topic How do you report wash sale loss disallowed (1g) from your 1099-B? in Get your taxes done using TurboTax

How do you report wash sale loss disallowed (1g) from your 1099-B?

ron — Sat, 28 Feb 2026 19:02:50 GMT

Re: How do you report wash sale loss disallowed (1g) from your 1099-B?

ReneV4 — Sat, 28 Feb 2026 23:10:47 GMT

To report wash sale transactions, you will need to check the "I need to adjust my total cost basis" box directly under the Total cost or other basis (sum of all Box 1e) box.

When inputting your Form 1099-B information do the following:

Click on Wages & Income
Select Add more income
Scroll down to Investments and Savings and click down arrow
Select Stock, Crypto...(1099-B...)
Select Add investments, Add a different way
Select Stock, Bonds, Mutual Funds (1099-B)
Enter brokerage information, then Continue
In the "Tell us about the sales..." section, answer those questions, then Continue
In the "Now choose how to enter your sales", Continue
Here, you will reach the box below the sales section, I need to adjust my total cost basis

Re: How do you report wash sale loss disallowed (1g) from your 1099-B?

ron — Tue, 03 Mar 2026 21:13:42 GMT

Thank-you for the detailed procedure to report a wash sale. That worked perfectly.

Re: How do you report wash sale loss disallowed (1g) from your 1099-B?

ghosh99 — Wed, 01 Apr 2026 22:40:17 GMT

No you should not adjust the cost basis . Usually brokers automatically adjust the cost basis to compensate for the wash sale. Import 1099-B or enter it manually exactly as reported esp if its coming from a major broker like Morgan Stanley/ J P Morgan/ E*trade/Fidelity etc