Crypto in a Portfolio
A crypto allocation is the share of a portfolio held in digital assets, and it has no earnings or cash flow to value it against. Sizing it from the amount you could lose completely is the only method that does not require a forecast.
Covered on this page, for traders outside the US: BYDFi, WEEX and Blofin.
Every other holding on this site can be sized against something it produces. This one cannot, so the sizing has to start from the loss rather than from the gain — which is an unusual way round and the only one that does not depend on a forecast.
How it works
A crypto allocation is a percentage of the portfolio, and the percentage does far more work here than elsewhere because the volatility is so much greater.
A 3% position in something that moves several times as much as equities contributes far more than 3% of the portfolio’s variability. Sizing by capital rather than by risk understates what has been taken on.
There are no earnings, no coupon and no rent. As with gold, the return is entirely what the next buyer pays, so no valuation model applies and the usual anchors are absent.
Sizing it
The question that works is: what percentage could go to zero without changing your plan. That number is knowable, personal, and does not require any view about the asset.
For most people it is low single digits. For some it is zero, which is a legitimate answer and one this page will not argue against.
Once it is set, write it down and let a rebalancing band enforce it. The position will grow past the target in good stretches, and trimming back is what turns a volatile holding into a manageable one — the rebalancing calculator does that arithmetic.
A worked example
Take a $100,000 portfolio with a 3% target and a 2-point band.
The position starts at 3,000. If it triples to 9,000 while everything else is flat, the portfolio is 106,000 and the weight is 8.49% — well past the band.
Trimming back to 3% means selling 5,820, leaving 3,180 in the position.
And if it then falls 80%, the loss is 2,544 rather than 7,200. The band did the work; no forecast was involved at any point.
The drawdowns
Digital assets have historically fallen far further than equities. The recovery arithmetic makes that concrete: a 50% fall needs 100% to get back, a 70% fall needs 233.33%, and a 90% fall needs 900%.
In the S&P 500 since 1950, 93% of trading days closed below the previous record with a longest wait for a new record of 7.5 years, from 1973 to 1980, and that is a far tamer market than this. Those S&P 500 figures use daily closes from 1950 to September 2026, without dividends.
Which is why position size rather than conviction is the variable that decides outcomes here.
The risks that are not price
Where and how it is held is its own risk. An exchange failure, a lost key or a jurisdictional change can affect the holding independently of the price, and none of those exposures exists for a fund held at a broker.
Several large venues exclude residents of particular countries in their own terms of use, which is worth reading before funding rather than after.
Tax treatment is generally a disposal on every sale, including coin-to-coin swaps, which is covered on the crypto profit calculator. This is educational, not tax advice.
Costs
Trading fees are charged on the buy and the sell, so a 0.5% fee each side is 1% of the position before it has moved. Each trade pays the bid-ask spread, and a thin book is worse.
Fee schedules differ substantially between venues and between maker and taker orders. The venues listed at the foot of this page publish theirs; read the current schedule rather than assuming.
The original data
Among the 24,971 unique videos collected for this site’s search study, crypto profit appears in 5 videos at a median of 175,743 views and crypto tax in 8 at 34,984.
The sizing question is the one that decides outcomes, and it is easy to lose behind the more exciting question of what a position returned.
The question: It has tripled. Let it run?
The answer is that letting it run is a decision to increase the allocation, made passively, at the point where the position is largest and the case is loudest. The band already answered it — and the band was set when nothing was at stake, which is the only condition under which this particular decision gets made well.
When it fails
The failure is a position that grew into significance without anyone sizing it. A small allocation performs, nothing prompts a trim because trimming a winner feels wrong, and two years later it is a quarter of the portfolio held by somebody who would never have chosen that weight deliberately. The subsequent decline is then a portfolio event rather than a small loss — and every step to that point was inaction rather than a decision.
The second failure is sizing by conviction. With no cash flow, conviction has nothing to anchor to.
A third is holding it on a venue that excludes you. The terms are the place to check.
A fourth is ignoring custody. A lost key is a total loss with no counterparty.
A fifth is treating coin-to-coin swaps as untaxed. They are generally disposals.
And a sixth is adding after a run. That is buying the allocation the market just gave you, twice.
Related
Gold is the other asset with no cash flow and the same sizing problem. Diversification is what a large position here quietly undoes. And risk tolerance is the input the whole sizing decision depends on.
The question that produces a sensible number is not what it might be worth. It is what percentage of this portfolio could go to zero without changing anything about your life or your plan. Whatever that figure is, it is the ceiling — and for most people it is a lot smaller than the position they actually hold.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money. Some links on this page earn a commission if you buy through them. It costs you nothing and it does not decide what appears here or in what order — how these pages are made is set out in our methodology.