Another Grandma chiming in, and posting to follow. Grand-twins were born on January 18. I am thinking of going the family RESP route once they get SIN's, but I need to research what happens in the unlikely case that neither one wants to go to post-secondary school.
Stasher's response is good... although you can get your original contributions (partial or fully) back before 21, too, but CESG is paid back when that happens, and no CESG matching occurs for the next 2 years as a penalty if the child is under 17.
This reply is for "what is neither one wants to go to post secondary".
see also:
https://www.canada.ca/en/services/benefits/education/education-savings/resp/use.html1. Today, there are 2052 schools that qualify as post secondary for receiving CESG (or student loans), including many international schools, and over 500 designated private schools in BC alone. Think of education such as some 6 month to 1 year trade or computer programs, digital art, appliance repair, hair stylist, language studies in another country... the only key is that the program must be at one of these 2000+ designated schools, and a minimum length in terms of weeks and hours / week (i.e., FT) attendence.
It is very likely that one of the two young relatives would end up in some sort of program that would use up some of the grant money / accumulated income money. These do not need to be full diploma / degree programs, one year trade programs work, too.
2. The RESP if unused can be transferred to a blood sibling, which is why family RESP naming multiple beneficiaries are a thing.
2b. The RESP can stay open, with tax free growth, until the RESP is 36 years old.
3a. You can close it "early" and 'unused" before the youngest is 21, if you return all grant monies and accumulated income. You keep all your original contributions.
Note, The original contributions are always considered to be the property of the contributor (owner) of the RESP, not the child, until you choose to withdraw them in their name. Note 2, that any contributions in the next 2 years won't be matched, a sort of penalty for withdrawing before the child is 17.
3b. BUT! You can keep the accumulated income earned if it is closed after the RESP is at least 10 yrs old and the youngest is 21, and you roll it over to RRSP, OR pay an extra tax on the income and keep it as cash. You always get your original contributions back, tax and penalty free.
4. If one of the beneficiaries has a registered disability, you can transfer the income in the RESP to an RDSP in their name. (Subject to the typical RDSP limits and rules, if you have one, these are the same limits).
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It's pretty hard to screw this up and not get your original contributions and the income / interest it generated back. Even the extra tax penalty on the income is roughly the amount that the government's portion (the CESG) earned, which was never your money to start with, anyway.
The largest issue is that the accumulated income in the account is locked up for at least 10 years, you lose it if you try to close out the account before the time limit is up.
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If only one recipient goes to school, for 1 term only, then it can also be hard to unlock all of the accumulated income, as there is a max of $5k to withdraw as combined CESG and accumulated income in the first term. For example, my son just withdrew $5k as CESG + Income last term (the max allowed). About $3500 of that was income and $1500 was CESG, if he quit school after 1 term only, and was the only child, then the rest of the CESG goes back to the government and I either lose all the rest of the accumulated income (it could be $10k) or I have to wait until he is 21 to take it as a roll over to RRSP or with the extra tax hit.
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As soon as one of the children goes into their 2nd term of school, you can withdraw everything remaining and close the account. The CESG must be in the child's name, but the rest can revert back to the contributor.
In my case, my son is in his 2nd term, and we will go and close out the account soon.