A few things to consider
Be prepared to be hands-on
This method requires more effort: Generally, you must specify before the settlement date the shares to be sold or transferred and Vanguard must confirm those specifications back to you within a reasonable time.
We try to make this easier by giving you quick online access to the potential gain or loss for each share or lot.
Log in to see your cost basis summary
More recordkeeping may be required
For noncovered mutual fund shares, we'll continue using average cost to track the cost basis. If you're eligible to use specific identification for noncovered shares, you'll need to use your records to specify the shares to be sold as we only have the average cost basis available.
For other noncovered shares, we'll report the shares you specify and can confirm the shares you specify back to you in a letter.
We won't report cost basis for noncovered shares to the IRS.
Get details on covered & noncovered shares
You remain responsible for reporting your cost basis information to the IRS every year on Form 1040, Schedule D, for all shares sold, whether they're covered or noncovered. You should use your own records in addition to the cost basis information we provide.
In addition, for covered shares, the information you report in column (e) on Form 8949 must match what we send to the IRS on Form 1099-B.