It depends a lot on which tax bracket you are in as well as short term or long term etc.
Let's take an hypothetical example.
Say you bought a 1000 shares of TSLA for $100 each. TSLA went up 5X since then, so $500 per share today. Hypothetically, it is expected to spike to 2X then drop by 30% from the peak.
Total shares 1000
Purchase price $100,000
Current value $500,000
Peak value $1,000,000
Stock price after 30% drop from peak $700
1. If you sold at the peak perfectly, you would make a profit of $900,000.
- If this was short term gains, the taxes on this would depend on your tax bracket and the state of residency. For me,this would be 37% federal and 13.3% CA state tax - approximately 50%. You are left with 450,000 in profit after paying tax. Add the initial cost basis of 100,000 for total of $550,000 to buy back shares after the drop. So total shares at the end = 785 shares.
- So, with an overall tax liability of 50%, trying to buy back after a 30% drop actually gives you less shares than if you simply HODL
- If this was long term gains, the taxes would be 20% for federal and 13.3% for CA state ~ total 33%. Now you are left with $603,000 in profit after paying taxes. Add the initial cost basis of 100,000 for total of $703,000 to buy back shares after the drop. So total shares at the end = 1004 shares.
- So, in this case, the reward for timing the market perfectly to sell at the peak and to buy after a 30% drop is a measely 4 shares. Not really worth for me.
So, my general conclusion is that if one wants to sell at peak and buy back after a drop in a taxed account, then this is only profitable if the expected drop exceeds your total tax bracket. Since I am in an overall 50% short term and 33% long term tax bracket, playing this game is not worth it, especially since my final goal is to accumulate shares long term.
The math for your case may be different of course, dependent on your tax bracket.
If there are any flaws in my math, please point these out to me. Maybe I am missing a highly profitable venture due to tax considerations.