"By the way, TurboTax actually computes $5334 for me and $2166 for my spouse. I guess a dollar here and there is due to rounding errors."
This is probably the case. When you multiply $7,000 by 8/12ths, you get $4,666.67. When you multiply $1,000 by 8/12ths, you get $666.67. If you do the rounding now, you add $4,667 to $667, and you get your $5,334.
TurboTax tends to round early in most processes, so this is the likely explanation.
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