Welcome to the sub, u/Woahhno . I see you are looking to do some math calculations for wash sales. I'll provide you with some information. Let's start with the wash sale definition. The IRS defines a wash sale as a sale or other disposition of stock or securities on which the seller realized a loss within a 61-day period (beginning 30 days before and ending 30 days after the date such sale or disposition took place) and replaces it with stock or securities that are "substantially identical." More specifically, the wash-sale rule states that the tax loss will be disallowed if you buy the same security, a contract or option to buy the security, or a substantially identical security. I recommend reviewing a few resources on our website to understand the wash sale topic better. I've copied links for a couple of articles for you below. Wash sale: Avoid this tax pitfall Wash-sale rule: What to avoid when selling your investments for a tax loss Now that we defined it, let's look at a practical example of a wash sale. Assume that you purchased 100 shares of XYZ Company for $30 per share and sold them for $27 per share on March 20. You then repurchased the shares on April 10 when the shares were trading at $33 per share. Since the transaction occurred within the 30-day wash sale period, the $300 loss is a wash sale and would be disallowed by the IRS. The adjusted basis for the replacement shares is $3,600, which is the addition of the $3,300 ($33 x 100) and the $300 loss that was disallowed. Therefore, taxes on any future sale will be figured as though you had retained the original shares. As a reminder, Fidelity does not provide tax advice; therefore, if you have questions on how wash sales will affect your taxable situation, we recommend working with a qualified tax advisor. We're glad you stopped by today. I see you have already started exploring the community discussions, so please continue to participate as you wish. Should you need us, please do like you did here today and drop us a post. We'll be happy to help you. More on reddit.com

Hi u/Diligent_Elk_9826 , welcome to our sub. I notice it's your first post in our community wanted to let you know it's good to have you here. It's important to talk about wash sales first, as it may clear up what you're trying to accomplish. According to the IRS, a wash sale is a sale or other disposition of stock or securities on which the seller realized a loss and within a 61-day period (beginning 30 days before and ending 30 days after the date such sale or disposition took place) replaces it with stock or securities that are "substantially identical." More specifically, the wash-sale rule states that the tax loss will be disallowed if you buy the same security, a contract or option to buy the security, or a substantially identical security. Wash Sale Rule When a wash sale occurs, all or a portion of any loss realized at the time of the sale may be disallowed. The amount of the disallowed loss will automatically be added to the cost basis for the purchased shares. This cost basis adjustment is permanent for shares and does not go away. To view wash sales and any adjusted cost basis on Fidelity.com, you can visit both your closed positions page and your positions page, depending on the situation. Check out IRS Publication 550 for more information on wash sales. IRS Publication 550 We'd be more than happy to look at a specific transaction to help you understand. Please send us a Modmail using the link below, and we will enter a secure environment to review your account. Message the Mods Thanks again for stopping by. Feel free to let us know if you have any other questions. More on reddit.com

https://www.timeanddate.com/date/dateadd.html Enter the date of the sale as the "start date." Then add (and subtract) 31 days from that date. The result is the first "safe" day you can buy something substantially identical without triggering a wash sale. More on reddit.com

Your broker should have it for you if you use a reputable one. More on reddit.com