power.

Neutral or preserving debt. A 0% interest credit card balance you'll clear by the promotional end date is essentially free borrowing. A balance transfer used strategically can save real money on interest. These aren't wealth-building, but they're not destructive either.

Wealth-draining debt. Buy-now-pay-later balances on consumer items that depreciate immediately. Credit card balances at 24% APR that roll month after month. Payday loans at three-figure APRs. Car finance on a vehicle that drops 30% in the first three years. These are debts whose cost exceeds any return, and they pull net worth down.

The same nominal amount of debt has very different net worth implications depending on the category. £30,000 of mortgage at 4% on a property growing at 5% is different from £30,000 of credit card debt at 24% APR. Both show up on the liability side as £30,000. The trajectory is opposite.

The liabilities people forget

The asset side gets the attention. The liability side is where the silent accumulation happens.

Buy-now-pay-later balances. Klarna, Clearpay, Affirm, Afterpay, PayPal Pay in 3. These don't show up on most credit reports. They feel like payment splitting, not debt. The cumulative balance across multiple BNPL providers can be substantial, and the user has no easy way to see the total. Worth checking each provider directly at snapshot time.

The "I always clear it" credit card. The user genuinely believes they pay in full monthly. The snapshot date balance tells a different story. Even if you do clear monthly, the balance on the 31st (or whatever your snapshot date is) is part of the liability side that day. The honest move is to include it.

The agreed overdraft. £500 of agreed overdraft you've been using as a buffer for years. Not technically a loan, but every pound below zero is a pound you owe the bank. Charges apply if the balance stays negative. Include it.

Car finance on a depreciated vehicle. A car loan with three years left on a vehicle that's already lost 30% of its value. The asset side is the depreciated car value; the liability side is the original loan minus payments made. The net position is often negative. Both sides need to be on the balance sheet to see the true position.

Subscriptions and contracts with cancellation penalties. A two-year mobile contract with 14 months left has a contractual liability over those months, even if you forget about it. Same with annual gym memberships, software contracts, vehicle leases. The full remaining commitment is the liability.

Tax owed. Self-employed people who know they'll have a £6,000 tax bill in January but the snapshot is in November. That's a £6,000 liability in November, not just in January. The accrual matters.

Family loans. £3,000 borrowed from a parent for a deposit. There's no paper. There's no schedule. There may not be interest. The obligation exists anyway. Include it.

The debt-to-asset ratio

Once the liability side is honest, a useful follow-on metric is the debt-to-asset ratio.

Debt-to-assets equals total liabilities divided by total assets. A 25% ratio means you owe a quarter of what you own. 50% means half. Over 100% means you owe more than you own, which puts your net worth in negative territory.

Some benchmarks (rough, not prescriptive):

• Under 25%: low leverage, conservative position
• 25-50%: moderate leverage, normal for households with a mortgage in their first decade
• 50-75%: high leverage, fine if the debt is mortgage on an appreciating asset, concerning if it's consumer debt
• Over 75%: stressed, especially if any of the debt is high-interest consumer credit
• Over 100%: negative net worth

The composition matters as much as the ratio. A 60% debt-to-asset ratio made up of mortgage on a primary residence is in a different position than 60% made up of credit cards and car finance. The first is leveraged property exposure. The second is a problem.

Negative net worth is more common than people think

Negative net worth happens when total liabilities exceed total assets. The total of what you owe is bigger than the total of what you own.

This is more common than people assume, particularly in younger age bands. Some categories where it shows up:

• Recent graduates with large student loans and limited savings
• Households in early years of a mortgage where market price has dipped below outstanding loan
• People with significant credit card debt and few investments
• Anyone with a recent unexpected medical or legal bill that wasn't insured against

Being in negative net worth territory isn't a moral failing. It's a position. The question is what the trajectory is. A 26-year-old with -£15,000 net worth on a graduate scheme with steady savings is on a positive trajectory; the number will turn positive within a few years. A 45-year-old with -£40,000 net worth and growing debt is in a different situation.

The mistake is not knowing where you are. Once you have an honest balance sheet, the next step is obvious: reduce the high-cost debts first, stop accumulating new ones, give the asset side time to catch up.

What to do once you've added it all up

Listing the debts isn't action. It's the precondition for action.

The standard order of attack:

Stop the bleeding. Cancel auto-renewals on subscriptions you don't use. Stop new BNPL purchases. Move credit card spending to debit. The first move is to stop the liability side growing, not to make immediate payments.

Target high-interest debts first. Credit card debt at 24% APR is more expensive than a 4% mortgage. The arithmetic says pay the high-interest one down first. Snowball methods (smallest balance first) work psychologically; avalanche methods (highest interest first) are mathematically optimal. Either is better than spreading payments evenly.

Build a small emergency fund before aggressive paydown. If you have zero buffer, an unexpected bill will force you back onto credit cards. £500 to £1,000 is usually enough to break the cycle.

Then attack the rest. Pay above minimum on the high-interest debt. Avoid new debt. Track the liability side monthly so the progress is visible.

Reassess at three months. A consistent monthly drop in liabilities is the leading indicator. The net worth figure will follow. We cover the tracking cadence in How to track your net worth over time.

This isn't novel advice. But the novelty is in seeing the picture clearly enough to act on it, which requires the honest list.

How Endute helps

Endute tracks the liability side as carefully as the asset side, which is the part most apps under-do.

Bank-connected debt accounts (mortgages, loans, credit cards) update automatically through open banking, so the liability balances are current rather than guessed. For categories that aren't bank-connected (BNPL balances, family loans, tax owed, contracts with cancellation penalties), manual entry covers the gap.

The net worth report breaks down the composition (liquid investments, illiquid wealth, debt), so the liability side is visible at a glance against the assets. The trend chart shows whether debt is shrinking, flat or growing month on month, independent of what's happening on the asset side.

For multi-country households, this is particularly useful. A UK mortgage, a German credit card and a US student loan all live on the same balance sheet, converted to one reporting currency, with a single trend line for total liabilities.

The honest version of the question

The reason this matters is straightforward.

A net worth figure that ignores half the liabilities isn't a net worth figure. It's an optimistic estimate. The point of running the number is to see the actual position, not the flattering one.

Once the liability side is honest, the rest of the financial picture clarifies. Decisions about saving, investing, spending and debt repayment have a clean starting point. The trajectory becomes possible to measure.

The hard part isn't the maths. The hard part is admitting what you owe.

Once that's done, the rest of it is straightforward.