IE
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EF-first NW
€83,020
Invest-first NW
€84,065
Difference
€1,045
Should you build a bigger emergency fund or invest the surplus? Compare both strategies side-by-side.
Building an emergency fund provides security but means money sits in low-interest savings rather than being invested. This calculator compares the outcomes of building a larger emergency fund first versus investing surplus cash immediately.
Enter your monthly surplus, current emergency fund, target fund size, and expected investment returns. The tool models both strategies over time, showing your total net worth under each approach and the point at which the invest-first strategy overtakes the fund-first approach.
EF-first net worth
€83,020
Build 6m fund first
Invest-first net worth
€84,065
Invest surplus immediately
Difference
€1,045
Invest-first wins
Return at 9.0%
€91,214
+€7,149 vs baseline
Return at 5.0%
€77,760
€-6,305 vs baseline
A ±2% change in annual return can significantly alter the long-term difference between strategies.
The Opportunity Cost of Cash
Every €1,000 kept in cash instead of invested at 7% could earn €967 over 10 years. This calculator quantifies that cost for your numbers.
Why 3-6 Months?
Irish financial advisors recommend 3-6 months of essential expenses as an emergency fund. Less than 3 months risks shortfall; more than 6 months starts costing significant investment growth — especially with DIRT at 33% eroding cash returns.
DIRT Eats Cash Returns
Irish deposit interest is taxed at 33% DIRT. A 3% savings rate becomes ~2% after tax — while investments like global ETFs have historically returned 6-9% before taxes.
The Split Strategy
A balanced approach: invest 50% of your surplus immediately while using the other 50% to build your emergency fund. Once funded, redirect all surplus to investments — giving you market exposure with adequate protection.
Conventional wisdom says build a 3-6 month emergency fund first, then invest. This calculator shows the opportunity cost of over-funding your emergency fund (keeping more than 6 months of expenses in cash) versus investing the surplus immediately.
Most Irish financial advisors recommend 3-6 months of essential expenses. If you have stable employment and low expenses, 3 months may suffice. Self-employed or variable-income workers should aim for 6-12 months as a safety buffer.
Build a 3-month minimum emergency fund first, then start investing your surplus. Once invested, you can gradually build to 6 months in the emergency fund. This gives you market exposure early while maintaining adequate protection.
DIRT (Deposit Interest Retention Tax) at 33% is deducted from interest earned on Irish savings accounts. A 3% interest rate becomes about 2% after DIRT. This makes holding excess cash even more costly compared to investing.
Every €1,000 kept in cash instead of invested could earn 5-8% annually in the market. Over 10 years at 7%, that is nearly €1,000 in lost growth. This calculator quantifies that opportunity cost for your specific numbers.
Yes — the "invest-first" scenario in this calculator shows exactly this approach: maintain a minimum buffer while investing surplus immediately. Many Irish investors use a split strategy: 50% to emergency fund, 50% to investments.