Investing
Emergency fund or invest first?
Last updated 16 October 2026
Investing spare money straight away usually ends with more, but leaves you exposed if income stops. What the trade-off costs, after deposit tax and exit tax.
An emergency fund is cash set aside for essential spending if your income stops or a large bill arrives. That means rent or mortgage, food, energy, insurance and loan repayments. Building it first means investing later. The question is what that costs, and what it protects you from.
Why it is kept in cash
Emergencies don't wait for markets to recover. Job losses and market falls can come at the same time, and then investments may have to be sold at a loss. Selling an exchange-traded fund also brings exit tax on any gain into that year's tax return. Cash in an instant-access account is there on the day, and deposits are protected up to €100,000 per person per institution.
The cost of holding cash
Interest on deposits pays 33% DIRT (the tax on savings interest). Rates on instant-access accounts are usually below what investments are expected to return over time. So a full emergency fund earns less than the same money invested. That gap is the price of the protection.
An example
Someone spends €2,200 a month on essentials, has €3,000 in cash, and can put aside €800 a month. Their target is 6 months of essentials, €13,200. Cash earns 1.5% before DIRT; investments grow 5% a year before charges of 0.2%, taxed as an exchange-traded fund.
| Plan | Cash at the end of 2030 | Cash plus investments after tax |
|---|---|---|
| Fill the fund first, then invest | €13,726.05 | €53,978.41 |
| Invest everything from the start | €3,153.49 | €55,036.69 |
Filling the fund first takes 13 months. Over 5 years, investing first ends €1,058.28 ahead, assuming markets rise steadily throughout. That is the reward for spending those years with far less cash to fall back on.
How big a fund?
Base it on essential spending, not income, and allow more if:
- your income is irregular, or you are self-employed;
- one income supports the household;
- you have dependants, or an older car or house that may need repairs.
Money you are saving for something planned, like a deposit on a home, is separate. Keep it in cash too if you need it within a few years.
To run your own figures, use the emergency fund or invest calculator. For the choice beyond your emergency fund, see cash savings or investing.
Work it out
Sources
- Revenue: What DIRT rate is applicable? (33% on deposit interest) (checked 25/10/2026)
- Revenue: Deposit interest: DIRT is a final liability, no USC on deposit interest (checked 16/10/2026)
- Central Bank of Ireland: Deposit Guarantee Scheme: up to €100,000 per person per institution (checked 16/10/2026)
- Revenue: Tax and Duty Manual Part 27-04-01: offshore funds in the EU, EEA and OECD (38% rate, 8-year deemed disposal, no loss relief, no USC or PRSI) (checked 25/10/2026)
- Department of Finance: Statement by the Minister for Finance on Budget 2027: fund and life assurance exit tax 38% to 35% from 1 January 2027 (checked 25/10/2026)
General information, not tax advice. HeyPenny is not a tax agent.