SIPP personal pension relief at source

Hello, im thinking about paying into a SIPP days before the tax year end to reduce my taxes. i know my pension provider uses the relief at source method. ive read online this could take up to 6 weeks. if i do my payment 1 week before the end of the tax year, would i be entitled for that relief if it comes back 6 weeks from that date? or that relief would carry over to the next tax year and i would not get any tax benefit in the current tax year? that is the point of making the payment into pension. thanks.

Hi,
Tax relief is due in the year the payment is made and the deemed date of payment depends on how the payment is actually made. please refer to: Deemed date of contributions
Thank you.