It’s this close: Republicans in the House and Senate have struck a $1.5 trillion tax-cut deal that could put the economy on a fast track for years.

All they need is to put the final touches on the bill and pass it in both chambers. President Trump could sign it by Christmas.

That would be a major win — not just for Trump and the GOP, but for America.

GOP lawmakers managed to address some key gripes about the plan. To ease the hit in high-tax states from the cap on the state-and-local-tax (SALT) writeoff, they dropped the top rate from 39.6 percent to 37 percent.

They also left deductions for student-loan interest, grad-school tuition and medical costs untouched. And they massively bumped up the threshold for the alternative-minimum tax (which had limited the value of the SALT and other deductions).

Overall, the bill calls for big-time relief:

A chop to the corporate-tax rate, from 35 percent to 21 percent.

Breaks for small businesses.

Trims to rates for individual taxpayers.

A near doubling of the standard deduction for middle- and low-income taxpayers.

The idea is not just to let working folk keep more of their money but to encourage investment in America and keep companies from fleeing to lower-tax sites abroad.

The plan also repeals the ObamaCare mandate to buy health insurance — great news to young, healthy adults who are now overcharged and a savings of $338 billion off the tax bill’s price.

Nearly everyone, left and right, admits the reforms will produce at least some benefit to an economy that limped along for eight long years under President Barack Obama and is only now starting to grow at a decent pace.

No wonder the Federal Reserve just upped interest rates a quarter point. And why the markets keep setting records.

The bill’s passage isn’t guaranteed. On Thursday, Sen. Marco Rubio (R-Fla.) said he’d vote against it unless the child credit is boosted. And with Democrats all opposed, Republicans can’t afford to lose more than two of their 52 votes in the Senate.

This is no time for spoilers. Americans need this tax cut. Pass it, guys — now.