These maps show why some California Republicans are nervous about changes to the tax code

California taxpayers would be hit disproportionately hard under the Republican tax plan because of changes to two popular tax breaks.

That's one reason GOP lawmakers in the state's House delegation were under so much scrutiny when most of them voted to pass the House version in November. Several members said they agreed to move the bill forward with the promise of a fix later.

The House proposal would eliminate much of the state and local tax deduction, known as SALT, and set a limit of $500,000 on the mortgage debt that can be used to claim the mortgage interest deduction. The current Senate proposal eliminates the SALT deduction entirely, but keeps the mortgage interest deduction at $1 million.

As Senate and House leaders negotiate a final package, House leaders are considering keeping a version of the deductions in order to get the state’s Republican members on board for a final vote.

We took a look at the 14 California congressional districts represented by Republicans and calculated the share of residents who take the SALT deduction and the percentage of new mortgages over $500,000 in 2017. Many of them match up with the districts Democrats hope to win in their bid to retake control of the House, according to a Times analysis of data provided by CoreLogic and the IRS.

Democrats intend to use the tax vote against Republicans who represent districts that will be battlegrounds in the midterm elections next fall.

Times staff writer Sarah D. Wire contributed to this report.

Mimi Walters

Republican - 45th District

Voted YES on House bill: “We’re running numbers right now just to make sure we can have enough of a fix where we know that everybody is going to have a tax deduction. Not sure what that number looks like right now.” Los Angeles Times

47%
48%

Tom McClintock

Republican - 4th District

Voted NO on House bill: “I made a pledge not to raise taxes. This bill raises taxes on a significant number of my constituents and Californians disproportionate to the population.” Los Angeles Times

45%
8%

Dana Rohrabacher

Republican - 48th District

Voted NO on House bill: “This was not an easy vote to figure out, it was not an easy vote to determine, but when my constituents who are very good with their numbers tell me that they are going to be [paying] $5,000 to $10,000 more in taxes, I’m supposed to represent their interests.” Los Angeles Times

42%
52%

Darrell Issa

Republican - 49th District

Voted NO on House bill: “There's a lot of ways they could try to make it uniformly fair to the states, and I see no chance of it ... This is a pretty good bill from a business standpoint and a poorly thoughtout bill on the non-business side.” Los Angeles Times

42%
44%

Ken Calvert

Republican - 42nd District

Voted YES on House bill: “I think it’s moving in the right direction and I’m sure looking forward to supporting the final package when it comes to the floor.” Los Angeles Times

42%
5%

Steve Knight

Republican - 25th District

Voted YES on House bill: “There’s got to be something that California is going to have to get. We moved the vote forward, we moved it [out of] the House .... There are some things in the Senate bill that I absolutely don’t like and when it conferences together, if it doesn’t get there, it doesn’t get there for me.” Los Angeles Times

42%
17%

Ed Royce

Republican - 39th District

Voted YES on House bill: “While this bill is not perfect, it’s a good first step. I’m committed to ensuring that the final product works for all Californians, especially for those who need it most.” Press release

40%
31%

Duncan Hunter

Republican - 50th District

Voted YES on House bill: “I am excited about this plan. It is a once-in-a-generation opportunity to work towards a better future for every American. A straightforward approach that will deliver more jobs, implement fairer taxes and result in bigger paychecks.” Press release

37%
20%

Kevin McCarthy

Republican - 23rd District

Voted YES on House bill: “I believe at the end of the day, when you look at the entire tax package ... people will see there's a savings. I think Californians win in this.” Los Angeles Times

34%
1%

Jeff Denham

Republican - 10th District

Voted YES on House bill: “This is supposed to be a middle class tax cut ... Ultimately, right now this is a good thing for the folks that are looking for a tax cut in my district.” Interview with the Times

31%
2%

Doug LaMalfa

Republican - 1st District

Voted YES on House bill: “Under the Tax Cuts and Jobs Act, the vast majority of North State residents will save money, period.” Press release

31%
2%

Devin Nunes

Republican - 22nd District

Voted YES on House bill: “For the first time in 31 years we are wiping the tax code clean and replacing it with one that is fairer and simpler for everyone.” New York Times

30%
2%

Paul Cook

Republican - 8th District

Voted YES on House bill: “I have to say my prayers and get divine guidance. And if I’m right, I’m going to vote the right way and go to a racetrack right afterward.” Los Angeles Times

29%
2%

David Valadao

Republican - 21st District

Voted YES on House bill: “My district is very different, obviously, than the rest of California .... Overall for my constituents, this is actually a really good piece of legislation.” Los Angeles Times

18%
1%

Sources: Times reporting, media reports, CoreLogic, Internal Revenue Service, U.S. Census Bureau, OpenStreetMap