Should I use gross or net income for mortgage affordability?

For planning, use net income to judge whether the monthly repayment fits your budget. LTI-style borrowing prompts often use gross income, but approval and comfort depend on net cash flow and commitments.

Why does LTI use gross income if my bills are paid from net income?

Gross income is a simple standardized reference for borrowing prompts. Your real affordability depends on net income after tax plus recurring costs like childcare and existing loans.

What expenses should I include in a mortgage affordability check?

Include recurring essentials (utilities, groceries, transport), existing loan repayments, childcare, insurance, and a buffer for irregular costs. Treat the mortgage repayment as one part of a full monthly budget.

Is a calculator result a guarantee of approval?

No. A calculator provides estimates. Approval depends on underwriting, documentation, employment profile, credit history, and lender affordability checks.

Mortgage affordability in Ireland: gross vs net income

This guide separates two ideas that often get mixed: borrowing prompts based on gross income (like LTI) and real household affordability based on net income. Use it to plan a monthly buffer and avoid treating any single metric as a guarantee.

Mortgage calculator (estimate)Monthly budget planner LTV & LTI guide

1) Gross income prompts vs net income reality

Gross income prompts are useful as a quick benchmark, but your mortgage repayment will be paid from net income after tax. For planning, net income is the number that matters most.

If your repayment only works in a “best month” and fails in a normal month, the plan may be fragile even if a gross-income prompt looks acceptable.

2) Include commitments and irregular costs

Practical affordability checks include recurring essentials plus commitments like childcare, car loans, student loans, and credit card repayments. Add a monthly reserve for annual bills so the budget does not look artificially comfortable.

If you currently pay rent, consider modelling the difference between rent and mortgage repayment as a buffer or savings capacity.

3) Use a stress scenario to plan a buffer

Use a stress-tested repayment estimate to check downside risk. The goal is not to “pass” a rule, but to understand what would need to change if rates were higher: deposit size, loan amount, term, or savings buffer.

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