Offer your thoughts or opinion on the input financial query or topic using your financial background.

Buying and selling the same stock
Unfortunately, we don't know your country, but I'd guess "Not US" with the hint being your use of the word bugger in a comment.  Realized profits are taxed by all tax authorities I'm aware of, i.e. the Tax Man in every country. Annually, so that you can let the profits run during the year, and offset by the losses during that year.  The exception is within a qualified retirement account. Many countries offer accounts that will let you do just what you're suggesting, start with XXX number of Quatloos in your account, trade for decades, and only take the tax hit on withdrawal. In some cases there's an opportunity to fund the account post tax, and never pay tax again. But to repeat, this is with a retirement account, not the usual trading accounts.