Debt consolidation, credit scores and HEM: what really changes

Thinking about rolling credit cards and personal loans into your mortgage and worried what it does to your next loan? Done well, debt consolidation can lift borrowing power by cutting assessed repayments, but it can also hurt your credit score and future serviceability if you keep limits open or extend terms too far. The key is understanding how credit score, HEM and lender buffers interact before you touch a thing.

In Australia, lenders assess new loans using: (1) your credit score and file, (2) your actual debts and repayment history, (3) a minimum living expense benchmark called HEM, and (4) APRA’s 3% interest rate buffer. Debt consolidation changes several of these levers at once, so you need to plan it like a small project, not a quick fix.

Debt consolidation changes how your debts flow through a lender’s calculator, not the HEM benchmark itself.

How lenders actually assess you after consolidation

The four big levers: HEM, buffers, debts and score

When you apply for a new loan after consolidating, most mainstream lenders will:

1. Pull your credit report and score.
2. List every facility (home, investment, personal, cards, BNPL, leases).
3. Run a serviceability calculator using a stressed rate (usually ~3% above actual) in line with APRA guidance.
4. Use the Higher of: your disclosed living expenses or the HEM benchmark for your household type.

HEM (Household Expenditure Measure) is a minimum living cost floor. Cutting debt doesn’t reduce HEM; it only helps if it reduces monthly repayments or limits. That’s why closing cards and personal loans after payout is critical, not optional.

What improves – and what can get worse

After a well‑planned consolidation, lenders may see:

• Lower monthly liabilities → higher borrowing power.
• Cleaner structures (separate splits for home vs investment or business) → easier tax and risk assessment.

But they might also see:

• A cluster of new credit enquiries → temporary score drop and more questions.
• A much larger home loan → higher exposure to your property and income.

If you’ve already been knocked back, this is where a repair plan like the one in [/insights/bank-said-no-refinance-workarounds-repair-plan] can be the difference between a yes next year and more short‑term fixes.

How consolidation changes your serviceability maths

Before vs after: a worked example

Assume a household with $140,000 after‑tax income, a $600,000 owner‑occupied loan at 6.2% P&I (25 years left), and the following consumer debts:

• Credit cards: $20,000 limit (assessed at 3% per month = $600)
• Personal loan: $20,000, 12% over 5 years → actual repayment ≈ $445

Total assessed consumer repayments: about $1,045/month.

You roll the full $40,000 into the home loan as a separate 7‑year split at 6.2% P&I.

• New $40,000 split over 7 years → ≈ $588/month.
• Cards closed, personal loan closed, limits reduced to $0.

On most calculators, you’ve just reduced assessed monthly liabilities by roughly $457 ($1,045 – $588). With APRA’s 3% buffer on top, this can translate into tens of thousands of extra borrowing capacity, depending on the lender’s model.

Comparing consolidation choices

*Illustrative only. Actual impacts depend on lender policy.

For a step‑by‑step structure that avoids resetting 30 years, see [/insights/step-by-step-consolidate-debts-using-home-equity-no-restart].