Around 3 AM, it occurred to me that I don't know the answer to this question, and I'll need to know it eventually: We put a solar electric (PV) system on our home in 2001. Say it cost around $33k. This is in California, and the CA Energy Commission reimbursed us around $14k. And then we got another $3k CA income tax credit. So my question is this: By how much did our cost basis go up? $16k? (both CEC rebate and tax credit count) $19k? (tax credit doesn't count) $30k? (CEC rebate doesn't count) $33k? (neither rebate nor credit count)
I've been assuming that the number is $16k, since that's what I'm out-of-pocket. Any other opinions?