South Dakota prenuptial agreements, online for $649
A prenup built for South Dakota law and for your finances, completed online by you and your partner in days. One flat price for the couple, with notarization included. No retainers, no hourly bills, no per-partner pricing.
Not sure it fits your situation? Book a free 20-minute consult
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Why a South Dakota prenup is different
A First prenup is built around the laws of South Dakota, and you, from the ground up.
South Dakota adopted the UPAA, and asks little on paper
South Dakota's premarital agreement statute asks for a written agreement signed by both parties, enforceable without consideration. No notary, no witnesses. You can contract about property, about what happens on separation or death, and about spousal support. What matters afterwards is how the agreement was made.
The test is voluntariness and disclosure
A South Dakota court will not enforce a prenup if the partner challenging it proves they did not sign voluntarily. Nor will it enforce one that was unconscionable when signed, where that partner got no fair and reasonable disclosure of the other's property and obligations, waived none in writing, and had no adequate knowledge of them otherwise.
An equitable division of everything either of you owns
Without a prenup, a South Dakota court may make an equitable division of the property belonging to either or both of you, whichever name is on the title, with regard for equity and the circumstances of the parties. That includes what you brought to the marriage. A prenup is how you two decide instead.
What your $649 South Dakota prenup includes
One price per couple, not per partner. Everything below is included.
- Customized to South Dakota law and to your finances, not a fill-in-the-blank template
- Built on a foundation drafted with experienced family law attorneys
- Guided questionnaire both partners complete separately, from any device
- Structured financial disclosure tools for both partners, which is what South Dakota courts examine
- Covers real estate, retirement, business ownership, equity, inheritance, gifts, debts, pet custody, and more
- Online notarization included at no extra cost
- Save and resume anytime, so both partners have time to review before signing
- $649 flat. No retainer, no hourly bills, no per-partner pricing. Finish at your own pace.
Customized to South Dakota law and to your finances, not a fill-in-the-blank template First vs hiring two South Dakota attorneys on your own
Key considerations
A South Dakota prenup is $649 flat for the couple through First, completed online with notarization included. Hiring two attorneys separately in South Dakota, where family law attorneys average $276 an hour and Sioux Falls area rates run $200 to $325 an hour, commonly lands between $2,100 and $8,100 for the couple.
Hired separately, a prenup is quoted per partner and often billed hourly, so the final number is hard to predict before you start. First is one flat price for both of you, with no retainer and no hourly bills.
The fees also price only the legal work. Hiring on your own means building a shortlist of South Dakota family law attorneys, calling each one, booking consults, and confirming both fees and availability against your wedding date, then running all of it again because your partner needs a different attorney. First replaces this work with a process the two of you complete together, at your own pace, from anywhere in the state.
| Hourly rate | Typical total for the couple | |
|---|---|---|
| South Dakota average, all practice areas | $252 | – |
| South Dakota family law attorneys | $276 | – |
| Sioux Falls area | $200 to $325 | – |
| Two Sioux Falls-area attorneys hired separately | – | $2,100 to $8,100 |
| First Self-Serve | Flat fee | $649 for the couple |
Rates from the Clio 2025 Legal Trends Report and published Sioux Falls-area family law rates. Couple totals are computed from those rates. Reviewed for South Dakota in September 2026.
How it works
From start to signed on your schedule, with time to review
1
Sign up and invite your partner
Create your account, add your partner's email, and you are both in the platform.
2
Complete the guided questionnaire
Walk through assets, debts, real estate, and retirement at your own pace. Save and resume anytime.
3
Review your custom agreement
Your prenup is generated from your answers and built for South Dakota, not pulled from a generic template.
4
Sign and notarize online
Once both partners are aligned, sign and notarize on the platform, well before the wedding.
Real couples, real successes with First®
The #1 customer-rated prenup platform.
Verified customer
My attorney, Lauren, was excellent! I strongly recommend First and am glad I went through the process!
Verified customer
We were so grateful to have found First. [The process facilitated] meaningful discussions about our marriage, just in time for the wedding itself. The process was easy (as easy as legalese can be!), quick, and affordable.
Verified customer
We trusted our lawyers completely. I specifically found that my lawyer, Lauren, was great with details. It really felt like I was working with someone one-on-one on my prenup.
Verified customer
My first (and last) prenup was a breeze with First. The platform itself was virtually flawless and we were impressed with our lawyers. My lawyer, Lars, was a superstar!
Verified customer
First has exceeded my expectations. It made what could be a stressful complicated process incredibly simple, easy, and affordable. I cannot rave about the experience enough.
Verified customer
First was a no-brainer for us. The entire experience was stress-free and straightforward. I'd recommend it to anybody getting a prenup.
Verified customer
The entire process was smooth and I was impressed with the prenup itself. Our lawyers pointed out things we may have otherwise missed.
Verified customer
First is incredibly streamlined and the attorneys were super thorough. The whole process was actually fun!
Verified customer
First is super sleek. The platform is modern, made it easy for me to digest the questions, and got straight to the point.
Verified customer
The process of generating our prenup [with First] was extremely simple. The lawyers answered all our questions and helped us ensure we had an agreement that worked for both of us.
Verified customer
First made navigating our prenup simple and stress-free, which meant one less thing to worry about as our big day approached.
Verified customer
Who knew that making a prenup could be such a delightful experience! First's platform made working on a prenup with my partner super easy. The whole experience seemed really well organized – and I have full confidence in the result.
These testimonials are real customer quotes collected by First. No compensation was provided in exchange for these quotes.
Is Self-Serve right for your South Dakota prenup?
First Self-Serve is the best option for your prenup. It combines a process that guides you through alignment and full financial disclosure with a reasonable cost and free online notarization.
Self-Serve is right for you if…
- You and your partner broadly agree on how you want your finances to work
- You want a South Dakota-specific agreement rather than a downloadable template
- You have time before the wedding for both of you to read it, ask questions and sign well ahead of the day
- You want one flat price for the couple instead of two hourly bills
Self-Serve covers situations like…
- One of you owns a business, or holds stock, options or RSUs
- A home or other property one of you owned before the wedding
- An inheritance or family gifts you want to keep as separate property
- Child support or support one of you already pays from a prior marriage
- Deciding support now, whether that means waiving it or setting it in advance
South Dakota prenup questions, answered
Is a prenup enforceable in South Dakota?
Yes. South Dakota asks that you signed voluntarily and that the agreement was not unconscionable when signed without fair and reasonable disclosure, a written waiver and adequate knowledge. An agreement built on full disclosure and signed with time to spare is built to pass that test.
How much does a prenup cost in South Dakota?
With First, a South Dakota prenup is $649 flat for the couple, with online notarization included. Hiring attorneys instead commonly runs $2,100 to $8,100 for the couple, billed hourly at Sioux Falls area rates of $200 to $325 an hour, since each partner needs their own attorney and the hourly math runs twice. Our guide to what a prenup costs walks through that math.
Do you do prenups in Sioux Falls, Rapid City and Brookings?
Yes. First serves couples across South Dakota, including Sioux Falls, Rapid City and Brookings. Self-Serve is $649 flat for the couple and is completed online, so where in the state you live does not change the process or the price.
How much does a prenup cost in Sioux Falls?
Sioux Falls-area family law attorneys commonly bill $200 to $325 an hour. Because each partner needs their own, hiring two separately commonly runs $2,100 to $8,100 for the couple. First is $649 flat for the couple, with online notarization included.
Do both people need a lawyer for a prenup in South Dakota?
No. South Dakota does not require either partner to be represented for a prenup to be valid. What a court looks at is whether both of you signed freely and knew what the other had. Disclosure and timing are within your control, and they are what First Self-Serve is built around. If you'd like to talk your situation through, book a free 20-minute call.
Can I do a South Dakota prenup online?
Yes. Nothing in South Dakota law treats an agreement differently because of how it was produced. What matters is that it is in writing and signed, that both partners disclosed their finances fully, and that both signed freely. First Self-Serve is $649 for the couple and includes online notarization.
Does a South Dakota prenup have to be notarized?
No. South Dakota does not require a prenup to be notarized for it to be valid. Notarizing it is still worth doing, because a notarized signature is straightforward evidence that both partners signed. First includes online notarization at no extra cost.
When should we sign a prenup in South Dakota?
As early as you reasonably can. South Dakota sets no waiting period, but how much time each partner had to read and think about the agreement is what a court looks at first if it is ever challenged. An agreement produced days before the ceremony is the fact pattern most likely to fail. Signing months ahead removes the argument.
Is First Self-Serve right for a complex South Dakota prenup?
Yes. Self-Serve covers business ownership, stock, options and RSUs, real estate, inheritance and gifts, existing child support or support obligations, and support terms, all for $649 flat for the couple. If you'd like to talk your situation through first, book a free 20-minute call.
What does a South Dakota prenup cover?
A South Dakota prenup decides what stays separate, in place of an equitable division a court can make of property belonging to either or both of you. It also covers debts, and what happens to property each of you brings in. A South Dakota court can still decline to enforce terms that are unconscionable, which is why disclosure matters as much as the terms themselves.
Start your South Dakota prenup
A South Dakota-specific prenup, built online and made to hold up. $649 flat for the couple, with notarization included.
Not sure it fits your situation? Book a free 20-minute consult