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Wudilii Est. 2019
Case Study 2025 12 31

When the Mortgage Rate Went Up: One Family's Budget Adjustment

A structured response to a sudden fixed cost increase

By Dearbhla Sweeney
When the Mortgage Rate Went Up: One Family's Budget Adjustment

In mid-2023, Geraldine and Tomás Brennan received notice that their variable mortgage rate was increasing. The change added €340 per month to their repayment. They had no obvious slack in the budget and no savings large enough to absorb the difference indefinitely. They had about six weeks before the new rate took effect.

The first step: a full spending review

Geraldine exported twelve months of transaction data from their bank and categorised it. The process took about three hours. They identified €190 per month in spending that was either forgotten, duplicated, or genuinely discretionary — streaming services they rarely used, a gym membership Tomás had not activated in four months, and a recurring food delivery habit that had crept up to €220 per month.

The remaining gap

After cutting €190, they still faced a €150 shortfall. They decided to reduce their monthly pension top-up contribution temporarily — not eliminate it, but reduce it from €200 to €80 per month — with a specific plan to restore it within eighteen months as their fixed expenses shifted. They documented this decision in writing to hold themselves to it.

Where they are now

Fourteen months later, the pension contribution is back at €160 per month and rising. The food delivery budget is now fixed at €80 per month. The adjustment was uncomfortable for about three months, then became routine. No credit was used during the transition.

What the numbers show

78%
of families with a written monthly budget avoid short-term debt more consistently
Across Wudilii webinar participants surveyed between 2021 and 2024, those who documented their spending targets were far less likely to rely on credit for routine expenses.
3.2×
more likely to have an emergency fund after 12 months of structured budgeting
€340
average monthly overspend identified by participants in their first budget audit
6 wks
typical time before new budgeting habits become consistent, based on participant self-reports

Before tracking our spending, we genuinely had no idea where the money went each month. It took about two months of consistent recording before we could see clear patterns — and then the adjustments felt obvious rather than painful.

Orla Fennelly Wudilii webinar participant, Limerick
4,800+ participants across Ireland have attended Wudilii's family budgeting webinars since 2019
31 counties represented among registered participants, including rural and remote areas with limited local access to financial education
8 hrs avg total live session time participants complete before reporting measurable change in budgeting confidence

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