The Senate is poised to vote on Thursday on two separate plans aimed at addressing a spike in health care costs that are expected for tens of millions of Americans who receive enhanced Affordable Care Act tax credits unless Congress acts.

Both plans, one put forward by Democrats and the other championed by Republicans, are almost certain to fail.

After they do, lawmakers will have only a matter of days remaining to address the expiration of the enhanced tax credits, and there's little indication that any sort of breakthrough is on the horizon.

Democratic plan: 3-year extension of expiring enhanced tax credits

The Democratic plan that will receive a vote on Thursday proposes a three-year extension of the enhanced Affordable Care Act subsidies that are otherwise set to expire on Jan. 1.

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