Adopting an adult typically costs between $100 and $800 if you handle the paperwork yourself, and roughly $800 to $2,500 when you hire an attorney for a straightforward, uncontested case. Where you live drives most of the swing, because court filing fees vary widely by jurisdiction, and a contested case can push the total well above those ranges. The real cost of how much it costs to adopt an adult also extends past the courthouse into updated records, estate planning, and tax and benefit changes that follow the decree.
Court Filing Fees
The filing fee for the adoption petition is the first hard cost. Some courts charge as little as $20; others run above $400. Most land somewhere in the $100 to $350 range. The fee is non-refundable and covers docketing the case, scheduling the hearing, and issuing the final decree.
Certified copies of the adoption order are usually billed separately, typically $5 to $25 each. Plan on at least two or three, because you’ll need them to update other records afterward.
Some courts also require formal notice to certain parties. If you hire a professional process server, expect roughly $20 to $100 per service depending on location and complexity.
Attorney Fees
Adult adoption is one of the simpler family-law proceedings, and plenty of people file without a lawyer. When you do hire one, fees for a straightforward, uncontested case commonly run $500 to $2,500. Attorneys typically charge either a flat fee or bill hourly at around $200 to $350. The total depends on how much document preparation is involved, whether the attorney appears at the hearing with you, and local market rates.
Complications push the number higher. A contested adoption, unusual interstate issues, or an adoptee with a disability that requires additional court findings can all add hours.
Filing Pro Se
If the adoption is truly uncontested and your court’s forms are self-explanatory, filing on your own is realistic. Many courts publish fill-in-the-blank petition forms specifically for adult adoption, and the hearing itself is often brief. Most states also skip the home study requirement for adult adoptions, which eliminates what would otherwise be a significant cost.
Even so, if the adoption could affect property rights, business interests, or ongoing support obligations, an hour of legal advice before filing can prevent expensive problems later.
Fee Waivers If You Can’t Afford the Filing Fee
Most courts offer a fee waiver process for people who can show financial hardship. Eligibility usually falls into one of three categories: you receive means-tested public benefits such as Medicaid, SNAP, or SSI; your household income falls below a court-set threshold; or you can demonstrate that paying the fee would prevent you from meeting basic living expenses.
You typically complete a standardized court form, attach supporting documents like pay stubs or benefit verification letters, and submit it alongside the adoption petition. Judges can grant a full or partial waiver at their discretion.
Costs After the Decree
Once the court issues the adoption decree, follow-up expenses come into play. The adoptee is entitled to a new or amended birth certificate reflecting the adoptive parent’s name. Fees vary by the state that issued the original certificate but generally run $15 to $65, sometimes structured as a small filing fee plus a per-copy charge.
If the adoptee changes their surname through the adoption, other identification documents need updating. A Social Security card replacement is free. A driver’s license update carries a fee set by your state’s motor vehicle agency.
Updating a passport after a legal name change means submitting a new application or a correction form to the U.S. Department of State. Fees depend on whether you’re renewing an existing passport book or applying fresh. Expedited processing adds $60 to the application fee, and optional priority delivery costs about $22.
Confirm Your State Allows It Before You Spend Anything
A majority of states allow any consenting adult to be adopted by another consenting adult without restrictions. A handful of states limit adult adoption to specific relationships: stepchildren, nieces, nephews, grandchildren, former foster children, or adults with disabilities. A few states also restrict adult adoption when the parties are close in age, or when a court suspects the adoption is being used primarily to sidestep inheritance rules or immigration law rather than to formalize a genuine family bond.
Consent is the backbone of every adult adoption. The adoptee must agree, and if the adopting parent is married, their spouse typically must consent as well. Some states also require the adoptee’s spouse to consent. No agency investigation, parental rights termination, or birth-parent consent is required, because the adoptee is a legal adult making their own decision.
The Costs That Don’t Show Up on an Invoice
Inheritance Rights
In most states, a finalized adoption severs the legal relationship between the adoptee and their biological parents. The adoptee gains full inheritance rights from the adoptive parent but simultaneously loses the right to inherit from biological parents under intestate succession, the default rules that apply when someone dies without a will. If a biological parent wants the adoptee to inherit despite the adoption, they need to name the adoptee explicitly in a will or trust.
Roughly a third of states carve out an exception for stepparent adoptions, letting the adoptee keep inheritance rights from the deceased biological parent whose spouse adopted them. Outside that scenario, the legal cutoff is clean. A biological parent’s existing will may need updating, and the adoptive parent should consider drafting or revising estate documents to reflect the new legal relationship. Budget for an estate planning consultation on both sides if either family has assets worth protecting.
Taxes
The federal adoption tax credit does not apply to most adult adoptions. The IRS limits the credit to adoptions of a child who is either under 18 or physically or mentally unable to care for themselves.1Internal Revenue Service. Adoption Credit If you’re adopting a healthy adult, you cannot claim the credit regardless of how much the adoption costs.
You may be able to claim the adult adoptee as a dependent under the “qualifying relative” rules. The IRS treats an adopted child the same as a biological child for the relationship test, so that hurdle is automatically cleared. The remaining requirements are tougher: the adoptee’s gross income must be below $5,050, you must provide more than half of their total support for the year, and they cannot file a joint return with a spouse (except solely to claim a refund).2Internal Revenue Service. Dependents In practice, claiming a working adult adoptee as a dependent is rarely possible. It’s more realistic when the adoptee has a disability and limited income.
Health Insurance
One of the more immediate financial benefits is health insurance access. Under the Affordable Care Act, any plan that offers dependent coverage must extend it to an enrollee’s child until the child turns 26, regardless of whether the child lives with the parent, is a tax dependent, or is a student.3CMS. Young Adults and The Affordable Care Act: Protecting Young Adults and Eliminating Burdens on Families and Businesses Because an adopted child is legally the parent’s child, an adoptee under 26 can be added to the adoptive parent’s employer-sponsored or marketplace plan. For a 19-year-old without insurance, that benefit alone can outweigh the entire cost of the adoption. The eligibility ends at 26.
Social Security
An adult adoptee can qualify for benefits on the adoptive parent’s earnings record, but the Social Security Administration applies specific dependency rules. If the adoption happens after the parent is already receiving retirement or disability benefits, the adoptee must have been living with or receiving at least half of their support from the parent during the year before the adoption was finalized.4Social Security Administration. 404.362 When a Legally Adopted Child Is Dependent If the adoption happens before the parent begins collecting benefits, dependency is presumed.
FMLA and Immigration Are Usually Dead Ends
The Family and Medical Leave Act provides up to 12 weeks of job-protected leave for the placement of a child for adoption, but FMLA defines “child” as someone under 18 or an adult incapable of self-care due to a disability.5U.S. Department of Labor. Family and Medical Leave Act Adopting a healthy adult does not trigger FMLA leave.
Immigration benefits are also largely off the table. Under the Immigration and Nationality Act, an adopted person qualifies as a “child” for immigration purposes only if the adoption was finalized before the person’s 16th birthday and the adoptive parent had legal custody and lived with the child for at least two years.6Office of the Law Revision Counsel. 8 USC 1101 Definitions A narrow sibling exception extends the cutoff to 18, but only when the adoptee’s sibling was already adopted by the same parent before turning 16. Adopting someone already over 18 does not create the legal parent-child relationship immigration law requires for a family-based visa petition.
Adult adoptees already in the United States may have separate paths to citizenship or permanent residency unrelated to the adoption itself. The U.S. Citizenship and Immigration Services notes that foreign-born adult adoptees who are not already citizens may be eligible to apply for naturalization or lawful permanent resident status through other immigrant categories.7U.S. Citizenship and Immigration Services. Adult Adoptees and U.S. Citizenship The adoption itself won’t get them there. Anyone pursuing adult adoption primarily for immigration reasons should talk to an immigration attorney before paying a filing fee.