If that amount of deduction is warranted to bring down your taxes, you can absolutely claim your full deduction limit. Keep an eye on your refund at the top left of the menu to see if you really need to deduct it all. Otherwise you may want to carryforward your amount until you need it as per our TurboTax article: RRSPs and Your Tax Return: The Bottom Line
Carrying forward unused contribution room and undeducted contributions
Any unused contribution room will be carried forward to the next years. Similarly, any undeducted contributions will be carried forward too. This allows you to deduct from your contributions what you need to reduce your tax liability or get the maximum refund. The rest of the contributions which have no effect on your taxes can be carried forward. Also, if you suspect that you will be making more income in the next year, you can save some of your contributions and deduct them later.
Regardless of why you choose to save some of the contributions to future tax years, you have to claim the actual contribution on the tax year it was made. CRA will keep track of the undeducted portion and note it on your NOA.
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