Consolidation replaces several debts with a single one. Whether that improves the position depends on three variables that move independently and are easily confused with each other.
Rate, term and payment are separate levers
The interest rate determines the cost of borrowing per year, the term determines how long it is borrowed for, and the monthly payment follows from both together.
A consolidation loan can lower the monthly payment through a better rate, a longer term, or a combination. Only the rate reduction reduces the total cost of the debt.
Marketing tends to emphasise the payment, because that is the number felt each month. The total repaid is the figure that determines whether the transaction was worthwhile.
A longer term can cost more at a lower rate
Stretching repayment over more years reduces each instalment but increases the number of periods over which interest accrues on an outstanding balance.
A borrower moving high-rate card debt to a lower-rate loan over a much longer term can end up paying more in total despite the improved rate.
Comparing the total amount payable under each arrangement, rather than the monthly figure, is the only way to see which direction the change actually goes.
Security changes the nature of the obligation
Consolidation loans secured against property carry lower rates because the lender has recourse to an asset if payments stop.
That lower rate is purchased by converting unsecured debt, where the worst outcome is a damaged credit record and collection activity, into debt where the home is at risk.
The arithmetic can look attractive while the risk profile changes substantially, and the two are rarely presented side by side.
Fees are part of the comparison
Arrangement fees, valuation costs and early repayment charges on the debts being cleared all reduce the benefit and are frequently added to the new balance rather than paid upfront.
Adding them to the loan means paying interest on the cost of the transaction for its whole term, which is easy to overlook when the fee is expressed as a single figure.
A consolidation that improves the rate by a modest margin can be entirely consumed by these costs, particularly on shorter terms.
The behavioural risk is the largest one
Clearing card balances leaves those accounts open with full limits available, and the borrower now has both a loan and unused credit.
Where the underlying spending pattern is unchanged, balances rebuild alongside the consolidation loan and the total obligation ends up larger than before.
Consolidation solves a pricing problem, not a cash flow problem. Where the difficulty is that outgoings exceed income, restructuring the debt postpones the issue rather than resolving it.