It depends. How do YOU define tax liability?
If you are over 59 1/2, then all you pay is income tax on your pension withdrawal, and yes, the $7,500 Section 30D credit can be used to reduce your income taxes on that withdrawal. But common sense tells me to roll that distribution into a Roth IRA. Same tax hit, but the funds appreciate tax-free and withdrawals are tax free.
However, if you are younger than 59 1/2, then you not only have income taxes to pay on the distribution (which, yes, the 30D credit can be used to reduce the income taxes), but you will also have a 10% excise tax penalty figured on form 5329 and reported on line 59. Line 59 is part of the "other taxes" segment of form 1040, and these are not Chapter 1 (income) taxes. The $7,500 30D tax credit cannot be used to offset this additional tax. So, a hypothetical $40,000 early distribution from a qualified plan will result in federal and state income taxes on $40,000 plus a $4,000 additional federal tax. Here in California, the state has its 2 1/2% additional tax.