When do you decide that today is the day X on which you want to rebalance to maintain your original composition?

Instead of fixed values, I would prefer to set limits, e.g. 20 - 30 %.
(in the overall calculation, this will result in < 100% oder >100%)

I don't have any crypto, but I would try to avoid the tax burden (1-year holding period). With your amounts, I assume smaller sums and as the previous posters have said, you can alternatively simply adjust the savings plans or let them run as before.

Things could look different in a few weeks: Bitcoin crashes, shares rise.
➡️Würdest will you then sell your ETF to buy Bitcoin to maintain the composition?
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@MoneyISnotREAL My current thought would have been to sell part of my BTC position in the 95-100k range.
If it were to rise further, I would let my savings plan continue as normal or buy a little more in the event of a setback, as I would have a little more to invest thanks to the upcoming Christmas bonus.

My ETF position is currently still being built up. The current weighting is ETF/BTC/shares with 50/26/24.

Unfortunately, I'm from Austria and we no longer have a holding period. 🥲
So the holding period wouldn't really be relevant.

I should finally crack the 10K in my portfolio by the end of the year and actually wanted to be a little closer to my target weighting by then. BTC has accelerated the whole thing quite a bit in the last few weeks 😁

As my ETF position is generally set to grow even more, a setback in BTC and a rise in equities/ETFs would actually be an advantage for me.
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@jimtengo An alternative to selling and rebalancing would be a (partial) stop-loss sale.

10,000 will hopefully be significantly more one day and I think you are already thinking far too much about the weighting.

In my opinion, you can just let everything continue as it is and if you want to take profits on BTC, then go for it. It can go up or down. Who knows...

You'll always be smarter tomorrow than you are today. 🤷