I have a similar issue that may result in an extension. My daughter's W-2 does correctly deduct the HSA amount listed in block 12 for Code W from blocks 1, 3 and 5 of the W-2. However, the amount in 12 is shown as $300, but the total amount the employer deducted from her pay and deposited to her HSA trust account was $1,050. Shouldn't this entire amount of $1,050 be shown in block 12? Discussions with the employer state the amount listed in block 12 of $300 is supposed to be a percentage of the total $1,050. However, I don't see this in IRS Publication 969.
