The $8,750 that TurboTax indicates includes only the $1,000 catch up for the particular individual for which TurboTax is calculating the contribution limit. The other spouse needs to make their $1,000 catch-up contribution to their own HSA account. The $7,750 regular family contribution can be divided between the spouses in any way you see fit, but the each spouse must make their own $1,000 catch-up contribution. If you contribute the full $7,750 family limit to your HSA plus your $1,000 catch-up, your spouse can contribute only the $1,000 catch-up to your spouse's HSA.
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