Getting married in Idaho? You’re gonna love this one, it’s actually way simpler than most states. But there are still a few rules that trip people up.
This guide breaks down everything you need to know. Age limits, license fees, who can officiate, and what counts as illegal. Stay with me here, it only takes a few minutes.
What Is Marriage Law in Idaho?
Marriage law is just the set of rules that say who can get married, how, and under what conditions. Idaho keeps things pretty simple compared to a lot of states.
Basically, the law covers three big things. Who is allowed to marry. How you get a license. And who can perform the ceremony. So simple, right?
Idaho also has a few unique rules about family relationships and age gaps. We’ll cover those too. Confused about why any of this matters? Because getting it wrong can mean your marriage isn’t legal at all.
Basic Marriage Age Laws
Who Can Marry Without Any Extra Steps
Anyone 18 or older can get a marriage license in Idaho. No parent needs to sign anything. No court needs to approve it.
You just need to show up, prove your age, and pay the fee. That’s it. Pretty straightforward.
Wondering if this applies to you? If you’re an adult and not currently married to someone else, you’re good to go.
What Happens If You’re 16 or 17
Here’s where it gets interesting. Idaho lets 16 and 17 year olds marry, but only with extra steps.
You need written consent from a parent or legal guardian. This isn’t a quick signature either. The consent has to be sworn to and acknowledged, meaning it’s formal and legally serious.
You also need to bring proof of age. That means your original birth certificate or a certified copy. The county recorder has to see it before issuing anything.
Honestly, this part surprises a lot of people. There’s also an age gap rule. A 16 or 17 year old cannot marry someone who is 18 or older if the age difference is three years or more.
So a 16 year old could marry an 18 year old. But not a 19 year old. That gap rule exists to prevent big age differences between a minor and an adult partner.
The Absolute Minimum Age
Wait, it gets stricter. Idaho used to allow marriage under 16 with a judge’s permission. That changed in 2020.
House Bill 466 set 16 as the hard floor. No exceptions. No judge can override it anymore, no matter the circumstances.
This matters because Idaho actually had one of the more relaxed child marriage laws in the country before that change. A 2019 bill to raise the age even higher failed. The following year, lawmakers tightened things up instead.
Getting Your Marriage License
The Basics
You’ll apply at any County Recorder’s office in Idaho. Both people need to show up in person. No exceptions here, not even for military members overseas in most cases.
The fee is $30. That’s actually cheaper than most states, where fees often run $60 to $80. Honestly, this is one area where Idaho makes things easier on couples.
There’s no waiting period either. You can get your license and marry the very same day. Some couples still wait a few days just to plan things out, but you don’t have to.
How Long Your License Lasts
Once issued, your license is valid for 12 months. The ceremony needs to happen and the license needs to get signed within that window.
Not sure what happens if it expires? You’d need to reapply and pay the fee again. So don’t let it sit in a drawer too long.
No Residency Required
This one surprises people. You don’t need to live in Idaho to get married there. Out-of-state couples can apply at any county, which is part of why Idaho is popular for destination weddings.
Bring valid photo ID. You’ll also need to provide Social Security numbers, your parents’ names, and your places of birth on the application.
Witnesses and Officiants
Idaho requires two witnesses for the ceremony. They need to be at least 18 and capable of signing the license. Most people just ask a close friend or family member.
Who can officiate? Judges, magistrates, and justices of the peace. Current and former governors and mayors too. Clergy members of any denomination also qualify, along with tribal officials and certain federal judges.
Family Relationship Rules
Who You Cannot Marry
Idaho bans marriage between close relatives. This includes parents and children, and any ancestor or descendant.
It also bans marriage between siblings, whether they share both parents or just one. Aunts and nephews, or uncles and nieces, are off the table too.
These marriages are called incestuous under Idaho law. That means they’re void from the very beginning, even if a ceremony happened.
The First Cousin Rule
Here’s where Idaho gets a little unusual. Honestly, this one catches people off guard. Idaho separately bans marriage between first cousins under its own specific law.
Think of it like a stricter cousin of the incest rule, but written as its own section. Most states that ban first cousin marriage just leave it at that.
Idaho actually has a narrow exception. First cousins can marry if the female is 55 or older. Or if either party is permanently unable to have children, proven with a physician’s affidavit.
It’s a rare situation. But it shows Idaho’s law was written with population and health concerns in mind, not just tradition.
Penalties and Consequences
Marrying Without Following the Rules
If a minor marries without proper consent, the marriage can be annulled. That means it gets treated as if it never legally happened.
Parents, guardians, or anyone who had legal custody of the minor can file for this. It’s a serious consequence, not just a formality.
Bigamy Is a Crime
Marrying someone while you’re still legally married to another person is bigamy. In Idaho, that’s a criminal offense, not just a paperwork problem.
Think of it like fraud, but against the marriage system itself. A second marriage entered into this way isn’t recognized, even if it happened legally somewhere else.
Incestuous and Prohibited Marriages
Marriages that break the family relationship rules are void automatically. You don’t need a court to cancel them. They were never valid in the first place.
Special Circumstances
Common Law Marriage
Idaho stopped recognizing common law marriage after January 1, 1996. That means simply living together and acting like a married couple no longer creates a legal marriage.
But here’s the twist. If a common law marriage was validly formed before that date, it’s still legally binding today. Idaho also recognizes common law marriages legally created in other states that still allow them.
Proving one exists takes real evidence. Joint tax returns, shared property, or testimony about how the couple presented themselves publicly.
Same-Sex Marriage
Same-sex marriage is fully legal in Idaho, thanks to the 2015 Supreme Court ruling in Obergefell v. Hodges. The requirements are identical to any other marriage. No extra steps, no different forms.
Tax and Filing Status Changes
Here’s a detail people don’t think about until it’s too late. Your marital status on December 31 decides your filing status for the entire year. Get married any day of that year, and you file as married for the whole thing.
This matters more than most couples realize, especially with a late-year wedding.
How to Apply for Your License
Ready to make it official? Here’s what you need to do.
First, both partners show up in person at a County Recorder’s office. Bring valid ID, your Social Security numbers, and details about your parents.
Second, pay the $30 fee. Cash, card, or check usually works, but call ahead to confirm your specific county’s policy.
Third, if either of you is 16 or 17, bring the signed parental consent form and original birth certificate.
Fourth, get married anytime within the next 12 months. There’s no waiting period, so you can even do it the same day.
Trust me, this process is way less complicated than people expect.
Frequently Asked Questions
What is the minimum age to get married in Idaho?
The absolute minimum is 16. Anyone 16 or 17 needs written parental consent and cannot have an age gap of three years or more with an adult partner.
Does Idaho require a waiting period for marriage licenses?
No. Idaho issues marriage licenses the same day, with no waiting period at all.
Can first cousins get married in Idaho?
Generally no. There’s a narrow exception if the female is 55 or older, or if either party provides proof of permanent sterility.
Do you need to be an Idaho resident to get married there?
No. Idaho has no residency requirement, which is part of why it’s popular for destination weddings.
Is common law marriage still legal in Idaho?
Not for new relationships. Idaho stopped recognizing new common law marriages after January 1, 1996, though ones formed before that date still count.
Final Thoughts
Idaho keeps marriage pretty simple for adults. Cheap license, no waiting period, no residency rule. Just show up, bring your ID, and you’re set.
Things get more complicated for minors, first cousins, and anyone with a past marriage still on the books. Those rules exist for real reasons, even when they feel surprising.
Now you know the basics. Stay informed, double check with your county recorder for local quirks, and when in doubt, ask a family law attorney.
References
- Idaho Code § 32-202, Persons Who May Marry — Idaho State Legislature
- Idaho Code § 32-205, Incestuous Marriages — Idaho State Legislature
- Idaho Code § 32-206, Marriages Between First Cousins — Idaho State Legislature
- Idaho Marriage Laws Overview — LegalClarity
- Idaho Child Marriage Laws: Age, Consent, and Requirements — LegalClarity
