Consolidating several debts into one loan is presented as a way of reducing debt. It reorganises the obligation; whether it reduces the cost depends on the terms.
The balance transfers, it does not shrink
A consolidation loan repays existing balances and replaces them with a single new one of equivalent size, often plus arrangement fees.
Nothing has been forgiven and nothing repaid. The borrower owes the same amount to a different party under different terms.
The apparent improvement comes from a lower monthly payment, which is generally produced by a longer term rather than by a lower total cost.
Rate and term move in opposite directions
A lower interest rate genuinely reduces cost, and consolidating expensive revolving balances into a cheaper instalment loan can save a substantial amount.
Extending the term increases total interest even at a lower rate, because interest accrues for longer on a balance that reduces more slowly.
Comparing the total amount payable over the life of each arrangement, rather than the monthly figure, is the only way to see which effect dominates.
Security changes the nature of the risk
Consolidation secured against property attracts a lower rate because the lender can recover against the asset if payments stop.
That converts unsecured obligations, where the worst outcome is a damaged credit record and enforcement action, into obligations where the home is at risk.
The lower rate is compensation for that transfer of risk, and it is a genuine trade rather than a straightforward improvement.
The behavioural risk is the main failure mode
Paying off credit cards leaves them available, and balances frequently rebuild while the consolidation loan is still being repaid.
The borrower then carries both, in a worse position than before, which is the most common way consolidation makes things worse rather than better.
Closing or restricting the cleared accounts at the point of consolidation removes the mechanism, and lenders that require this are protecting themselves and the borrower simultaneously.
What the arrangement genuinely provides
A single payment on a fixed schedule is easier to manage than several with different dates and minimums, and missed payments become less likely.
A defined end date also replaces the open-ended character of revolving debt, which changes how the obligation is experienced even when the cost is similar.
Those are real benefits, but they are administrative and psychological rather than financial, and describing them accurately avoids the disappointment that follows overstating them.