Mariusz Invest Follow on X

Investing in the UK. With receipts.

An ordinary Brit building wealth through ISAs, dividends and a lot of screenshots. The wins, the losses and the UK tax rules that make the difference.

Mariusz Invest Weekly

Free every Sunday. My trades and dividends, the week's sector chart and one UK money story.

First issue coming soon.

Free tools

ISA · JISA · SIPP

UK Money Calculator

How long until you're an ISA millionaire, what a Junior ISA is worth at 18, and what pension tax relief adds up to.

Open calculator → P/S · P/E · EV/EBITDA

Fair Price Calculator

Pick a company, set growth and an exit multiple, and see the price range and yearly return from today.

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My receipt · October 2026

Stocks ISA£340,558
Realised profit£223,318
Dividends to date£4,229
Daughter's Junior ISA£17,023
Started from £0. Not every trade wins.

Platforms I actually use

Trading 212Where my ISA and income pie live. Free share for new accounts.
Link soon
Robinhood UKFree share when you sign up. Mine all go into $AMZN.
Link soon

Coming soon

From £0 to a £340k ISAThe e-book. Every decision, every mistake, with screenshots.
Soon