Spouses share a lot, but no matter your relationship status, your credit score belongs to you and you alone. Even if you're 100% supported financially by your spouse or partner, establishing and building your own credit score is essential.
It can benefit you both as you navigate financial decisions together. But should you divorce or your spouse pass away, having good or excellent credit can help you as you begin to make financial decisions on your own.
Besides, maintaining some money independence can keep you both on equal footing in your relationship.
"A household's financial dependence on one income earner can foster unhealthy relationship control dynamics," said Katherine Fox, a certified financial planner, founder and advisor at Sunnybranch Wealth in Portland, Oregon, in an email. "Stay-at-home spouses who take steps to protect their credit score and financial literacy are doing their part to maintain a healthy money attitude and dynamic within their relationship."
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WHY YOUR CREDIT SCORE IS EQUALLY IMPORTANT
Any time you and your spouse apply for a joint loan, like a mortgage, both of your credit scores get evaluated by the lender. Lenders may use the person's score that falls on the lower end to determine your eligibility. Ideally, even the lowest score between you both is still in good shape because this can affect what loan terms, like interest rates, you'd qualify for together. A lower credit score can make borrowing money more expensive.
Your credit score also comes into play when you apply for a credit card in your own name, which you can do even if you don't earn an income. So long as you're 21 or older, you can include your spouse's income on the card application.
Moreover, unexpectedly becoming single again is the most difficult reason nonworking spouses need to build their credit.
"Having a solid foundation will help you if you end up alone and need capital to get started," says Brittany Davis, a Memphis, Tennessee-based accredited financial counselor who is an associate financial planner for Brunch & Budget, a registered investment advisor. "I know some people are leery of credit and debt, but there are so many things credit can be used for."
Davis likens credit access to insurance — it's something that's good to have, whether or not you need it at the moment.

FILE - In this June 15, 2018, file photo, cash is fanned out from a wallet in North Andover, Mass. You share a lot with your spouse, but your credit score isn’t one of those things. Even if you don’t earn an income and your spouse supports you financially, it’s important to build your own credit score. Not only will your score come into play when you apply for a joint loan, but you may need to fall back on it if you ever become single again. You can build credit by using your spouse’s income on a credit card application, or by becoming an authorized user on one of their cards, and making on-time payments each month. (AP Photo/Elise Amendola, File)
WAYS TO BUILD CREDIT WITHOUT AN INCOME
Besides applying for your own credit card using your spouse's income in your application, there are other ways to build your credit.
You can become an authorized user on your spouse's credit card. They'd be responsible for making payments, but if they pay on time each month and you both avoid charging more than 30% of the credit limit, over time this can build your credit score. Applying for loans under both of your names, like an auto loan or mortgage, can also be helpful as on-time payments will be reflected on both of your credit reports.
"At the very least, stay-at-home spouses should be a joint account holder or added to their partner's credit card to help them build and maintain their own credit score," Fox says.
Be sure to also pay other household bills on time, including utility bills and rent payments. In some cases, those are also reported to credit bureaus.
HOW YOU CAN AFFECT EACH OTHER'S CREDIT SCORES
Though you each have your own credit scores, your money habits can help or hurt each other, particularly when you have joint loans or share credit cards.
As a credit card authorized user, you're at the mercy of the primary cardholder's behaviors. If your spouse makes late payments, that can negatively impact your credit. You'll want to set a budget with each other, because when more than one person uses the same card, it's that much easier to overspend. Becoming an authorized user is an exercise in trust and communication.
Where you live can also be a factor in how you can each affect each other. According to Fox, in community property states, you're generally not responsible for any debts your spouse took on before you got married, but you're responsible for each other's debts after marriage. But in non-community property states, you only share responsibility for joint accounts and debts.
And if you're the income earner, proceed with caution before co-signing a loan for your nonworking spouse or any other loved one. It's not like a joint loan, where both parties share the burden of debt payments but can also share ownership of an asset.
"Co-signing is more of a risk in my eyes because you have no secured interest in that item you're co-signing a loan for," Davis says. "If that person fails to make payments, you become responsible for the loan, but you don't have an interest as an owner."
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How credit scores of new auto loan recipients have changed over the past 10 years
How credit scores of new auto loan recipients have changed over the past 10 years

Someone wants to lend you money. If they don’t know you, how do they know that you can be trusted to pay them back in full? Professional lenders turn to credit scores to get insight on your reliability and calculate how likely you are to pay a loan back on time. These cores are a way to measure the risk associated with a lender loaning you money.
A FICO Score, one of the types of credit scores, is calculated by looking at your individual profile of amount of money owed, payment history, credit history length, new credit, and mix of credit accounts, which is the combination of loans you have such as mortgages, student loans, and credit cards.
When purchasing a car and receiving an auto loan, it is important to have a good credit score in order to get the most competitive interest rates from lenders. The exact rate will depend on many factors, including how much money you’re borrowing, the terms of the loan, and your lender. However, the scale here is clear: The lower your credit score, the more challenging it is to receive a loan with a low-interest rate.
For those who do fit into the fair-to-low credit score category (699 or lower) or have a limited credit history, a subprime auto loan is often the best or even only option. “Subprime” simply means a borrower with a below-average credit classification. Subprime auto loans became a huge business during 2001-2004 as banks and other lenders became flush with cash and were willing to open loan options for those previously considered to be less-than desirable borrowers. There isn’t, strictly speaking, an official subprime auto loan rate, but it is generally 3-5 times higher than the prime loan rate. During the Great Recession of 2008, when there was an increase in consumer debt and default, especially on mortgage debt, subprime loans in the housing market both contributed to and continued to exacerbate the financial turmoil. One fallout of the recession was an increase in subprime lending for auto loans.
RateGenius delved into data from the New York Federal Reserve’s Quarterly Report on Household Debt and Credit to look at how credit scores among auto loan recipients have changed over the past 10 years. For this list, only credit scores from the fourth quarter of each year are included. According to the New York Fed, over $733 billion in auto loans originated in 2021. Following a plunge in median credit scores in the wake of the Great Recession, scores have primarily recovered to the late 2000s-ranges.
Since 2012, the credit scores of those who received auto loans are up about 2%, and during the first quarter of 2021, the median credit score of auto loan recipients reached 720, marking a record high since the NY Fed began to chart the credit scores of auto loan recipients in 1999. Of further note, the bottom 10th percentile, after several years trending downward, has begun to rise, suggesting that in general, albeit slowly, lending is favoring those borrowers with higher credit scores.
2012

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 697 (0.0% change since 2012)
--- bottom 25th: 626 (0.0% change)
--- 10th: 567 (0.0% change)
2013

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 691 (-0.9% since 2012)
--- bottom 25th: 621 (-0.8%)
--- 10th: 562 (-0.9%)
2014

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 695 (-0.3% since 2012)
--- bottom 25th: 627 (+0.2%)
--- 10th: 568 (+0.2%)
2015

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 696 (-0.1% since 2012)
--- bottom 25th: 626 (0.0% change)
--- 10th: 564 (-0.5%)
2016

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 700 (+0.4% since 2012)
--- bottom 25th: 629 (+0.5%)
--- 10th: 565 (-0.4%)
2017

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 707 (+1.4% since 2012)
--- bottom 25th: 636 (+1.6%)
--- 10th: 575 (+1.4%)
2018

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 710 (+1.9% since 2012)
--- bottom 25th: 639 (+2.1%)
--- 10th: 572 (+0.9%)
2019

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 715 (+2.6% since 2012)
--- bottom 25th: 641 (+2.4%)
--- 10th: 572 (+0.9%)
2020

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 717 (+2.9% since 2012)
--- bottom 25th: 643 (+2.7%)
--- 10th: 583 (+2.8%)
2021

- Breakdown of credit scores for auto loan recipients:
--- median, 50th percentile: 709 (+1.7% since 2012)
--- bottom 25th: 642 (+2.6%)
--- 10th: 582 (+2.6%)
This story originally appeared on RateGenius and was produced and distributed in partnership with Stacker Studio.
This column was provided to The Associated Press by the personal finance website NerdWallet. Sara Rathner is a writer at NerdWallet. Email: srathner@nerdwallet.com. Twitter: @SaraKRathner.