Turning 18 feels like a cliff edge for a lot of families, but it does not have to be. The law requires a transition plan years in advance, gives you notice before rights shift, and gives your family more options than "guardianship or nothing." Here is the actual sequence.
When transition planning has to start
Federal law (34 CFR 300.320(b)) requires the IEP to include measurable postsecondary goals, covering training, education, employment, and independent living where appropriate, beginning no later than the first IEP in effect when your child turns 16. Many IEP teams start earlier, at 14 or 15, especially if the student's goals are still forming. The plan must also list the specific transition services and courses of study needed to reach those goals, and it gets revisited every year.
What changes at 18: the transfer of rights
Under federal law (34 CFR 300.520), when a student reaches the age of majority under state law, the educational rights that belonged to the parent transfer to the student, unless the student has been determined to lack the ability to provide informed consent. The IEP must include a statement, starting at least one year before that birthday, telling the student which rights will transfer. This is not optional paperwork. It is required notice, and it is your cue to start the conversation early.
In Washington, the age of majority is 18 (RCW 26.28), and the transfer is governed by WAC 392-172A-05135. Importantly, transfer of rights does not mean a parent is shut out. A student who has reached 18 can choose to give a trusted adult, including a parent, decision-making authority through a Power of Attorney (RCW 11.125) without going through guardianship court at all.
Understanding SSI, SSDI, and work incentives
Many families worry that a job will cost their young adult their benefits. It is more nuanced than that. Social Security's Ticket to Work program is free and voluntary for beneficiaries ages 18 to 64, connecting them with career counseling and job placement through approved Employment Networks. Work incentives, like the Trial Work Period, let someone test employment while temporarily keeping cash benefits and health coverage (Medicare for SSDI, Medicaid for SSI).
Before your young adult starts working, a free WIPA (Work Incentive Planning and Assistance) benefits counselor can calculate exactly how a specific job or paycheck will affect their specific benefits. This is the single most useful, least-known resource in this whole process, and it costs nothing.
Guardianship is not the only option
Full guardianship, where a court gives someone else legal authority over another adult's decisions, is the most restrictive option and can be difficult to undo once granted. Many states, including Washington, now require families to consider less restrictive alternatives first. Supported decision-making lets your young adult keep their legal rights while formally naming trusted people to help them understand information and make decisions, through a written agreement that is notarized or signed by two witnesses. A Power of Attorney is another option for a student who can express a clear choice. Guardianship stays available as a last resort for situations where nothing less restrictive will work.
Get free help with any of this
Every state has a federally funded Parent Training and Information Center that helps families through exactly this process, at no cost, including help understanding transition plans and benefits. Find yours at parentcenterhub.org.