Albany Republicans, the minority in the state Senate and Assembly for the last seven years, face a long hike back to political relevance.

They can start by answering the $20 billion question.

That’s the difference between what New York state expects to spend this fiscal year — $148 billion, excluding federal aid and borrowing — and what it would be spending if the last budget enacted with GOP support, in 2018, had kept growing only at the rate of inflation.

That amount is $128 billion.

Republicans correctly note state spending is higher than ever — and, given Albany’s reliance on a small subset of high earners, rising unsustainably.

But they can’t put the blame on the Democrats alone.

The $20 billion question isn’t about what Republicans would cut if voters again entrusted them to steer the state.

It’s a deeper challenge: It asks them to explain, to themselves especially, how they can credibly claim to be the taxpayers’ champions when they not only supported much of this fiscal bulge, but pushed to make it worse.

Most of the budget growth since 2018 has been in just two programs: Medicaid and school aid.

Republicans supposedly concerned about the state’s fiscal picture have repeatedly agitated for higher spending........

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