Calculator Guide
VOO vs CSPX
VOO and CSPX are both commonly used for S&P 500 exposure, but they are not identical in structure. VOO is U.S.-listed, while CSPX is an Ireland-domiciled UCITS ETF listed on the London Stock Exchange. This page explains the practical differences and how to compare them with a DCA backtest.
What VOO and CSPX are
VOO is the Vanguard S&P 500 ETF listed in the United States. It is designed to track the S&P 500 Index, which represents large U.S. companies across major sectors. CSPX is an iShares Core S&P 500 UCITS ETF share class that is Ireland-domiciled and commonly traded on the London Stock Exchange. Both seek broad U.S. large-cap exposure, but the fund domicile, exchange listing, tax treatment, dividend policy, trading currency, and broker availability may differ for each investor.
Who may find this comparison useful
A VOO vs CSPX comparison can be useful for investors who want S&P 500 exposure but have access to different markets or account types. U.S.-based investors may naturally see VOO on U.S. platforms. Non-U.S. investors may compare UCITS ETFs such as CSPX because of local platform availability, Ireland fund domicile, accumulating share classes, withholding-tax considerations, estate-tax concerns, or settlement currency. None of those factors makes either ETF universally better; they simply change the questions a user should study.
Example use case
A user might compare investing $500 per month into VOO versus CSPX from 2018 to 2025. The comparison tool applies the same monthly amount and same date range to both assets, then shows final value, total return, profit, annualized return estimate, drawdown, and final-value difference. This helps separate asset and data behavior from contribution assumptions. The result is still only one historical window, not a rule for the future.
How the DCA backtest works
Where historical CSV data is available, the calculator uses monthly prices generated from historical daily adjusted close data. A monthly contribution is converted into estimated shares for each month, and the accumulated shares are valued at the final monthly price. If data is unavailable for one asset, the tool clearly labels sample data. Because VOO and CSPX can trade in different markets and currencies, users should pay attention to display currency, source data, and whether the data reflects the exact share class they intend to study.
Currency, tax, dividend, and platform limitations
VOO and CSPX may differ in trading currency, dividend treatment, fund expenses, spreads, withholding tax, estate tax exposure, local tax reporting, broker access, and exchange hours. CSPX is often discussed as an accumulating UCITS ETF, while VOO is a U.S.-listed ETF that generally distributes dividends. Actual outcomes can vary by country, broker, account type, dividend reinvestment assumptions, currency conversion cost, and execution price. The calculator cannot model every local tax rule or platform constraint.
Risk and disclaimer
This comparison is educational only and is not financial advice, tax advice, legal advice, or an investment recommendation. Neither VOO nor CSPX is always better for every investor. Past performance does not guarantee future results, and historical prices may be delayed, adjusted, incomplete, or different from official fund NAV or broker records.