Spousal Allowance transfer

My wifes return has transferred 10% of her unused personal allowance to me and her return has been submitted. My return tax calculation has yet to show the benefit of that transfer. May I reduce the amount of my tax to be paid by 31st January by the £252 if by that date HMRC has still not processed that transfer.

Hi Patrick Puxley#,
Providing the transfer has been applied for correctly and there are no factors that disqualify you from receiving the transfer, your statement should update automatically to include the additional allowances.
I would advise not to adjust the amount of tax declared on your return to account for the transfer manually, as this will result in an incorrect calculation, before and after the transfer is applied.
To confirm why the transfer has not yet been applied, we would need to review your record 
Please contact us by webchat or phone here:
Self Assessment: general enquiries
We can confirm any additional information required.
Thank you.