No rush for me: I can't take advantage of the tax credit. Of course, the corollary is that I can't afford a Tesla either
I don't know what the split in the US is for those who can take advantage of the tax credit, but there is a common misconception around EV discussions that everyone has a large tax burden that will be offset by the credit. Not everyone makes that much money.
Some good comments have been posted about Roth Conversions, but there are a few things worth pointing out:
1. Don't confuse a contribution to a Roth with a "Roth Conversion". While there are limits to how much you can contribute to a Roth in a given year, there are no limits to how much you can convert (move from a traditional IRA or 401k to Roth).
2. A Roth conversion is treated as regular income and taxed as such, but unlike an early distribution from an IRA you do not have to pay the 10% early distribution penalty that you normally would for a pre- age 59 1/2 IRA distribution.
Of course you can get all this info from the interwebs. This page is pretty good:
The Ultimate Roth IRA Conversion Guide - Everything You Need to Know
So, if your tax liability is looking to be low for 2018 and you want to take advantage of the full $7,500 tax credit, a Roth conversion is a great way to do so. And with the stock price so low right now, converting TSLA shares held in an IRA or 401k to Roth right now is even more attractive. I've converted over $30,000 worth of Tesla stock this year to my IRA, and it will largely be offset by the tax credit on my (soon to be) M3 purchase. Hell, whenever we're in a dip and I'm "out of dry powder" I always consider converting a few shares to my Roth, since better to pay taxes on shares at $2xx/share instead of $7xx, $8xx or $9xx/share, no? You just have to be aware of how it's going to affect your tax bill for the year.
One last thing: If you are buying your health insurance from a state or the federal exchange and receiving a subsidy (i.e Obamacare), then be aware that a Roth conversion is going to bump your regular income and if your income exceeds the income estimate you used to get your subsidy, then will have to repay some or all of your health care subsidy.
Not an advice.
PS: At Fidelity the share value used to calculate the value of a Roth conversion is the end-of-day price, not the price at the time of the transfer. At Schwab I believe it was handled differently (but it's been a few years since I've used Schwab).